kernel: protection fault trap, code=0 Stopped at sys_semop+0x3d5: 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(ffff80002a3eb4f0,ffff80003ac3dc40,ffff80003ac3db90) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003ac3dc40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac3dc40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17b94a37870, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003ac3db60 rbx 0xdeaf4152deaf415e rdx 0 rcx 0xffff80002a3eb4f0 rax 0xdeaf4152deaf415e r8 0x7f7fffffc000 r9 0x1 r10 0xc6f2f031d3db8dd6 r11 0xf8ddfe94d4c52f91 r12 0 r13 0xfffffd806b997c40 r14 0xffff80003ac3dc40 r15 0 rip 0xffffffff81994495 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003ac3da70 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=257075 pid=30622 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=80, usrpri=80, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003b890800,0xffff80002a3ebcc8 process=0xffff80003a8366a0 user=0xffff80003ac38000, vmspace=0xfffffd806b9c7b88 estcpu=30, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48183 54974 63607 0 7 0 syz-executor 48183 304768 63607 0 2 0x4000000 syz-executor 30622 331781 97184 0 2 0 syz-executor *30622 257075 97184 0 7 0x4000000 syz-executor 30622 9058 97184 0 3 0x4000080 fsleep syz-executor 34793 183033 0 0 3 0x14280 nfsidl nfsio 97377 491658 0 0 3 0x14280 nfsidl nfsio 16117 41453 0 0 3 0x14280 nfsidl nfsio 68272 167825 0 0 3 0x14280 nfsidl nfsio 11258 334577 0 0 3 0x14280 nfsidl nfsio 21186 127245 0 0 3 0x14280 nfsidl nfsio 82939 384143 0 0 3 0x14280 nfsidl nfsio 26203 186028 0 0 3 0x14280 nfsidl nfsio 72290 67335 0 0 3 0x14280 nfsidl nfsio 85802 141108 0 0 3 0x14280 nfsidl nfsio 82205 48389 0 0 3 0x14280 nfsidl nfsio 89322 350359 0 0 3 0x14280 nfsidl nfsio 2166 33536 0 0 3 0x14280 nfsidl nfsio 56330 346565 0 0 3 0x14280 nfsidl nfsio 97164 235371 0 0 3 0x14280 nfsidl nfsio 22265 330401 0 0 3 0x14280 nfsidl nfsio 26264 216029 0 0 3 0x14280 nfsidl nfsio 18246 304205 0 0 3 0x14280 nfsidl nfsio 29812 326748 0 0 3 0x14280 nfsidl nfsio 52194 395635 0 0 3 0x14280 nfsidl nfsio 3897 455758 56996 0 3 0x3000 suspend syz-executor 3897 292745 56996 0 3 0x4081000 biowait syz-executor 57696 98234 35688 0 4 0x82000 syz-executor 57696 111152 35688 0 3 0x4082000 biowait syz-executor 57696 251061 35688 0 3 0x4002000 suspend syz-executor 57696 111287 35688 0 4 0x4082000 syz-executor 58763 141912 8836 0 3 0x3000 suspend syz-executor 58763 463241 8836 0 3 0x4081000 biowait syz-executor 88108 319383 0 0 3 0x14200 acct acct 67302 299246 80334 0 3 0x2 biowait syz-executor 44089 334638 0 0 3 0x14200 bored sosplice 63607 3840 80334 0 3 0x82 nanoslp syz-executor 56996 331536 80334 0 3 0x82 nanoslp syz-executor 8836 312653 80334 0 3 0x82 wait syz-executor 35688 246924 80334 0 3 0x82 nanoslp syz-executor 45859 440828 80334 0 3 0x82 nanoslp syz-executor 2846 148999 80334 0 3 0x82 wait syz-executor 97184 248680 80334 0 3 0x82 nanoslp syz-executor 80334 49780 11765 0 3 0x82 nanoslp syz-executor 11765 152516 59432 0 3 0x10008a sigsusp ksh 59432 219058 61156 0 3 0x98 kqread sshd-session 61156 519294 71251 0 3 0x92 kqread sshd-session 18392 499758 1 0 3 0x100083 ttyin getty 71251 371970 1 0 3 0x88 kqread sshd 75678 252323 16797 74 3 0x1100092 bpf pflogd 16797 510994 1 0 3 0x80 sbwait pflogd 99437 136064 46600 73 3 0x1100090 kqread syslogd 46600 22061 1 0 3 0x100082 sbwait syslogd 43451 155222 1 0 3 0x100080 kqread resolvd 35846 293165 49627 77 3 0x100092 kqread dhcpleased 45695 10875 49627 77 3 0x100092 kqread dhcpleased 49627 50989 1 0 3 0x80 kqread dhcpleased 79102 244633 0 0 3 0x14200 bored smr 26050 207017 0 0 3 0x14200 pgzero zerothread 25933 308746 0 0 3 0x14200 aiodoned aiodoned 86404 46627 0 0 3 0x14200 syncer update 64113 349769 0 0 3 0x14200 cleaner cleaner 36702 158640 0 0 3 0x14200 reaper reaper 1245 94674 0 0 3 0x14200 pgdaemon pagedaemon 3917 496122 0 0 3 0x14200 bored viomb 18976 315433 0 0 3 0x40014200 acpi0 acpi0 8825 441161 0 0 3 0x40014200 idle1 40755 3631 0 0 3 0x14200 bored softnet7 42819 152357 0 0 3 0x14200 bored softnet6 67833 502299 0 0 3 0x14200 bored softnet5 60815 284577 0 0 3 0x14200 bored softnet4 96755 109811 0 0 3 0x14200 bored softnet3 57083 35970 0 0 3 0x14200 bored softnet2 8648 45125 0 0 3 0x14200 bored softnet1 77653 60838 0 0 3 0x14200 bored softnet0 49905 301585 0 0 3 0x14200 bored systqmp 76576 439816 0 0 3 0x14200 bored systq 71293 62384 0 0 3 0x14200 tmoslp softclockmp 68592 323484 0 0 3 0x40014200 tmoslp softclock 78594 236927 0 0 3 0x40014200 idle0 1 275360 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 30622 (syz-executor) thread 0xffff80002a3eb4f0 (257075) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83917f80) #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 3897 (syz-executor) thread 0xffff80002a2c6020 (292745) exclusive rrwlock inode r = 0 (0xfffffd806b6517d0) #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 57696 (syz-executor) thread 0xffff80003c450558 (111152) exclusive rrwlock inode r = 0 (0xfffffd806e15da58) #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 58763 (syz-executor) thread 0xffff80002a3ea030 (463241) exclusive rrwlock inode r = 0 (0xfffffd806b651208) #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 67302 (syz-executor) thread 0xffff80003c4502c0 (299246) exclusive rrwlock inode r = 0 (0xfffffd806b6518f8) #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 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:748 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806bef7eb8) #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 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:748 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 11110K 11240K 166960K 11903 0 pcb 18 16K 18K 166960K 259 0 rtable 221 8K 9K 166960K 368 0 pf 35 17K 21K 166960K 119 0 ifaddr 42 7K 8K 166960K 85 0 ifgroup 56 2K 2K 166960K 127 0 sysctl 4 1K 9K 166960K 12 0 counters 68 36K 38K 166960K 152 0 ioctlops 0 0K 4K 166960K 1549 0 iov 0 0K 16K 166960K 49 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1337 84K 85K 166960K 1778 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 723 0 sigio 0 0K 0K 166960K 19 0 proc 72 115K 164K 166960K 624 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 64 0 in_multi 92 6K 7K 166960K 125 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 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 630 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 257 162K 174K 166960K 8495 0 UVM aobj 8 2K 2K 166960K 8 0 pinsyscall 42 84K 104K 166960K 1887 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 21 0 NDP 12 0K 2K 166960K 56 0 temp 58 8647K 8898K 166960K 33852 0 kqueue 14 22K 30K 166960K 172 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 83 0 79 1 0 1 1 0 8 0 rtentry 176 125 0 31 5 0 5 5 0 8 0 unpcb 144 438 0 420 5 4 1 4 0 8 0 syncache 336 10 0 10 3 2 1 1 0 8 1 tcpqe 32 3 0 3 3 2 1 1 0 8 1 tcpcb 736 222 0 214 5 3 2 4 0 8 1 arp 128 16 0 5 1 0 1 1 0 8 0 inpcb 328 1078 0 1063 27 17 10 17 0 8 8 nd6 144 19 0 4 1 0 1 1 0 8 0 pkpcb 40 8 0 8 3 2 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 1 1 1 0 8 1 ppxss 1192 36 0 36 3 2 1 1 0 8 1 pppxif 1504 4 0 4 3 2 1 1 0 8 1 pffrag 232 5 0 1 1 0 1 1 0 482 0 pffrnode 88 5 0 1 1 0 1 1 0 8 0 pffrent 40 7 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 pfanchor 1288 3 0 3 1 1 0 1 0 8 0 pfstitem 24 52 0 14 1 0 1 1 0 8 0 pfstkey 128 52 0 14 2 0 2 2 0 8 0 pfstate 384 52 0 14 5 0 5 5 0 8 0 pfrule 1344 25 0 19 2 0 2 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 256 559 0 150 30 2 28 28 0 8 0 art_table 40 562 0 150 5 0 5 5 0 8 0 art_node 32 125 0 42 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 14 0 5 1 0 1 1 0 8 0 shmpl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2647 0 1140 96 1 95 96 0 8 0 ffsino 296 2647 0 1140 117 0 117 117 0 8 0 nchpl 144 3639 0 1947 63 0 63 63 0 8 0 rtmask 32 7 0 7 2 1 1 1 0 8 1 uvmvnodes 80 2938 0 0 60 0 60 60 0 8 0 vnodes 216 2938 0 0 164 0 164 164 0 8 0 namei 1024 12793 0 12792 2 1 1 1 0 8 0 percpumem 16 91 0 42 1 0 1 1 0 8 0 kstatmem 264 78 0 52 4 1 3 3 0 8 1 scsiplug 72 3 0 3 3 2 1 1 0 8 1 scxspl 216 20395 0 20391 10 9 1 8 1 8 0 plimitpl 152 285 0 264 1 0 1 1 0 8 0 sigapl 424 1062 0 987 9 0 9 9 0 8 0 knotepl 120 557 0 0 17 0 17 17 0 8 0 kqueuepl 224 323 0 313 7 2 5 5 0 8 3 pipepl 344 190 0 163 6 3 3 6 0 8 0 fdescpl 528 1016 0 985 3 0 3 3 0 8 0 filepl 160 6322 0 6094 32 13 19 20 0 8 8 lockfpl 104 414 0 411 2 0 2 2 0 8 1 lockfspl 48 96 0 93 1 0 1 1 0 8 0 sessionpl 144 29 0 20 1 0 1 1 0 8 0 pgrppl 48 44 0 27 1 0 1 1 0 8 0 ucredpl 104 807 0 794 1 0 1 1 0 8 0 zombiepl 144 1110 0 1106 1 0 1 1 0 8 0 processpl 1232 1062 0 987 6 0 6 6 0 8 0 procpl 664 2117 0 2034 8 0 8 8 0 8 0 sosppl 168 3 0 3 2 1 1 1 0 8 1 sockpl 752 1690 0 1653 36 22 14 23 0 8 9 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k 2048 38 0 0 5 0 5 5 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 266 0 0 16 0 16 16 0 8 0 bufpl 280 8551 0 2407 440 0 440 440 0 8 0 anonpl 32 10180 0 0 82 0 82 82 0 246 0 amapchunkpl 152 27895 0 27137 49 15 34 34 0 158 2 amappl16 200 3751 0 3551 30 15 15 19 0 8 4 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 130 0 117 1 0 1 1 0 8 0 amappl13 176 23 0 23 1 1 0 1 0 8 0 amappl12 168 1708 0 1677 3 1 2 2 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 9 0 8 1 0 1 1 0 8 0 amappl9 144 275 0 275 1 1 0 1 0 8 0 amappl8 136 26 0 24 1 0 1 1 0 8 0 amappl7 128 116 0 104 1 0 1 1 0 8 0 amappl6 120 196 0 193 1 0 1 1 0 8 0 amappl5 112 135 0 126 1 0 1 1 0 8 0 amappl4 104 323 0 303 1 0 1 1 0 8 0 amappl3 96 5308 0 5188 5 1 4 4 0 8 0 amappl2 88 711 0 649 2 0 2 2 0 8 0 amappl1 80 12140 0 11544 15 1 14 15 0 8 0 amappl 88 7659 0 7476 6 1 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 2 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 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1016 0 985 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1016 0 985 1 0 1 1 0 8 0 vmmpekpl 168 10551 0 10514 3 0 3 3 0 8 0 vmmpepl 168 71818 0 69644 109 6 103 103 0 357 3 vmsppl 488 1015 0 985 6 1 5 5 0 8 0 rwobjpl 80 24980 0 20913 85 1 84 84 0 8 0 pdppl 4096 2040 0 1970 108 34 74 86 0 8 4 pvpl 32 19076 0 0 154 0 154 154 0 265 0 pmappl 256 1015 0 985 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 297 0 46 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(ffffffff837acff0) 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(ffffffff83917d78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83917d78) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80003c48cd30,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+0x19 kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x19 sys/dev/kcov.c:153 sys_clock_gettime(ffff80002a3eb788,ffff80003c48cfc0,ffff80003c48cf10) at sys_clock_gettime+0x57 sys/kern/kern_time.c:173 syscall(ffff80003c48cfc0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c48cfc0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70e133b9f560, count: -10 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff80002a3eb4f0,ffff80003ac3dc40,ffff80003ac3db90) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003ac3dc40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac3dc40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17b94a37870, count: -3