panic: pool_do_get: shmpl free list modified: page 0xfffffd806b99d000; item addr 0xfffffd806b99d930; offset 0x40=0x67b06344 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 14582 11274 32767 0x10 0 0 syz-executor *110147 11274 32767 0x10 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833a7b0d) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839c5b60,1,ffff80003c52d218) at pool_do_get+0x5da pool_get(ffffffff839c5b60,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff59c8,ffff80003c52d470,0,ffff80003c52d3c0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff59c8,ffff80003c52d470,ffff80003c52d3c0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c52d470) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c52d470) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb70236e4c20, 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 0xfffffd806b99d000; item addr 0xfffffd806b99d930; offset 0x40=0x67b06344 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833a7b0d) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839c5b60,1,ffff80003c52d218) at pool_do_get+0x5da pool_get(ffffffff839c5b60,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff59c8,ffff80003c52d470,0,ffff80003c52d3c0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff59c8,ffff80003c52d470,ffff80003c52d3c0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c52d470) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c52d470) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb70236e4c20, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c52d050 rbx 0xffff800029a9cdc7 rdx 0xffff800001422b80 rcx 0xffff8000ffff59c8 rax 0xffff800029a9bff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x6afdf04f9e8bb901 r11 0x62007f68e049bd47 r12 0xffff800029a9cbc8 r13 0 r14 0 r15 0x1 rip 0xffffffff81c4f0b5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c52d040 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=110147 pid=11274 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=74, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff54a8,0xffff8000ffff4f98 process=0xffff80003a8ec250 user=0xffff80003c528000, vmspace=0xfffffd806c05f748 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 19570 322720 7632 32767 2 0x10 syz-executor 19570 253517 7632 32767 3 0x4000090 fsleep syz-executor 90162 97891 86887 32767 2 0x10 syz-executor 90162 86070 86887 32767 2 0x4000010 syz-executor 11274 14582 51481 32767 7 0x10 syz-executor *11274 110147 51481 32767 7 0x4000010 syz-executor 50608 350842 38800 32767 2 0x10 syz-executor 50608 285881 38800 32767 3 0x4000090 kqpoll syz-executor 55340 323963 35995 32767 2 0x10 syz-executor 55340 484888 35995 32767 3 0x4000090 fsleep syz-executor 7837 19955 0 0 3 0x14200 bored sosplice 64936 418201 58819 0 3 0x100082 sbwait arp 58819 328247 1986 0 3 0x10008a sigsusp sh 7632 186300 97942 32767 3 0x90 nanoslp syz-executor 35995 13688 63855 32767 3 0x90 nanoslp syz-executor 86887 321591 41355 32767 3 0x90 nanoslp syz-executor 1986 468928 821 0 3 0x80 wait syz-executor 51481 502084 81231 32767 3 0x90 nanoslp syz-executor 38800 196619 21451 32767 3 0x90 nanoslp syz-executor 95871 169841 98353 32767 3 0x10 biowait syz-executor 35491 250206 67389 32767 3 0x90 nanoslp syz-executor 821 356012 70751 0 3 0x82 wait syz-executor 97942 145527 70751 0 3 0x82 wait syz-executor 21451 376337 70751 0 3 0x82 wait syz-executor 41355 204281 70751 0 3 0x82 wait syz-executor 81231 425399 70751 0 3 0x82 wait syz-executor 67389 378987 70751 0 3 0x82 wait syz-executor 63855 333528 70751 0 3 0x82 wait syz-executor 98353 6841 70751 0 3 0x82 wait syz-executor 70751 226479 32859 0 3 0x82 kqread syz-executor 32859 84415 52212 0 3 0x10008a sigsusp ksh 52212 413627 57757 0 3 0x98 kqread sshd-session 57757 311966 21529 0 3 0x92 kqread sshd-session 69797 407286 1 0 3 0x100083 ttyin getty 21529 438516 1 0 3 0x88 kqread sshd 49142 68027 81639 73 3 0x1100090 kqread syslogd 81639 152739 1 0 3 0x100082 sbwait syslogd 97510 258353 1 0 3 0x100080 kqread resolvd 23843 510743 62169 77 3 0x100092 kqread dhcpleased 16457 402649 62169 77 3 0x100092 kqread dhcpleased 62169 145200 1 0 3 0x80 kqread dhcpleased 23824 422318 0 0 3 0x14200 bored smr 30969 290482 0 0 2 0x14200 zerothread 98569 80657 0 0 3 0x14200 aiodoned aiodoned 58706 409916 0 0 3 0x14200 syncer update 81752 335938 0 0 3 0x14200 cleaner cleaner 66926 270511 0 0 3 0x14200 reaper reaper 43397 162254 0 0 3 0x14200 pgdaemon pagedaemon 78967 490945 0 0 3 0x14200 bored viomb 84771 153979 0 0 3 0x40014200 acpi0 acpi0 14660 182489 0 0 3 0x40014200 idle1 55770 14301 0 0 3 0x14200 bored softnet3 14455 462204 0 0 3 0x14200 bored softnet2 1137 191328 0 0 3 0x14200 bored softnet1 77238 253022 0 0 3 0x14200 bored softnet0 66358 99376 0 0 3 0x14200 bored systqmp 52838 316076 0 0 3 0x14200 bored systq 52457 23901 0 0 3 0x14200 tmoslp softclockmp 60237 479186 0 0 3 0x40014200 tmoslp softclock 87976 85099 0 0 3 0x40014200 idle0 1 101842 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 (0xffffffff839c5b78) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pool_get+0x10b sys/kern/subr_pool.c:583 #4 shmget_allocate_segment+0x1a7 #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:577 #7 Xsyscall+0x128 Process 11274 (syz-executor) thread 0xffff8000ffff59c8 (110147) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839a2370) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #1 syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff839c5b78) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pool_get+0x10b sys/kern/subr_pool.c:583 #4 shmget_allocate_segment+0x1a7 #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:577 #7 Xsyscall+0x128 Process 95871 (syz-executor) thread 0xffff8000ffff8a58 (169841) exclusive rrwlock inode r = 0 (0xfffffd806b9b3428) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:694 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1860 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806f636988) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1860 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10217 10958K 10966K 166960K 11298 0 pcb 17 12K 12K 166960K 17 0 rtable 224 6K 6K 166960K 340 0 pf 31 16K 16K 166960K 31 0 ifaddr 40 7K 7K 166960K 42 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 1K 166960K 1 0 counters 64 36K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 33 0 iov 0 0K 20K 166960K 16 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1333 84K 84K 166960K 1361 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 23 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 26 97K 125K 166960K 330 0 sigio 0 0K 0K 166960K 6 0 proc 58 79K 103K 166960K 472 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 1 0K 0K 166960K 43 0 in_multi 89 6K 6K 166960K 97 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 359 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 235 73K 87K 166960K 4430 0 UVM aobj 10 2K 2K 166960K 14 0 pinsyscall 48 96K 118K 166960K 1321 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 12 0 NDP 11 0K 1K 166960K 25 0 temp 48 8641K 8705K 166960K 4446 0 kqueue 13 20K 30K 166960K 54 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 50 0 46 1 0 1 1 0 8 0 rtentry 168 107 0 2 5 0 5 5 0 8 0 unpcb 144 419 0 401 8 0 8 8 0 8 7 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 808 130 0 121 3 0 3 3 0 8 2 arp 120 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 2 0 2 1 0 1 1 0 8 1 inpcb 376 349 0 335 5 0 5 5 0 8 3 nd6 136 24 0 1 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 256 417 0 2 26 0 26 26 0 8 0 art_table 32 418 0 2 4 0 4 4 0 8 0 art_node 16 106 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 7 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 11 0 4 1 0 1 1 0 8 0 pool(0xffffffff839c5b60:shmpl): page inconsistency: page 0xfffffd806b99d000; 27 on list, 7 missing, 35 items per page dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1809 0 309 95 0 95 95 0 8 0 ffsino 280 1809 0 309 108 0 108 108 0 8 0 nchpl 144 2261 0 590 63 0 63 63 0 8 0 uvmvnodes 80 1890 0 0 39 0 39 39 0 8 0 vnodes 216 1890 0 0 105 0 105 105 0 8 0 namei 1024 6911 0 6911 1 0 1 1 0 8 1 percpumem 16 46 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 7301 0 7300 3 2 1 2 1 8 0 plimitpl 152 200 0 176 2 0 2 2 0 8 1 sigapl 424 603 0 546 8 0 8 8 0 8 0 futexpl 64 2789 0 2787 1 0 1 1 0 8 0 knotepl 120 67 0 0 3 0 3 3 0 8 0 kqueuepl 216 107 0 97 2 0 2 2 0 8 1 pipepl 328 182 0 155 3 0 3 3 0 8 0 fdescpl 504 584 0 546 7 1 6 6 0 8 0 filepl 152 3029 0 2817 17 0 17 17 0 8 8 lockfpl 104 75 0 73 1 0 1 1 0 8 0 lockfspl 48 27 0 25 1 0 1 1 0 8 0 sessionpl 144 22 0 6 1 0 1 1 0 8 0 pgrppl 48 33 0 9 1 0 1 1 0 8 0 ucredpl 104 441 0 423 1 0 1 1 0 8 0 zombiepl 144 547 0 546 1 0 1 1 0 8 0 processpl 1168 603 0 546 5 0 5 5 0 8 0 procpl 656 949 0 887 7 0 7 7 0 8 0 sosppl 168 3 0 3 1 0 1 1 0 8 1 sockpl 688 821 0 786 22 10 12 22 0 8 8 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 135 0 0 17 0 17 17 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 275 0 0 18 0 18 18 0 8 0 bufpl 280 2668 0 125 182 0 182 182 0 8 0 anonpl 24 91445 0 88189 46 0 46 46 0 184 18 amapchunkpl 152 13401 0 12875 29 0 29 29 0 158 7 amappl16 200 1479 0 1461 17 3 14 14 0 8 10 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 119 0 108 1 0 1 1 0 8 0 amappl13 176 5 0 4 1 0 1 1 0 8 0 amappl12 168 1169 0 1131 2 0 2 2 0 8 0 amappl11 160 45 0 35 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 19 0 17 1 0 1 1 0 8 0 amappl7 128 109 0 97 1 0 1 1 0 8 0 amappl6 120 157 0 153 1 0 1 1 0 8 0 amappl5 112 109 0 102 1 0 1 1 0 8 0 amappl4 104 287 0 270 1 0 1 1 0 8 0 amappl3 96 2478 0 2352 4 0 4 4 0 8 0 amappl2 88 597 0 540 2 0 2 2 0 8 0 amappl1 80 8141 0 7569 14 0 14 14 0 8 0 amappl 88 4078 0 3894 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 128 253 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 13 0 4 1 0 1 1 0 8 0 uaddrrnd 24 584 0 546 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 584 0 546 1 0 1 1 0 8 0 vmmpekpl 168 6327 0 6294 2 0 2 2 0 8 0 vmmpepl 168 41072 0 39054 103 0 103 103 0 357 6 vmsppl 456 583 0 546 7 1 6 6 0 8 0 rwobjpl 64 15493 0 12718 50 0 50 50 0 8 3 pdppl 4096 1176 0 1092 110 24 86 98 0 8 2 pvpl 32 14915 0 0 121 0 121 121 0 265 0 pmappl 248 583 0 546 4 1 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 296 0 27 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837bdff0) 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(ffffffff839a2168) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839a2168) at __mp_lock+0x199 sys/kern/kern_lock.c:144 intr_handler(ffff80003c51b2a0,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7274566cc2b0, count: 9 ddb{0}> trace x86_ipi_db(ffffffff837bdff0) 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(ffffffff839a2168) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839a2168) at __mp_lock+0x199 sys/kern/kern_lock.c:144 intr_handler(ffff80003c51b2a0,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7274566cc2b0, 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(ffffffff833a7b0d) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839c5b60,1,ffff80003c52d218) at pool_do_get+0x5da pool_get(ffffffff839c5b60,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff59c8,ffff80003c52d470,0,ffff80003c52d3c0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff59c8,ffff80003c52d470,ffff80003c52d3c0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c52d470) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c52d470) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb70236e4c20, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833a7b0d) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839c5b60,1,ffff80003c52d218) at pool_do_get+0x5da pool_get(ffffffff839c5b60,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff59c8,ffff80003c52d470,0,ffff80003c52d3c0) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff59c8,ffff80003c52d470,ffff80003c52d3c0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c52d470) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c52d470) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb70236e4c20, count: -8