Fix distribution detection so that Ubuntu does not identify as Debian #1

ryao · 2012-02-28T21:29:54Z

This is meant to bring things in synchronization with the build system changes made in the corresponding zfsonlinux/spl pull request:

openzfs/spl#86

ZoL commit 1421c89 unintentionally changed the disk format in a forward- compatible, but not backward compatible way. This was accomplished by adding an entry to zbookmark_t, which is included in a couple of on-disk structures. That lead to the creation of pools with incorrect dsl_scan_phys_t objects that could only be imported by versions of ZoL containing that commit. Such pools cannot be imported by other versions of ZFS or past versions of ZoL. The additional field has been removed by the previous commit. However, affected pools must be imported and scrubbed using a version of ZoL with this commit applied. This will return the pools to a state in which they may be imported by other implementations. The 'zpool import' or 'zpool status' command can be used to determine if a pool is impacted. A message similar to one of the following means your pool must be scrubbed to restore compatibility. $ zpool import pool: zol-0.6.2-173 id: 1165955789558693437 state: ONLINE status: Errata #1 detected. action: The pool can be imported using its name or numeric identifier, however there is a compatibility issue which should be corrected by running 'zpool scrub' see: http://zfsonlinux.org/msg/ZFS-8000-ER config: ... $ zpool status pool: zol-0.6.2-173 state: ONLINE scan: pool compatibility issue detected. see: openzfs#2094 action: To correct the issue run 'zpool scrub'. config: ... If there was an async destroy in progress 'zpool import' will prevent the pool from being imported. Further advice on how to proceed will be provided by the error message as follows. $ zpool import pool: zol-0.6.2-173 id: 1165955789558693437 state: ONLINE status: Errata #2 detected. action: The pool can not be imported with this version of ZFS due to an active asynchronous destroy. Revert to an earlier version and allow the destroy to complete before updating. see: http://zfsonlinux.org/msg/ZFS-8000-ER config: ... Pools affected by the damaged dsl_scan_phys_t can be detected prior to an upgrade by running the following command as root: zdb -dddd poolname 1 | grep -P '^\t\tscan = ' | sed -e 's;scan = ;;' | wc -w Note that `poolname` must be replaced with the name of the pool you wish to check. A value of 25 indicates the dsl_scan_phys_t has been damaged. A value of 24 indicates that the dsl_scan_phys_t is normal. A value of 0 indicates that there has never been a scrub run on the pool. The regression caused by the change to zbookmark_t never made it into a tagged release, Gentoo backports, Ubuntu, Debian, Fedora, or EPEL stable respositorys. Only those using the HEAD version directly from Github after the 0.6.2 but before the 0.6.3 tag are affected. This patch does have one limitation that should be mentioned. It will not detect errata #2 on a pool unless errata #1 is also present. It expected this will not be a significant problem because pools impacted by errata #2 have a high probably of being impacted by errata #1. End users can ensure they do no hit this unlikely case by waiting for all asynchronous destroy operations to complete before updating ZoL. The presence of any background destroys on any imported pools can be checked by running `zpool get freeing` as root. This will display a non-zero value for any pool with an active asynchronous destroy. Lastly, it is expected that no user data has been lost as a result of this erratum. Original-patch-by: Tim Chase <tim@chase2k.com> Reworked-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue openzfs#2094

openzfs#180 occurred because of a race between inode eviction and zfs_zget(). openzfs/zfs@36df284 tried to address it by making an upcall to the VFS to learn whether an inode is being evicted and spin until it leaves eviction. This is a hack around the fact that we cannot ensure "SA" does immediate eviction by hooking into generic_drop_inode(), which is GPL exported and cannot be wrapped. Unfortunately, the act of calling ilookup to avoid this race during writeback creates a deadlock: [ 602.268492] INFO: task kworker/u24:6:891 blocked for more than 120 seconds. [ 602.268496] Tainted: P O 3.13.6 #1 [ 602.268498] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 602.268500] kworker/u24:6 D ffff88107fcd2e80 0 891 2 0x00000000 [ 602.268511] Workqueue: writeback bdi_writeback_workfn (flush-zfs-5) [ 602.268522] ffff8810370ff950 0000000000000002 ffff88103853d940 0000000000012e80 [ 602.268526] ffff8810370fffd8 0000000000012e80 ffff88103853d940 ffff880f5c8be098 [ 602.268530] ffff88107ffb6950 ffff8810370ff980 ffff88103a9a5b78 0000000000000000 [ 602.268534] Call Trace: [ 602.268541] [<ffffffff813dd1d4>] schedule+0x24/0x70 [ 602.268546] [<ffffffff8115fc09>] __wait_on_freeing_inode+0x99/0xc0 [ 602.268552] [<ffffffff810821c0>] ? autoremove_wake_function+0x40/0x40 [ 602.268555] [<ffffffff8115fdd8>] find_inode_fast+0x78/0xb0 [ 602.268559] [<ffffffff811608c5>] ilookup+0x65/0xd0 [ 602.268590] [<ffffffffa035c5ab>] zfs_zget+0xdb/0x260 [zfs] [ 602.268594] [<ffffffff813e013b>] ? __mutex_lock_slowpath+0x21b/0x360 [ 602.268613] [<ffffffffa03589d6>] zfs_get_data+0x46/0x340 [zfs] [ 602.268631] [<ffffffffa035fee1>] zil_add_block+0xa31/0xc00 [zfs] [ 602.268634] [<ffffffff813dfe79>] ? mutex_unlock+0x9/0x10 [ 602.268651] [<ffffffffa0360642>] zil_commit+0x12/0x20 [zfs] [ 602.268669] [<ffffffffa036a6e4>] zpl_putpage+0x174/0x840 [zfs] [ 602.268674] [<ffffffff811071ec>] do_writepages+0x1c/0x40 [ 602.268677] [<ffffffff8116df2b>] __writeback_single_inode+0x3b/0x2b0 [ 602.268680] [<ffffffff8116ecf7>] writeback_sb_inodes+0x247/0x420 [ 602.268684] [<ffffffff8116f5f3>] wb_writeback+0xe3/0x320 [ 602.268689] [<ffffffff81062cc1>] ? set_worker_desc+0x71/0x80 [ 602.268692] [<ffffffff81170b8e>] bdi_writeback_workfn+0xfe/0x490 [ 602.268696] [<ffffffff813e12b4>] ? _raw_spin_unlock_irq+0x14/0x40 [ 602.268700] [<ffffffff8106fd19>] ? finish_task_switch+0x59/0x130 [ 602.268703] [<ffffffff8106072c>] process_one_work+0x16c/0x490 [ 602.268706] [<ffffffff810613f3>] worker_thread+0x113/0x390 [ 602.268710] [<ffffffff810612e0>] ? manage_workers.isra.27+0x2a0/0x2a0 [ 602.268713] [<ffffffff81066edf>] kthread+0xdf/0x100 [ 602.268717] [<ffffffff8107877e>] ? arch_vtime_task_switch+0x8e/0xa0 [ 602.268720] [<ffffffff81066e00>] ? kthread_create_on_node+0x190/0x190 [ 602.268723] [<ffffffff813e71fc>] ret_from_fork+0x7c/0xb0 [ 602.268730] [<ffffffff81066e00>] ? kthread_create_on_node+0x190/0x190 The return value from igrab() gives us the information that ifind() provided without the risk of a deadlock. Ideally, we should ask upstream to export generic_drop_inode() so that we can wrap it to properly handle this situation, but until then, lets hook into the return value of ifind() so that we do not deadlock here. In addition, this ensures that successful exit from this function has a hold on the inode, which the code expects. Signed-off-by: Richard Yao <ryao@gentoo.org> Please enter the commit message for your changes. Lines starting

openzfs#180 occurred because of a race between inode eviction and zfs_zget(). openzfs/zfs@36df284 tried to address it by making an upcall to the VFS to learn whether an inode is being evicted and spin until it leaves eviction. This is a hack around the fact that we cannot ensure "SA" does immediate eviction by hooking into generic_drop_inode(), which is GPL exported and cannot be wrapped. Unfortunately, the act of calling ilookup to avoid this race during writeback creates a deadlock: [ 602.268492] INFO: task kworker/u24:6:891 blocked for more than 120 seconds. [ 602.268496] Tainted: P O 3.13.6 #1 [ 602.268498] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 602.268500] kworker/u24:6 D ffff88107fcd2e80 0 891 2 0x00000000 [ 602.268511] Workqueue: writeback bdi_writeback_workfn (flush-zfs-5) [ 602.268522] ffff8810370ff950 0000000000000002 ffff88103853d940 0000000000012e80 [ 602.268526] ffff8810370fffd8 0000000000012e80 ffff88103853d940 ffff880f5c8be098 [ 602.268530] ffff88107ffb6950 ffff8810370ff980 ffff88103a9a5b78 0000000000000000 [ 602.268534] Call Trace: [ 602.268541] [<ffffffff813dd1d4>] schedule+0x24/0x70 [ 602.268546] [<ffffffff8115fc09>] __wait_on_freeing_inode+0x99/0xc0 [ 602.268552] [<ffffffff810821c0>] ? autoremove_wake_function+0x40/0x40 [ 602.268555] [<ffffffff8115fdd8>] find_inode_fast+0x78/0xb0 [ 602.268559] [<ffffffff811608c5>] ilookup+0x65/0xd0 [ 602.268590] [<ffffffffa035c5ab>] zfs_zget+0xdb/0x260 [zfs] [ 602.268594] [<ffffffff813e013b>] ? __mutex_lock_slowpath+0x21b/0x360 [ 602.268613] [<ffffffffa03589d6>] zfs_get_data+0x46/0x340 [zfs] [ 602.268631] [<ffffffffa035fee1>] zil_add_block+0xa31/0xc00 [zfs] [ 602.268634] [<ffffffff813dfe79>] ? mutex_unlock+0x9/0x10 [ 602.268651] [<ffffffffa0360642>] zil_commit+0x12/0x20 [zfs] [ 602.268669] [<ffffffffa036a6e4>] zpl_putpage+0x174/0x840 [zfs] [ 602.268674] [<ffffffff811071ec>] do_writepages+0x1c/0x40 [ 602.268677] [<ffffffff8116df2b>] __writeback_single_inode+0x3b/0x2b0 [ 602.268680] [<ffffffff8116ecf7>] writeback_sb_inodes+0x247/0x420 [ 602.268684] [<ffffffff8116f5f3>] wb_writeback+0xe3/0x320 [ 602.268689] [<ffffffff81062cc1>] ? set_worker_desc+0x71/0x80 [ 602.268692] [<ffffffff81170b8e>] bdi_writeback_workfn+0xfe/0x490 [ 602.268696] [<ffffffff813e12b4>] ? _raw_spin_unlock_irq+0x14/0x40 [ 602.268700] [<ffffffff8106fd19>] ? finish_task_switch+0x59/0x130 [ 602.268703] [<ffffffff8106072c>] process_one_work+0x16c/0x490 [ 602.268706] [<ffffffff810613f3>] worker_thread+0x113/0x390 [ 602.268710] [<ffffffff810612e0>] ? manage_workers.isra.27+0x2a0/0x2a0 [ 602.268713] [<ffffffff81066edf>] kthread+0xdf/0x100 [ 602.268717] [<ffffffff8107877e>] ? arch_vtime_task_switch+0x8e/0xa0 [ 602.268720] [<ffffffff81066e00>] ? kthread_create_on_node+0x190/0x190 [ 602.268723] [<ffffffff813e71fc>] ret_from_fork+0x7c/0xb0 [ 602.268730] [<ffffffff81066e00>] ? kthread_create_on_node+0x190/0x190 The return value from igrab() gives us the information that ifind() provided without the risk of a deadlock. Ideally, we should ask upstream to export generic_drop_inode() so that we can wrap it to properly handle this situation, but until then, lets hook into the return value of ifind() so that we do not deadlock here. In addition, zfs_zget() should exit with a hold on the inode, but that was never present in the Linux port. iThis can lead to undefined behavior, such as inodes that are evicted when they have users. The function is modified to ensure that successful exit from this function has a hold on the inode, which the code expects. Signed-off-by: Richard Yao <ryao@gentoo.org> Please enter the commit message for your changes. Lines starting

openzfs#180 occurred because of a race between inode eviction and zfs_zget(). openzfs/zfs@36df284 tried to address it by making an upcall to the VFS to learn whether an inode is being evicted and spin until it leaves eviction. This is a hack around the fact that we cannot ensure "SA" does immediate eviction by hooking into generic_drop_inode(), which is GPL exported and cannot be wrapped. Unfortunately, the act of calling ilookup to avoid this race during writeback creates a deadlock: [ 602.268492] INFO: task kworker/u24:6:891 blocked for more than 120 seconds. [ 602.268496] Tainted: P O 3.13.6 #1 [ 602.268498] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 602.268500] kworker/u24:6 D ffff88107fcd2e80 0 891 2 0x00000000 [ 602.268511] Workqueue: writeback bdi_writeback_workfn (flush-zfs-5) [ 602.268522] ffff8810370ff950 0000000000000002 ffff88103853d940 0000000000012e80 [ 602.268526] ffff8810370fffd8 0000000000012e80 ffff88103853d940 ffff880f5c8be098 [ 602.268530] ffff88107ffb6950 ffff8810370ff980 ffff88103a9a5b78 0000000000000000 [ 602.268534] Call Trace: [ 602.268541] [<ffffffff813dd1d4>] schedule+0x24/0x70 [ 602.268546] [<ffffffff8115fc09>] __wait_on_freeing_inode+0x99/0xc0 [ 602.268552] [<ffffffff810821c0>] ? autoremove_wake_function+0x40/0x40 [ 602.268555] [<ffffffff8115fdd8>] find_inode_fast+0x78/0xb0 [ 602.268559] [<ffffffff811608c5>] ilookup+0x65/0xd0 [ 602.268590] [<ffffffffa035c5ab>] zfs_zget+0xdb/0x260 [zfs] [ 602.268594] [<ffffffff813e013b>] ? __mutex_lock_slowpath+0x21b/0x360 [ 602.268613] [<ffffffffa03589d6>] zfs_get_data+0x46/0x340 [zfs] [ 602.268631] [<ffffffffa035fee1>] zil_add_block+0xa31/0xc00 [zfs] [ 602.268634] [<ffffffff813dfe79>] ? mutex_unlock+0x9/0x10 [ 602.268651] [<ffffffffa0360642>] zil_commit+0x12/0x20 [zfs] [ 602.268669] [<ffffffffa036a6e4>] zpl_putpage+0x174/0x840 [zfs] [ 602.268674] [<ffffffff811071ec>] do_writepages+0x1c/0x40 [ 602.268677] [<ffffffff8116df2b>] __writeback_single_inode+0x3b/0x2b0 [ 602.268680] [<ffffffff8116ecf7>] writeback_sb_inodes+0x247/0x420 [ 602.268684] [<ffffffff8116f5f3>] wb_writeback+0xe3/0x320 [ 602.268689] [<ffffffff81062cc1>] ? set_worker_desc+0x71/0x80 [ 602.268692] [<ffffffff81170b8e>] bdi_writeback_workfn+0xfe/0x490 [ 602.268696] [<ffffffff813e12b4>] ? _raw_spin_unlock_irq+0x14/0x40 [ 602.268700] [<ffffffff8106fd19>] ? finish_task_switch+0x59/0x130 [ 602.268703] [<ffffffff8106072c>] process_one_work+0x16c/0x490 [ 602.268706] [<ffffffff810613f3>] worker_thread+0x113/0x390 [ 602.268710] [<ffffffff810612e0>] ? manage_workers.isra.27+0x2a0/0x2a0 [ 602.268713] [<ffffffff81066edf>] kthread+0xdf/0x100 [ 602.268717] [<ffffffff8107877e>] ? arch_vtime_task_switch+0x8e/0xa0 [ 602.268720] [<ffffffff81066e00>] ? kthread_create_on_node+0x190/0x190 [ 602.268723] [<ffffffff813e71fc>] ret_from_fork+0x7c/0xb0 [ 602.268730] [<ffffffff81066e00>] ? kthread_create_on_node+0x190/0x190 The return value from igrab() gives us the information that ifind() provided without the risk of a deadlock. Ideally, we should ask upstream to export generic_drop_inode() so that we can wrap it to properly handle this situation, but until then, lets hook into the return value of ifind() so that we do not deadlock here. In addition, zfs_zget() should exit with a hold on the inode, but that was never done in the Linux port when the inode had already been constructed. This can lead to undefined behavior, such as inodes that are evicted when they have users. The function is modified to ensure that successful exit from this function has a hold on the inode, which the code expects. Signed-off-by: Richard Yao <ryao@gentoo.org> Please enter the commit message for your changes. Lines starting

openzfs#180 occurred because of a race between inode eviction and zfs_zget(). openzfs/zfs@36df284 tried to address it by making a call to the VFS to learn whether an inode is being evicted. If it was being evicted the operation was retried after dropping and reacquiring the relevant resources. Unfortunately, this introduced another deadlock. INFO: task kworker/u24:6:891 blocked for more than 120 seconds. Tainted: P O 3.13.6 #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u24:6 D ffff88107fcd2e80 0 891 2 0x00000000 Workqueue: writeback bdi_writeback_workfn (flush-zfs-5) ffff8810370ff950 0000000000000002 ffff88103853d940 0000000000012e80 ffff8810370fffd8 0000000000012e80 ffff88103853d940 ffff880f5c8be098 ffff88107ffb6950 ffff8810370ff980 ffff88103a9a5b78 0000000000000000 Call Trace: [<ffffffff813dd1d4>] schedule+0x24/0x70 [<ffffffff8115fc09>] __wait_on_freeing_inode+0x99/0xc0 [<ffffffff8115fdd8>] find_inode_fast+0x78/0xb0 [<ffffffff811608c5>] ilookup+0x65/0xd0 [<ffffffffa035c5ab>] zfs_zget+0xdb/0x260 [zfs] [<ffffffffa03589d6>] zfs_get_data+0x46/0x340 [zfs] [<ffffffffa035fee1>] zil_add_block+0xa31/0xc00 [zfs] [<ffffffffa0360642>] zil_commit+0x12/0x20 [zfs] [<ffffffffa036a6e4>] zpl_putpage+0x174/0x840 [zfs] [<ffffffff811071ec>] do_writepages+0x1c/0x40 [<ffffffff8116df2b>] __writeback_single_inode+0x3b/0x2b0 [<ffffffff8116ecf7>] writeback_sb_inodes+0x247/0x420 [<ffffffff8116f5f3>] wb_writeback+0xe3/0x320 [<ffffffff81170b8e>] bdi_writeback_workfn+0xfe/0x490 [<ffffffff8106072c>] process_one_work+0x16c/0x490 [<ffffffff810613f3>] worker_thread+0x113/0x390 [<ffffffff81066edf>] kthread+0xdf/0x100 This patch implements the original fix in a slightly different manner in order to avoid both deadlocks. Instead of relying on a call to ilookup() which can block in __wait_on_freeing_inode() the return value from igrab() is used. This gives us the information that ilookup() provided without the risk of a deadlock. Alternately, this race could be closed by registering an sops->drop_inode() callback. The callback would need to detect the active SA hold thereby informing the VFS that this inode should not be evicted. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue openzfs#180

…hash mutex The following deadlock occurred on the buildbot: [ 3774.649030] VERIFY3(((*(volatile typeof((((&((zsb))->z_hold_mtx[(((z_id)) & (256 - 1))])))->m_owner) *)&((((&((zsb))->z_hold_mtx[(((z_id)) & (256 - 1))])))->m_owner))) != get_current()) failed (ffff880036362dc0 != ffff880036362dc0) [ 3774.649407] PANIC at zfs_znode.c:1108:zfs_zinactive() [ 3774.649415] Showing stack for process 32119 [ 3774.649425] CPU: 3 PID: 32119 Comm: filebench Tainted: PF O 3.11.10-100.fc18.x86_64 #1 [ 3774.649428] Hardware name: Red Hat RHEV Hypervisor, BIOS 0.5.1 01/01/2007 [ 3774.649428] ffffffffa03a3af8 ffff880047cf2bb8 ffffffff81666676 0000000000000007 [ 3774.649430] ffffffffa03a3b73 ffff880047cf2bc8 ffffffffa01c73e4 ffff880047cf2d68 [ 3774.649435] ffffffffa01c761d 0000000000000003 ffff88004b1accc0 0000000000000030 [ 3774.649447] Call Trace: [ 3774.649457] [<ffffffff81666676>] dump_stack+0x46/0x58 [ 3774.649465] [<ffffffffa01c73e4>] spl_dumpstack+0x44/0x50 [spl] [ 3774.649468] [<ffffffffa01c761d>] spl_panic+0xbd/0x100 [spl] [ 3774.649476] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649493] [<ffffffffa03369d5>] zfs_zinactive+0x1f5/0x240 [zfs] [ 3774.649538] [<ffffffffa032fb9c>] zfs_inactive+0x7c/0x430 [zfs] [ 3774.649546] [<ffffffffa03506fe>] zpl_evict_inode+0x4e/0xa0 [zfs] [ 3774.649546] [<ffffffff811c8e12>] evict+0xa2/0x1a0 [ 3774.649546] [<ffffffff811c8f4e>] dispose_list+0x3e/0x60 [ 3774.649546] [<ffffffff811c9cd1>] prune_icache_sb+0x161/0x300 [ 3774.649546] [<ffffffff811b2e35>] prune_super+0xe5/0x1b0 [ 3774.649546] [<ffffffff81153771>] shrink_slab+0x151/0x2e0 [ 3774.649546] [<ffffffff811a9809>] ? vmpressure+0x29/0x90 [ 3774.649546] [<ffffffff811a97e5>] ? vmpressure+0x5/0x90 [ 3774.649546] [<ffffffff81156979>] do_try_to_free_pages+0x3e9/0x5a0 [ 3774.649548] [<ffffffff811527ff>] ? throttle_direct_reclaim.isra.45+0x8f/0x280 [ 3774.649552] [<ffffffff81156e38>] try_to_free_pages+0xf8/0x180 [ 3774.649556] [<ffffffff8114ae3a>] __alloc_pages_nodemask+0x6aa/0xae0 [ 3774.649562] [<ffffffff81189fb8>] alloc_pages_current+0xb8/0x190 [ 3774.649565] [<ffffffff81193e30>] new_slab+0x2d0/0x3a0 [ 3774.649577] [<ffffffff81664d2d>] __slab_alloc+0x393/0x560 [ 3774.649579] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649583] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649583] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649585] [<ffffffff81195230>] kmem_cache_alloc+0x1a0/0x200 [ 3774.649589] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649594] [<ffffffffa01c1b30>] spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649596] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649599] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649624] [<ffffffffa03505c0>] ? zpl_inode_destroy+0x60/0x60 [zfs] [ 3774.649687] [<ffffffffa033266f>] zfs_inode_alloc+0x1f/0x40 [zfs] [ 3774.649687] [<ffffffffa03505da>] zpl_inode_alloc+0x1a/0x70 [zfs] [ 3774.649687] [<ffffffff811c7e16>] alloc_inode+0x26/0xa0 [ 3774.649687] [<ffffffff811c9e83>] new_inode_pseudo+0x13/0x60 [ 3774.649687] [<ffffffff811c9eed>] new_inode+0x1d/0x40 [ 3774.649710] [<ffffffffa0332ac7>] zfs_znode_alloc+0x47/0x730 [zfs] [ 3774.649770] [<ffffffffa02c8f4e>] ? sa_build_index+0xbe/0x1b0 [zfs] [ 3774.649770] [<ffffffffa02c9775>] ? sa_build_layouts+0x6b5/0xc80 [zfs] [ 3774.649770] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649794] [<ffffffffa0333b5e>] zfs_mknode+0x93e/0xe90 [zfs] [ 3774.649813] [<ffffffffa032be5b>] zfs_create+0x5db/0x780 [zfs] [ 3774.649840] [<ffffffffa0350ba5>] zpl_xattr_set_dir.isra.9+0x245/0x2a0 [zfs] [ 3774.649843] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649895] [<ffffffffa0351140>] zpl_xattr_set+0xe0/0x3f0 [zfs] [ 3774.649895] [<ffffffffa03516a4>] __zpl_xattr_security_init+0x64/0xb0 [zfs] [ 3774.649968] [<ffffffffa0351640>] ? zpl_xattr_trusted_set+0xb0/0xb0 [zfs] [ 3774.649972] [<ffffffff812a737c>] security_inode_init_security+0xbc/0xf0 [ 3774.649977] [<ffffffffa0352028>] zpl_xattr_security_init+0x18/0x20 [zfs] [ 3774.650017] [<ffffffffa0350134>] zpl_create+0x154/0x240 [zfs] [ 3774.650018] [<ffffffff811bde85>] vfs_create+0xb5/0x120 [ 3774.650018] [<ffffffff811be874>] do_last+0x984/0xe40 [ 3774.650020] [<ffffffff811baf55>] ? link_path_walk+0x255/0x880 [ 3774.650023] [<ffffffff811bedf2>] path_openat+0xc2/0x680 [ 3774.650026] [<ffffffff811bf653>] do_filp_open+0x43/0xa0 [ 3774.650030] [<ffffffff811bf615>] ? do_filp_open+0x5/0xa0 [ 3774.650034] [<ffffffff811ae7fc>] do_sys_open+0x13c/0x230 [ 3774.650037] [<ffffffff811ae912>] SyS_open+0x22/0x30 [ 3774.650040] [<ffffffff81675819>] system_call_fastpath+0x16/0x1b `zfs_mknode()` grabbed an object hash mutex via ZFS_OBJ_HOLD_ENTER(), tried to allocate a znode with zfs_znode_alloc() and entered direct reclaim, which tried to do ZFS_OBJ_HOLD_ENTER(). We can fix this by making ZFS_OBJ_HOLD_ENTER() and ZFS_OBJ_HOLD_EXIT() do calls to spl_fstrans_mark() and spl_fstrans_unmark() respectively. We can allocate a array to hold the cookies that is protected by the z_hold_mtx. Closes openzfs#3331 Signed-off-by: Richard Yao <ryao@gentoo.org>

…hash mutex The following deadlock occurred on the buildbot: [ 3774.649030] VERIFY3(((*(volatile typeof((((&((zsb))->z_hold_mtx[(((z_id)) & (256 - 1))])))->m_owner) *)&((((&((zsb))->z_hold_mtx[(((z_id)) & (256 - 1))])))->m_owner))) != get_current()) failed (ffff880036362dc0 != ffff880036362dc0) [ 3774.649407] PANIC at zfs_znode.c:1108:zfs_zinactive() [ 3774.649415] Showing stack for process 32119 [ 3774.649425] CPU: 3 PID: 32119 Comm: filebench Tainted: PF O 3.11.10-100.fc18.x86_64 #1 [ 3774.649428] Hardware name: Red Hat RHEV Hypervisor, BIOS 0.5.1 01/01/2007 [ 3774.649428] ffffffffa03a3af8 ffff880047cf2bb8 ffffffff81666676 0000000000000007 [ 3774.649430] ffffffffa03a3b73 ffff880047cf2bc8 ffffffffa01c73e4 ffff880047cf2d68 [ 3774.649435] ffffffffa01c761d 0000000000000003 ffff88004b1accc0 0000000000000030 [ 3774.649447] Call Trace: [ 3774.649457] [<ffffffff81666676>] dump_stack+0x46/0x58 [ 3774.649465] [<ffffffffa01c73e4>] spl_dumpstack+0x44/0x50 [spl] [ 3774.649468] [<ffffffffa01c761d>] spl_panic+0xbd/0x100 [spl] [ 3774.649476] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649493] [<ffffffffa03369d5>] zfs_zinactive+0x1f5/0x240 [zfs] [ 3774.649538] [<ffffffffa032fb9c>] zfs_inactive+0x7c/0x430 [zfs] [ 3774.649546] [<ffffffffa03506fe>] zpl_evict_inode+0x4e/0xa0 [zfs] [ 3774.649546] [<ffffffff811c8e12>] evict+0xa2/0x1a0 [ 3774.649546] [<ffffffff811c8f4e>] dispose_list+0x3e/0x60 [ 3774.649546] [<ffffffff811c9cd1>] prune_icache_sb+0x161/0x300 [ 3774.649546] [<ffffffff811b2e35>] prune_super+0xe5/0x1b0 [ 3774.649546] [<ffffffff81153771>] shrink_slab+0x151/0x2e0 [ 3774.649546] [<ffffffff811a9809>] ? vmpressure+0x29/0x90 [ 3774.649546] [<ffffffff811a97e5>] ? vmpressure+0x5/0x90 [ 3774.649546] [<ffffffff81156979>] do_try_to_free_pages+0x3e9/0x5a0 [ 3774.649548] [<ffffffff811527ff>] ? throttle_direct_reclaim.isra.45+0x8f/0x280 [ 3774.649552] [<ffffffff81156e38>] try_to_free_pages+0xf8/0x180 [ 3774.649556] [<ffffffff8114ae3a>] __alloc_pages_nodemask+0x6aa/0xae0 [ 3774.649562] [<ffffffff81189fb8>] alloc_pages_current+0xb8/0x190 [ 3774.649565] [<ffffffff81193e30>] new_slab+0x2d0/0x3a0 [ 3774.649577] [<ffffffff81664d2d>] __slab_alloc+0x393/0x560 [ 3774.649579] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649583] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649583] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649585] [<ffffffff81195230>] kmem_cache_alloc+0x1a0/0x200 [ 3774.649589] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649594] [<ffffffffa01c1b30>] spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649596] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649599] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649624] [<ffffffffa03505c0>] ? zpl_inode_destroy+0x60/0x60 [zfs] [ 3774.649687] [<ffffffffa033266f>] zfs_inode_alloc+0x1f/0x40 [zfs] [ 3774.649687] [<ffffffffa03505da>] zpl_inode_alloc+0x1a/0x70 [zfs] [ 3774.649687] [<ffffffff811c7e16>] alloc_inode+0x26/0xa0 [ 3774.649687] [<ffffffff811c9e83>] new_inode_pseudo+0x13/0x60 [ 3774.649687] [<ffffffff811c9eed>] new_inode+0x1d/0x40 [ 3774.649710] [<ffffffffa0332ac7>] zfs_znode_alloc+0x47/0x730 [zfs] [ 3774.649770] [<ffffffffa02c8f4e>] ? sa_build_index+0xbe/0x1b0 [zfs] [ 3774.649770] [<ffffffffa02c9775>] ? sa_build_layouts+0x6b5/0xc80 [zfs] [ 3774.649770] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649794] [<ffffffffa0333b5e>] zfs_mknode+0x93e/0xe90 [zfs] [ 3774.649813] [<ffffffffa032be5b>] zfs_create+0x5db/0x780 [zfs] [ 3774.649840] [<ffffffffa0350ba5>] zpl_xattr_set_dir.isra.9+0x245/0x2a0 [zfs] [ 3774.649843] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649895] [<ffffffffa0351140>] zpl_xattr_set+0xe0/0x3f0 [zfs] [ 3774.649895] [<ffffffffa03516a4>] __zpl_xattr_security_init+0x64/0xb0 [zfs] [ 3774.649968] [<ffffffffa0351640>] ? zpl_xattr_trusted_set+0xb0/0xb0 [zfs] [ 3774.649972] [<ffffffff812a737c>] security_inode_init_security+0xbc/0xf0 [ 3774.649977] [<ffffffffa0352028>] zpl_xattr_security_init+0x18/0x20 [zfs] [ 3774.650017] [<ffffffffa0350134>] zpl_create+0x154/0x240 [zfs] [ 3774.650018] [<ffffffff811bde85>] vfs_create+0xb5/0x120 [ 3774.650018] [<ffffffff811be874>] do_last+0x984/0xe40 [ 3774.650020] [<ffffffff811baf55>] ? link_path_walk+0x255/0x880 [ 3774.650023] [<ffffffff811bedf2>] path_openat+0xc2/0x680 [ 3774.650026] [<ffffffff811bf653>] do_filp_open+0x43/0xa0 [ 3774.650030] [<ffffffff811bf615>] ? do_filp_open+0x5/0xa0 [ 3774.650034] [<ffffffff811ae7fc>] do_sys_open+0x13c/0x230 [ 3774.650037] [<ffffffff811ae912>] SyS_open+0x22/0x30 [ 3774.650040] [<ffffffff81675819>] system_call_fastpath+0x16/0x1b `zfs_mknode()` grabbed an object hash mutex via `ZFS_OBJ_HOLD_ENTER()`, tried to allocate a znode with `zfs_znode_alloc()` and entered direct reclaim, which tried to do `ZFS_OBJ_HOLD_ENTER()`. We can fix this by making `ZFS_OBJ_HOLD_ENTER()` and ZFS_OBJ_HOLD_EXIT() do calls to `spl_fstrans_mark()` and `spl_fstrans_unmark()` respectively. We resolve this by allocating an array for each superblock to hold the cookies. Each cookie is protected by the corresponding `->z_hold_mtx`. Closes openzfs#3331 Signed-off-by: Richard Yao <ryao@gentoo.org>

…hash mutex The following deadlock occurred on the buildbot: [ 3774.649030] VERIFY3(((*(volatile typeof((((&((zsb))->z_hold_mtx[(((z_id)) & (256 - 1))])))->m_owner) *)&((((&((zsb))->z_hold_mtx[(((z_id)) & (256 - 1))])))->m_owner))) != get_current()) failed (ffff880036362dc0 != ffff880036362dc0) [ 3774.649407] PANIC at zfs_znode.c:1108:zfs_zinactive() [ 3774.649415] Showing stack for process 32119 [ 3774.649425] CPU: 3 PID: 32119 Comm: filebench Tainted: PF O 3.11.10-100.fc18.x86_64 #1 [ 3774.649428] Hardware name: Red Hat RHEV Hypervisor, BIOS 0.5.1 01/01/2007 [ 3774.649428] ffffffffa03a3af8 ffff880047cf2bb8 ffffffff81666676 0000000000000007 [ 3774.649430] ffffffffa03a3b73 ffff880047cf2bc8 ffffffffa01c73e4 ffff880047cf2d68 [ 3774.649435] ffffffffa01c761d 0000000000000003 ffff88004b1accc0 0000000000000030 [ 3774.649447] Call Trace: [ 3774.649457] [<ffffffff81666676>] dump_stack+0x46/0x58 [ 3774.649465] [<ffffffffa01c73e4>] spl_dumpstack+0x44/0x50 [spl] [ 3774.649468] [<ffffffffa01c761d>] spl_panic+0xbd/0x100 [spl] [ 3774.649476] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649493] [<ffffffffa03369d5>] zfs_zinactive+0x1f5/0x240 [zfs] [ 3774.649538] [<ffffffffa032fb9c>] zfs_inactive+0x7c/0x430 [zfs] [ 3774.649546] [<ffffffffa03506fe>] zpl_evict_inode+0x4e/0xa0 [zfs] [ 3774.649546] [<ffffffff811c8e12>] evict+0xa2/0x1a0 [ 3774.649546] [<ffffffff811c8f4e>] dispose_list+0x3e/0x60 [ 3774.649546] [<ffffffff811c9cd1>] prune_icache_sb+0x161/0x300 [ 3774.649546] [<ffffffff811b2e35>] prune_super+0xe5/0x1b0 [ 3774.649546] [<ffffffff81153771>] shrink_slab+0x151/0x2e0 [ 3774.649546] [<ffffffff811a9809>] ? vmpressure+0x29/0x90 [ 3774.649546] [<ffffffff811a97e5>] ? vmpressure+0x5/0x90 [ 3774.649546] [<ffffffff81156979>] do_try_to_free_pages+0x3e9/0x5a0 [ 3774.649548] [<ffffffff811527ff>] ? throttle_direct_reclaim.isra.45+0x8f/0x280 [ 3774.649552] [<ffffffff81156e38>] try_to_free_pages+0xf8/0x180 [ 3774.649556] [<ffffffff8114ae3a>] __alloc_pages_nodemask+0x6aa/0xae0 [ 3774.649562] [<ffffffff81189fb8>] alloc_pages_current+0xb8/0x190 [ 3774.649565] [<ffffffff81193e30>] new_slab+0x2d0/0x3a0 [ 3774.649577] [<ffffffff81664d2d>] __slab_alloc+0x393/0x560 [ 3774.649579] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649583] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649583] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649585] [<ffffffff81195230>] kmem_cache_alloc+0x1a0/0x200 [ 3774.649589] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649594] [<ffffffffa01c1b30>] spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649596] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649599] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649624] [<ffffffffa03505c0>] ? zpl_inode_destroy+0x60/0x60 [zfs] [ 3774.649687] [<ffffffffa033266f>] zfs_inode_alloc+0x1f/0x40 [zfs] [ 3774.649687] [<ffffffffa03505da>] zpl_inode_alloc+0x1a/0x70 [zfs] [ 3774.649687] [<ffffffff811c7e16>] alloc_inode+0x26/0xa0 [ 3774.649687] [<ffffffff811c9e83>] new_inode_pseudo+0x13/0x60 [ 3774.649687] [<ffffffff811c9eed>] new_inode+0x1d/0x40 [ 3774.649710] [<ffffffffa0332ac7>] zfs_znode_alloc+0x47/0x730 [zfs] [ 3774.649770] [<ffffffffa02c8f4e>] ? sa_build_index+0xbe/0x1b0 [zfs] [ 3774.649770] [<ffffffffa02c9775>] ? sa_build_layouts+0x6b5/0xc80 [zfs] [ 3774.649770] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649794] [<ffffffffa0333b5e>] zfs_mknode+0x93e/0xe90 [zfs] [ 3774.649813] [<ffffffffa032be5b>] zfs_create+0x5db/0x780 [zfs] [ 3774.649840] [<ffffffffa0350ba5>] zpl_xattr_set_dir.isra.9+0x245/0x2a0 [zfs] [ 3774.649843] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649895] [<ffffffffa0351140>] zpl_xattr_set+0xe0/0x3f0 [zfs] [ 3774.649895] [<ffffffffa03516a4>] __zpl_xattr_security_init+0x64/0xb0 [zfs] [ 3774.649968] [<ffffffffa0351640>] ? zpl_xattr_trusted_set+0xb0/0xb0 [zfs] [ 3774.649972] [<ffffffff812a737c>] security_inode_init_security+0xbc/0xf0 [ 3774.649977] [<ffffffffa0352028>] zpl_xattr_security_init+0x18/0x20 [zfs] [ 3774.650017] [<ffffffffa0350134>] zpl_create+0x154/0x240 [zfs] [ 3774.650018] [<ffffffff811bde85>] vfs_create+0xb5/0x120 [ 3774.650018] [<ffffffff811be874>] do_last+0x984/0xe40 [ 3774.650020] [<ffffffff811baf55>] ? link_path_walk+0x255/0x880 [ 3774.650023] [<ffffffff811bedf2>] path_openat+0xc2/0x680 [ 3774.650026] [<ffffffff811bf653>] do_filp_open+0x43/0xa0 [ 3774.650030] [<ffffffff811bf615>] ? do_filp_open+0x5/0xa0 [ 3774.650034] [<ffffffff811ae7fc>] do_sys_open+0x13c/0x230 [ 3774.650037] [<ffffffff811ae912>] SyS_open+0x22/0x30 [ 3774.650040] [<ffffffff81675819>] system_call_fastpath+0x16/0x1b `zfs_mknode()` grabbed an object hash mutex via `ZFS_OBJ_HOLD_ENTER()`, tried to allocate a znode with `zfs_znode_alloc()` and entered direct reclaim, which tried to do `ZFS_OBJ_HOLD_ENTER()`. This is an edge case that the kmem-rework missed. Consequently, it is a regression from 79c76d5. We can fix this by making `ZFS_OBJ_HOLD_ENTER()` and ZFS_OBJ_HOLD_EXIT() do calls to `spl_fstrans_mark()` and `spl_fstrans_unmark()` respectively. We resolve this by allocating an array for each superblock to hold the cookies. Each cookie is protected by the corresponding `->z_hold_mtx`. Closes openzfs#3331 Signed-off-by: Richard Yao <ryao@gentoo.org>

…hash mutex The following deadlock occurred on the buildbot: [ 3774.649030] VERIFY3(((*(volatile typeof((((&((zsb))->z_hold_mtx[(((z_id)) & (256 - 1))])))->m_owner) *)&((((&((zsb))->z_hold_mtx[(((z_id)) & (256 - 1))])))->m_owner))) != get_current()) failed (ffff880036362dc0 != ffff880036362dc0) [ 3774.649407] PANIC at zfs_znode.c:1108:zfs_zinactive() [ 3774.649415] Showing stack for process 32119 [ 3774.649425] CPU: 3 PID: 32119 Comm: filebench Tainted: PF O 3.11.10-100.fc18.x86_64 #1 [ 3774.649428] Hardware name: Red Hat RHEV Hypervisor, BIOS 0.5.1 01/01/2007 [ 3774.649428] ffffffffa03a3af8 ffff880047cf2bb8 ffffffff81666676 0000000000000007 [ 3774.649430] ffffffffa03a3b73 ffff880047cf2bc8 ffffffffa01c73e4 ffff880047cf2d68 [ 3774.649435] ffffffffa01c761d 0000000000000003 ffff88004b1accc0 0000000000000030 [ 3774.649447] Call Trace: [ 3774.649457] [<ffffffff81666676>] dump_stack+0x46/0x58 [ 3774.649465] [<ffffffffa01c73e4>] spl_dumpstack+0x44/0x50 [spl] [ 3774.649468] [<ffffffffa01c761d>] spl_panic+0xbd/0x100 [spl] [ 3774.649476] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649493] [<ffffffffa03369d5>] zfs_zinactive+0x1f5/0x240 [zfs] [ 3774.649538] [<ffffffffa032fb9c>] zfs_inactive+0x7c/0x430 [zfs] [ 3774.649546] [<ffffffffa03506fe>] zpl_evict_inode+0x4e/0xa0 [zfs] [ 3774.649546] [<ffffffff811c8e12>] evict+0xa2/0x1a0 [ 3774.649546] [<ffffffff811c8f4e>] dispose_list+0x3e/0x60 [ 3774.649546] [<ffffffff811c9cd1>] prune_icache_sb+0x161/0x300 [ 3774.649546] [<ffffffff811b2e35>] prune_super+0xe5/0x1b0 [ 3774.649546] [<ffffffff81153771>] shrink_slab+0x151/0x2e0 [ 3774.649546] [<ffffffff811a9809>] ? vmpressure+0x29/0x90 [ 3774.649546] [<ffffffff811a97e5>] ? vmpressure+0x5/0x90 [ 3774.649546] [<ffffffff81156979>] do_try_to_free_pages+0x3e9/0x5a0 [ 3774.649548] [<ffffffff811527ff>] ? throttle_direct_reclaim.isra.45+0x8f/0x280 [ 3774.649552] [<ffffffff81156e38>] try_to_free_pages+0xf8/0x180 [ 3774.649556] [<ffffffff8114ae3a>] __alloc_pages_nodemask+0x6aa/0xae0 [ 3774.649562] [<ffffffff81189fb8>] alloc_pages_current+0xb8/0x190 [ 3774.649565] [<ffffffff81193e30>] new_slab+0x2d0/0x3a0 [ 3774.649577] [<ffffffff81664d2d>] __slab_alloc+0x393/0x560 [ 3774.649579] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649583] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649583] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649585] [<ffffffff81195230>] kmem_cache_alloc+0x1a0/0x200 [ 3774.649589] [<ffffffffa01c1b30>] ? spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649594] [<ffffffffa01c1b30>] spl_kmem_cache_alloc+0xb0/0xee0 [spl] [ 3774.649596] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649599] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649624] [<ffffffffa03505c0>] ? zpl_inode_destroy+0x60/0x60 [zfs] [ 3774.649687] [<ffffffffa033266f>] zfs_inode_alloc+0x1f/0x40 [zfs] [ 3774.649687] [<ffffffffa03505da>] zpl_inode_alloc+0x1a/0x70 [zfs] [ 3774.649687] [<ffffffff811c7e16>] alloc_inode+0x26/0xa0 [ 3774.649687] [<ffffffff811c9e83>] new_inode_pseudo+0x13/0x60 [ 3774.649687] [<ffffffff811c9eed>] new_inode+0x1d/0x40 [ 3774.649710] [<ffffffffa0332ac7>] zfs_znode_alloc+0x47/0x730 [zfs] [ 3774.649770] [<ffffffffa02c8f4e>] ? sa_build_index+0xbe/0x1b0 [zfs] [ 3774.649770] [<ffffffffa02c9775>] ? sa_build_layouts+0x6b5/0xc80 [zfs] [ 3774.649770] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649794] [<ffffffffa0333b5e>] zfs_mknode+0x93e/0xe90 [zfs] [ 3774.649813] [<ffffffffa032be5b>] zfs_create+0x5db/0x780 [zfs] [ 3774.649840] [<ffffffffa0350ba5>] zpl_xattr_set_dir.isra.9+0x245/0x2a0 [zfs] [ 3774.649843] [<ffffffff81675440>] ? ftrace_call+0x5/0x2f [ 3774.649895] [<ffffffffa0351140>] zpl_xattr_set+0xe0/0x3f0 [zfs] [ 3774.649895] [<ffffffffa03516a4>] __zpl_xattr_security_init+0x64/0xb0 [zfs] [ 3774.649968] [<ffffffffa0351640>] ? zpl_xattr_trusted_set+0xb0/0xb0 [zfs] [ 3774.649972] [<ffffffff812a737c>] security_inode_init_security+0xbc/0xf0 [ 3774.649977] [<ffffffffa0352028>] zpl_xattr_security_init+0x18/0x20 [zfs] [ 3774.650017] [<ffffffffa0350134>] zpl_create+0x154/0x240 [zfs] [ 3774.650018] [<ffffffff811bde85>] vfs_create+0xb5/0x120 [ 3774.650018] [<ffffffff811be874>] do_last+0x984/0xe40 [ 3774.650020] [<ffffffff811baf55>] ? link_path_walk+0x255/0x880 [ 3774.650023] [<ffffffff811bedf2>] path_openat+0xc2/0x680 [ 3774.650026] [<ffffffff811bf653>] do_filp_open+0x43/0xa0 [ 3774.650030] [<ffffffff811bf615>] ? do_filp_open+0x5/0xa0 [ 3774.650034] [<ffffffff811ae7fc>] do_sys_open+0x13c/0x230 [ 3774.650037] [<ffffffff811ae912>] SyS_open+0x22/0x30 [ 3774.650040] [<ffffffff81675819>] system_call_fastpath+0x16/0x1b `zfs_mknode()` grabbed an object hash mutex via `ZFS_OBJ_HOLD_ENTER()`, tried to allocate a znode with `zfs_znode_alloc()` and entered direct reclaim, which tried to do `ZFS_OBJ_HOLD_ENTER()`. This is an edge case that the kmem-rework missed. Consequently, it is a regression from 79c76d5. We can fix this by making `ZFS_OBJ_HOLD_ENTER()` and `ZFS_OBJ_HOLD_EXIT()` do calls to `spl_fstrans_mark()` and `spl_fstrans_unmark()` respectively. We resolve this by allocating an array for each superblock to hold the cookies. Each cookie is protected by the corresponding `->z_hold_mtx`. Closes openzfs#3331 Signed-off-by: Richard Yao <ryao@gentoo.org>

The params to the functions are uint64_t, but the offsets to memcpy / bcopy are calculated using 32bit ints. This patch changes them to also be uint64_t so there isnt an overflow. PaX's Size Overflow caught this when formatting a zvol. Gentoo bug: #546490 PAX: offset: 1ffffb000 db->db_offset: 1ffffa000 db->db_size: 2000 size: 5000 PAX: size overflow detected in function dmu_read /var/tmp/portage/sys-fs/zfs-kmod-0.6.3-r1/work/zfs-zfs-0.6.3/module/zfs/../../module/zfs/dmu.c:781 cicus.366_146 max, count: 15 CPU: 1 PID: 2236 Comm: zvol/10 Tainted: P O 3.17.7-hardened-r1 #1 Call Trace: [<ffffffffa0382ee8>] ? dsl_dataset_get_holds+0x9d58/0x343ce [zfs] [<ffffffff81a59c88>] dump_stack+0x4e/0x7a [<ffffffffa0393c2a>] ? dsl_dataset_get_holds+0x1aa9a/0x343ce [zfs] [<ffffffff81206696>] report_size_overflow+0x36/0x40 [<ffffffffa02dba2b>] dmu_read+0x52b/0x920 [zfs] [<ffffffffa0373ad1>] zrl_is_locked+0x7d1/0x1ce0 [zfs] [<ffffffffa0364cd2>] zil_clean+0x9d2/0xc00 [zfs] [<ffffffffa0364f21>] zil_commit+0x21/0x30 [zfs] [<ffffffffa0373fe1>] zrl_is_locked+0xce1/0x1ce0 [zfs] [<ffffffff81a5e2c7>] ? __schedule+0x547/0xbc0 [<ffffffffa01582e6>] taskq_cancel_id+0x2a6/0x5b0 [spl] [<ffffffff81103eb0>] ? wake_up_state+0x20/0x20 [<ffffffffa0158150>] ? taskq_cancel_id+0x110/0x5b0 [spl] [<ffffffff810f7ff4>] kthread+0xc4/0xe0 [<ffffffff810f7f30>] ? kthread_create_on_node+0x170/0x170 [<ffffffff81a62fa4>] ret_from_fork+0x74/0xa0 [<ffffffff810f7f30>] ? kthread_create_on_node+0x170/0x170 Signed-off-by: Jason Zaman <jason@perfinion.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#3333

DirectIO via the O_DIRECT flag was originally introduced in XFS by IRIX for database workloads. Its purpose was to allow the database to bypass the page and buffer caches to prevent unnecessary IO operations (e.g. readahead) while preventing contention for system memory between the database and kernel caches. Unfortunately, the semantics were never defined in any standard. The semantics of O_DIRECT in XFS in Linux are as follows: 1. O_DIRECT requires IOs be aligned to backing device's sector size. 2. O_DIRECT performs unbuffered IO operations between user memory and block device (DMA when the block device is physical hardware). 3. O_DIRECT implies O_DSYNC. 4. O_DIRECT disables any locking that would serialize IO operations. The first is not possible in ZFS beause there is no backing device in the general case. The second is not possible in ZFS in the presence of compression because that prevents us from doing DMA from user pages. If we relax the requirement in the case of compression, we encunter another hurdle. In specific, avoiding the userland to kernel copy risks other userland threads modifying buffers during compression and checksum computations. For compressed data, this would cause undefined behavior while for checksums, this would imply we write incorrect checksums to disk. It would be possible to avoid those issues if we modify the page tables to make any changes by userland to memory trigger page faults and perform CoW operations. However, it is unclear if it is wise for a filesystem driver to do this. The third is doable, but we would need to make ZIL perform indirect logging to avoid writing the data twice. The fourth is already done for all IO in ZFS. Other Linux filesystems such as ext4 do not follow #3. Other platforms implement varying subsets of the XFS semantics. FreeBSD does not implement #1 and might not implement others (not checked). Mac OS X does not implement O_DIRECT, but it does implement F_NOCACHE, which is similiar to #2 in that it prevents new data from being cached. AIX relaxes #3 by only committing the file data to disk. Metadata updates required should the operations make the file larger are asynchronous unless O_DSYNC is specified. On Solaris and Illumos, there is a library function called directio(3C) that allows userspace to provide a hint to the filesystem that DirectIO is useful, but the filesystem is free to ignore it. The semantics are also entirely a filesystem decision. Those that do not implement it return ENOTTY. Given the lack of standardization and ZFS' heritage, one solution to provide compatibility with userland processes that expect DirectIO is to treat DirectIO as a hint that we ignore. This can be done trivially by implementing a shim that maps aops->direct_IO to AIO. There is also already code in ZoL for bypassing the page cache when O_DIRECT is specified, but it has been inert until now. If it turns out that it is acceptable for a filesystem driver to interact with the page tables, the scatter-gather list work will need be finished and we would need to utilize the page tables to make operations on the userland pages safe. References: http://xfs.org/docs/xfsdocs-xml-dev/XFS_User_Guide/tmp/en-US/html/ch02s09.html https://blogs.oracle.com/roch/entry/zfs_and_directio https://ext4.wiki.kernel.org/index.php/Clarifying_Direct_IO's_Semantics https://illumos.org/man/3c/directio https://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man2/fcntl.2.html https://lists.apple.com/archives/filesystem-dev/2007/Sep/msg00010.html Signed-off-by: Richard Yao <ryao@gentoo.org>

(gdb) bt \#0 0x00007f31952a35d7 in raise () from /lib64/libc.so.6 \#1 0x00007f31952a4cc8 in abort () from /lib64/libc.so.6 \#2 0x00007f319529c546 in __assert_fail_base () from /lib64/libc.so.6 \#3 0x00007f319529c5f2 in __assert_fail () from /lib64/libc.so.6 \#4 0x00007f319529c66b in __assert () from /lib64/libc.so.6 \#5 0x00007f319659e024 in send_iterate_prop (zhp=zhp@entry=0x19cf500, nv=0x19da110) at libzfs_sendrecv.c:724 \openzfs#6 0x00007f319659e35d in send_iterate_fs (zhp=zhp@entry=0x19cf500, arg=arg@entry=0x7ffc515d6380) at libzfs_sendrecv.c:762 \openzfs#7 0x00007f319659f3ca in gather_nvlist (hdl=<optimized out>, fsname=fsname@entry=0x19cf250 "tpool/test", fromsnap=fromsnap@entry=0x7ffc515d7531 "snap1", tosnap=tosnap@entry=0x7ffc515d7542 "snap2", recursive=B_FALSE, nvlp=nvlp@entry=0x7ffc515d6470, avlp=avlp@entry=0x7ffc515d6478) at libzfs_sendrecv.c:809 \openzfs#8 0x00007f31965a408f in zfs_send (zhp=zhp@entry=0x19cf240, fromsnap=fromsnap@entry=0x7ffc515d7531 "snap1", tosnap=tosnap@entry=0x7ffc515d7542 "snap2", flags=flags@entry=0x7ffc515d6d30, outfd=outfd@entry=1, filter_func=filter_func@entry=0x0, cb_arg=cb_arg@entry=0x0, debugnvp=debugnvp@entry=0x0) at libzfs_sendrecv.c:1461 \openzfs#9 0x000000000040a981 in zfs_do_send (argc=<optimized out>, argv=0x7ffc515d6ff0) at zfs_main.c:3841 \openzfs#10 0x0000000000404d10 in main (argc=6, argv=0x7ffc515d6fc8) at zfs_main.c:6724 (gdb) fr 5 \#5 0x00007f319659e024 in send_iterate_prop (zhp=zhp@entry=0x19cf500, nv=0x19da110) at libzfs_sendrecv.c:724 724 verify(nvlist_lookup_uint64(propnv, (gdb) list 719 verify(nvlist_lookup_string(propnv, 720 ZPROP_VALUE, &value) == 0); 721 VERIFY(0 == nvlist_add_string(nv, propname, value)); 722 } else { 723 uint64_t value; 724 verify(nvlist_lookup_uint64(propnv, 725 ZPROP_VALUE, &value) == 0); 726 VERIFY(0 == nvlist_add_uint64(nv, propname, value)); 727 } 728 } (gdb) p prop $1 = ZFS_PROP_RELATIME

DMU_MAX_ACCESS should be cast to a uint64_t otherwise the multiplication of DMU_MAX_ACCESS with spa_asize_inflation will be 32 bit and may lead to an overflow. Currently DMU_MAX_ACCESS is 64 * 1024 * 1024, so spa_asize_inflation being 64 or more will lead to an overflow. Found by static analysis with CoverityScan 0.8.5 CID 150942 (#1 of 1): Unintentional integer overflow (OVERFLOW_BEFORE_WIDEN) overflow_before_widen: Potentially overflowing expression 67108864 * spa_asize_inflation with type int (32 bits, signed) is evaluated using 32-bit arithmetic, and then used in a context that expects an expression of type uint64_t (64 bits, unsigned). Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#4889

Leaks reported by using AddressSanitizer, GCC 6.1.0 Direct leak of 4097 byte(s) in 1 object(s) allocated from: #1 0x414f73 in process_options cmd/ztest/ztest.c:721 Direct leak of 5440 byte(s) in 17 object(s) allocated from: #1 0x41bfd5 in umem_alloc ../../lib/libspl/include/umem.h:88 #2 0x41bfd5 in ztest_zap_parallel cmd/ztest/ztest.c:4659 #3 0x4163a8 in ztest_execute cmd/ztest/ztest.c:5907 Signed-off-by: Gvozden Neskovic <neskovic@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#4896

It is just plain unsafe to peek inside in-kernel mutex structure and make assumptions about what kernel does with those internal fields like owner. Kernel is all too happy to stop doing the expected things like tracing lock owner once you load a tainted module like spl/zfs that is not GPL. As such you will get instant assertion failures like this: VERIFY3(((*(volatile typeof((&((&zo->zo_lock)->m_mutex))->owner) *)& ((&((&zo->zo_lock)->m_mutex))->owner))) == ((void *)0)) failed (ffff88030be28500 == (null)) PANIC at zfs_onexit.c:104:zfs_onexit_destroy() Showing stack for process 3626 CPU: 0 PID: 3626 Comm: mkfs.lustre Tainted: P OE ------------ 3.10.0-debug #1 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 Call Trace: dump_stack+0x19/0x1b spl_dumpstack+0x44/0x50 [spl] spl_panic+0xbf/0xf0 [spl] zfs_onexit_destroy+0x17c/0x280 [zfs] zfsdev_release+0x48/0xd0 [zfs] Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Oleg Drokin <green@linuxhacker.ru> Closes openzfs#632 Closes openzfs#633

It is just plain unsafe to peek inside in-kernel mutex structure and make assumptions about what kernel does with those internal fields like owner. Kernel is all too happy to stop doing the expected things like tracing lock owner once you load a tainted module like spl/zfs that is not GPL. As such you will get instant assertion failures like this: VERIFY3(((*(volatile typeof((&((&zo->zo_lock)->m_mutex))->owner) *)& ((&((&zo->zo_lock)->m_mutex))->owner))) == ((void *)0)) failed (ffff88030be28500 == (null)) PANIC at zfs_onexit.c:104:zfs_onexit_destroy() Showing stack for process 3626 CPU: 0 PID: 3626 Comm: mkfs.lustre Tainted: P OE ------------ 3.10.0-debug #1 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 Call Trace: dump_stack+0x19/0x1b spl_dumpstack+0x44/0x50 [spl] spl_panic+0xbf/0xf0 [spl] zfs_onexit_destroy+0x17c/0x280 [zfs] zfsdev_release+0x48/0xd0 [zfs] Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Chunwei Chen <david.chen@osnexus.com> Reviewed-by: Gvozden Neskovic <neskovic@gmail.com> Signed-off-by: Oleg Drokin <green@linuxhacker.ru> Closes openzfs#639 Closes openzfs#632

The bug time sequence: 1. thread #1, `zfs_write` assign a txg "n". 2. In a same process, thread #2, mmap page fault (which means the `mm_sem` is hold) occurred, `zfs_dirty_inode` open a txg failed, and wait previous txg "n" completed. 3. thread #1 call `uiomove` to write, however page fault is occurred in `uiomove`, which means it need `mm_sem`, but `mm_sem` is hold by thread #2, so it stuck and can't complete, then txg "n" will not complete. So thread #1 and thread #2 are deadlocked. Reviewed-by: Chunwei Chen <tuxoko@gmail.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Signed-off-by: Grady Wong <grady.w@xtaotech.com> Closes openzfs#7939

Trying to mount a dataset from a readonly pool could inadvertently start the user accounting upgrade task, leading to the following failure: VERIFY3(tx->tx_threads == 2) failed (0 == 2) PANIC at txg.c:680:txg_wait_synced() Showing stack for process 2541 CPU: 2 PID: 2541 Comm: z_upgrade Tainted: P O 3.16.0-4-amd64 #1 Debian 3.16.51-3 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 Call Trace: [<0>] ? dump_stack+0x5d/0x78 [<0>] ? spl_panic+0xc9/0x110 [spl] [<0>] ? dnode_next_offset+0x1d4/0x2c0 [zfs] [<0>] ? dmu_object_next+0x77/0x130 [zfs] [<0>] ? dnode_rele_and_unlock+0x4d/0x120 [zfs] [<0>] ? txg_wait_synced+0x91/0x220 [zfs] [<0>] ? dmu_objset_id_quota_upgrade_cb+0x10f/0x140 [zfs] [<0>] ? dmu_objset_upgrade_task_cb+0xe3/0x170 [zfs] [<0>] ? taskq_thread+0x2cc/0x5d0 [spl] [<0>] ? wake_up_state+0x10/0x10 [<0>] ? taskq_thread_should_stop.part.3+0x70/0x70 [spl] [<0>] ? kthread+0xbd/0xe0 [<0>] ? kthread_create_on_node+0x180/0x180 [<0>] ? ret_from_fork+0x58/0x90 [<0>] ? kthread_create_on_node+0x180/0x180 This patch updates both functions responsible for checking if we can perform user accounting to verify the pool is not readonly. Reviewed-by: Alek Pinchuk <apinchuk@datto.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: loli10K <ezomori.nozomu@gmail.com> Closes openzfs#8424

While ZFS allow renaming of in use ZVOLs at the DSL level without issues the ZVOL layer does not correctly update the renamed dataset if the device node is open (zv->zv_open_count > 0): trying to access the stale dataset name, for instance during a zfs receive, will cause the following failure: VERIFY3(zv->zv_objset->os_dsl_dataset->ds_owner == zv) failed ((null) == ffff8800dbb6fc00) PANIC at zvol.c:1255:zvol_resume() Showing stack for process 1390 CPU: 0 PID: 1390 Comm: zfs Tainted: P O 3.16.0-4-amd64 #1 Debian 3.16.51-3 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 0000000000000000 ffffffff8151ea00 ffffffffa0758a80 ffff88028aefba30 ffffffffa0417219 ffff880037179220 ffffffff00000030 ffff88028aefba40 ffff88028aefb9e0 2833594649524556 6f5f767a3e2d767a 6f3e2d7465736a62 Call Trace: [<0>] ? dump_stack+0x5d/0x78 [<0>] ? spl_panic+0xc9/0x110 [spl] [<0>] ? mutex_lock+0xe/0x2a [<0>] ? zfs_refcount_remove_many+0x1ad/0x250 [zfs] [<0>] ? rrw_exit+0xc8/0x2e0 [zfs] [<0>] ? mutex_lock+0xe/0x2a [<0>] ? dmu_objset_from_ds+0x9a/0x250 [zfs] [<0>] ? dmu_objset_hold_flags+0x71/0xc0 [zfs] [<0>] ? zvol_resume+0x178/0x280 [zfs] [<0>] ? zfs_ioc_recv_impl+0x88b/0xf80 [zfs] [<0>] ? zfs_refcount_remove_many+0x1ad/0x250 [zfs] [<0>] ? zfs_ioc_recv+0x1c2/0x2a0 [zfs] [<0>] ? dmu_buf_get_user+0x13/0x20 [zfs] [<0>] ? __alloc_pages_nodemask+0x166/0xb50 [<0>] ? zfsdev_ioctl+0x896/0x9c0 [zfs] [<0>] ? handle_mm_fault+0x464/0x1140 [<0>] ? do_vfs_ioctl+0x2cf/0x4b0 [<0>] ? __do_page_fault+0x177/0x410 [<0>] ? SyS_ioctl+0x81/0xa0 [<0>] ? async_page_fault+0x28/0x30 [<0>] ? system_call_fast_compare_end+0x10/0x15 Reviewed by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: loli10K <ezomori.nozomu@gmail.com> Closes openzfs#6263 Closes openzfs#8371

Booting debug kernel found an inconsistent lock dependency between dataset's ds_lock and its directory's dd_lock. [ 32.215336] ====================================================== [ 32.221859] WARNING: possible circular locking dependency detected [ 32.221861] 4.14.90+ openzfs#8 Tainted: G O [ 32.221862] ------------------------------------------------------ [ 32.221863] dynamic_kernel_/4667 is trying to acquire lock: [ 32.221864] (&ds->ds_lock){+.+.}, at: [<ffffffffc10a4bde>] dsl_dataset_check_quota+0x9e/0x8a0 [zfs] [ 32.221941] but task is already holding lock: [ 32.221941] (&dd->dd_lock){+.+.}, at: [<ffffffffc10cd8e9>] dsl_dir_tempreserve_space+0x3b9/0x1290 [zfs] [ 32.221983] which lock already depends on the new lock. [ 32.221983] the existing dependency chain (in reverse order) is: [ 32.221984] -> #1 (&dd->dd_lock){+.+.}: [ 32.221992] __mutex_lock+0xef/0x14c0 [ 32.222049] dsl_dir_namelen+0xd4/0x2d0 [zfs] [ 32.222093] dsl_dataset_namelen+0x2f1/0x430 [zfs] [ 32.222142] verify_dataset_name_len+0xd/0x40 [zfs] [ 32.222184] dmu_objset_find_dp_impl+0x5f5/0xef0 [zfs] [ 32.222226] dmu_objset_find_dp_cb+0x40/0x60 [zfs] [ 32.222235] taskq_thread+0x969/0x1460 [spl] [ 32.222238] kthread+0x2fb/0x400 [ 32.222241] ret_from_fork+0x3a/0x50 [ 32.222241] -> #0 (&ds->ds_lock){+.+.}: [ 32.222246] lock_acquire+0x14f/0x390 [ 32.222248] __mutex_lock+0xef/0x14c0 [ 32.222291] dsl_dataset_check_quota+0x9e/0x8a0 [zfs] [ 32.222355] dsl_dir_tempreserve_space+0x5d2/0x1290 [zfs] [ 32.222392] dmu_tx_assign+0xa61/0xdb0 [zfs] [ 32.222436] zfs_create+0x4e6/0x11d0 [zfs] [ 32.222481] zpl_create+0x194/0x340 [zfs] [ 32.222484] lookup_open+0xa86/0x16f0 [ 32.222486] path_openat+0xe56/0x2490 [ 32.222488] do_filp_open+0x17f/0x260 [ 32.222490] do_sys_open+0x195/0x310 [ 32.222491] SyS_open+0xbf/0xf0 [ 32.222494] do_syscall_64+0x191/0x4f0 [ 32.222496] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.222497] other info that might help us debug this: [ 32.222497] Possible unsafe locking scenario: [ 32.222498] CPU0 CPU1 [ 32.222498] ---- ---- [ 32.222499] lock(&dd->dd_lock); [ 32.222500] lock(&ds->ds_lock); [ 32.222502] lock(&dd->dd_lock); [ 32.222503] lock(&ds->ds_lock); [ 32.222504] *** DEADLOCK *** [ 32.222505] 3 locks held by dynamic_kernel_/4667: [ 32.222506] #0: (sb_writers#9){.+.+}, at: [<ffffffffaf68933c>] mnt_want_write+0x3c/0xa0 [ 32.222511] #1: (&type->i_mutex_dir_key#8){++++}, at: [<ffffffffaf652cde>] path_openat+0xe2e/0x2490 [ 32.222515] #2: (&dd->dd_lock){+.+.}, at: [<ffffffffc10cd8e9>] dsl_dir_tempreserve_space+0x3b9/0x1290 [zfs] The issue is caused by dsl_dataset_namelen() holding ds_lock, followed by acquiring dd_lock on ds->ds_dir in dsl_dir_namelen(). However, ds->ds_dir should not be protected by ds_lock, so releasing it before call to dsl_dir_namelen() prevents the lockdep issue Reviewed-by: Alek Pinchuk <apinchuk@datto.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Chris Dunlop <chris@onthe.net.au> Signed-off-by: Michael Zhivich <mzhivich@akamai.com> Closes openzfs#8413

lockdep reports a possible recursive lock in dbuf_destroy. It is true that dbuf_destroy is acquiring the dn_dbufs_mtx on one dnode while holding it on another dnode. However, it is impossible for these to be the same dnode because, among other things,dbuf_destroy checks MUTEX_HELD before acquiring the mutex. This fix defines a class NESTED_SINGLE == 1 and changes that lock to call mutex_enter_nested with a subclass of NESTED_SINGLE. In order to make the userspace code compile, include/sys/zfs_context.h now defines mutex_enter_nested and NESTED_SINGLE. This is the lockdep report: [ 122.950921] ============================================ [ 122.950921] WARNING: possible recursive locking detected [ 122.950921] 4.19.29-4.19.0-debug-d69edad5368c1166 #1 Tainted: G O [ 122.950921] -------------------------------------------- [ 122.950921] dbu_evict/1457 is trying to acquire lock: [ 122.950921] 0000000083e9cbcf (&dn->dn_dbufs_mtx){+.+.}, at: dbuf_destroy+0x3c0/0xdb0 [zfs] [ 122.950921] but task is already holding lock: [ 122.950921] 0000000055523987 (&dn->dn_dbufs_mtx){+.+.}, at: dnode_evict_dbufs+0x90/0x740 [zfs] [ 122.950921] other info that might help us debug this: [ 122.950921] Possible unsafe locking scenario: [ 122.950921] CPU0 [ 122.950921] ---- [ 122.950921] lock(&dn->dn_dbufs_mtx); [ 122.950921] lock(&dn->dn_dbufs_mtx); [ 122.950921] *** DEADLOCK *** [ 122.950921] May be due to missing lock nesting notation [ 122.950921] 1 lock held by dbu_evict/1457: [ 122.950921] #0: 0000000055523987 (&dn->dn_dbufs_mtx){+.+.}, at: dnode_evict_dbufs+0x90/0x740 [zfs] [ 122.950921] stack backtrace: [ 122.950921] CPU: 0 PID: 1457 Comm: dbu_evict Tainted: G O 4.19.29-4.19.0-debug-d69edad5368c1166 #1 [ 122.950921] Hardware name: Supermicro H8SSL-I2/H8SSL-I2, BIOS 080011 03/13/2009 [ 122.950921] Call Trace: [ 122.950921] dump_stack+0x91/0xeb [ 122.950921] __lock_acquire+0x2ca7/0x4f10 [ 122.950921] lock_acquire+0x153/0x330 [ 122.950921] dbuf_destroy+0x3c0/0xdb0 [zfs] [ 122.950921] dbuf_evict_one+0x1cc/0x3d0 [zfs] [ 122.950921] dbuf_rele_and_unlock+0xb84/0xd60 [zfs] [ 122.950921] dnode_evict_dbufs+0x3a6/0x740 [zfs] [ 122.950921] dmu_objset_evict+0x7a/0x500 [zfs] [ 122.950921] dsl_dataset_evict_async+0x70/0x480 [zfs] [ 122.950921] taskq_thread+0x979/0x1480 [spl] [ 122.950921] kthread+0x2e7/0x3e0 [ 122.950921] ret_from_fork+0x27/0x50 Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Jeff Dike <jdike@akamai.com> Closes openzfs#8984

After spa_vdev_remove_aux() is called, the config nvlist is no longer valid, as it's been replaced by the new one (with the specified device removed). Therefore any pointers into the nvlist are no longer valid. So we can't save the result of `fnvlist_lookup_string(nv, ZPOOL_CONFIG_PATH)` (in vd_path) across the call to spa_vdev_remove_aux(). Instead, use spa_strdup() to save a copy of the string before calling spa_vdev_remove_aux. Found by AddressSanitizer: ERROR: AddressSanitizer: heap-use-after-free on address ... READ of size 34 at 0x608000a1fcd0 thread T686 #0 0x7fe88b0c166d (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x5166d) #1 0x7fe88a5acd6e in spa_strdup spa_misc.c:1447 #2 0x7fe88a688034 in spa_vdev_remove vdev_removal.c:2259 #3 0x55ffbc7748f8 in ztest_vdev_aux_add_remove ztest.c:3229 #4 0x55ffbc769fba in ztest_execute ztest.c:6714 #5 0x55ffbc779a90 in ztest_thread ztest.c:6761 openzfs#6 0x7fe889cbc6da in start_thread openzfs#7 0x7fe8899e588e in __clone 0x608000a1fcd0 is located 48 bytes inside of 88-byte region freed by thread T686 here: #0 0x7fe88b14e7b8 in __interceptor_free #1 0x7fe88ae541c5 in nvlist_free nvpair.c:874 #2 0x7fe88ae543ba in nvpair_free nvpair.c:844 #3 0x7fe88ae57400 in nvlist_remove_nvpair nvpair.c:978 #4 0x7fe88a683c81 in spa_vdev_remove_aux vdev_removal.c:185 #5 0x7fe88a68857c in spa_vdev_remove vdev_removal.c:2221 openzfs#6 0x55ffbc7748f8 in ztest_vdev_aux_add_remove ztest.c:3229 openzfs#7 0x55ffbc769fba in ztest_execute ztest.c:6714 openzfs#8 0x55ffbc779a90 in ztest_thread ztest.c:6761 openzfs#9 0x7fe889cbc6da in start_thread Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ryan Moeller <ryan@ixsystems.com> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes openzfs#9706

`zpool_do_import()` passes `argv[0]`, (optionally) `argv[1]`, and `pool_specified` to `import_pools()`. If `pool_specified==FALSE`, the `argv[]` arguments are not used. However, these values may be off the end of the `argv[]` array, so loading them could dereference unmapped memory. This error is reported by the asan build: ``` ================================================================= ==6003==ERROR: AddressSanitizer: heap-buffer-overflow READ of size 8 at 0x6030000004a8 thread T0 #0 0x562a078b50eb in zpool_do_import zpool_main.c:3796 #1 0x562a078858c5 in main zpool_main.c:10709 #2 0x7f5115231bf6 in __libc_start_main #3 0x562a07885eb9 in _start 0x6030000004a8 is located 0 bytes to the right of 24-byte region allocated by thread T0 here: #0 0x7f5116ac6b40 in __interceptor_malloc #1 0x562a07885770 in main zpool_main.c:10699 #2 0x7f5115231bf6 in __libc_start_main ``` This commit passes NULL for these arguments if they are off the end of the `argv[]` array. Reviewed-by: George Wilson <gwilson@delphix.com> Reviewed-by: John Kennedy <john.kennedy@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Allan Jude <allan@klarasystems.com> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes openzfs#12339

Before this patch, in zfs_domount, if zfs_root or d_make_root fails, we leave zfsvfs != NULL. This will lead to execution of the error handling `if` statement at the `out` label, and hence to a call to dmu_objset_disown and zfsvfs_free. However, zfs_umount, which we call upon failure of zfs_root and d_make_root already does dmu_objset_disown and zfsvfs_free. I suppose this patch rather adds to the brittleness of this part of the code base, but I don't want to invest more time in this right now. To add a regression test, we'd need some kind of fault injection facility for zfs_root or d_make_root, which doesn't exist right now. And even then, I think that regression test would be too closely tied to the implementation. To repro the double-disown / double-free, do the following: 1. patch zfs_root to always return an error 2. mount a ZFS filesystem Here's the stack trace you would see then: VERIFY3(ds->ds_owner == tag) failed (0000000000000000 == ffff9142361e8000) PANIC at dsl_dataset.c:1003:dsl_dataset_disown() Showing stack for process 28332 CPU: 2 PID: 28332 Comm: zpool Tainted: G O 5.10.103-1.nutanix.el7.x86_64 #1 Call Trace: dump_stack+0x74/0x92 spl_dumpstack+0x29/0x2b [spl] spl_panic+0xd4/0xfc [spl] dsl_dataset_disown+0xe9/0x150 [zfs] dmu_objset_disown+0xd6/0x150 [zfs] zfs_domount+0x17b/0x4b0 [zfs] zpl_mount+0x174/0x220 [zfs] legacy_get_tree+0x2b/0x50 vfs_get_tree+0x2a/0xc0 path_mount+0x2fa/0xa70 do_mount+0x7c/0xa0 __x64_sys_mount+0x8b/0xe0 do_syscall_64+0x38/0x50 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Co-authored-by: Christian Schwarz <christian.schwarz@nutanix.com> Signed-off-by: Christian Schwarz <christian.schwarz@nutanix.com> Closes openzfs#14025

Under certain loads, the following panic is hit: panic: page fault KDB: stack backtrace: #0 0xffffffff805db025 at kdb_backtrace+0x65 #1 0xffffffff8058e86f at vpanic+0x17f #2 0xffffffff8058e6e3 at panic+0x43 #3 0xffffffff808adc15 at trap_fatal+0x385 #4 0xffffffff808adc6f at trap_pfault+0x4f #5 0xffffffff80886da8 at calltrap+0x8 openzfs#6 0xffffffff80669186 at vgonel+0x186 openzfs#7 0xffffffff80669841 at vgone+0x31 openzfs#8 0xffffffff8065806d at vfs_hash_insert+0x26d openzfs#9 0xffffffff81a39069 at sfs_vgetx+0x149 openzfs#10 0xffffffff81a39c54 at zfsctl_snapdir_lookup+0x1e4 openzfs#11 0xffffffff8065a28c at lookup+0x45c openzfs#12 0xffffffff806594b9 at namei+0x259 openzfs#13 0xffffffff80676a33 at kern_statat+0xf3 openzfs#14 0xffffffff8067712f at sys_fstatat+0x2f openzfs#15 0xffffffff808ae50c at amd64_syscall+0x10c openzfs#16 0xffffffff808876bb at fast_syscall_common+0xf8 The page fault occurs because vgonel() will call VOP_CLOSE() for active vnodes. For this reason, define vop_close for zfsctl_ops_snapshot. While here, define vop_open for consistency. After adding the necessary vop, the bug progresses to the following panic: panic: VERIFY3(vrecycle(vp) == 1) failed (0 == 1) cpuid = 17 KDB: stack backtrace: #0 0xffffffff805e29c5 at kdb_backtrace+0x65 #1 0xffffffff8059620f at vpanic+0x17f #2 0xffffffff81a27f4a at spl_panic+0x3a #3 0xffffffff81a3a4d0 at zfsctl_snapshot_inactive+0x40 #4 0xffffffff8066fdee at vinactivef+0xde #5 0xffffffff80670b8a at vgonel+0x1ea openzfs#6 0xffffffff806711e1 at vgone+0x31 openzfs#7 0xffffffff8065fa0d at vfs_hash_insert+0x26d openzfs#8 0xffffffff81a39069 at sfs_vgetx+0x149 openzfs#9 0xffffffff81a39c54 at zfsctl_snapdir_lookup+0x1e4 openzfs#10 0xffffffff80661c2c at lookup+0x45c openzfs#11 0xffffffff80660e59 at namei+0x259 openzfs#12 0xffffffff8067e3d3 at kern_statat+0xf3 openzfs#13 0xffffffff8067eacf at sys_fstatat+0x2f openzfs#14 0xffffffff808b5ecc at amd64_syscall+0x10c openzfs#15 0xffffffff8088f07b at fast_syscall_common+0xf8 This is caused by a race condition that can occur when allocating a new vnode and adding that vnode to the vfs hash. If the newly created vnode loses the race when being inserted into the vfs hash, it will not be recycled as its usecount is greater than zero, hitting the above assertion. Fix this by dropping the assertion. FreeBSD-issue: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252700 Reviewed-by: Andriy Gapon <avg@FreeBSD.org> Reviewed-by: Mateusz Guzik <mjguzik@gmail.com> Reviewed-by: Alek Pinchuk <apinchuk@axcient.com> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Rob Wing <rob.wing@klarasystems.com> Co-authored-by: Rob Wing <rob.wing@klarasystems.com> Submitted-by: Klara, Inc. Sponsored-by: rsync.net Closes openzfs#14501

Fix distribution detection so that Ubuntu does not identify as Debian

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ryao merged this pull request into master Feb 28, 2012

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Fix distribution detection so that Ubuntu does not identify as Debian #1

Fix distribution detection so that Ubuntu does not identify as Debian #1

ryao commented Feb 28, 2012

Fix distribution detection so that Ubuntu does not identify as Debian #1

Fix distribution detection so that Ubuntu does not identify as Debian #1

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ryao commented Feb 28, 2012