îpanic: pool_do_get: shmpl free list modified: page 0xfffffd8068ee5000; item addr 0xfffffd8068ee55b0; offset 0x40=0x682f86c3 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 389215 97064 0 0 0 0 syz-executor * 59869 97064 0 0 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833cc972) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839caa68,1,ffff80003c452fd8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff839caa68,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000383fe558,ffff80003c453230,51,ffff80003c453180) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000383fe558,ffff80003c453230,ffff80003c453180) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c453230) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c453230) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x19fccc5e5c0, 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 0xfffffd8068ee5000; item addr 0xfffffd8068ee55b0; offset 0x40=0x682f86c3 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833cc972) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839caa68,1,ffff80003c452fd8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff839caa68,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000383fe558,ffff80003c453230,51,ffff80003c453180) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000383fe558,ffff80003c453230,ffff80003c453180) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c453230) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c453230) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x19fccc5e5c0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c452e10 rbx 0xffff8000299dedd7 rdx 0 rcx 0xffff8000383fe558 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xff1ca8e36d6aaae4 r11 0xfe1ca1383f2cd2f0 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff82cba885 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c452e00 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=59869 pid=97064 tcnt=4 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=0xffff8000383fe7e8,0xffff8000383ff238 process=0xffff8000fffe4e50 user=0xffff80003c44e000, vmspace=0xfffffd806d49b010 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 91884 41434 40790 0 2 0 syz-executor 91884 241147 40790 0 3 0x4000080 fsleep syz-executor 97064 389215 8167 0 7 0 syz-executor *97064 59869 8167 0 7 0x4000000 syz-executor 97064 494457 8167 0 2 0x4000080 syz-executor 97064 82173 8167 0 3 0x4000080 fsleep syz-executor 60993 419339 13442 0 2 0 syz-executor 82312 44359 18018 0 2 0 syz-executor 82312 175257 18018 0 3 0x4000080 fsleep syz-executor 62643 499907 39712 0 2 0 syz-executor 62643 111005 39712 0 3 0x4000080 fsleep syz-executor 52206 104024 14703 0 2 0 syz-executor 52206 415859 14703 0 3 0x4000080 kqread syz-executor 52206 176901 14703 0 3 0x4000080 fsleep syz-executor 65495 357088 67740 0 2 0 syz-executor 65495 437962 67740 0 3 0x4000080 fsleep syz-executor 37436 57756 0 0 3 0x14200 acct acct 86471 235209 1 0 3 0x80 nanoslp init 64890 20471 0 0 3 0x14280 nfsidl nfsio 80080 324141 0 0 3 0x14280 nfsidl nfsio 93827 484262 0 0 3 0x14280 nfsidl nfsio 67713 24285 0 0 3 0x14280 nfsidl nfsio 90898 436230 0 0 3 0x14280 nfsidl nfsio 21663 86145 0 0 3 0x14280 nfsidl nfsio 6226 154620 0 0 3 0x14280 nfsidl nfsio 19624 158040 0 0 3 0x14280 nfsidl nfsio 5079 87265 0 0 3 0x14280 nfsidl nfsio 293 254150 0 0 3 0x14280 nfsidl nfsio 82036 51334 0 0 3 0x14280 nfsidl nfsio 60004 454615 0 0 3 0x14280 nfsidl nfsio 94438 54994 0 0 3 0x14280 nfsidl nfsio 20306 73542 0 0 3 0x14280 nfsidl nfsio 12171 418457 0 0 3 0x14280 nfsidl nfsio 6829 364872 0 0 3 0x14280 nfsidl nfsio 43911 168665 0 0 3 0x14280 nfsidl nfsio 15330 416940 0 0 3 0x14280 nfsidl nfsio 42248 461396 0 0 3 0x14280 nfsidl nfsio 1168 364671 0 0 3 0x14280 nfsidl nfsio 14703 346512 77017 0 3 0x82 nanoslp syz-executor 94977 238213 0 0 3 0x14200 bored sosplice 67740 204142 77017 0 3 0x82 nanoslp syz-executor 97354 344628 77017 0 2 0x2 syz-executor 8167 127775 77017 0 3 0x82 nanoslp syz-executor 39712 340678 77017 0 3 0x82 nanoslp syz-executor 13442 286736 77017 0 2 0x2 syz-executor 40790 380438 77017 0 3 0x82 nanoslp syz-executor 18018 483733 77017 0 3 0x82 nanoslp syz-executor 77017 178666 96018 0 3 0x82 kqread syz-executor 96018 488644 54038 0 3 0x10008a sigsusp ksh 54038 360654 59445 0 3 0x98 kqread sshd-session 59445 26052 71367 0 3 0x92 kqread sshd-session 71367 286021 1 0 3 0x88 kqread sshd 3190 218100 72196 74 3 0x1100092 bpf pflogd 72196 12550 1 0 3 0x80 sbwait pflogd 17215 351952 60796 73 3 0x1100090 kqread syslogd 60796 299984 1 0 3 0x100082 sbwait syslogd 25408 296454 1 0 3 0x100080 kqread resolvd 50626 217262 21800 77 3 0x100092 kqread dhcpleased 22556 313123 21800 77 3 0x100092 kqread dhcpleased 21800 478981 1 0 3 0x80 kqread dhcpleased 64199 414646 0 0 3 0x14200 bored smr 20518 28767 0 0 2 0x14200 zerothread 123 392322 0 0 3 0x14200 aiodoned aiodoned 60728 117560 0 0 3 0x14200 syncer update 82866 284141 0 0 3 0x14200 cleaner cleaner 66693 56198 0 0 3 0x14200 reaper reaper 38566 9690 0 0 3 0x14200 pgdaemon pagedaemon 89479 154751 0 0 3 0x14200 bored viomb 59348 428852 0 0 3 0x40014200 acpi0 acpi0 95361 116496 0 0 3 0x40014200 idle1 39859 327230 0 0 3 0x14200 bored softnet3 51114 32420 0 0 3 0x14200 bored softnet2 50348 422928 0 0 3 0x14200 bored softnet1 10921 19748 0 0 3 0x14200 bored softnet0 67153 92978 0 0 3 0x14200 bored systqmp 55435 209979 0 0 3 0x14200 bored systq 54536 118086 0 0 3 0x14200 tmoslp softclockmp 73769 164856 0 0 3 0x40014200 tmoslp softclock 43921 278254 0 0 3 0x40014200 idle0 1 389061 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 (0xffffffff839caa80) #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:295 #2 mtx_enter+0x62 sys/kern/kern_lock.c:252 #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:579 #7 Xsyscall+0x128 Process 97064 (syz-executor) thread 0xffff8000383fe558 (59869) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839e43d8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #1 syscall+0xae6 sys/arch/amd64/amd64/trap.c:579 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff839caa80) #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:295 #2 mtx_enter+0x62 sys/kern/kern_lock.c:252 #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:579 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10212 11096K 11539K 166960K 11920 0 pcb 18 12K 13K 166960K 93 0 rtable 164 6K 8K 166960K 420 0 pf 34 17K 18K 166960K 71 0 ifaddr 35 5K 8K 166960K 64 0 ifgroup 55 2K 2K 166960K 92 0 sysctl 3 1K 9K 166960K 7 0 counters 68 36K 37K 166960K 102 0 ioctlops 0 0K 4K 166960K 1528 0 iov 0 0K 12K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1341 84K 85K 166960K 1695 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 15 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 447 0 sigio 0 0K 0K 166960K 16 0 proc 63 79K 128K 166960K 599 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 40 0 in_multi 69 4K 7K 166960K 126 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 1 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 411 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 228 171K 189K 166960K 5730 0 UVM aobj 12 4K 4K 166960K 15 0 pinsyscall 41 82K 104K 166960K 1596 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 79 0 NDP 12 0K 2K 166960K 41 0 temp 43 8675K 8742K 166960K 11687 0 kqueue 14 22K 30K 166960K 60 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 53 0 50 1 0 1 1 0 8 0 rtentry 176 127 0 57 6 0 6 6 0 8 0 unpcb 144 180 0 161 2 1 1 2 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 808 72 0 67 1 0 1 1 0 8 0 arp 128 21 0 8 1 0 1 1 0 8 0 inpcb 384 356 0 347 5 0 5 5 0 8 4 nd6 144 28 0 12 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 11 0 11 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 0 1 1 0 8 1 pffrag 232 4 0 1 1 0 1 1 0 482 0 pffrnode 88 4 0 1 1 0 1 1 0 8 0 pffrent 40 7 0 4 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 pfstitem 24 34 0 0 1 0 1 1 0 8 0 pfstkey 128 34 0 0 2 0 2 2 0 8 0 pfstate 384 34 0 0 4 0 4 4 0 8 0 pfrule 1344 31 0 16 3 1 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 545 0 232 29 0 29 29 0 8 3 art_table 32 546 0 232 4 0 4 4 0 8 0 art_node 16 126 0 65 1 0 1 1 0 8 0 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 12 0 3 1 0 1 1 0 8 0 pool(0xffffffff839caa68:shmpl): page inconsistency: page 0xfffffd8068ee5000; 25 on list, 9 missing, 35 items per page dirhash 1024 21 0 2 3 0 3 3 0 8 0 dino2pl 256 2081 0 572 95 0 95 95 0 8 0 ffsino 288 2081 0 572 109 0 109 109 0 8 0 nchpl 144 2662 0 974 64 0 64 64 0 8 0 rtmask 32 4 0 4 1 0 1 1 0 8 1 uvmvnodes 80 2405 0 0 50 0 50 50 0 8 0 vnodes 216 2405 0 0 134 0 134 134 0 8 0 namei 1024 8451 0 8451 1 0 1 1 0 8 1 percpumem 16 66 0 17 1 0 1 1 0 8 0 kstatmem 264 50 0 22 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 8042 0 8042 3 2 1 2 1 8 1 plimitpl 152 89 0 72 1 0 1 1 0 8 0 sigapl 424 778 0 707 10 1 9 9 0 8 0 knotepl 120 543 0 0 17 0 17 17 0 8 0 kqueuepl 224 91 0 79 2 0 2 2 0 8 1 pipepl 336 125 0 98 3 0 3 3 0 8 0 fdescpl 520 738 0 707 3 0 3 3 0 8 0 filepl 160 3253 0 3034 11 0 11 11 0 8 1 lockfpl 104 138 0 134 1 0 1 1 0 8 0 lockfspl 48 34 0 30 1 0 1 1 0 8 0 sessionpl 144 26 0 18 1 0 1 1 0 8 0 pgrppl 48 41 0 25 1 0 1 1 0 8 0 ucredpl 104 311 0 298 1 0 1 1 0 8 0 zombiepl 144 707 0 707 1 0 1 1 0 8 1 processpl 1208 778 0 707 6 0 6 6 0 8 0 procpl 656 1284 0 1204 9 1 8 8 0 8 0 srpgc 96 8 0 8 1 0 1 1 0 8 1 sockpl 728 592 0 561 7 1 6 7 0 8 2 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 29 0 0 1 0 1 1 0 8 0 mbufpl 256 167 0 0 11 0 11 11 0 8 0 bufpl 280 2714 0 124 185 0 185 185 0 8 0 anonpl 32 5592 0 0 46 0 46 46 0 246 0 amapchunkpl 152 17823 0 17357 27 0 27 27 0 158 7 amappl16 200 1999 0 1969 5 3 2 5 0 8 0 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 122 0 111 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1411 0 1382 4 2 2 3 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 1 0 1 1 1 0 1 0 8 0 amappl9 144 263 0 263 1 1 0 1 0 8 0 amappl8 136 20 0 18 1 0 1 1 0 8 0 amappl7 128 112 0 101 1 0 1 1 0 8 0 amappl6 120 195 0 191 1 0 1 1 0 8 0 amappl5 112 130 0 120 1 0 1 1 0 8 0 amappl4 104 328 0 310 1 0 1 1 0 8 0 amappl3 96 3302 0 3197 4 0 4 4 0 8 0 amappl2 88 672 0 613 2 0 2 2 0 8 0 amappl1 80 10138 0 9553 15 0 15 15 0 8 0 amappl 88 4956 0 4798 5 0 5 5 0 92 1 dma4096 4096 2 0 2 2 2 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 14 0 3 1 0 1 1 0 8 0 uaddrrnd 24 738 0 707 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 738 0 707 1 0 1 1 0 8 0 vmmpekpl 168 7739 0 7700 3 0 3 3 0 8 0 vmmpepl 168 52401 0 50465 96 0 96 96 0 357 6 vmsppl 480 737 0 707 5 0 5 5 0 8 0 rwobjpl 72 18705 0 15400 61 0 61 61 0 8 0 pdppl 4096 1483 0 1414 101 30 71 87 0 8 2 pvpl 32 13060 0 0 107 1 106 106 0 265 0 pmappl 256 737 0 707 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 383 0 33 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0