kernel: protection fault trap, code=0 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%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(ffff80003c45dcb0,ffff80003c499880,ffff80003c4997d0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c499880) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c499880) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8862f66acc0, count: -3 ddb{1}> show registers rdi 0 rsi 0xb rbp 0xffff80003c4997a0 rbx 0xdeafbeaddeafbead rdx 0 rcx 0xffff80003c45dcb0 rax 0xffff8000299fdff0 r8 0x7f7fffffc000 r9 0x1 r10 0x17880a28afba9295 r11 0x4554819ed526616e r12 0xb r13 0xfffffd806b965930 r14 0xffff80003c499880 r15 0xb rip 0xffffffff82c555c2 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c4996b0 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=206682 pid=22614 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000344194e0,0xffff80003c45cd30 process=0xffff8000380366a0 user=0xffff80003c494000, vmspace=0xfffffd806b7a8d78 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 22614 266447 5076 0 3 0x80 nanoslp syz-executor *22614 206682 5076 0 7 0x4000000 syz-executor 22614 25935 5076 0 3 0x4000080 fsleep syz-executor 22614 208590 5076 0 3 0x4000080 fsleep syz-executor 22586 204959 98579 0 2 0 syz-executor 22586 12077 98579 0 3 0x4000080 fsleep syz-executor 97619 233658 46995 0 2 0 syz-executor 97619 197489 46995 0 3 0x4000080 fsleep syz-executor 17407 471583 21041 0 2 0 syz-executor 17407 437636 21041 0 3 0x4000000 biowait syz-executor 36356 11621 87894 0 2 0 syz-executor 36356 271763 87894 0 3 0x4000080 fsleep syz-executor 29702 405900 58453 0 2 0 syz-executor 29702 257778 58453 0 7 0x4000000 syz-executor 29702 242744 58453 0 3 0x4000080 fsleep syz-executor 731 522512 13707 0 2 0 syz-executor 731 459918 13707 0 3 0x4000080 bell syz-executor 731 211807 13707 0 2 0x4000000 syz-executor 88803 23987 55945 0 2 0 syz-executor 88803 231610 55945 0 3 0x4000080 sbwait syz-executor 88803 318759 55945 0 2 0x4000000 syz-executor 70904 523122 0 0 3 0x14200 acct acct 34133 447716 0 0 3 0x14200 bored sosplice 55945 182612 36392 0 3 0x82 nanoslp syz-executor 98579 482749 36392 0 3 0x82 nanoslp syz-executor 21041 344040 36392 0 3 0x82 nanoslp syz-executor 87894 46381 36392 0 3 0x82 nanoslp syz-executor 5076 298569 36392 0 3 0x82 nanoslp syz-executor 46995 185908 36392 0 3 0x82 nanoslp syz-executor 58453 66819 36392 0 3 0x82 nanoslp syz-executor 13707 146486 36392 0 3 0x82 nanoslp syz-executor 36392 129731 42218 0 3 0x82 kqread syz-executor 42218 451014 41636 0 3 0x10008a sigsusp ksh 41636 422450 5403 0 3 0x98 kqread sshd-session 5403 485821 55620 0 3 0x92 kqread sshd-session 68619 280398 1 0 3 0x100083 ttyopn getty 55620 186993 1 0 3 0x88 kqread sshd 64155 242743 10002 74 3 0x1100092 bpf pflogd 10002 374837 1 0 3 0x80 sbwait pflogd 97267 279235 30852 73 3 0x1100090 kqread syslogd 30852 387671 1 0 3 0x100082 sbwait syslogd 97346 193378 1 0 3 0x100080 kqread resolvd 54816 429917 87267 77 3 0x100092 kqread dhcpleased 6020 418433 87267 77 3 0x100092 kqread dhcpleased 87267 87689 1 0 3 0x80 kqread dhcpleased 45053 378760 0 0 3 0x14200 bored smr 48985 288271 0 0 2 0x14200 zerothread 60343 272448 0 0 3 0x14200 aiodoned aiodoned 53698 306134 0 0 3 0x14200 syncer update 29876 501456 0 0 3 0x14200 cleaner cleaner 54706 393955 0 0 3 0x14200 reaper reaper 76846 47248 0 0 3 0x14200 pgdaemon pagedaemon 76686 272489 0 0 3 0x14200 bored viomb 89793 212769 0 0 3 0x40014200 acpi0 acpi0 54226 394179 0 0 3 0x40014200 idle1 65282 10529 0 0 3 0x14200 bored softnet7 44105 70209 0 0 3 0x14200 bored softnet6 14601 379551 0 0 3 0x14200 bored softnet5 26471 442217 0 0 3 0x14200 bored softnet4 19363 519030 0 0 3 0x14200 bored softnet3 98686 393552 0 0 3 0x14200 bored softnet2 54376 280216 0 0 3 0x14200 bored softnet1 54107 388227 0 0 3 0x14200 bored softnet0 13905 487010 0 0 3 0x14200 bored systqmp 74593 307427 0 0 3 0x14200 bored systq 16490 358573 0 0 3 0x14200 tmoslp softclockmp 75776 415506 0 0 3 0x40014200 tmoslp softclock 51701 137391 0 0 3 0x40014200 idle0 1 242780 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 22614 (syz-executor) thread 0xffff80003c45dcb0 (206682) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838e36d0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 malloc+0xe3 sys/kern/kern_malloc.c:174 #3 sys_semop+0x22f sys/kern/sysv_sem.c:-1 #4 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #5 Xsyscall+0x128 Process 17407 (syz-executor) thread 0xffff800034419778 (437636) exclusive rrwlock inode r = 0 (0xfffffd8072fca208) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 Process 29702 (syz-executor) thread 0xffff8000344187e8 (257778) exclusive rrwlock inode r = 0 (0xfffffd8072fca0e0) #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+0xa3 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 ufs_lookup+0x16bd sys/ufs/ufs/ufs_lookup.c:573 #7 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #8 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #9 namei+0x7ca sys/kern/vfs_lookup.c:250 #10 vn_open+0x15a sys/kern/vfs_vnops.c:140 #11 sys_acct+0xb9 sys/kern/kern_acct.c:121 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e8286d0) #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+0xa3 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 vn_open+0x15a sys/kern/vfs_vnops.c:140 #8 sys_acct+0xb9 sys/kern/kern_acct.c:121 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #10 Xsyscall+0x128 Process 88803 (syz-executor) thread 0xffff800034418020 (318759) exclusive rwlock vmmaplk r = 0 (0xfffffd806b7a88c0) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1918 #4 uvm_fault_check+0x895 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x895 sys/uvm/uvm_fault.c:784 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #7 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #8 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10238 11032K 11412K 166960K 12190 0 pcb 18 15K 16K 166960K 106 0 rtable 199 7K 7K 166960K 346 0 pf 35 17K 81K 166960K 94 0 ifaddr 37 6K 7K 166960K 65 0 ifgroup 55 2K 2K 166960K 107 0 sysctl 4 1K 9K 166960K 75 0 counters 68 36K 37K 166960K 106 0 ioctlops 0 0K 4K 166960K 1700 0 iov 0 0K 16K 166960K 22 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1400 88K 88K 166960K 1851 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 32 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 609 0 sigio 0 0K 0K 166960K 13 0 proc 72 115K 164K 166960K 583 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 0 0K 0K 166960K 71 0 in_multi 77 5K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 446 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 242 167K 177K 166960K 7250 0 UVM aobj 12 2K 2K 166960K 13 0 pinsyscall 43 86K 104K 166960K 1692 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 65 0 NDP 12 0K 2K 166960K 43 0 temp 60 8647K 8713K 166960K 24553 0 kqueue 14 22K 31K 166960K 101 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 68 0 65 1 0 1 1 0 8 0 rtentry 176 110 0 26 5 0 5 5 0 8 0 unpcb 144 476 0 457 2 0 2 2 0 8 1 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 133 0 128 1 0 1 1 0 8 0 arp 128 12 0 2 1 0 1 1 0 8 0 inpcb 328 783 0 772 15 11 4 12 0 8 3 nd6 144 18 0 4 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 11 0 11 1 0 1 1 0 8 1 pppxif 1504 3 0 3 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 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 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfstitem 24 49 0 13 1 0 1 1 0 8 0 pfstkey 128 51 0 15 2 0 2 2 0 8 0 pfstate 384 50 0 15 5 0 5 5 0 8 0 pfrule 1344 25 0 19 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 490 0 96 28 1 27 28 0 8 2 art_table 40 493 0 96 5 0 5 5 0 8 0 art_node 32 109 0 35 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 12 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 29 0 20 1 0 1 1 0 8 0 shmpl 112 10 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2503 0 995 95 0 95 95 0 8 0 ffsino 296 2503 0 995 117 0 117 117 0 8 0 nchpl 144 3346 0 1657 63 0 63 63 0 8 0 uvmvnodes 80 2872 0 0 59 0 59 59 0 8 0 vnodes 216 2872 0 0 160 0 160 160 0 8 0 namei 1024 11658 0 11657 1 0 1 1 0 8 0 percpumem 16 68 0 19 1 0 1 1 0 8 0 kstatmem 264 58 0 30 3 0 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 6 0 6 2 1 1 1 0 8 1 scxspl 216 15129 0 15128 13 5 8 8 1 8 7 plimitpl 152 197 0 180 1 0 1 1 0 8 0 sigapl 424 914 0 858 7 0 7 7 0 8 0 knotepl 120 340 0 0 11 0 11 11 0 8 0 kqueuepl 224 204 0 193 4 1 3 3 0 8 2 pipepl 344 152 0 125 3 0 3 3 0 8 0 fdescpl 528 890 0 858 3 0 3 3 0 8 0 filepl 160 5608 0 5387 21 6 15 16 0 8 5 lockfpl 104 574 0 570 3 1 2 2 0 8 1 lockfspl 48 215 0 211 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 38 0 21 1 0 1 1 0 8 0 ucredpl 104 919 0 906 1 0 1 1 0 8 0 zombiepl 144 932 0 932 1 0 1 1 0 8 1 processpl 1232 914 0 858 5 0 5 5 0 8 0 procpl 664 1770 0 1701 7 1 6 7 0 8 0 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 752 1376 0 1343 24 14 10 16 0 8 6 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 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 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 14 0 0 1 0 1 1 0 8 0 mbufpl 256 193 0 0 13 0 13 13 0 8 0 bufpl 280 7013 0 869 440 0 440 440 0 8 0 anonpl 32 11440 0 0 93 0 93 93 0 246 0 amapchunkpl 152 22956 0 22442 30 8 22 26 0 158 2 amappl16 200 3564 0 3521 31 25 6 27 0 8 0 amappl15 192 47 0 47 2 2 0 1 0 8 0 amappl14 184 111 0 99 1 0 1 1 0 8 0 amappl13 176 4 0 3 1 0 1 1 0 8 0 amappl12 168 1529 0 1497 4 1 3 3 0 8 0 amappl11 160 86 0 72 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 293 0 293 1 1 0 1 0 8 0 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 109 0 97 1 0 1 1 0 8 0 amappl6 120 202 0 197 1 0 1 1 0 8 0 amappl5 112 139 0 129 1 0 1 1 0 8 0 amappl4 104 311 0 293 1 0 1 1 0 8 0 amappl3 96 4573 0 4453 4 0 4 4 0 8 0 amappl2 88 645 0 582 2 0 2 2 0 8 0 amappl1 80 10532 0 9916 15 0 15 15 0 8 0 amappl 88 6488 0 6318 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 2 2 0 1 0 8 0 dma64 64 7 0 7 2 2 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 12 0 1 1 0 1 1 0 8 0 uaddrrnd 24 890 0 858 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 890 0 858 1 0 1 1 0 8 0 vmmpekpl 168 8744 0 8712 2 0 2 2 0 8 0 vmmpepl 168 62940 0 60877 110 15 95 110 0 357 1 vmsppl 488 889 0 858 5 1 4 5 0 8 0 rwobjpl 80 22147 0 18308 80 0 80 80 0 8 0 pdppl 4096 1787 0 1716 103 32 71 85 0 8 0 pvpl 32 17447 0 0 142 1 141 141 0 265 0 pmappl 256 889 0 858 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 276 0 37 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8385dff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff838e34c8) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838e34c8) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff80003c46e990,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1 __mp_lock(ffffffff838e34c8) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838e34c8) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff838e34c8,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 malloc(38,19,1) at malloc+0xe3 sys/kern/kern_malloc.c:174 checkalias(fffffd806b7342a0,800,ffff800000b4a800) at checkalias+0x21c sys/kern/vfs_subr.c:601 ffs_vinit(ffff800000b4a800,ffff80003c46ecb0) at ffs_vinit+0x111 sys/ufs/ffs/ffs_subr.c:-1 ffs_vget(ffff800000b4a800,cb05,ffff80003c46ed80) at ffs_vget+0x40e sys/ufs/ffs/ffs_vfsops.c:1285 ufs_lookup() at ufs_lookup+0x16bd sys/ufs/ufs/ufs_lookup.c:573 VOP_LOOKUP(fffffd80656eb010,ffff80003c46f128,ffff80003c46f158) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80003c46f0f8) at vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 namei(ffff80003c46f0f8) at namei+0x7ca sys/kern/vfs_lookup.c:250 vn_open(ffff80003c46f0f8,a,0) at vn_open+0x15a sys/kern/vfs_vnops.c:140 sys_acct(ffff8000344187e8,ffff80003c46f2d0,ffff80003c46f220) at sys_acct+0xb9 sys/kern/kern_acct.c:121 syscall(ffff80003c46f2d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c46f2d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5bddc24c8a0, count: -22 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff80003c45dcb0,ffff80003c499880,ffff80003c4997d0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c499880) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c499880) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8862f66acc0, count: -3