panic: pool_do_get: shmpl free list modified: page 0xfffffd806bf46000; item addr 0xfffffd806bf46850; offset 0x40=0x67b27641 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *347414 23625 32767 0x10 0x4000000 1K syz-executor 339884 28259 32767 0x10 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ab8c1) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839b78b8,1,ffff80003c4fa878) at pool_do_get+0x5da pool_get(ffffffff839b78b8,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff8538,ffff80003c4faad0,150,ffff80003c4faa20) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff8538,ffff80003c4faad0,ffff80003c4faa20) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c4faad0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4faad0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc95cb8e1f0, 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 0xfffffd806bf46000; item addr 0xfffffd806bf46850; offset 0x40=0x67b27641 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ab8c1) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839b78b8,1,ffff80003c4fa878) at pool_do_get+0x5da pool_get(ffffffff839b78b8,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff8538,ffff80003c4faad0,150,ffff80003c4faa20) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff8538,ffff80003c4faad0,ffff80003c4faa20) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c4faad0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4faad0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc95cb8e1f0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c4fa6b0 rbx 0xffff800029aacdc7 rdx 0xffff800001420940 rcx 0xffff8000ffff8538 rax 0xffff800029aabff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xdeb02e33b6618b97 r11 0x9183c6f6e92cfbe7 r12 0xffff800029aacbc8 r13 0 r14 0 r15 0x1 rip 0xffffffff82936ee5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4fa6a0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=347414 pid=23625 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=0xffff8000ffff8ce8,0xffff8000ffff7740 process=0xffff80003c4feb70 user=0xffff80003c4f5000, vmspace=0xfffffd806c130918 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 72808 461645 74557 0 3 0x2 biowait syz-executor 23625 280649 95855 32767 2 0x10 syz-executor *23625 347414 95855 32767 7 0x4000010 syz-executor 99663 478134 59879 32767 2 0x10 syz-executor 99663 26427 59879 32767 3 0x4000090 fsleep syz-executor 99663 475849 59879 32767 3 0x4000090 fsleep syz-executor 13000 110159 87741 32767 2 0x10 syz-executor 13000 26818 87741 32767 3 0x4000090 fsleep syz-executor 54486 93052 90407 0 3 0x82 sbwait sshd-session 52733 522890 0 0 3 0x14200 bored sosplice 24866 447285 26724 32767 3 0x90 wait syz-executor 28259 339884 21484 32767 7 0x10 syz-executor 77118 329389 16388 32767 3 0x90 nanoslp syz-executor 95855 373369 55877 32767 3 0x90 nanoslp syz-executor 59879 235358 31690 32767 3 0x90 nanoslp syz-executor 87741 521579 10938 32767 3 0x90 nanoslp syz-executor 21484 74757 74557 0 3 0x82 wait syz-executor 16388 412287 74557 0 3 0x82 wait syz-executor 31690 393120 74557 0 3 0x82 wait syz-executor 26724 246302 74557 0 3 0x82 wait syz-executor 55877 168454 74557 0 3 0x82 wait syz-executor 10938 115854 74557 0 3 0x82 wait syz-executor 74557 131363 64172 0 3 0x82 nanoslp syz-executor 64172 190660 46397 0 3 0x10008a sigsusp ksh 46397 143228 29864 0 3 0x98 kqread sshd-session 29864 54069 90407 0 3 0x92 kqread sshd-session 8561 196205 1 0 3 0x100083 ttyin getty 90407 233173 1 0 3 0x88 kqread sshd 81963 331304 38290 73 3 0x1100090 kqread syslogd 38290 121330 1 0 3 0x100082 sbwait syslogd 45380 330433 1 0 3 0x100080 kqread resolvd 9129 31071 11370 77 3 0x100092 kqread dhcpleased 12408 135147 11370 77 3 0x100092 kqread dhcpleased 11370 509653 1 0 3 0x80 kqread dhcpleased 46755 96462 0 0 3 0x14200 bored smr 26794 390958 0 0 2 0x14200 zerothread 80525 248992 0 0 3 0x14200 aiodoned aiodoned 96233 451905 0 0 3 0x14200 syncer update 92406 194788 0 0 3 0x14200 cleaner cleaner 55673 468263 0 0 3 0x14200 reaper reaper 89742 467123 0 0 3 0x14200 pgdaemon pagedaemon 77127 290170 0 0 3 0x14200 bored viomb 49049 160597 0 0 3 0x40014200 acpi0 acpi0 3575 225518 0 0 3 0x40014200 idle1 35290 181115 0 0 3 0x14200 bored softnet3 16562 12198 0 0 3 0x14200 bored softnet2 33914 210556 0 0 3 0x14200 bored softnet1 78636 324630 0 0 3 0x14200 bored softnet0 12864 180087 0 0 3 0x14200 bored systqmp 64802 61567 0 0 3 0x14200 bored systq 86823 265355 0 0 3 0x14200 tmoslp softclockmp 24896 83726 0 0 3 0x40014200 tmoslp softclock 7575 420969 0 0 3 0x40014200 idle0 1 317244 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 (0xffffffff839b78d0) #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 72808 (syz-executor) thread 0xffff8000ffff7730 (461645) exclusive rrwlock inode r = 0 (0xfffffd807daae968) #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 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3111 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806f13e530) #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3096 #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 Process 23625 (syz-executor) thread 0xffff8000ffff8538 (347414) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838ddd88) #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 (0xffffffff839b78d0) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10192 10951K 10966K 166960K 11278 0 pcb 17 12K 12K 166960K 17 0 rtable 196 5K 7K 166960K 370 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 1K 166960K 1 0 counters 60 35K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 35 0 iov 0 0K 18K 166960K 20 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1333 84K 84K 166960K 1560 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 20 70K 121K 166960K 488 0 sigio 0 0K 0K 166960K 144 0 proc 58 79K 115K 166960K 502 0 subproc 54 3K 4K 166960K 252 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 112 0 in_multi 77 5K 7K 166960K 111 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 133 599K 599K 166960K 133 0 exec 0 0K 1K 166960K 400 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 213 57K 83K 166960K 5479 0 UVM aobj 14 4K 5K 166960K 16 0 pinsyscall 43 86K 113K 166960K 1535 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 39 0 NDP 9 0K 2K 166960K 27 0 temp 36 8636K 8700K 166960K 5314 0 kqueue 14 22K 28K 166960K 75 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 120 124 0 121 2 0 2 2 0 8 1 rtentry 112 116 0 25 4 0 4 4 0 8 0 unpcb 144 418 0 398 4 0 4 4 0 8 3 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 184 0 175 7 3 4 7 0 8 3 arp 120 19 0 4 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 0 1 0 1 1 0 8 0 inpcb 376 426 0 413 8 3 5 8 0 8 3 nd6 136 28 0 8 1 0 1 1 0 8 0 kcovpl 48 28 0 22 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 461 0 92 29 0 29 29 0 8 4 art_table 32 462 0 92 4 0 4 4 0 8 0 art_node 16 115 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 6 1 0 1 1 0 8 0 semapl 112 16 0 6 1 0 1 1 0 8 0 shmpl 112 13 0 2 1 0 1 1 0 8 0 pool(0xffffffff839b78b8:shmpl): page inconsistency: page 0xfffffd806bf46000; 23 on list, 11 missing, 35 items per page dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 1977 0 449 96 0 96 96 0 8 0 ffsino 280 1977 0 449 110 0 110 110 0 8 0 nchpl 144 2532 0 835 63 0 63 63 0 8 0 uvmvnodes 80 2238 0 0 46 0 46 46 0 8 0 vnodes 216 2238 0 0 125 0 125 125 0 8 0 namei 1024 8321 0 8320 1 0 1 1 0 8 0 percpumem 16 46 0 2 1 0 1 1 0 8 0 kstatmem 264 22 0 4 2 0 2 2 0 8 0 scxspl 216 8506 0 8505 6 4 2 5 1 8 1 plimitpl 152 125 0 104 2 0 2 2 0 8 1 sigapl 424 733 0 681 8 1 7 8 0 8 0 futexpl 64 3972 0 3969 1 0 1 1 0 8 0 knotepl 120 362 0 0 11 0 11 11 0 8 0 kqueuepl 216 110 0 99 2 0 2 2 0 8 1 pipepl 328 195 0 167 3 0 3 3 0 8 0 fdescpl 504 714 0 681 7 1 6 6 0 8 1 filepl 152 4001 0 3796 12 0 12 12 0 8 3 lockfpl 104 77 0 74 1 0 1 1 0 8 0 lockfspl 48 36 0 33 1 0 1 1 0 8 0 sessionpl 144 44 0 29 1 0 1 1 0 8 0 pgrppl 48 80 0 58 1 0 1 1 0 8 0 ucredpl 104 507 0 490 1 0 1 1 0 8 0 zombiepl 144 683 0 681 1 0 1 1 0 8 0 processpl 1168 733 0 681 5 0 5 5 0 8 0 procpl 656 1189 0 1133 7 0 7 7 0 8 1 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 688 975 0 939 10 0 10 10 0 8 6 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 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 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 256 295 0 0 19 0 19 19 0 8 0 bufpl 280 2801 0 124 192 0 192 192 0 8 0 anonpl 24 150761 0 147556 58 0 58 58 0 184 28 amapchunkpl 152 17405 0 16936 30 0 30 30 0 158 8 amappl16 200 3455 0 3435 19 8 11 14 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 110 0 99 1 0 1 1 0 8 0 amappl13 176 21 0 21 2 1 1 1 0 8 1 amappl12 168 1321 0 1289 2 0 2 2 0 8 0 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 245 0 245 1 1 0 1 0 8 0 amappl8 136 22 0 21 1 0 1 1 0 8 0 amappl7 128 98 0 86 1 0 1 1 0 8 0 amappl6 120 176 0 172 1 0 1 1 0 8 0 amappl5 112 116 0 110 1 0 1 1 0 8 0 amappl4 104 301 0 286 1 0 1 1 0 8 0 amappl3 96 3183 0 3071 4 0 4 4 0 8 0 amappl2 88 659 0 597 2 0 2 2 0 8 0 amappl1 80 9362 0 8747 15 2 13 15 0 8 0 amappl 88 5071 0 4909 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 15 0 2 1 0 1 1 0 8 0 uaddrrnd 24 714 0 681 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 714 0 681 1 0 1 1 0 8 0 vmmpekpl 168 7969 0 7926 3 0 3 3 0 8 0 vmmpepl 168 51478 0 49579 102 1 101 102 0 357 13 vmsppl 456 713 0 681 7 1 6 6 0 8 1 rwobjpl 64 19894 0 16746 52 0 52 52 0 8 0 pdppl 4096 1435 0 1362 119 38 81 97 0 8 8 pvpl 32 16917 0 0 137 0 137 137 0 265 0 pmappl 248 713 0 681 4 1 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 313 0 44 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8383eff0) 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(ffffffff838ddb80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838ddb80) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800038cc4320,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff838ddb80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838ddb80) at __mp_lock+0x192 sys/kern/kern_lock.c:144 vn_closefile(fffffd8069d295f0,ffff8000ffff79c0) at vn_closefile+0x41 sys/kern/vfs_vnops.c:608 fdrop(fffffd8069d295f0,ffff8000ffff79c0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd8069d295f0,ffff8000ffff79c0) at closef+0x192 sys/kern/kern_descrip.c:1249 syscall(ffff800038cc4600) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038cc4600) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76ff31857260, count: 3 ddb{0}> trace x86_ipi_db(ffffffff8383eff0) 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(ffffffff838ddb80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838ddb80) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800038cc4320,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff838ddb80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838ddb80) at __mp_lock+0x192 sys/kern/kern_lock.c:144 vn_closefile(fffffd8069d295f0,ffff8000ffff79c0) at vn_closefile+0x41 sys/kern/vfs_vnops.c:608 fdrop(fffffd8069d295f0,ffff8000ffff79c0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd8069d295f0,ffff8000ffff79c0) at closef+0x192 sys/kern/kern_descrip.c:1249 syscall(ffff800038cc4600) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038cc4600) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76ff31857260, count: -12 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(ffffffff833ab8c1) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839b78b8,1,ffff80003c4fa878) at pool_do_get+0x5da pool_get(ffffffff839b78b8,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff8538,ffff80003c4faad0,150,ffff80003c4faa20) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff8538,ffff80003c4faad0,ffff80003c4faa20) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c4faad0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4faad0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc95cb8e1f0, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ab8c1) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839b78b8,1,ffff80003c4fa878) at pool_do_get+0x5da pool_get(ffffffff839b78b8,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff8538,ffff80003c4faad0,150,ffff80003c4faa20) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff8538,ffff80003c4faad0,ffff80003c4faa20) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c4faad0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4faad0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdc95cb8e1f0, count: -8