panic: pool_do_get: shmpl free list modified: page 0xfffffd806c0c2000; item addr 0xfffffd806c0c2ee0; offset 0x40=0x69f2dcaa Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 1222 2340 32767 0x10 0 1 syz-executor *162961 63870 32767 0x10 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344527b) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83acde88,1,ffff80003a7cddf8) at pool_do_get+0x5df pool_get(ffffffff83acde88,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c3ecd20,ffff80003a7ce050,1b4,ffff80003a7cdfa0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c3ecd20,ffff80003a7ce050,ffff80003a7cdfa0) at sys_shmget+0x195 sys/kern/sysv_shm.c:484 syscall(ffff80003a7ce050) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a7ce050) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfa536fa1bd0, 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 0xfffffd806c0c2000; item addr 0xfffffd806c0c2ee0; offset 0x40=0x69f2dcaa ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344527b) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83acde88,1,ffff80003a7cddf8) at pool_do_get+0x5df pool_get(ffffffff83acde88,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c3ecd20,ffff80003a7ce050,1b4,ffff80003a7cdfa0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c3ecd20,ffff80003a7ce050,ffff80003a7cdfa0) at sys_shmget+0x195 sys/kern/sysv_shm.c:484 syscall(ffff80003a7ce050) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a7ce050) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfa536fa1bd0, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003a7cdc20 rbx 0xffffffff8389ce07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff80003c3ecd20 rax 0xffffffff8389bff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x1ab6268b12f7ba5a r11 0x8268436ed3693785 r12 0xffffffff8389cc08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff82a3c0b5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003a7cdc10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=162961 pid=63870 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3ed780,0xffff80003c3ed4f8 process=0xffff80003c3df510 user=0xffff80003a7c9000, vmspace=0xfffffd806c9c6d78 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 84435 209193 42896 32767 2 0x10 syz-executor 2340 1222 78291 32767 7 0x10 syz-executor 2340 471861 78291 32767 2 0x4000090 syz-executor 2492 453241 19819 32767 3 0x90 nanoslp syz-executor 2492 379178 19819 32767 3 0x4000090 semwait syz-executor 2492 217627 19819 32767 2 0x4000010 syz-executor 2492 60737 19819 32767 3 0x4000090 fsleep syz-executor 49246 227831 41584 32767 2 0x10 syz-executor 49246 495812 41584 32767 3 0x4000090 ttyout syz-executor 49246 220107 41584 32767 3 0x4000090 fsleep syz-executor 36615 247631 73456 32767 3 0x90 nanoslp syz-executor 36615 20839 73456 32767 3 0x4000090 fsleep syz-executor 36615 237128 73456 32767 3 0x4000090 fsleep syz-executor 75300 122027 96307 32767 3 0x90 nanoslp syz-executor 75300 254169 96307 32767 3 0x4000090 kqsel syz-executor 75300 5058 96307 32767 3 0x4000090 kqsel syz-executor 75300 204384 96307 32767 3 0x4000090 fsleep syz-executor 63870 446845 34322 32767 2 0x10 syz-executor *63870 162961 34322 32767 7 0x4000010 syz-executor 27028 41937 65871 32767 3 0x10 biowait syz-executor 42896 186206 96174 32767 3 0x90 nanoslp syz-executor 41584 298333 21557 32767 3 0x90 nanoslp syz-executor 78291 50622 41019 32767 3 0x90 nanoslp syz-executor 73456 30847 76343 32767 3 0x90 nanoslp syz-executor 19819 316498 75767 32767 3 0x90 nanoslp syz-executor 34322 314482 78161 32767 3 0x90 nanoslp syz-executor 96307 471180 56078 32767 3 0x90 nanoslp syz-executor 21557 326023 88144 0 3 0x82 wait syz-executor 96174 48957 88144 0 3 0x82 wait syz-executor 41019 306217 88144 0 3 0x82 wait syz-executor 76343 333319 88144 0 3 0x82 wait syz-executor 75767 328227 88144 0 3 0x82 wait syz-executor 56078 350110 88144 0 3 0x82 wait syz-executor 78161 511894 88144 0 3 0x82 wait syz-executor 65871 193469 88144 0 3 0x82 wait syz-executor 88144 293210 61764 0 3 0x82 kqread syz-executor 61764 339149 85821 0 3 0x10008a sigsusp ksh 85821 30354 4599 0 3 0x98 kqread sshd-session 4599 100432 9097 0 3 0x92 kqread sshd-session 9460 519209 1 0 3 0x100083 ttyin getty 9097 401175 1 0 3 0x88 kqread sshd 96823 261648 83618 73 3 0x1100090 kqread syslogd 83618 355761 1 0 3 0x100082 sbwait syslogd 69388 322351 1 0 3 0x100080 kqread resolvd 92592 456962 93054 77 3 0x100092 kqread dhcpleased 33198 377002 93054 77 3 0x100092 kqread dhcpleased 93054 273781 1 0 3 0x80 kqread dhcpleased 76385 77091 0 0 3 0x14200 bored smr 26340 277499 0 0 2 0x14200 zerothread 43963 341899 0 0 3 0x14200 aiodoned aiodoned 43600 415243 0 0 3 0x14200 syncer update 11317 13821 0 0 3 0x14200 cleaner cleaner 88977 410486 0 0 3 0x14200 reaper reaper 94032 74705 0 0 3 0x14200 pgdaemon pagedaemon 40456 339908 0 0 3 0x14200 bored viomb 55921 159047 0 0 3 0x40014200 acpi0 acpi0 20184 39206 0 0 3 0x40014200 idle1 38569 441322 0 0 3 0x14200 bored softnet1 42540 369364 0 0 3 0x14200 bored softnet0 25803 270873 0 0 3 0x14200 bored systqmp 84896 214813 0 0 3 0x14200 bored systq 10518 394838 0 0 3 0x14200 tmoslp softclockmp 30854 442230 0 0 3 0x40014200 tmoslp softclock 82924 53014 0 0 3 0x40014200 idle0 1 186892 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 (0xffffffff83acdea0) #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:484 #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 63870 (syz-executor) thread 0xffff80003c3ecd20 (162961) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a8ea40) #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:783 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff83acdea0) #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:484 #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 27028 (syz-executor) thread 0xffff8000fffe67e8 (41937) exclusive rrwlock inode r = 0 (0xfffffd806c770b28) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3143 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d8a1548) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3128 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11054 12018K 12034K 166960K 12145 0 pcb 17 12K 12K 166960K 17 0 rtable 239 6K 7K 166960K 350 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 31 0 iov 0 0K 2K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1354 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 117K 166960K 173 0 proc 58 99K 147K 166960K 499 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 1 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 353 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 247 167K 188K 166960K 3107 0 UVM aobj 3 2K 2K 166960K 4 0 pinsyscall 46 92K 109K 166960K 1227 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 27 2K 2K 166960K 27 0 temp 38 9078K 9142K 166960K 3885 0 kqueue 13 20K 24K 166960K 25 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 35 0 32 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 46 0 29 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 13 0 8 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 79 0 70 2 0 2 2 0 8 1 nd6 152 25 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 40 454 0 0 5 0 5 5 0 8 0 art_node 32 112 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semapl 112 1 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 1 1 0 1 1 0 8 1 pool(0xffffffff83acde88:shmpl): page inconsistency: page 0xfffffd806c0c2000; 34 on list, 0 missing, 35 items per page dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1597 0 137 92 0 92 92 0 8 0 ffsino 296 1597 0 137 113 0 113 113 0 8 0 nchpl 144 1825 0 140 63 0 63 63 0 8 0 vnodes 216 1678 0 0 94 0 94 94 0 8 0 namei 1024 5297 0 5296 1 0 1 1 0 8 0 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 25 0 0 2 0 2 2 0 8 0 scxspl 216 6114 0 6113 4 1 3 3 1 8 2 plimitpl 152 38 0 12 1 0 1 1 0 8 0 sigapl 424 458 0 405 7 0 7 7 0 8 0 knotepl 120 62 0 0 2 0 2 2 0 8 0 kqueuepl 224 26 0 15 1 0 1 1 0 8 0 pipepl 344 115 0 88 3 0 3 3 0 8 0 fdescpl 528 442 0 405 3 0 3 3 0 8 0 filepl 160 1517 0 1296 10 0 10 10 0 8 0 lockfpl 104 23 0 20 1 0 1 1 0 8 0 lockfspl 48 11 0 8 1 0 1 1 0 8 0 sessionpl 144 22 0 6 1 0 1 1 0 8 0 pgrppl 48 30 0 6 1 0 1 1 0 8 0 ucredpl 104 129 0 110 1 0 1 1 0 8 0 zombiepl 144 405 0 405 1 0 1 1 0 8 1 processpl 1232 458 0 405 5 0 5 5 0 8 0 procpl 664 519 0 454 6 0 6 6 0 8 0 sosppl 176 4 0 4 1 0 1 1 0 8 1 sockpl 752 160 0 131 4 0 4 4 0 8 1 mcl64k 65536 2 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 17 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 174 0 0 11 0 11 11 0 8 0 bufpl 280 2258 0 102 154 0 154 154 0 8 0 anonpl 32 5226 0 0 43 0 43 43 0 246 0 amapchunkpl 152 9334 0 8789 36 0 36 36 0 158 13 amappl16 200 1816 0 1795 5 0 5 5 0 8 3 amappl15 192 58 0 58 1 0 1 1 0 8 1 amappl14 184 399 0 397 1 0 1 1 0 8 0 amappl13 176 110 0 100 1 0 1 1 0 8 0 amappl12 168 674 0 639 2 0 2 2 0 8 0 amappl11 160 8 0 8 1 0 1 1 0 8 1 amappl10 152 58 0 48 1 0 1 1 0 8 0 amappl9 144 259 0 259 1 0 1 1 0 8 1 amappl8 136 92 0 91 1 0 1 1 0 8 0 amappl7 128 137 0 125 1 0 1 1 0 8 0 amappl6 120 165 0 164 1 0 1 1 0 8 0 amappl5 112 97 0 90 1 0 1 1 0 8 0 amappl4 104 248 0 235 1 0 1 1 0 8 0 amappl3 96 1596 0 1468 5 1 4 4 0 8 0 amappl2 88 548 0 496 2 0 2 2 0 8 0 amappl1 80 8982 0 8407 14 0 14 14 0 8 0 amappl 88 2451 0 2269 5 0 5 5 0 92 0 uvmvnodes 80 99 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 3 0 1 1 0 1 1 0 8 0 uaddrrnd 24 442 0 405 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 442 0 405 1 0 1 1 0 8 0 vmmpekpl 168 5144 0 5116 2 0 2 2 0 8 0 vmmpepl 168 35858 0 33820 94 0 94 94 0 357 4 vmsppl 488 441 0 405 7 1 6 6 0 8 0 rwobjpl 80 13320 0 12381 22 0 22 22 0 8 0 pdppl 4096 891 0 810 103 10 93 93 0 8 12 pvpl 32 11562 0 0 95 1 94 95 0 265 0 pmappl 256 441 0 405 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 269 0 13 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(ffffffff8344527b) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83acde88,1,ffff80003a7cddf8) at pool_do_get+0x5df pool_get(ffffffff83acde88,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c3ecd20,ffff80003a7ce050,1b4,ffff80003a7cdfa0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c3ecd20,ffff80003a7ce050,ffff80003a7cdfa0) at sys_shmget+0x195 sys/kern/sysv_shm.c:484 syscall(ffff80003a7ce050) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a7ce050) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfa536fa1bd0, 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 end of kernel end trace frame: 0x70b6b96380f0, count: 12 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 end of kernel end trace frame: 0x70b6b96380f0, count: -3