uvm_fault(0xfffffd806c7497c0, 0x48, 0, 1) -> e kernel: page fault trap, code=0 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d TID PID UID PRFLAGS PFLAGS CPU COMMAND 347582 80776 0 0x14000 0x200 0 reaper witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff800001594030,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff8000015f9000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,1,2000,ffff8000fffefca0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,1,2000,ffff8000fffefca0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff800039fef5e0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e943878,1,fffffd80097fd750,ffff8000fffefca0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069f5e370,ffff8000fffefca0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069f5e370,ffff8000fffefca0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069f5e370,ffff8000fffefca0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8069f5e370,ffff8000fffefca0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffefca0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffefca0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffefca0,ffff800039fef950,ffff800039fef8a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800039fef950) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039fef950) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 end trace frame: 0xffff800039fef9d0, count: 0 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: uvm_fault(0xfffffd806c7497c0, 0x48, 0, 1) -> e ddb{1}> trace witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff800001594030,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff8000015f9000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,1,2000,ffff8000fffefca0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,1,2000,ffff8000fffefca0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff800039fef5e0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e943878,1,fffffd80097fd750,ffff8000fffefca0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069f5e370,ffff8000fffefca0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069f5e370,ffff8000fffefca0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069f5e370,ffff8000fffefca0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8069f5e370,ffff8000fffefca0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffefca0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffefca0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffefca0,ffff800039fef950,ffff800039fef8a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800039fef950) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039fef950) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d6d7e8e15a0, count: -15 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800039fef400 rbx 0 rdx 0 rcx 0xffff8000fffefca0 rax 0xffff8000299ddffe r8 0x90 r9 0x1 r10 0x362ef52d845bf15 r11 0x77e897eb0c4c1160 r12 0xfe r13 0x9 r14 0x28 r15 0 rip 0xffffffff815278b5 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800039fef360 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> show proc PROC (syz-executor) tid=452482 pid=87099 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffefca0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffee548,0xffff8000fffee028 process=0xffff80003c4144f0 user=0xffff800039fea000, vmspace=0xfffffd806c7497c0 estcpu=36, cpticks=7, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 92638 313623 97479 0 2 0 syz-executor 92638 97275 97479 0 2 0x4000000 syz-executor 56002 430068 45320 0 2 0 syz-executor 56002 206317 45320 0 3 0x4000080 fsleep syz-executor 56002 296225 45320 0 3 0x4000080 fsleep syz-executor 3611 135402 7368 0 2 0 syz-executor 3611 511944 7368 0 3 0x4000080 fsleep syz-executor 44185 482502 39796 0 2 0x10 syz-executor 44185 91464 39796 0 3 0x4000090 lockf syz-executor 44185 55935 39796 0 3 0x4000090 fsleep syz-executor 56778 420218 62233 0 3 0x80 nanoslp syz-executor 56778 400502 62233 0 3 0x4000080 kqsel syz-executor 56778 83849 62233 0 3 0x4000080 fsleep syz-executor 97217 246952 14598 0 4 0x82000 syz-executor 97217 523500 14598 0 3 0x4082000 biowait syz-executor 97217 318508 14598 0 3 0x4002000 suspend syz-executor 93226 254691 23451 0 4 0x82000 syz-executor 93226 175128 23451 0 3 0x4082000 biowait syz-executor 93226 365324 23451 0 4 0x4082000 syz-executor 93226 251597 23451 0 3 0x4002000 suspend syz-executor 7346 201507 20259 0 3 0x82 nanoslp syz-executor 14598 13227 20259 0 3 0x82 nanoslp syz-executor 7368 181988 20259 0 3 0x82 nanoslp syz-executor 45320 324170 20259 0 3 0x82 nanoslp syz-executor 23451 460362 20259 0 3 0x82 wait syz-executor 62233 85048 20259 0 3 0x82 nanoslp syz-executor 39796 57687 20259 0 3 0x82 nanoslp syz-executor 97479 96403 20259 0 3 0x82 nanoslp syz-executor 20259 66613 37323 0 3 0x82 kqread syz-executor 37323 444320 8174 0 3 0x10008a sigsusp ksh 8174 431154 68515 0 3 0x98 kqread sshd-session 68515 165870 11113 0 3 0x92 kqread sshd-session 97195 160793 1 0 3 0x100083 ttyopn getty 11113 465369 1 0 3 0x88 kqread sshd 775 166660 76617 74 3 0x1100092 bpf pflogd 76617 189042 1 0 3 0x80 sbwait pflogd 79345 308953 15505 73 3 0x1100090 kqread syslogd 15505 289523 1 0 3 0x100082 sbwait syslogd 38633 224893 1 0 3 0x100080 kqread resolvd 43584 392285 60510 77 3 0x100092 kqread dhcpleased 86922 431196 60510 77 3 0x100092 kqread dhcpleased 60510 240303 1 0 3 0x80 kqread dhcpleased 67732 285073 0 0 3 0x14200 bored smr 45525 450601 0 0 3 0x14200 pgzero zerothread 9491 17065 0 0 3 0x14200 aiodoned aiodoned 20947 169171 0 0 3 0x14200 syncer update 90216 291228 0 0 3 0x14200 cleaner cleaner 80776 347582 0 0 7 0x14200 reaper 48846 493688 0 0 3 0x14200 pgdaemon pagedaemon 51017 125657 0 0 3 0x14200 bored viomb 86094 241091 0 0 3 0x40014200 acpi0 acpi0 37707 82389 0 0 3 0x40014200 idle1 38512 495304 0 0 3 0x14200 bored softnet1 68029 263091 0 0 3 0x14200 bored softnet0 26573 228894 0 0 3 0x14200 bored systqmp 23479 61441 0 0 3 0x14200 bored systq 17989 283800 0 0 3 0x14200 tmoslp softclockmp 98379 346901 0 0 3 0x40014200 tmoslp softclock 11493 275979 0 0 3 0x40014200 idle0 1 221347 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 92638 (syz-executor) thread 0xffff80003c4287f0 (97275) exclusive rrwlock inode r = 0 (0xfffffd805efda210) #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 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:775 #9 Xsyscall+0x128 Process 97217 (syz-executor) thread 0xffff8000363d5ca8 (523500) exclusive rrwlock inode r = 0 (0xfffffd806dbe2c50) #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 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:775 #9 Xsyscall+0x128 Process 93226 (syz-executor) thread 0xffff8000363d5778 (175128) exclusive rrwlock inode r = 0 (0xfffffd806d2677c8) #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 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:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11069 12173K 12239K 166960K 12313 0 pcb 18 12K 12K 166960K 43 0 rtable 220 7K 8K 166960K 361 0 pf 33 17K 18K 166960K 45 0 ifaddr 39 6K 7K 166960K 48 0 ifgroup 51 2K 2K 166960K 61 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 148 0 ioctlops 0 0K 4K 166960K 1515 0 iov 0 0K 12K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1343 85K 85K 166960K 1439 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 252 0 proc 73 115K 164K 166960K 543 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 18 0 in_multi 88 6K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 3 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 395 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 264 161K 168K 166960K 4143 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 43 86K 102K 166960K 1381 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 11 0K 2K 166960K 31 0 temp 45 8671K 8751K 166960K 10180 0 kqueue 14 22K 26K 166960K 43 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 36 1 0 1 1 0 8 0 rtentry 176 111 0 12 5 0 5 5 0 8 0 unpcb 144 103 0 85 1 0 1 1 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 33 0 28 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 144 0 133 2 0 2 2 0 8 0 nd6 152 24 0 3 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 39 0 39 2 1 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 1 0 0 1 0 1 1 0 8 0 pfstkey 128 1 0 0 1 0 1 1 0 8 0 pfstate 448 1 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 44 29 0 29 29 0 8 1 art_table 40 453 0 44 5 0 5 5 0 8 0 art_node 32 111 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 3 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1789 0 274 96 0 96 96 0 8 0 ffsino 296 1789 0 274 118 0 118 118 0 8 0 nchpl 144 2152 0 448 64 0 64 64 0 8 0 rtmask 32 3 0 3 2 1 1 1 0 8 1 vnodes 216 1910 0 0 107 0 107 107 0 8 0 namei 1024 6625 0 6625 3 2 1 2 0 8 1 percpumem 16 89 0 40 1 0 1 1 0 8 0 kstatmem 264 32 0 8 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 9949 0 9947 3 2 1 2 1 8 0 plimitpl 152 116 0 96 1 0 1 1 0 8 0 sigapl 424 561 0 513 7 1 6 7 0 8 0 knotepl 120 315 0 0 10 0 10 10 0 8 0 kqueuepl 224 127 0 48 5 0 5 5 0 8 0 pipepl 344 130 0 101 3 0 3 3 0 8 0 fdescpl 528 545 0 513 3 0 3 3 0 8 0 filepl 160 2405 0 2110 13 0 13 13 0 8 0 lockfpl 104 49 0 44 1 0 1 1 0 8 0 lockfspl 48 22 0 18 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 204 0 190 1 0 1 1 0 8 0 zombiepl 144 514 0 513 2 1 1 1 0 8 0 processpl 1232 561 0 513 5 0 5 5 0 8 0 procpl 664 778 0 717 6 0 6 6 0 8 0 sockpl 752 299 0 266 6 1 5 5 0 8 1 mcl64k 65536 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 23 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 154 0 0 10 0 10 10 0 8 0 bufpl 280 4171 0 133 289 0 289 289 0 8 0 anonpl 32 10877 0 0 88 0 88 88 0 246 0 amapchunkpl 152 12332 0 11757 31 2 29 29 0 158 6 amappl16 200 3003 0 2673 33 8 25 25 0 8 7 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 19 0 19 2 2 0 1 0 8 0 amappl13 176 438 0 437 1 0 1 1 0 8 0 amappl12 168 908 0 865 3 0 3 3 0 8 0 amappl11 160 35 0 35 1 1 0 1 0 8 0 amappl10 152 65 0 51 1 0 1 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 32 0 30 1 0 1 1 0 8 0 amappl7 128 84 0 83 1 0 1 1 0 8 0 amappl6 120 327 0 314 1 0 1 1 0 8 0 amappl5 112 76 0 65 1 0 1 1 0 8 0 amappl4 104 432 0 401 1 0 1 1 0 8 0 amappl3 96 1994 0 1890 4 1 3 3 0 8 0 amappl2 88 655 0 580 2 0 2 2 0 8 0 amappl1 80 9748 0 9156 14 0 14 14 0 8 0 amappl 88 3375 0 3190 5 0 5 5 0 92 0 uvmvnodes 80 106 0 0 3 0 3 3 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 0 1 0 1 1 0 8 0 uaddrrnd 24 545 0 513 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 545 0 513 1 0 1 1 0 8 0 vmmpekpl 168 6389 0 6349 2 0 2 2 0 8 0 vmmpepl 168 43765 0 41486 111 6 105 105 0 357 5 vmsppl 488 544 0 513 5 1 4 5 0 8 0 rwobjpl 80 15916 0 14562 31 0 31 31 0 8 2 pdppl 4096 1097 0 1026 101 30 71 85 0 8 0 pvpl 32 19141 0 0 156 1 155 155 0 265 0 pmappl 256 544 0 513 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 273 0 35 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83889ff0) 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+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff839a1e00) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839a1e00) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80002a2341a0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 reaper(ffff8000ffffc2a0) at reaper+0x135 sys/kern/kern_exit.c:478 end trace frame: 0x0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff83889ff0) 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+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff839a1e00) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839a1e00) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80002a2341a0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 reaper(ffff8000ffffc2a0) at reaper+0x135 sys/kern/kern_exit.c:478 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff800001594030,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff8000015f9000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,1,2000,ffff8000fffefca0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,1,2000,ffff8000fffefca0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff800039fef5e0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e943878,1,fffffd80097fd750,ffff8000fffefca0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069f5e370,ffff8000fffefca0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069f5e370,ffff8000fffefca0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069f5e370,ffff8000fffefca0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8069f5e370,ffff8000fffefca0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffefca0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffefca0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffefca0,ffff800039fef950,ffff800039fef8a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800039fef950) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039fef950) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 end trace frame: 0xffff800039fef9d0, count: 0 ddb{1}> trace witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff800001594030,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff8000015f9000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,1,2000,ffff8000fffefca0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,1,2000,ffff8000fffefca0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff800039fef5e0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e943878,1,fffffd80097fd750,ffff8000fffefca0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069f5e370,ffff8000fffefca0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069f5e370,ffff8000fffefca0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069f5e370,ffff8000fffefca0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8069f5e370,ffff8000fffefca0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffefca0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffefca0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffefca0,ffff800039fef950,ffff800039fef8a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800039fef950) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039fef950) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d6d7e8e15a0, count: -15