panic: pool_do_get: shmpl free list modified: page 0xfffffd806c73c000; item addr 0xfffffd806c73c850; offset 0x40=0x6960224e Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 457905 63449 32767 0x10 0 0 syz-executor * 13559 63449 32767 0x10 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833aa380) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83975430,2,ffff80003ac02c28) at pool_do_get+0x5df pool_get(ffffffff83975430,2) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7cb0,ffff80003ac02e80,4a,ffff80003ac02dd0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7cb0,ffff80003ac02e80,ffff80003ac02dd0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80003ac02e80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac02e80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e9cb8447a0, 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 0xfffffd806c73c000; item addr 0xfffffd806c73c850; offset 0x40=0x6960224e ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833aa380) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83975430,2,ffff80003ac02c28) at pool_do_get+0x5df pool_get(ffffffff83975430,2) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7cb0,ffff80003ac02e80,4a,ffff80003ac02dd0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7cb0,ffff80003ac02e80,ffff80003ac02dd0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80003ac02e80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac02e80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e9cb8447a0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003ac02a50 rbx 0xffff8000299dee07 rdx 0xffff80000158f940 rcx 0xffff8000fffe7cb0 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa20716db731e4036 r11 0xff9c26a6284fe r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff81149635 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003ac02a40 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=13559 pid=63449 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=0xffff8000fffe6558,0xffffffff839f4b78 process=0xffff8000fffe84f0 user=0xffff80003abfd000, vmspace=0xfffffd806c905030 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40232 1744 91393 32767 2 0x10 syz-executor 63449 457905 92105 32767 7 0x10 syz-executor *63449 13559 92105 32767 7 0x4000010 syz-executor 46122 387647 1767 0 2 0x2 syz-executor 50600 148397 45889 32767 3 0x90 nanoslp syz-executor 50600 300048 45889 32767 3 0x4000090 sbwait syz-executor 50600 431261 45889 32767 3 0x4000090 fsleep syz-executor 50600 157530 45889 32767 3 0x4000090 fsleep syz-executor 92105 275298 16959 32767 3 0x90 nanoslp syz-executor 16959 87142 1767 0 3 0x82 wait syz-executor 83289 414317 77872 32767 3 0x90 nanoslp syz-executor 75092 214717 98213 32767 3 0x90 piperd syz-executor 91358 434889 86510 32767 3 0x90 wait syz-executor 45889 414380 12069 32767 3 0x90 nanoslp syz-executor 91393 317198 72962 32767 3 0x90 nanoslp syz-executor 98213 500888 1767 0 3 0x82 wait syz-executor 72962 61374 1767 0 3 0x82 wait syz-executor 12069 301649 1767 0 3 0x82 wait syz-executor 77872 305204 1767 0 3 0x82 wait syz-executor 86510 220249 1767 0 3 0x82 wait syz-executor 1767 348892 34598 0 3 0x82 nanoslp syz-executor 34598 360222 93757 0 3 0x10008a sigsusp ksh 93757 418130 26875 0 3 0x98 kqread sshd-session 26875 520161 59946 0 3 0x92 kqread sshd-session 89307 105481 1 0 3 0x100083 ttyin getty 59946 289649 1 0 3 0x88 kqread sshd 82941 206578 71389 73 3 0x1100090 kqread syslogd 71389 378074 1 0 3 0x100082 sbwait syslogd 30857 261028 1 0 3 0x100080 kqread resolvd 48390 470589 35897 77 3 0x100092 kqread dhcpleased 99804 383606 35897 77 3 0x100092 kqread dhcpleased 35897 37502 1 0 3 0x80 kqread dhcpleased 73295 482688 0 0 3 0x14200 bored smr 46379 292225 0 0 2 0x14200 zerothread 69126 149390 0 0 3 0x14200 aiodoned aiodoned 2284 390470 0 0 3 0x14200 syncer update 63617 377970 0 0 3 0x14200 cleaner cleaner 35573 92381 0 0 3 0x14200 reaper reaper 30609 276088 0 0 3 0x14200 pgdaemon pagedaemon 27436 13864 0 0 3 0x14200 bored viomb 31503 521561 0 0 3 0x40014200 acpi0 acpi0 99378 237626 0 0 3 0x40014200 idle1 69292 378211 0 0 3 0x14200 bored softnet1 72295 497026 0 0 3 0x14200 bored softnet0 51081 523652 0 0 3 0x14200 bored systqmp 30866 187876 0 0 3 0x14200 bored systq 72790 233315 0 0 3 0x14200 tmoslp softclockmp 69457 214498 0 0 3 0x40014200 tmoslp softclock 42484 513110 0 0 3 0x40014200 idle0 1 449293 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex shmpl r = 0 (0xffffffff83975448) #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:581 #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:775 #6 Xsyscall+0x128 Process 63449 (syz-executor) thread 0xffff8000fffe7cb0 (13559) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838c47c8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff83975448) #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:581 #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:775 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11046 12014K 12034K 166960K 12146 0 pcb 17 12K 12K 166960K 17 0 rtable 193 5K 7K 166960K 387 0 pf 27 16K 16K 166960K 33 0 ifaddr 34 6K 7K 166960K 48 0 ifgroup 42 1K 2K 166960K 54 0 sysctl 1 1K 9K 166960K 5 0 counters 66 36K 37K 166960K 72 0 ioctlops 0 0K 2K 166960K 32 0 iov 0 0K 16K 166960K 8 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1676 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 11 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 20 73K 121K 166960K 380 0 sigio 0 0K 0K 166960K 1 0 proc 58 99K 147K 166960K 517 0 subproc 55 3K 4K 166960K 388 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 16 0 in_multi 77 5K 7K 166960K 112 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 416 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 228 175K 191K 166960K 4275 0 UVM aobj 10 3K 4K 166960K 12 0 pinsyscall 41 82K 108K 166960K 1479 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 9 0K 2K 166960K 30 0 temp 30 8670K 8734K 166960K 5011 0 kqueue 13 20K 24K 166960K 38 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 45 0 42 1 0 1 1 0 8 0 rtentry 176 122 0 34 6 0 6 6 0 8 0 unpcb 144 86 0 68 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 45 0 41 1 0 1 1 0 8 0 arp 136 20 0 6 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 2 0 0 1 0 1 1 0 8 0 inpcb 328 203 0 196 7 0 7 7 0 8 6 nd6 152 27 0 9 1 0 1 1 0 8 0 kcovpl 48 43 0 37 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 497 0 132 29 0 29 29 0 8 5 art_table 40 498 0 132 5 0 5 5 0 8 0 art_node 32 122 0 42 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 9 0 3 1 0 1 1 0 8 0 shmpl 112 9 0 2 1 0 1 1 0 8 0 pool(0xffffffff83975430:shmpl): page inconsistency: page 0xfffffd806c73c000; 27 on list, 7 missing, 35 items per page dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1720 0 173 97 0 97 97 0 8 0 ffsino 296 1720 0 173 120 0 120 120 0 8 0 nchpl 144 2025 0 299 64 0 64 64 0 8 0 vnodes 216 2117 0 0 118 0 118 118 0 8 0 namei 1024 6374 0 6374 1 0 1 1 0 8 1 percpumem 16 51 0 3 1 0 1 1 0 8 0 kstatmem 264 26 0 6 2 0 2 2 0 8 0 scxspl 216 6919 0 6919 9 1 8 8 1 8 8 plimitpl 152 117 0 95 2 0 2 2 0 8 1 sigapl 424 598 0 550 7 0 7 7 0 8 0 knotepl 120 167 0 0 6 0 6 6 0 8 0 kqueuepl 224 46 0 37 1 0 1 1 0 8 0 pipepl 344 225 0 198 4 0 4 4 0 8 0 fdescpl 528 582 0 550 3 0 3 3 0 8 0 filepl 160 2424 0 2228 12 0 12 12 0 8 2 lockfpl 104 22 0 20 1 0 1 1 0 8 0 lockfspl 48 11 0 9 1 0 1 1 0 8 0 sessionpl 144 57 0 43 1 0 1 1 0 8 0 pgrppl 48 103 0 82 1 0 1 1 0 8 0 ucredpl 104 201 0 184 1 0 1 1 0 8 0 zombiepl 144 552 0 550 1 0 1 1 0 8 0 processpl 1232 598 0 550 5 0 5 5 0 8 0 procpl 664 732 0 680 6 0 6 6 0 8 0 sockpl 752 335 0 307 10 0 10 10 0 8 6 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 177 0 0 12 0 12 12 0 8 0 bufpl 280 2398 0 118 163 0 163 163 0 8 0 anonpl 32 7161 0 0 58 0 58 58 0 246 0 amapchunkpl 152 13322 0 12874 34 0 34 34 0 158 11 amappl16 200 2516 0 2500 18 7 11 14 0 8 8 amappl15 192 6 0 5 1 0 1 1 0 8 0 amappl14 184 5 0 5 1 1 0 1 0 8 0 amappl13 176 482 0 481 1 0 1 1 0 8 0 amappl12 168 930 0 889 3 0 3 3 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 46 0 35 1 0 1 1 0 8 0 amappl9 144 264 0 264 1 1 0 1 0 8 0 amappl8 136 17 0 16 1 0 1 1 0 8 0 amappl7 128 82 0 81 1 0 1 1 0 8 0 amappl6 120 278 0 267 1 0 1 1 0 8 0 amappl5 112 91 0 83 1 0 1 1 0 8 0 amappl4 104 387 0 364 1 0 1 1 0 8 0 amappl3 96 1888 0 1807 3 0 3 3 0 8 0 amappl2 88 699 0 627 2 0 2 2 0 8 0 amappl1 80 9916 0 9386 13 0 13 13 0 8 0 amappl 88 3507 0 3351 5 0 5 5 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 128 253 0 253 1 1 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 11 0 2 1 0 1 1 0 8 0 uaddrrnd 24 582 0 550 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 582 0 550 1 0 1 1 0 8 0 vmmpekpl 168 6838 0 6806 3 0 3 3 0 8 0 vmmpepl 168 45255 0 43450 97 0 97 97 0 357 12 vmsppl 488 581 0 550 7 1 6 6 0 8 0 rwobjpl 80 15673 0 14791 25 0 25 25 0 8 2 pdppl 4096 1172 0 1100 120 44 76 96 0 8 4 pvpl 32 15468 0 0 125 0 125 125 0 265 0 pmappl 256 581 0 550 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 293 0 47 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837bcff0) 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(ffffffff838c45c0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838c45c0) at __mp_lock+0x199 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x76f08b48bd60, count: 8 ddb{0}> trace x86_ipi_db(ffffffff837bcff0) 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(ffffffff838c45c0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838c45c0) at __mp_lock+0x199 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x76f08b48bd60, count: -7 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(ffffffff833aa380) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83975430,2,ffff80003ac02c28) at pool_do_get+0x5df pool_get(ffffffff83975430,2) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7cb0,ffff80003ac02e80,4a,ffff80003ac02dd0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7cb0,ffff80003ac02e80,ffff80003ac02dd0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80003ac02e80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac02e80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e9cb8447a0, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833aa380) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83975430,2,ffff80003ac02c28) at pool_do_get+0x5df pool_get(ffffffff83975430,2) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7cb0,ffff80003ac02e80,4a,ffff80003ac02dd0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7cb0,ffff80003ac02e80,ffff80003ac02dd0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80003ac02e80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac02e80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e9cb8447a0, count: -8