panic: pool_do_get: shmpl free list modified: page 0xfffffd800f7bd000; item addr 0xfffffd800f7bda10; offset 0x40=0x69641797 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 95595 84881 32767 0x10 0 1 syz-executor *156018 84881 32767 0x10 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833a8d78) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838ebf28,1,ffff80002f3c2c98) at pool_do_get+0x5df pool_get(ffffffff838ebf28,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7ca8,ffff80002f3c2ef0,186,ffff80002f3c2e40) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7ca8,ffff80002f3c2ef0,ffff80002f3c2e40) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f3c2ef0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f3c2ef0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7643379ba30, 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 0xfffffd800f7bd000; item addr 0xfffffd800f7bda10; offset 0x40=0x69641797 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833a8d78) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838ebf28,1,ffff80002f3c2c98) at pool_do_get+0x5df pool_get(ffffffff838ebf28,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7ca8,ffff80002f3c2ef0,186,ffff80002f3c2e40) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7ca8,ffff80002f3c2ef0,ffff80002f3c2e40) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f3c2ef0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f3c2ef0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7643379ba30, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002f3c2ac0 rbx 0xffffffff83898e07 cpu_info_full_primary+0x2e07 rdx 0xffff800001545740 rcx 0xffff8000fffe7ca8 rax 0xffffffff83897ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x35708d7c5384c90f r11 0xec84d9274bce1256 r12 0xffffffff83898c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff82c20615 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002f3c2ab0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=156018 pid=84881 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=0xffff8000fffe6fb0,0xffffffff8392fbc8 process=0xffff8000fffe1d00 user=0xffff80002f3bd000, vmspace=0xfffffd800eb9bd80 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 56904 330948 86059 0 2 0 syz-executor 84881 95595 36698 32767 7 0x10 syz-executor *84881 156018 36698 32767 7 0x4000010 syz-executor 86059 419340 99311 0 2 0x2 syz-executor 38610 249424 99311 0 2 0x2 syz-executor 18625 389415 73401 32767 3 0x90 nanoslp syz-executor 18625 46128 73401 32767 2 0x4000010 syz-executor 18625 469898 73401 32767 3 0x4000090 fsleep syz-executor 50805 212880 62324 0 2 0x2 sshd-session 6236 243170 96094 32767 2 0x10 syz-executor 6236 413249 96094 32767 3 0x4000090 fsleep syz-executor 6236 160724 96094 32767 3 0x4000090 fsleep syz-executor 48240 448898 12050 32767 3 0x90 nanoslp syz-executor 48240 110941 12050 32767 3 0x4000090 lockf syz-executor 48240 141647 12050 32767 3 0x4000090 fsleep syz-executor 77595 320700 18983 32767 2 0x10 syz-executor 96094 356367 76584 32767 3 0x90 nanoslp syz-executor 12050 163867 5341 32767 3 0x90 nanoslp syz-executor 95415 352377 13820 32767 2 0x10000010 syz-executor 73401 268124 79917 32767 3 0x90 nanoslp syz-executor 36698 72087 97609 32767 3 0x90 nanoslp syz-executor 76584 482516 99311 0 3 0x82 wait syz-executor 18983 79393 99311 0 3 0x82 wait syz-executor 13820 297586 99311 0 3 0x82 wait syz-executor 5341 39151 99311 0 3 0x82 wait syz-executor 79917 321172 99311 0 3 0x82 wait syz-executor 97609 243573 99311 0 3 0x82 wait syz-executor 99311 2405 41213 0 3 0x82 kqread syz-executor 41213 367892 84590 0 3 0x10008a sigsusp ksh 84590 408902 49504 0 3 0x98 kqread sshd-session 49504 307735 62324 0 3 0x92 kqread sshd-session 40016 183247 1 0 3 0x100083 ttyin getty 62324 229126 1 0 3 0x88 kqread sshd 9245 98575 92616 73 3 0x1100090 kqread syslogd 92616 338154 1 0 3 0x100082 sbwait syslogd 98930 508524 1 0 3 0x100080 kqread resolvd 19746 517735 58912 77 3 0x100092 kqread dhcpleased 70031 24941 58912 77 3 0x100092 kqread dhcpleased 58912 55844 1 0 3 0x80 kqread dhcpleased 45418 190646 0 0 3 0x14200 bored smr 54400 147397 0 0 2 0x14200 zerothread 61053 518076 0 0 3 0x14200 aiodoned aiodoned 61521 345989 0 0 3 0x14200 syncer update 30582 344624 0 0 3 0x14200 cleaner cleaner 12062 102586 0 0 3 0x14200 reaper reaper 85128 449097 0 0 3 0x14200 pgdaemon pagedaemon 79697 95075 0 0 3 0x14200 bored viomb 64251 202705 0 0 3 0x40014200 acpi0 acpi0 81400 198924 0 0 3 0x40014200 idle1 50332 137787 0 0 3 0x14200 bored softnet1 62728 270395 0 0 3 0x14200 bored softnet0 68000 323464 0 0 3 0x14200 smrbar systqmp 28749 29335 0 0 3 0x14200 bored systq 11993 23465 0 0 3 0x14200 tmoslp softclockmp 54600 321904 0 0 3 0x40014200 tmoslp softclock 5434 72202 0 0 3 0x40014200 idle0 1 503653 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex shmpl r = 0 (0xffffffff838ebf40) #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 84881 (syz-executor) thread 0xffff8000fffe7ca8 (156018) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839d5088) #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 (0xffffffff838ebf40) #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 68000 (systqmp) thread 0xffff8000ffffe530 (323464) shared rwlock systqmp r = 0 (0xffffffff838a7fa8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11046 12014K 12034K 166960K 12143 0 pcb 17 12K 12K 166960K 17 0 rtable 199 5K 7K 166960K 356 0 pf 27 16K 16K 166960K 31 0 ifaddr 34 6K 7K 166960K 44 0 ifgroup 42 1K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 6 0 counters 66 36K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 29 0 iov 0 0K 12K 166960K 44 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1452 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 1K 1K 166960K 20 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 22 81K 129K 166960K 326 0 sigio 0 0K 0K 166960K 2 0 proc 58 99K 147K 166960K 509 0 subproc 71 4K 4K 166960K 161 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 20 0 in_multi 77 5K 7K 166960K 106 0 ether_multi 1 0K 0K 166960K 3 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 382 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 240 175K 177K 166960K 4380 0 UVM aobj 8 2K 3K 166960K 10 0 pinsyscall 45 90K 113K 166960K 1379 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 18 0 NDP 9 0K 2K 166960K 27 0 temp 34 8670K 8736K 166960K 4789 0 kqueue 14 22K 29K 166960K 48 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 75 0 72 2 0 2 2 0 8 1 rtentry 176 114 0 23 6 0 6 6 0 8 0 unpcb 144 300 0 279 6 0 6 6 0 8 4 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpqe 32 3 0 3 1 0 1 1 0 8 1 tcpcb 736 134 0 124 7 0 7 7 0 8 5 arp 136 19 0 4 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 328 332 0 318 7 0 7 7 0 8 5 nd6 152 26 0 6 1 0 1 1 0 8 0 kcovpl 48 17 0 10 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 457 0 88 29 0 29 29 0 8 1 art_table 40 458 0 88 5 0 5 5 0 8 0 art_node 32 114 0 22 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 7 0 2 1 0 1 1 0 8 0 pool(0xffffffff838ebf28:shmpl): page inconsistency: page 0xfffffd800f7bd000; 29 on list, 5 missing, 35 items per page dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1776 0 257 95 0 95 95 0 8 0 ffsino 296 1776 0 257 117 0 117 117 0 8 0 nchpl 144 2168 0 471 63 0 63 63 0 8 0 vnodes 216 1946 0 0 109 0 109 109 0 8 0 namei 1024 6734 0 6734 1 0 1 1 0 8 1 percpumem 16 50 0 2 1 0 1 1 0 8 0 kstatmem 264 24 0 4 2 0 2 2 0 8 0 scxspl 216 6918 0 6918 3 2 1 2 1 8 1 plimitpl 152 138 0 115 2 0 2 2 0 8 1 sigapl 424 589 0 537 7 0 7 7 0 8 0 knotepl 120 595 0 0 19 0 19 19 0 8 0 kqueuepl 224 63 0 53 1 0 1 1 0 8 0 pipepl 344 153 0 126 3 0 3 3 0 8 0 fdescpl 528 573 0 538 4 0 4 4 0 8 0 filepl 160 2760 0 2531 18 0 18 18 0 8 7 lockfpl 104 50 0 45 1 0 1 1 0 8 0 lockfspl 48 21 0 18 1 0 1 1 0 8 0 sessionpl 144 32 0 17 1 0 1 1 0 8 0 pgrppl 48 53 0 30 1 0 1 1 0 8 0 ucredpl 104 264 0 247 1 0 1 1 0 8 0 zombiepl 144 539 0 537 1 0 1 1 0 8 0 processpl 1232 589 0 537 5 0 5 5 0 8 0 procpl 664 874 0 815 7 0 7 7 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 708 0 669 22 9 13 22 0 8 8 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 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 126 0 0 16 0 16 16 0 8 0 mcl2k 2048 36 0 0 5 0 5 5 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 3055 0 0 191 0 191 191 0 8 0 bufpl 280 2439 0 118 166 0 166 166 0 8 0 anonpl 32 5354 0 0 44 0 44 44 0 246 0 amapchunkpl 152 13217 0 12746 29 0 29 29 0 158 6 amappl16 200 1584 0 1565 4 2 2 4 0 8 0 amappl15 192 76 0 76 1 1 0 1 0 8 0 amappl14 184 9 0 9 2 1 1 1 0 8 1 amappl13 176 402 0 400 1 0 1 1 0 8 0 amappl12 168 911 0 867 3 0 3 3 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 42 0 32 1 0 1 1 0 8 0 amappl9 144 253 0 253 1 1 0 1 0 8 0 amappl8 136 35 0 34 1 0 1 1 0 8 0 amappl7 128 75 0 72 1 0 1 1 0 8 0 amappl6 120 279 0 267 1 0 1 1 0 8 0 amappl5 112 71 0 63 1 0 1 1 0 8 0 amappl4 104 372 0 346 1 0 1 1 0 8 0 amappl3 96 2137 0 2052 3 0 3 3 0 8 0 amappl2 88 698 0 618 2 0 2 2 0 8 0 amappl1 80 10169 0 9544 14 0 14 14 0 8 1 amappl 88 3661 0 3498 5 0 5 5 0 92 0 uvmvnodes 80 103 0 0 3 0 3 3 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 9 0 2 1 0 1 1 0 8 0 uaddrrnd 24 573 0 538 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 573 0 538 1 0 1 1 0 8 0 vmmpekpl 168 6810 0 6768 3 0 3 3 0 8 0 vmmpepl 168 44333 0 42300 99 0 99 99 0 357 8 vmsppl 488 572 0 538 7 1 6 6 0 8 0 rwobjpl 80 15032 0 14018 22 0 22 22 0 8 0 pdppl 4096 1153 0 1076 109 28 81 99 0 8 4 pvpl 32 12949 0 0 106 1 105 105 0 265 0 pmappl 256 572 0 538 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 468 0 31 13 0 13 13 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(ffffffff833a8d78) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838ebf28,1,ffff80002f3c2c98) at pool_do_get+0x5df pool_get(ffffffff838ebf28,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7ca8,ffff80002f3c2ef0,186,ffff80002f3c2e40) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7ca8,ffff80002f3c2ef0,ffff80002f3c2e40) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f3c2ef0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f3c2ef0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7643379ba30, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299ddff0) 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 end of kernel end trace frame: 0x77310108ea10, count: 12 ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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 end of kernel end trace frame: 0x77310108ea10, count: -3