free_mobile double free or corruption crash [May 5 01:32]

[rabidt]

running on binary built at ba3294a

syslog

May  5 01:32:00 :: Naul has quit the game.
May  5 01:32:03 :: SYSERR: Mob using '((vict)->player_specials->saved.pref)' at act.offensive.c:2362.
May  5 01:32:31 :: SYSERR: Mob using '((vict)->player_specials->saved.pref)' at act.offensive.c:2362.
May  5 01:32:44 :: WARNING: EOF on socket read (connection broken by peer)
May  5 01:32:44 :: Closing link to: Thazull.
*** Error in `bin/circle': free(): invalid pointer: 0x00007f3932231b10 ***

gdb

Program terminated with signal 6, Aborted.
#0  0x00007f393a815a98 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install MariaDB-shared-10.1.44-1.el7.centos.x86_64 bzip2-libs-1.0.6-13.el7.x86_64 expat-2.1.0-10.el7_3.x86_64 fontconfig-2.13.0-4.3.el7.x86_64 freetype-2.8-14.el7.x86_64 gd-2.0.35-26.el7.x86_64 glibc-2.22-3.fc23.x86_64 keyutils-libs-1.5.8-3.el7.x86_64 krb5-libs-1.15.1-37.el7_7.2.x86_64 libX11-1.6.7-2.el7.x86_64 libXau-1.0.8-2.1.el7.x86_64 libXpm-3.5.12-1.el7.x86_64 libcom_err-1.42.9-16.el7.x86_64 libgcc-5.1.1-4.fc23.x86_64 libjpeg-turbo-1.2.90-8.el7.x86_64 libpng-1.5.13-7.el7_2.x86_64 libselinux-2.5-14.1.el7.x86_64 libstdc++-5.1.1-4.fc23.x86_64 libuuid-2.23.2-61.el7_7.1.x86_64 libxcb-1.13-1.el7.x86_64 nss-softokn-freebl-3.44.0-8.el7_7.x86_64 openssl-libs-1.0.2k-19.el7.x86_64 pcre-8.32-17.el7.x86_64 zlib-1.2.8-9.fc23.x86_64
(gdb) bt
#0  0x00007f393a815a98 in raise () from /lib64/libc.so.6
#1  0x00007f393a81769a in abort () from /lib64/libc.so.6
#2  0x00007f393a858e1a in __libc_message () from /lib64/libc.so.6
#3  0x00007f393a86141a in _int_free () from /lib64/libc.so.6
#4  0x00007f393a864bcc in free () from /lib64/libc.so.6
#5  0x000000000062b880 in free_mobile (mob=0x7f3932231b10) at genmob.c:347
#6  0x0000000000594640 in cleanup_olc (d=d@entry=0x5b2fba20, cleanup_type=cleanup_type@entry=1 '\001') at oasis.c:127
#7  0x0000000000554d0d in close_socket (d=0x5b2fba20) at comm.c:2884
#8  0x00000000005575b7 in game_loop (local_mother_desc=3) at comm.c:945
#9  0x0000000000404a3a in init_game (local_port=<optimized out>) at comm.c:587
#10 main (argc=<optimized out>, argv=<optimized out>) at comm.c:392
(gdb) f 5
#5  0x000000000062b880 in free_mobile (mob=0x7f3932231b10) at genmob.c:347
347     genmob.c: No such file or directory.
(gdb) print mob->player.name
$1 = 0x37f7280 "fullstaff man agent"
(gdb)
(gdb) print luminari_build
$2 = 0x6f47a8 "Make time: Mon May  4 10:18:55 WEST 2020\r\nMake user: zusuk\r\nMake host: luminari.vineyard.haus\r\nBranch: * master\r\nParent: ba3294a22488d06ed74de8bef3d24e0f52a3d0ab\r\n"