panic: pool_do_get: shmpl free list modified: page 0xfffffd806704f000; item addr 0xfffffd806704fbd0; offset 0x40=0x695ec46e Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 341280 88941 32767 0x10 0 0 syz-executor *228628 90071 32767 0x10 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ad039) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838bc7f8,1,ffff80002f7c2b08) at pool_do_get+0x5df pool_get(ffffffff838bc7f8,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7778,ffff80002f7c2d60,114,ffff80002f7c2cb0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7778,ffff80002f7c2d60,ffff80002f7c2cb0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f7c2d60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f7c2d60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x64f41069280, 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 0xfffffd806704f000; item addr 0xfffffd806704fbd0; offset 0x40=0x695ec46e ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ad039) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838bc7f8,1,ffff80002f7c2b08) at pool_do_get+0x5df pool_get(ffffffff838bc7f8,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7778,ffff80002f7c2d60,114,ffff80002f7c2cb0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7778,ffff80002f7c2d60,ffff80002f7c2cb0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f7c2d60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f7c2d60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x64f41069280, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002f7c2930 rbx 0xffff8000299dee07 rdx 0xffff80000156e200 rcx 0xffff8000fffe7778 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xd6f511cdad91e7f4 r11 0x817358c9122666c1 r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff82e0ffb5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002f7c2920 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=228628 pid=90071 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=69, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffee7e0,0xffff8000fffe67f8 process=0xffff80003c40eb70 user=0xffff80002f7bd000, vmspace=0xfffffd80713ac5e8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 88941 341280 22161 32767 7 0x10 syz-executor 88941 309673 22161 32767 3 0x4000090 fsleep syz-executor 90071 332093 69183 32767 2 0x10 syz-executor *90071 228628 69183 32767 7 0x4000010 syz-executor 77832 270249 88726 32767 3 0x90 nanoslp syz-executor 77832 491090 88726 32767 3 0x4000090 sbwait syz-executor 77832 126103 88726 32767 3 0x4000090 fsleep syz-executor 53157 32949 13328 32767 3 0x90 nanoslp syz-executor 53157 45803 13328 32767 3 0x4000090 kqpoll syz-executor 53157 319254 13328 32767 3 0x4000090 fsleep syz-executor 53157 148629 13328 32767 3 0x4000090 fsleep syz-executor 99108 222494 64113 32767 3 0x90 nanoslp syz-executor 38876 287839 8643 32767 3 0x10 biowait syz-executor 88726 466389 50626 32767 3 0x90 nanoslp syz-executor 84074 275664 5322 32767 3 0x90 nanoslp syz-executor 69183 189744 51567 32767 3 0x90 nanoslp syz-executor 13328 523436 57348 32767 3 0x90 nanoslp syz-executor 25298 438262 71147 32767 2 0x10000010 syz-executor 22161 413457 15613 32767 3 0x90 nanoslp syz-executor 64113 315191 13811 0 3 0x82 wait syz-executor 51567 73113 13811 0 3 0x82 wait syz-executor 8643 343654 13811 0 3 0x82 wait syz-executor 50626 30019 13811 0 3 0x82 wait syz-executor 15613 423907 13811 0 3 0x82 wait syz-executor 57348 468016 13811 0 3 0x82 wait syz-executor 71147 515692 13811 0 3 0x82 wait syz-executor 5322 8711 13811 0 3 0x82 wait syz-executor 13811 420033 10586 0 3 0x82 kqread syz-executor 10586 201517 72315 0 3 0x10008a sigsusp ksh 72315 23173 33325 0 3 0x98 kqread sshd-session 33325 119891 93086 0 3 0x92 kqread sshd-session 30351 262305 1 0 3 0x100083 ttyin getty 93086 404082 1 0 3 0x88 kqread sshd 31312 51314 52356 73 3 0x1100090 kqread syslogd 52356 486625 1 0 3 0x100082 sbwait syslogd 29782 20413 1 0 3 0x100080 kqread resolvd 92830 194096 88684 77 3 0x100092 kqread dhcpleased 13555 290421 88684 77 3 0x100092 kqread dhcpleased 88684 392202 1 0 3 0x80 kqread dhcpleased 58986 20359 0 0 3 0x14200 bored smr 18394 92396 0 0 2 0x14200 zerothread 64039 181334 0 0 3 0x14200 aiodoned aiodoned 71338 45274 0 0 3 0x14200 syncer update 39713 103218 0 0 3 0x14200 cleaner cleaner 47430 273630 0 0 3 0x14200 reaper reaper 46368 178531 0 0 3 0x14200 pgdaemon pagedaemon 75659 455392 0 0 3 0x14200 bored viomb 42047 471877 0 0 3 0x40014200 acpi0 acpi0 3777 313307 0 0 3 0x40014200 idle1 63977 275036 0 0 3 0x14200 bored softnet1 9937 316115 0 0 2 0x14200 softnet0 50372 343280 0 0 3 0x14200 bored systqmp 41968 102881 0 0 3 0x14200 bored systq 11187 508421 0 0 3 0x14200 tmoslp softclockmp 39690 382305 0 0 3 0x40014200 tmoslp softclock 76850 189329 0 0 3 0x40014200 idle0 1 98751 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 (0xffffffff838bc810) #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 88941 (syz-executor) thread 0xffff8000fffe67e8 (341280) exclusive rwlock uobjlk r = 0 (0xfffffd806dc30a50) #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 uvm_fault+0x1e5 sys/uvm/uvm_fault.c:649 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd80713acab8) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #7 recall_trap+0x8 Process 90071 (syz-executor) thread 0xffff8000fffe7778 (228628) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838fd5c8) #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 (0xffffffff838bc810) #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 38876 (syz-executor) thread 0xffff8000fffe6a80 (287839) exclusive rrwlock inode r = 0 (0xfffffd8067aa0208) #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:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d32f0d0) #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:570 #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:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11054 12019K 12034K 166960K 12145 0 pcb 17 12K 12K 166960K 17 0 rtable 239 6K 7K 166960K 416 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 5 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 29 0 iov 0 0K 12K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1361 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 6 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 125K 166960K 185 0 sigio 0 0K 0K 166960K 2 0 proc 58 99K 147K 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 5 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 354 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 250 160K 174K 166960K 3386 0 UVM aobj 5 2K 3K 166960K 6 0 pinsyscall 45 90K 112K 166960K 1233 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 2 0 NDP 11 0K 2K 166960K 27 0 temp 36 8666K 8730K 166960K 3925 0 kqueue 14 22K 24K 166960K 32 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 40 0 37 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 62 0 41 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 28 0 20 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 328 101 0 88 2 0 2 2 0 8 0 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 256 454 0 0 29 0 29 29 0 8 0 art_table 40 455 0 0 5 0 5 5 0 8 0 art_node 32 112 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 112 4 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 1 1 0 1 1 0 8 0 pool(0xffffffff838bc7f8:shmpl): page inconsistency: page 0xfffffd806704f000; 32 on list, 2 missing, 35 items per page dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1618 0 111 95 0 95 95 0 8 0 ffsino 296 1618 0 111 117 0 117 117 0 8 0 nchpl 144 1858 0 170 63 0 63 63 0 8 0 vnodes 216 1699 0 0 95 0 95 95 0 8 0 namei 1024 5527 0 5526 2 0 2 2 0 8 1 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 6060 0 6059 3 1 2 2 1 8 1 plimitpl 152 111 0 86 2 0 2 2 0 8 0 sigapl 424 467 0 414 7 0 7 7 0 8 0 knotepl 120 63 0 0 2 0 2 2 0 8 0 kqueuepl 224 30 0 20 1 0 1 1 0 8 0 pipepl 344 113 0 86 3 0 3 3 0 8 0 fdescpl 528 451 0 415 4 0 4 4 0 8 0 filepl 160 1705 0 1480 12 0 12 12 0 8 2 lockfpl 104 14 0 12 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 31 0 7 1 0 1 1 0 8 0 ucredpl 104 195 0 176 1 0 1 1 0 8 0 zombiepl 144 417 0 414 1 0 1 1 0 8 0 processpl 1232 467 0 414 5 0 5 5 0 8 0 procpl 664 548 0 488 6 0 6 6 0 8 0 sockpl 752 203 0 166 5 0 5 5 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 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 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 51 0 0 7 0 7 7 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 240 0 0 15 0 15 15 0 8 0 bufpl 280 2303 0 118 157 0 157 157 0 8 0 anonpl 32 6633 0 0 54 0 54 54 0 246 0 amapchunkpl 152 10054 0 9524 32 0 32 32 0 158 6 amappl16 200 1909 0 1891 5 0 5 5 0 8 3 amappl15 192 9 0 9 1 0 1 1 0 8 1 amappl14 184 13 0 13 1 0 1 1 0 8 1 amappl13 176 397 0 396 1 0 1 1 0 8 0 amappl12 168 785 0 740 3 0 3 3 0 8 0 amappl11 160 10 0 10 1 0 1 1 0 8 1 amappl10 152 51 0 41 1 0 1 1 0 8 0 amappl9 144 246 0 246 1 0 1 1 0 8 1 amappl8 136 31 0 30 1 0 1 1 0 8 0 amappl7 128 105 0 104 1 0 1 1 0 8 0 amappl6 120 260 0 249 1 0 1 1 0 8 0 amappl5 112 77 0 70 1 0 1 1 0 8 0 amappl4 104 378 0 354 1 0 1 1 0 8 0 amappl3 96 1486 0 1388 3 0 3 3 0 8 0 amappl2 88 575 0 499 2 0 2 2 0 8 0 amappl1 80 9399 0 8847 15 0 15 15 0 8 0 amappl 88 2692 0 2512 5 0 5 5 0 92 0 uvmvnodes 80 97 0 0 2 0 2 2 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 5 0 1 1 0 1 1 0 8 0 uaddrrnd 24 451 0 415 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 451 0 415 1 0 1 1 0 8 0 vmmpekpl 168 5484 0 5452 2 0 2 2 0 8 0 vmmpepl 168 37365 0 35377 100 1 99 99 0 357 4 vmsppl 488 450 0 415 7 1 6 6 0 8 0 rwobjpl 80 13799 0 12873 23 0 23 23 0 8 0 pdppl 4096 909 0 830 107 18 89 97 0 8 10 pvpl 32 13509 0 0 109 0 109 109 0 265 0 pmappl 256 450 0 415 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 286 0 21 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8382eff0) 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(ffffffff838fd3c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838fd3c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c415180,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff838fd3c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838fd3c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(fffffd80713ac9b8,d90365af000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80003c415520,d90365af000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c415520) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7afad19ab280, count: 4 ddb{0}> trace x86_ipi_db(ffffffff8382eff0) 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(ffffffff838fd3c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838fd3c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c415180,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff838fd3c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838fd3c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(fffffd80713ac9b8,d90365af000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80003c415520,d90365af000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c415520) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7afad19ab280, count: -11 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(ffffffff833ad039) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838bc7f8,1,ffff80002f7c2b08) at pool_do_get+0x5df pool_get(ffffffff838bc7f8,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7778,ffff80002f7c2d60,114,ffff80002f7c2cb0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7778,ffff80002f7c2d60,ffff80002f7c2cb0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f7c2d60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f7c2d60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x64f41069280, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ad039) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838bc7f8,1,ffff80002f7c2b08) at pool_do_get+0x5df pool_get(ffffffff838bc7f8,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000fffe7778,ffff80002f7c2d60,114,ffff80002f7c2cb0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000fffe7778,ffff80002f7c2d60,ffff80002f7c2cb0) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f7c2d60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f7c2d60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x64f41069280, count: -8