panic: pool_do_get: shmpl free list modified: page 0xfffffd806bddb000; item addr 0xfffffd806bddba18; offset 0x0=0x0 != 0xc4650b374d995c9a Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *393345 90293 0 0 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83316fc0) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398b680,1,ffff80003c978f38) at pool_do_get+0x576 pool_get(ffffffff8398b680,1) at pool_get+0x103 shmget_allocate_segment(ffff80002a800cd8,ffff80003c979190,42,ffff80003c9790e0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80002a800cd8,ffff80003c979190,ffff80003c9790e0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c979190) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeeca1fa89e0, count: 7 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: pool_do_get: shmpl free list modified: page 0xfffffd806bddb000; item addr 0xfffffd806bddba18; offset 0x0=0x0 != 0xc4650b374d995c9a ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83316fc0) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398b680,1,ffff80003c978f38) at pool_do_get+0x576 pool_get(ffffffff8398b680,1) at pool_get+0x103 shmget_allocate_segment(ffff80002a800cd8,ffff80003c979190,42,ffff80003c9790e0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80002a800cd8,ffff80003c979190,ffff80003c9790e0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c979190) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeeca1fa89e0, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003c978db0 rbx 0xc4650b374d995c9a rdx 0xffff80000144c3c0 rcx 0 rax 0xffff80002a800cd8 r8 0 r9 0x8080808080808080 r10 0x49033dd8756b2476 r11 0xc1560d9c48d20cda r12 0 r13 0xfffffd806bddba18 r14 0 r15 0x1 rip 0xffffffff82de6ce5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c978da0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=393345 pid=90293 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a800f60,0xffff80002a800a60 process=0xffff8000ffff66e8 user=0xffff80003c974000, vmspace=0xfffffd806bf9ae28 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 72374 190936 88447 0 3 0x2 biowait syz-executor 90293 412667 18429 0 2 0 syz-executor *90293 393345 18429 0 7 0x4000000 syz-executor 37251 464683 87661 60928 2 0x10 syz-executor 37251 297472 87661 60928 3 0x4000090 fsleep syz-executor 37251 59859 87661 60928 3 0x4000090 fsleep syz-executor 73265 429591 34726 0 2 0 syz-executor 73265 422141 34726 0 2 0x4000000 syz-executor 73265 338745 34726 0 3 0x4000080 fsleep syz-executor 47465 215367 93058 0 2 0 syz-executor 47465 196667 93058 0 3 0x4000080 fsleep syz-executor 47465 378990 93058 0 3 0x4000080 bell syz-executor 47465 440176 93058 0 3 0x4000080 fsleep syz-executor 3354 152139 33628 0 3 0x80 nanoslp syz-executor 3354 495540 33628 0 3 0x4000080 sbwait syz-executor 3354 217563 33628 0 3 0x4000080 fsleep syz-executor 91619 186898 0 0 3 0x14200 bored sosplice 93058 240938 88447 0 2 0x482 syz-executor 18429 7543 88447 0 2 0x482 syz-executor 17448 328309 88447 0 3 0x82 wait syz-executor 87661 52987 88447 0 3 0x82 nanoslp syz-executor 33628 324773 88447 0 3 0x82 nanoslp syz-executor 77187 390829 88447 0 3 0x82 wait syz-executor 34726 322446 88447 0 3 0x82 nanoslp syz-executor 88447 277744 73061 0 3 0x82 kqread syz-executor 73061 325366 60265 0 3 0x10008a sigsusp ksh 60265 413892 21879 0 3 0x98 kqread sshd-session 21879 111643 18148 0 3 0x92 kqread sshd-session 53335 226866 1 0 3 0x100083 ttyin getty 18148 303077 1 0 3 0x88 kqread sshd 50942 2168 42106 73 3 0x1100090 kqread syslogd 42106 351082 1 0 3 0x100082 sbwait syslogd 53826 280449 1 0 3 0x100080 kqread resolvd 32238 64063 54383 77 3 0x100092 kqread dhcpleased 40956 160871 54383 77 3 0x100092 kqread dhcpleased 54383 359967 1 0 3 0x80 kqread dhcpleased 80973 228961 0 0 3 0x14200 bored smr 99911 241076 0 0 2 0x14200 zerothread 65784 399120 0 0 3 0x14200 aiodoned aiodoned 99008 220799 0 0 3 0x14200 syncer update 47308 133627 0 0 3 0x14200 cleaner cleaner 94669 100204 0 0 3 0x14200 reaper reaper 7232 241012 0 0 3 0x14200 pgdaemon pagedaemon 40353 502374 0 0 3 0x14200 bored viomb 78069 358559 0 0 3 0x40014200 acpi0 acpi0 25414 283516 0 0 3 0x14200 bored softnet3 23633 515300 0 0 3 0x14200 bored softnet2 81606 277930 0 0 3 0x14200 bored softnet1 72897 48465 0 0 3 0x14200 bored softnet0 70087 68593 0 0 3 0x14200 bored systqmp 66945 192505 0 0 3 0x14200 bored systq 92680 438813 0 0 2 0x40014200 softclock 78857 441967 0 0 3 0x40014200 idle0 1 127677 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10226 11251K 11702K 166960K 13085 0 pcb 18 13K 14K 166960K 239 0 rtable 219 10K 10K 166960K 526 0 pf 35 14K 17K 166960K 85 0 ifaddr 39 6K 7K 166960K 66 0 ifgroup 50 2K 2K 166960K 90 0 sysctl 4 1K 1K 166960K 6 0 counters 30 17K 17K 166960K 44 0 ioctlops 0 0K 4K 166960K 178 0 iov 0 0K 20K 166960K 113 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1398 88K 88K 166960K 2500 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 6K 166960K 24 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 40 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 85K 166960K 1145 0 sigio 0 0K 0K 166960K 9 0 proc 60 59K 108K 166960K 586 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 176 0 in_multi 87 6K 7K 166960K 146 0 ether_multi 1 0K 0K 166960K 8 0 mrt 2 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 271 1208K 1208K 166960K 271 0 exec 0 0K 1K 166960K 636 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 223 73K 87K 166960K 12169 0 UVM aobj 65 5K 7K 166960K 70 0 pinsyscall 38 76K 92K 166960K 2203 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 62 0 NDP 13 0K 1K 166960K 43 0 temp 75 8636K 8713K 166960K 66139 0 kqueue 13 20K 30K 166960K 209 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 229 0 225 4 1 3 3 0 8 2 rtentry 112 156 0 63 4 0 4 4 0 8 0 unpcb 144 831 0 814 6 4 2 4 0 8 1 syncache 336 5 0 5 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 403 0 398 15 13 2 8 0 8 1 arp 88 25 0 9 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 1 0 1 1 0 1 1 0 8 1 inpcb 344 1197 0 1186 12 7 5 7 0 8 4 nd6 104 36 0 14 1 0 1 1 0 8 0 pkpcb 40 12 0 12 3 2 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1072 10 0 10 3 2 1 1 0 8 1 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pfrktable 1344 4 0 1 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 3 0 0 1 0 1 1 0 8 0 pfstkey 128 7 0 5 2 1 1 1 0 8 0 pfstate 344 4 0 2 2 1 1 1 0 8 0 pfrule 1344 7 0 3 1 0 1 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 645 0 246 29 2 27 29 0 8 2 art_table 32 649 0 246 4 0 4 4 0 8 0 art_node 16 151 0 70 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 4 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 37 0 27 1 0 1 1 0 8 0 shmpl 112 67 0 6 2 0 2 2 0 8 0 shmpl: pool(0xffffffff8398b680:shmpl): free list modified: page 0xfffffd806bddb000; item ordinal 0; addr 0xfffffd806bddba18 (p 0xfffffd806bddb000); offset 0x0=0x0 shmpl: pool(0xffffffff8398b680:shmpl): page inconsistency: page 0xfffffd806bddb000; item ordinal 1; addr 0x89a3f892323970a3 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 3628 0 2131 95 0 95 95 0 8 0 ffsino 248 3628 0 2131 95 0 95 95 0 8 0 nchpl 144 5367 0 3685 63 0 63 63 0 8 0 uvmvnodes 80 4344 0 0 89 0 89 89 0 8 0 vnodes 216 4345 0 0 242 0 242 242 0 8 0 namei 1024 18801 0 18799 3 2 1 2 0 8 0 pfiaddrpl 120 3 0 0 1 0 1 1 0 8 0 kstatmem 264 46 0 24 2 0 2 2 0 8 0 scsiplug 72 4 0 4 3 2 1 1 0 8 1 scxspl 216 19354 0 19353 17 14 3 8 1 8 2 plimitpl 152 419 0 402 1 0 1 1 0 8 0 sigapl 424 1426 0 1380 6 0 6 6 0 8 0 futexpl 64 16663 0 16657 1 0 1 1 0 8 0 knotepl 120 673045 0 672998 32 23 9 17 0 8 6 kqueuepl 184 438 0 426 4 3 1 4 0 8 0 pipepl 296 285 0 258 5 2 3 5 0 8 0 fdescpl 440 1406 0 1377 4 0 4 4 0 8 0 filepl 120 9827 0 9600 17 7 10 12 0 8 2 lockfpl 104 399 0 396 2 1 1 2 0 8 0 lockfspl 48 152 0 149 1 0 1 1 0 8 0 sessionpl 144 24 0 16 1 0 1 1 0 8 0 pgrppl 48 43 0 27 1 0 1 1 0 8 0 ucredpl 104 2291 0 2278 1 0 1 1 0 8 0 zombiepl 144 1630 0 1628 2 1 1 1 0 8 0 processpl 1104 1426 0 1380 4 0 4 4 0 8 0 procpl 648 3033 0 2977 7 1 6 6 0 8 0 sosppl 168 7 0 7 3 2 1 1 0 8 1 sockpl 528 2286 0 2254 13 6 7 7 0 8 4 mcl64k 65536 16 0 16 3 2 1 1 0 8 1 mcl16k 16384 2 0 2 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 1 0 1 0 8 0 mcl8k 8192 56 0 56 3 2 1 1 0 8 1 mcl4k 4096 3789 0 3738 17 9 8 15 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 1357 0 1345 3 1 2 2 0 8 0 mtagpl 96 75 0 15 2 0 2 2 0 8 0 mbufpl 256 15276 0 14995 83 60 23 75 0 8 5 bufpl 280 7959 0 1731 446 0 446 446 0 8 0 anonpl 24 265485 0 251948 117 10 107 114 0 187 1 amapchunkpl 152 40863 0 40288 45 15 30 32 0 158 5 amappl16 200 6377 0 5786 47 3 44 46 0 8 0 amappl15 192 25 0 25 1 1 0 1 0 8 0 amappl14 184 108 0 98 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 2033 0 2003 2 0 2 2 0 8 0 amappl11 160 43 0 33 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 270 0 270 1 1 0 1 0 8 0 amappl8 136 23 0 21 1 0 1 1 0 8 0 amappl7 128 98 0 88 1 0 1 1 0 8 0 amappl6 120 180 0 175 1 0 1 1 0 8 0 amappl5 112 125 0 118 1 0 1 1 0 8 0 amappl4 104 304 0 290 1 0 1 1 0 8 0 amappl3 96 7994 0 7883 5 1 4 4 0 8 0 amappl2 88 646 0 590 2 0 2 2 0 8 0 amappl1 80 10963 0 10448 14 2 12 13 0 8 0 amappl 88 11727 0 11552 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 256 0 256 3 2 1 1 0 8 1 dma64 64 7 0 7 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 69 0 5 2 0 2 2 0 8 0 uaddrrnd 24 1406 0 1377 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1406 0 1377 1 0 1 1 0 8 0 vmmpekpl 168 12529 0 12487 3 0 3 3 0 8 0 vmmpepl 168 93558 0 91236 133 6 127 127 0 357 16 vmsppl 360 1405 0 1377 4 1 3 4 0 8 0 rwobjpl 32 31822 0 25996 48 0 48 48 0 8 1 pdppl 4096 2819 0 2754 109 40 69 77 0 8 4 pvpl 32 672264 0 652753 227 30 197 201 0 265 19 pmappl 216 1405 0 1377 2 0 2 2 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 373 0 135 9 1 8 9 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83316fc0) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398b680,1,ffff80003c978f38) at pool_do_get+0x576 pool_get(ffffffff8398b680,1) at pool_get+0x103 shmget_allocate_segment(ffff80002a800cd8,ffff80003c979190,42,ffff80003c9790e0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80002a800cd8,ffff80003c979190,ffff80003c9790e0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c979190) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeeca1fa89e0, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff83316fc0) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398b680,1,ffff80003c978f38) at pool_do_get+0x576 pool_get(ffffffff8398b680,1) at pool_get+0x103 shmget_allocate_segment(ffff80002a800cd8,ffff80003c979190,42,ffff80003c9790e0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80002a800cd8,ffff80003c979190,ffff80003c9790e0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c979190) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeeca1fa89e0, count: -8