panic: pool_do_get: shmpl free list modified: page 0xfffffd8061f90000; item addr 0xfffffd8061f904d0; offset 0x40=0x69d4d6a9 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 377171 32624 0 0 0 1 syz-executor *181763 4033 0 0 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83441f27) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839ee508,1,ffff8000353a1e48) at pool_do_get+0x5df pool_get(ffffffff839ee508,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffeb778,ffff8000353a20a0,45,ffff8000353a1ff0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffeb778,ffff8000353a20a0,ffff8000353a1ff0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff8000353a20a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000353a20a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c0940680f0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: pool_do_get: shmpl free list modified: page 0xfffffd8061f90000; item addr 0xfffffd8061f904d0; offset 0x40=0x69d4d6a9 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83441f27) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839ee508,1,ffff8000353a1e48) at pool_do_get+0x5df pool_get(ffffffff839ee508,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffeb778,ffff8000353a20a0,45,ffff8000353a1ff0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffeb778,ffff8000353a20a0,ffff8000353a1ff0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff8000353a20a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000353a20a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c0940680f0, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000353a1c70 rbx 0xffffffff83933e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000fffeb778 rax 0xffffffff83932ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x30c6ae9909dbb820 r11 0xac42f38340f7796c r12 0xffffffff83933c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff831693e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000353a1c60 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=181763 pid=4033 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=0xffff8000fffeba10,0xffffffff839937b8 process=0xffff8000fffef038 user=0xffff80003539d000, vmspace=0xfffffd806c8d3b88 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 32624 377171 93392 0 7 0 syz-executor 4033 425742 17705 0 2 0 syz-executor * 4033 181763 17705 0 7 0x4000000 syz-executor 74836 195107 46437 0 3 0x80 fsleep syz-executor 74836 86402 46437 0 3 0x4000080 ttyin syz-executor 29413 55314 33054 0 3 0x80 fsleep syz-executor 29413 243605 33054 0 3 0x4000080 sbwait syz-executor 75521 395646 59620 0 3 0x80 fsleep syz-executor 75521 196246 59620 0 3 0x4000080 fsleep syz-executor 75521 82812 59620 0 3 0x4000080 fsleep syz-executor 75521 503985 59620 0 3 0x4000080 lockf syz-executor 77649 373310 34751 0 3 0x80 fsleep syz-executor 77649 264550 34751 0 3 0x4000080 ttyin syz-executor 12175 94073 6337 0 3 0x80 fsleep syz-executor 12175 304827 6337 0 3 0x4000080 ttyout syz-executor 93392 298951 95168 0 3 0x82 nanoslp syz-executor 96030 86665 95168 0 3 0x2 biowait syz-executor 59620 376918 95168 0 2 0x2 syz-executor 34751 364484 95168 0 3 0x82 nanoslp syz-executor 33054 288043 95168 0 3 0x82 nanoslp syz-executor 6337 364561 95168 0 3 0x82 nanoslp syz-executor 17705 497511 95168 0 3 0x82 nanoslp syz-executor 46437 469339 95168 0 3 0x82 nanoslp syz-executor 95168 315236 15281 0 3 0x82 kqread syz-executor 15281 342488 74399 0 3 0x10008a sigsusp ksh 74399 516515 27413 0 3 0x98 kqread sshd-session 27413 399198 83920 0 3 0x92 kqread sshd-session 57914 26322 1 0 3 0x100083 ttyopn getty 83920 33639 1 0 3 0x88 kqread sshd 82685 333765 57497 74 3 0x1100092 bpf pflogd 57497 96838 1 0 3 0x80 sbwait pflogd 75919 391198 6131 73 3 0x1100090 kqread syslogd 6131 470588 1 0 3 0x100082 sbwait syslogd 91117 160053 1 0 3 0x100080 kqread resolvd 62438 404119 15409 77 3 0x100092 kqread dhcpleased 70150 197334 15409 77 3 0x100092 kqread dhcpleased 15409 247591 1 0 3 0x80 kqread dhcpleased 48423 257921 0 0 3 0x14200 bored smr 12295 491322 0 0 2 0x14200 zerothread 78878 437878 0 0 3 0x14200 aiodoned aiodoned 82542 396157 0 0 3 0x14200 syncer update 57556 306358 0 0 3 0x14200 cleaner cleaner 6511 337334 0 0 3 0x14200 reaper reaper 28530 467335 0 0 3 0x14200 pgdaemon pagedaemon 32398 239688 0 0 3 0x14200 bored viomb 61804 220012 0 0 3 0x40014200 acpi0 acpi0 79631 489634 0 0 3 0x40014200 idle1 27832 462776 0 0 3 0x14200 bored softnet1 15816 411313 0 0 3 0x14200 bored softnet0 59006 224335 0 0 3 0x14200 bored systqmp 7113 12687 0 0 3 0x14200 bored systq 74955 248776 0 0 3 0x14200 tmoslp softclockmp 31573 362074 0 0 3 0x40014200 tmoslp softclock 563 486695 0 0 3 0x40014200 idle0 1 394801 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex shmpl r = 0 (0xffffffff839ee520) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 pool_get+0x124 sys/kern/subr_pool.c:585 #3 shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 #4 sys_shmget+0x195 sys/kern/sysv_shm.c:482 #5 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 32624 (syz-executor) thread 0xffff8000fffeba10 (377171) Process 4033 (syz-executor) thread 0xffff8000fffeb778 (181763) Process 96030 (syz-executor) thread 0xffff8000ffff34d8 (86665) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11069 12097K 12502K 166960K 12671 0 pcb 17 15K 22K 166960K 146 0 rtable 190 8K 8K 166960K 388 0 pf 37 18K 82K 166960K 89 0 ifaddr 37 6K 7K 166960K 59 0 ifgroup 55 2K 2K 166960K 84 0 sysctl 1 1K 9K 166960K 7 0 counters 70 37K 37K 166960K 96 0 ioctlops 0 0K 4K 166960K 1531 0 iov 0 0K 16K 166960K 48 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1385 87K 88K 166960K 1953 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 14 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 518 0 sigio 0 0K 0K 166960K 2 0 proc 73 115K 164K 166960K 579 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 63 0 in_multi 77 5K 7K 166960K 123 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 20 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 450 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 231 167K 186K 166960K 6426 0 UVM aobj 13 2K 2K 166960K 15 0 pinsyscall 42 84K 104K 166960K 1695 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 12 0 NDP 12 0K 2K 166960K 38 0 temp 44 9080K 9164K 166960K 24255 0 kqueue 13 20K 30K 166960K 100 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 51 0 48 1 0 1 1 0 8 0 rtentry 176 114 0 36 5 0 5 5 0 8 0 unpcb 144 459 0 440 6 0 6 6 0 8 5 syncache 336 7 0 7 1 0 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpcb 736 225 0 221 10 3 7 7 0 8 6 arp 136 18 0 4 1 0 1 1 0 8 0 inpcb 328 613 0 605 12 3 9 12 0 8 8 nd6 152 25 0 6 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 9 0 9 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 4 0 1 1 0 1 1 0 8 0 pfanchor 1288 6 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 1 1 0 1 1 0 8 1 pfstitem 24 41 0 1 1 0 1 1 0 8 0 pfstkey 128 41 0 1 2 0 2 2 0 8 0 pfstate 448 41 0 1 5 0 5 5 0 8 0 pfrule 1360 29 0 21 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 517 0 191 31 4 27 31 0 8 1 art_table 40 518 0 191 5 0 5 5 0 8 0 art_node 32 114 0 44 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 3 1 0 1 1 0 8 0 semapl 112 11 0 1 1 0 1 1 0 8 0 shmpl 112 12 0 2 1 0 1 1 0 8 0 pool(0xffffffff839ee508:shmpl): page inconsistency: page 0xfffffd8061f90000; 24 on list, 10 missing, 35 items per page dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2490 0 1027 93 0 93 93 0 8 0 ffsino 296 2490 0 1027 114 0 114 114 0 8 0 nchpl 144 3186 0 1489 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 vnodes 216 2820 0 0 157 0 157 157 0 8 0 namei 1024 10367 0 10366 1 0 1 1 0 8 0 percpumem 16 63 0 13 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 48 0 20 3 0 3 3 0 8 1 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 10033 0 10032 4 3 1 3 1 8 0 plimitpl 152 134 0 115 1 0 1 1 0 8 0 sigapl 424 839 0 792 7 1 6 7 0 8 0 knotepl 120 316 0 0 10 0 10 10 0 8 0 kqueuepl 224 126 0 117 1 0 1 1 0 8 0 pipepl 344 154 0 127 3 0 3 3 0 8 0 fdescpl 528 822 0 791 3 0 3 3 0 8 0 filepl 160 5133 0 4875 18 0 18 18 0 8 7 lockfpl 104 165 0 161 1 0 1 1 0 8 0 lockfspl 48 77 0 74 1 0 1 1 0 8 0 sessionpl 144 70 0 60 1 0 1 1 0 8 0 pgrppl 48 81 0 64 1 0 1 1 0 8 0 ucredpl 104 1035 0 1022 1 0 1 1 0 8 0 zombiepl 144 792 0 792 1 0 1 1 0 8 1 processpl 1232 839 0 792 5 1 4 5 0 8 0 procpl 664 1468 0 1413 6 0 6 6 0 8 0 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 752 1170 0 1140 35 23 12 24 0 8 8 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 186 0 0 12 0 12 12 0 8 0 bufpl 280 3298 0 106 228 0 228 228 0 8 0 anonpl 32 7536 0 0 61 0 61 61 0 246 0 amapchunkpl 152 21475 0 21006 32 5 27 32 0 158 6 amappl16 200 2328 0 2295 17 7 10 15 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 430 0 429 1 0 1 1 0 8 0 amappl13 176 132 0 120 1 0 1 1 0 8 0 amappl12 168 1113 0 1083 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 65 0 51 1 0 1 1 0 8 0 amappl9 144 273 0 273 1 1 0 1 0 8 0 amappl8 136 101 0 99 1 0 1 1 0 8 0 amappl7 128 170 0 156 1 0 1 1 0 8 0 amappl6 120 159 0 156 1 0 1 1 0 8 0 amappl5 112 99 0 89 1 0 1 1 0 8 0 amappl4 104 300 0 280 1 0 1 1 0 8 0 amappl3 96 3989 0 3877 4 0 4 4 0 8 0 amappl2 88 589 0 524 2 0 2 2 0 8 0 amappl1 80 12855 0 12243 17 0 17 17 0 8 1 amappl 88 5622 0 5464 5 0 5 5 0 92 0 uvmvnodes 80 116 0 0 3 0 3 3 0 8 0 dma65536 65536 1 0 1 1 1 0 1 0 8 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 128 254 0 254 2 2 0 1 0 8 0 dma64 64 6 0 6 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 14 0 2 1 0 1 1 0 8 0 uaddrrnd 24 822 0 791 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 822 0 791 1 0 1 1 0 8 0 vmmpekpl 168 8758 0 8729 2 0 2 2 0 8 0 vmmpepl 168 61338 0 59407 101 2 99 99 0 357 6 vmsppl 488 821 0 791 5 0 5 5 0 8 0 rwobjpl 80 19741 0 18675 27 0 27 27 0 8 0 pdppl 4096 1651 0 1582 105 30 75 83 0 8 6 pvpl 32 14803 0 0 121 1 120 120 0 265 0 pmappl 256 821 0 791 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 291 0 41 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83441f27) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839ee508,1,ffff8000353a1e48) at pool_do_get+0x5df pool_get(ffffffff839ee508,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffeb778,ffff8000353a20a0,45,ffff8000353a1ff0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffeb778,ffff8000353a20a0,ffff8000353a1ff0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff8000353a20a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000353a20a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c0940680f0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299adff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839f7740) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839f7740) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003c3f7ba0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c3f7ba0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70e8a5e4f400, count: 9 ddb{1}> trace x86_ipi_db(ffff8000299adff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff839f7740) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839f7740) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003c3f7ba0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c3f7ba0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70e8a5e4f400, count: -6