panic: pool_do_get: shmpl free list modified: page 0xfffffd806c181000; item addr 0xfffffd806c1810e0; offset 0x40=0x6872d00c Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *500418 51202 -1 0x10 0x4000000 1K syz-executor 452807 47350 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833d6f4f) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398dd88,2,ffff80002a3fa458) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff8398dd88,2) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe3c60,ffff80002a3fa6b0,19f,ffff80002a3fa600) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe3c60,ffff80002a3fa6b0,ffff80002a3fa600) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a3fa6b0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3fa6b0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x51ef2dadef0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: pool_do_get: shmpl free list modified: page 0xfffffd806c181000; item addr 0xfffffd806c1810e0; offset 0x40=0x6872d00c ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833d6f4f) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398dd88,2,ffff80002a3fa458) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff8398dd88,2) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe3c60,ffff80002a3fa6b0,19f,ffff80002a3fa600) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe3c60,ffff80002a3fa6b0,ffff80002a3fa600) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a3fa6b0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3fa6b0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x51ef2dadef0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a3fa290 rbx 0xffff8000299dedd7 rdx 0xffff80000145d700 rcx 0xffff8000fffe3c60 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x2ee6a5fd3adad76a r11 0x9ccba639f12516f4 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff81fadfc5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a3fa280 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=500418 pid=51202 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe2550,0xffffffff83a18028 process=0xffff8000fffe7a40 user=0xffff80002a3f5000, vmspace=0xfffffd806bfd0980 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51202 211149 35570 -1 2 0x10 syz-executor *51202 500418 35570 -1 7 0x4000010 syz-executor 47350 452807 24024 0 7 0 syz-executor 47350 39567 24024 0 2 0x4000000 syz-executor 47350 162238 24024 0 3 0x4000080 fsleep syz-executor 79761 117448 30964 0 2 0 syz-executor 79761 516392 30964 0 3 0x4000080 sbwait syz-executor 18538 487969 29589 0 3 0x80 nanoslp syz-executor 18538 293762 29589 0 3 0x4000080 kqpoll syz-executor 18538 350908 29589 0 3 0x4000080 fsleep syz-executor 18538 206384 29589 0 3 0x4000080 fsleep syz-executor 18195 314177 63642 60929 2 0x10 syz-executor 18195 157617 63642 60929 3 0x4000090 kqpoll syz-executor 18195 130105 63642 60929 3 0x4000090 fsleep syz-executor 91836 99321 10633 0 2 0 syz-executor 91836 217968 10633 0 3 0x4000080 sbwait syz-executor 91836 278 10633 0 3 0x4000080 fsleep syz-executor 53299 242867 39362 0 3 0x3000 suspend syz-executor 53299 259034 39362 0 3 0x4081000 biowait syz-executor 14599 249765 0 0 3 0x14200 acct acct 30964 354113 4602 0 2 0x2 syz-executor 28214 36967 1 0 3 0x100083 ttyin getty 17564 129129 0 0 3 0x14200 bored sosplice 21274 327244 65505 0 3 0x100082 sbwait arp 65505 330645 91964 0 3 0x10008a sigsusp sh 35570 366477 4602 0 3 0x82 nanoslp syz-executor 39362 159962 4602 0 3 0x82 wait syz-executor 29589 226586 4602 0 3 0x82 nanoslp syz-executor 91964 487384 4602 0 3 0x82 wait syz-executor 24024 411504 4602 0 3 0x82 nanoslp syz-executor 10633 490742 4602 0 3 0x82 nanoslp syz-executor 63642 87202 4602 0 3 0x82 nanoslp syz-executor 4602 515914 4644 0 3 0x82 kqread syz-executor 4644 34818 30396 0 3 0x10008a sigsusp ksh 30396 442637 75166 0 3 0x98 kqread sshd-session 75166 153937 26032 0 3 0x92 kqread sshd-session 26032 227649 1 0 3 0x88 kqread sshd 41187 61450 42070 74 3 0x1100092 bpf pflogd 42070 116509 1 0 3 0x80 sbwait pflogd 33911 372470 84916 73 3 0x1100090 kqread syslogd 84916 409865 1 0 3 0x100082 sbwait syslogd 57388 391253 1 0 3 0x100080 kqread resolvd 87132 518799 74973 77 3 0x100092 kqread dhcpleased 47463 21273 74973 77 3 0x100092 kqread dhcpleased 74973 44087 1 0 3 0x80 kqread dhcpleased 86690 368722 0 0 3 0x14200 bored smr 70884 1556 0 0 2 0x14200 zerothread 41604 143920 0 0 3 0x14200 aiodoned aiodoned 88472 59106 0 0 3 0x14200 syncer update 40471 330755 0 0 3 0x14200 cleaner cleaner 14769 343290 0 0 3 0x14200 reaper reaper 84443 383722 0 0 3 0x14200 pgdaemon pagedaemon 25606 403541 0 0 3 0x14200 bored viomb 3455 260222 0 0 3 0x40014200 acpi0 acpi0 89601 238400 0 0 3 0x40014200 idle1 77707 380173 0 0 3 0x14200 bored softnet3 93398 473373 0 0 3 0x14200 bored softnet2 78932 306700 0 0 3 0x14200 bored softnet1 77373 183489 0 0 3 0x14200 bored softnet0 7763 193601 0 0 3 0x14200 bored systqmp 54137 319148 0 0 3 0x14200 bored systq 43703 368348 0 0 3 0x14200 tmoslp softclockmp 458 81446 0 0 3 0x40014200 tmoslp softclock 52711 283839 0 0 3 0x40014200 idle0 1 143817 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex shmpl r = 0 (0xffffffff8398dda0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pool_get+0x10b sys/kern/subr_pool.c:578 #4 shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 #5 sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 #7 Xsyscall+0x128 Process 51202 (syz-executor) thread 0xffff8000fffe3c60 (500418) Process 91836 (syz-executor) thread 0xffff8000fffeb738 (217968) Process 53299 (syz-executor) thread 0xffff8000fffebc58 (259034) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10223 11099K 11557K 166960K 12547 0 pcb 17 14K 16K 166960K 281 0 rtable 192 7K 9K 166960K 457 0 pf 37 18K 81K 166960K 146 0 ifaddr 37 6K 7K 166960K 68 0 ifgroup 60 2K 2K 166960K 102 0 sysctl 2 1K 9K 166960K 7 0 counters 70 37K 37K 166960K 106 0 ioctlops 0 0K 4K 166960K 1621 0 iov 0 0K 32K 166960K 24 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1459 92K 92K 166960K 2214 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 105 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 93K 166960K 735 0 sigio 1 0K 0K 166960K 14 0 proc 72 91K 128K 166960K 613 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 119 0 in_multi 65 5K 6K 166960K 123 0 ether_multi 1 0K 0K 166960K 6 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 415 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 253 170K 184K 166960K 8337 0 UVM aobj 20 4K 4K 166960K 24 0 pinsyscall 45 90K 109K 166960K 1859 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 42 0 NDP 13 0K 1K 166960K 43 0 temp 62 8680K 8759K 166960K 30402 0 kqueue 14 22K 30K 166960K 142 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 76 0 72 1 0 1 1 0 8 0 rtentry 176 139 0 60 5 0 5 5 0 8 0 unpcb 144 720 0 699 10 9 1 6 0 8 0 syncache 336 6 0 6 3 3 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 217 0 209 4 3 1 4 0 8 0 arp 128 21 0 8 1 0 1 1 0 8 0 inpcb 328 805 0 792 10 8 2 7 0 8 0 nd6 144 29 0 10 1 0 1 1 0 8 0 pkpcb 40 6 0 6 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 13 0 13 3 2 1 1 0 8 1 pppxif 1504 1 0 1 1 0 1 1 0 8 1 pffrag 232 5 0 0 1 0 1 1 0 482 0 pffrnode 88 5 0 0 1 0 1 1 0 8 0 pffrent 40 6 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 1 0 1 1 1 0 1 0 8 0 pfstitem 24 65 0 21 1 0 1 1 0 8 0 pfstkey 128 65 0 21 2 0 2 2 0 8 0 pfstate 384 65 0 21 6 0 6 6 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 5 0 2 4 1 3 3 0 8 0 art_heap4 256 575 0 267 31 4 27 27 0 8 2 art_table 40 580 0 269 5 0 5 5 0 8 0 art_node 32 138 0 70 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 4 1 0 1 1 0 8 0 semupl 112 3 0 3 2 1 1 1 0 8 1 semapl 112 101 0 91 1 0 1 1 0 8 0 shmpl 112 21 0 4 1 0 1 1 0 8 0 pool(0xffffffff8398dd88:shmpl): page inconsistency: page 0xfffffd806c181000; 17 on list, 17 missing, 35 items per page dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 2804 0 1303 95 0 95 95 0 8 0 ffsino 288 2804 0 1303 109 0 109 109 0 8 0 nchpl 144 3778 0 2081 63 0 63 63 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 uvmvnodes 80 3421 0 0 70 0 70 70 0 8 0 vnodes 216 3421 0 0 191 0 191 191 0 8 0 namei 1024 13387 0 13387 2 1 1 2 0 8 1 percpumem 16 68 0 18 1 0 1 1 0 8 0 kstatmem 264 58 0 28 4 1 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 2 0 2 2 1 1 1 0 8 1 scxspl 216 23838 0 23837 10 5 5 8 1 8 4 plimitpl 152 220 0 201 1 0 1 1 0 8 0 sigapl 424 1041 0 988 8 2 6 7 0 8 0 knotepl 120 467 0 0 15 0 15 15 0 8 0 kqueuepl 224 225 0 214 3 1 2 2 0 8 1 pipepl 336 181 0 153 5 0 5 5 0 8 2 fdescpl 520 1020 0 987 3 0 3 3 0 8 0 filepl 160 6398 0 6166 25 11 14 18 0 8 4 lockfpl 104 739 0 734 5 3 2 4 0 8 1 lockfspl 48 287 0 282 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 51 0 34 1 0 1 1 0 8 0 ucredpl 104 977 0 961 1 0 1 1 0 8 0 zombiepl 144 989 0 988 1 0 1 1 0 8 0 processpl 1240 1041 0 988 5 0 5 5 0 8 0 procpl 656 2136 0 2071 7 1 6 6 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 728 1629 0 1591 23 15 8 16 0 8 4 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 69 0 0 9 1 8 9 0 8 0 mtagpl 96 92 0 0 3 0 3 3 0 8 0 mbufpl 256 233 0 0 14 0 14 14 0 8 0 bufpl 280 9598 0 3456 439 0 439 439 0 8 0 anonpl 32 12090 0 0 98 0 98 98 0 246 0 amapchunkpl 152 26718 0 26190 31 6 25 28 0 158 4 amappl16 200 4224 0 4068 45 31 14 28 0 8 5 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl14 184 119 0 105 1 0 1 1 0 8 0 amappl13 176 14 0 14 1 1 0 1 0 8 0 amappl12 168 1680 0 1646 3 1 2 2 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 7 0 5 1 0 1 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 27 0 25 1 0 1 1 0 8 0 amappl7 128 135 0 120 1 0 1 1 0 8 0 amappl6 120 183 0 178 1 0 1 1 0 8 0 amappl5 112 130 0 120 1 0 1 1 0 8 0 amappl4 104 335 0 313 1 0 1 1 0 8 0 amappl3 96 5409 0 5290 4 0 4 4 0 8 0 amappl2 88 665 0 598 2 0 2 2 0 8 0 amappl1 80 11559 0 10924 15 0 15 15 0 8 0 amappl 88 7516 0 7342 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 128 254 0 254 2 1 1 1 0 8 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 23 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1020 0 987 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1020 0 987 1 0 1 1 0 8 0 vmmpekpl 168 9997 0 9956 3 0 3 3 0 8 0 vmmpepl 168 71612 0 69378 116 7 109 113 0 357 8 vmsppl 480 1019 0 987 5 0 5 5 0 8 0 rwobjpl 72 25228 0 20667 83 0 83 83 0 8 0 pdppl 4096 2047 0 1974 109 36 73 85 0 8 0 pvpl 32 21026 0 0 171 1 170 171 0 265 0 pmappl 256 1019 0 987 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 412 0 51 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83893ff0) 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(ffffffff83940d88) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83940d88) at __mp_lock+0x199 sys/kern/kern_lock.c:165 intr_handler(ffff80002a41ea60,ffff800000079a80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x75d3b83db3b0, count: 9 ddb{0}> trace x86_ipi_db(ffffffff83893ff0) 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(ffffffff83940d88) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83940d88) at __mp_lock+0x199 sys/kern/kern_lock.c:165 intr_handler(ffff80002a41ea60,ffff800000079a80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x75d3b83db3b0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833d6f4f) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398dd88,2,ffff80002a3fa458) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff8398dd88,2) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe3c60,ffff80002a3fa6b0,19f,ffff80002a3fa600) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe3c60,ffff80002a3fa6b0,ffff80002a3fa600) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a3fa6b0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3fa6b0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x51ef2dadef0, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833d6f4f) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398dd88,2,ffff80002a3fa458) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff8398dd88,2) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe3c60,ffff80002a3fa6b0,19f,ffff80002a3fa600) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe3c60,ffff80002a3fa6b0,ffff80002a3fa600) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a3fa6b0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3fa6b0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x51ef2dadef0, count: -8