login: kernel: protection fault trap, code=0 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace sys_semop(ffff8000ffff22a8,ffff800033398ef0,ffff800033398e40) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff800033398ef0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800033398ef0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5ac6bf98510, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800033398e10 rbx 0 rdx 0 rcx 0xffff8000ffff22a8 rax 0xdeaf4152deaf4152 r8 0x7f7fffffc000 r9 0x1 r10 0x387ba8ea39d2f444 r11 0x55d33e4ba282a560 r12 0xffff800001346704 r13 0 r14 0xffff800033398ef0 r15 0 rip 0xffffffff81579d7b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800033398cf0 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=230672 pid=60670 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=76, usrpri=76, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff3460,0xffff8000ffff36f8 process=0xffff8000ffff6458 user=0xffff800033393000, vmspace=0xfffffd806bf26e20 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 42018 61050 1331 0 2 0 syz-executor 42018 401243 1331 0 3 0x4000000 biowait syz-executor 60670 190596 72135 0 2 0 syz-executor *60670 230672 72135 0 7 0x4000000 syz-executor 60670 77609 72135 0 3 0x4000000 futex syz-executor 30719 255122 43935 0 3 0 futex syz-executor 30719 102284 43935 0 3 0x4000080 fsleep syz-executor 30719 249543 43935 0 3 0x4000080 fsleep syz-executor 73380 464318 21195 0 2 0 syz-executor 73380 193603 21195 0 2 0x4000000 syz-executor 73380 366937 21195 0 3 0x4000080 fsleep syz-executor 66832 227602 65917 0 2 0 syz-executor 66832 183527 65917 0 2 0x4000000 syz-executor 82807 84888 31019 0 2 0x10 syz-executor 82807 49383 31019 0 3 0x4000090 pipewr syz-executor 82807 274949 31019 0 3 0x4000010 futex syz-executor 82807 401010 31019 0 3 0x4000090 fsleep syz-executor 8930 507565 1 0 3 0x100083 ttyin getty 99229 115201 0 0 3 0x14200 bored sosplice 21195 453952 13723 0 3 0x82 nanoslp syz-executor 1331 167374 13723 0 3 0x82 nanoslp syz-executor 80319 294574 13723 0 2 0x2 syz-executor 72135 434281 13723 0 3 0x82 nanoslp syz-executor 95258 109410 13723 0 3 0x82 nanoslp syz-executor 65917 489491 13723 0 3 0x82 nanoslp syz-executor 31019 371734 13723 0 3 0x82 nanoslp syz-executor 43935 175815 13723 0 3 0x82 nanoslp syz-executor 13723 44159 87386 0 3 0x82 kqread syz-executor 87386 28711 71596 0 3 0x10008a sigsusp ksh 71596 474970 87175 0 3 0x98 kqread sshd-session 87175 212631 46835 0 3 0x92 kqread sshd-session 46835 504611 1 0 3 0x88 kqread sshd 90855 14638 33780 74 3 0x1100092 bpf pflogd 33780 63577 1 0 3 0x80 sbwait pflogd 47680 241577 22773 73 3 0x1100090 kqread syslogd 22773 52229 1 0 3 0x100082 sbwait syslogd 2711 180659 1 0 3 0x100080 kqread resolvd 29263 307693 56468 77 3 0x100092 kqread dhcpleased 67656 504758 56468 77 3 0x100092 kqread dhcpleased 56468 187504 1 0 3 0x80 kqread dhcpleased 42939 357393 0 0 3 0x14200 bored smr 46144 217887 0 0 3 0x14200 pgzero zerothread 37481 410840 0 0 3 0x14200 aiodoned aiodoned 57271 58675 0 0 3 0x14200 syncer update 2308 36322 0 0 3 0x14200 cleaner cleaner 83324 360628 0 0 3 0x14200 reaper reaper 82489 291012 0 0 3 0x14200 pgdaemon pagedaemon 74057 272991 0 0 3 0x14200 bored viomb 99895 435038 0 0 3 0x40014200 acpi0 acpi0 14290 262704 0 0 3 0x40014200 idle1 21574 94942 0 0 3 0x14200 bored softnet3 51372 494598 0 0 3 0x14200 bored softnet2 77680 507007 0 0 3 0x14200 bored softnet1 59081 423475 0 0 3 0x14200 bored softnet0 54482 49142 0 0 3 0x14200 bored systqmp 82287 312684 0 0 3 0x14200 bored systq 74837 363706 0 0 3 0x14200 tmoslp softclockmp 68159 62351 0 0 3 0x40014200 tmoslp softclock 24995 420843 0 0 3 0x40014200 idle0 1 510939 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 42018 (syz-executor) thread 0xffff8000ffff31d8 (401243) exclusive rrwlock inode r = 0 (0xfffffd80602244e8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:169 #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_makeinode+0xcb sys/ufs/ufs/ufs_vnops.c:1732 #8 ufs_create+0x4e sys/ufs/ufs/ufs_vnops.c:147 #9 VOP_CREATE+0xff sys/kern/vfs_vops.c:103 #10 uipc_bind+0x418 sys/kern/uipc_usrreq.c:391 #11 sys_bind+0x28a sys/kern/uipc_syscalls.c:189 #12 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #12 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8060224928) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 uipc_bind+0x2f4 sys/kern/uipc_usrreq.c:369 #8 sys_bind+0x28a sys/kern/uipc_syscalls.c:189 #9 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #9 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #10 Xsyscall+0x128 Process 60670 (syz-executor) thread 0xffff8000ffff22a8 (230672) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8363b0f8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 __mp_acquire_count+0x58 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 malloc+0xe5 sys/kern/kern_malloc.c:170 #5 sys_semop+0x234 sys/kern/sysv_sem.c:564 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 73380 (syz-executor) thread 0xffff8000ffff0f58 (193603) exclusive rwlock futex r = 0 (0xffffffff834a16d0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 sys_futex+0x69 sys/kern/sys_futex.c:98 #2 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #2 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #3 Xsyscall+0x128 Process 66832 (syz-executor) thread 0xffff8000ffff1c00 (183527) exclusive rwlock netlock r = 0 (0xffffffff83437b80) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 in6_ioctl_change_ifaddr+0x10a #2 ifioctl+0x1571 pru_control sys/sys/protosw.h:352 [inline] #2 ifioctl+0x1571 sys/net/if.c:2447 #3 sys_ioctl+0x67c #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 Process 80319 (syz-executor) thread 0xffff800029fd8290 (294574) exclusive rrwlock inode r = 0 (0xfffffd8060224c58) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:169 #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:3099 #10 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #10 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ce424d8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #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:3084 #8 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #8 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10204 11143K 11585K 166960K 11526 0 pcb 20 12K 12K 166960K 59 0 rtable 235 7K 7K 166960K 384 0 pf 36 18K 18K 166960K 57 0 ifaddr 43 7K 7K 166960K 55 0 ifgroup 58 2K 2K 166960K 68 0 sysctl 2 0K 0K 166960K 2 0 counters 64 36K 36K 166960K 74 0 ioctlops 0 0K 4K 166960K 1495 0 iov 0 0K 16K 166960K 43 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1370 86K 87K 166960K 1661 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 9 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 93K 166960K 315 0 sigio 1 0K 0K 166960K 4 0 proc 72 91K 140K 166960K 552 0 subproc 104 6K 6K 166960K 104 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 22 0 in_multi 95 7K 7K 166960K 113 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 382 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 240 73K 77K 166960K 4662 0 UVM aobj 9 2K 2K 166960K 10 0 pinsyscall 42 84K 105K 166960K 1403 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 16 0 NDP 12 0K 2K 166960K 35 0 temp 43 6819K 6884K 166960K 5638 0 kqueue 13 20K 28K 166960K 52 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 44 0 41 1 0 1 1 0 8 0 rtentry 112 120 0 11 4 0 4 4 0 8 0 unpcb 144 202 0 175 1 0 1 1 0 8 0 syncache 336 4 0 4 3 2 1 1 0 8 1 tcpcb 808 136 0 132 7 0 7 7 0 8 6 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 336 348 0 338 8 1 7 7 0 8 5 nd6 136 29 0 5 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 5 0 5 1 0 1 1 0 8 1 pffrag 232 2 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 1 1 0 1 1 0 8 0 pffrent 40 4 0 3 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 37 0 0 1 0 1 1 0 8 0 pfstkey 128 37 0 0 2 0 2 2 0 8 0 pfstate 376 37 0 0 4 0 4 4 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 503 0 62 29 0 29 29 0 8 1 art_table 32 504 0 62 4 0 4 4 0 8 0 art_node 16 119 0 19 1 0 1 1 0 8 0 semapl 112 6 0 1 1 0 1 1 0 8 0 shmpl 112 7 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2028 0 522 95 0 95 95 0 8 0 ffsino 272 2028 0 522 102 0 102 102 0 8 0 nchpl 144 2469 0 780 63 0 63 63 0 8 0 uvmvnodes 80 2242 0 0 46 0 46 46 0 8 0 vnodes 216 2242 0 0 125 0 125 125 0 8 0 namei 1024 8974 0 8972 3 2 1 2 0 8 0 percpumem 16 51 0 5 1 0 1 1 0 8 0 kstatmem 264 34 0 10 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 7346 0 7345 6 2 4 4 1 8 3 plimitpl 152 47 0 30 1 0 1 1 0 8 0 sigapl 424 619 0 569 7 1 6 7 0 8 0 futexpl 64 3036 0 3031 1 0 1 1 0 8 0 knotepl 120 345 0 0 11 0 11 11 0 8 0 kqueuepl 216 62 0 53 1 0 1 1 0 8 0 pipepl 320 129 0 100 3 0 3 3 0 8 0 fdescpl 496 600 0 569 5 0 5 5 0 8 0 filepl 152 3512 0 3242 17 4 13 15 0 8 2 lockfpl 104 53 0 49 1 0 1 1 0 8 0 lockfspl 48 25 0 21 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 582 0 568 1 0 1 1 0 8 0 zombiepl 144 632 0 631 1 0 1 1 0 8 0 processpl 1160 619 0 569 5 1 4 5 0 8 0 procpl 648 937 0 876 6 0 6 6 0 8 0 srpgc 96 1 0 1 1 0 1 1 0 8 1 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 664 595 0 555 10 1 9 9 0 8 5 mcl64k 65536 1 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 143 0 0 18 0 18 18 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 173 0 0 10 0 10 10 0 8 0 bufpl 280 2586 0 98 178 0 178 178 0 8 0 anonpl 24 180041 0 176558 57 23 34 54 0 185 3 amapchunkpl 152 15645 0 15141 26 1 25 25 0 158 3 amappl16 200 4667 0 4638 18 13 5 18 0 8 0 amappl15 192 14 0 14 1 1 0 1 0 8 0 amappl14 184 123 0 111 1 0 1 1 0 8 0 amappl13 176 13 0 13 1 1 0 1 0 8 0 amappl12 168 1251 0 1220 4 1 3 3 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 22 0 21 1 0 1 1 0 8 0 amappl9 144 133 0 133 1 1 0 1 0 8 0 amappl8 136 23 0 21 1 0 1 1 0 8 0 amappl7 128 138 0 126 1 0 1 1 0 8 0 amappl6 120 168 0 167 1 0 1 1 0 8 0 amappl5 112 137 0 126 1 0 1 1 0 8 0 amappl4 104 311 0 293 1 0 1 1 0 8 0 amappl3 96 2824 0 2727 3 0 3 3 0 8 0 amappl2 88 876 0 792 3 0 3 3 0 8 1 amappl1 80 8373 0 7804 15 1 14 14 0 8 1 amappl 88 4273 0 4096 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 128 254 0 254 2 1 1 1 0 8 1 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 9 0 1 1 0 1 1 0 8 0 uaddrrnd 24 600 0 569 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 600 0 569 1 0 1 1 0 8 0 vmmpekpl 168 6462 0 6422 3 0 3 3 0 8 1 vmmpepl 168 46369 0 44497 99 10 89 98 0 357 3 vmsppl 448 599 0 569 6 2 4 5 0 8 0 rwobjpl 56 19902 0 16718 49 3 46 46 0 8 0 pdppl 4096 1207 0 1138 103 32 71 85 0 8 2 pvpl 32 16188 0 0 131 0 131 131 0 265 0 pmappl 248 599 0 569 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 398 0 41 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff834b9ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff8363aef0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8363aef0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800032f92a50,ffff800000079f80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff8363aef0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8363aef0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff8363aef0,1) at __mp_acquire_count+0x58 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 sleep_finish(0,1) at sleep_finish+0x2f2 sys/kern/kern_synch.c:425 msleep(ffff8000ffff7218,ffff8000ffff72f8,20,ffffffff830b1848,0) at msleep+0x13b sys/kern/kern_synch.c:251 exit1(ffff8000ffff0538,0,0,1) at exit1+0x35e sys/kern/kern_exit.c:179 sys_exit(ffff8000ffff0538,ffff800032f92e60,ffff800032f92db0) at sys_exit+0x1a syscall(ffff800032f92e60) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800032f92e60) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7010ad563f80, count: -15 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff8000ffff22a8,ffff800033398ef0,ffff800033398e40) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff800033398ef0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800033398ef0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5ac6bf98510, count: -3