witness: lock order reversal: 1st 0xffffffff83810e30 &cq->cq_mtx (&cq->cq_mtx) 2nd 0xffffffff839dfb20 &sched_lock (&sched_lock) lock order [1] &cq->cq_mtx (&cq->cq_mtx) -> [2] &sched_lock (&sched_lock) #0 mtx_enter+0x95 sys/kern/kern_lock.c:406 #1 sleep_setup+0xed sys/kern/kern_synch.c:304 #2 msleep_nsec+0x10b sys/kern/kern_synch.c:217 #3 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 #4 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #4 dtclose+0x109 sys/dev/dt/dt_dev.c:239 #5 spec_close+0x466 sys/kern/spec_vnops.c:-1 #6 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #7 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #7 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #8 fdrop+0x121 sys/kern/kern_descrip.c:1280 #9 closef+0x192 sys/kern/kern_descrip.c:1264 #10 fdfree+0x116 sys/kern/kern_descrip.c:1195 #11 exit1+0x576 sys/kern/kern_exit.c:215 #12 sys_exit+0x1a sys/kern/kern_exit.c:-1 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 lock order [2] &sched_lock (&sched_lock) -> [1] &cq->cq_mtx (&cq->cq_mtx) #0 mtx_enter+0x95 sys/kern/kern_lock.c:406 #1 clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 #2 mi_switch+0x187 sys/kern/sched_bsd.c:376 #3 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #4 sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] #4 sys_futex+0xb90 sys/kern/sys_futex.c:155 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffffffff839dfb20,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffffffff839dfb10) at mtx_enter+0x95 sys/kern/kern_lock.c:406 sleep_setup(ffffffff83810e80,220,ffffffff83433841) at sleep_setup+0xed sys/kern/kern_synch.c:304 msleep_nsec(ffffffff83810e80,ffffffff83810e20,220,ffffffff83433841,ffffffffffffffff) at msleep_nsec+0x10b sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff8000015a9000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(11e5f,81,2000,ffff8000373d2558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000373d2558) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c410d50) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8073d74d98,81,fffffd80097fd2d8,ffff8000373d2558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8066b824a8,ffff8000373d2558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8066b824a8,ffff8000373d2558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8066b824a8,ffff8000373d2558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8066b824a8,ffff8000373d2558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000373d2558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000373d2558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000373d2558,ffff80003c4110c0,ffff80003c411010) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4110c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4110c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x770c0e2916a0, count: -17 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c410a20 rbx 0 rdx 0 rcx 0xffff8000373d2558 rax 0xffff8000299ddff0 r8 0xffff80003c410900 r9 0x8080808080808080 r10 0x425696c2199652f0 r11 0xb3567f7ac9cc1c28 r12 0xfffffd8003f48e40 r13 0xfffffd8004736d58 r14 0x3 r15 0xffffffff83421d01 substchar+0x8891 rip 0xffffffff81872d75 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c410a10 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=480824 pid=74935 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000373d2558 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000373d27f0,0xffff8000373d34f8 process=0xffff80002a3bd828 user=0xffff80003c40c000, vmspace=0xfffffd806ad9dd78 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16396 151017 32548 0 7 0 syz-executor 68320 509617 94248 0 2 0 syz-executor 68320 28870 94248 0 3 0x4000080 sbwait syz-executor 26663 424998 82987 0 2 0 syz-executor 26663 382586 82987 0 3 0x4000000 biowait syz-executor 26663 73106 82987 0 3 0x4000080 fsleep syz-executor 52166 144937 1 0 3 0x100083 ttyopn getty 86183 451221 60028 0 3 0x82 nanoslp syz-executor 94248 511475 60028 0 3 0x82 nanoslp syz-executor 79071 435275 60028 0 3 0x82 nanoslp syz-executor 32548 100380 60028 0 2 0x2 syz-executor 98945 188083 60028 0 3 0x82 nanoslp syz-executor 88608 424791 60028 0 2 0x2 syz-executor 78103 473270 60028 0 2 0x2 syz-executor 82987 487282 60028 0 3 0x82 nanoslp syz-executor 60028 264158 21955 0 3 0x82 kqread syz-executor 21955 195371 80715 0 3 0x10008a sigsusp ksh 80715 166698 1296 0 3 0x98 kqread sshd-session 1296 86842 4084 0 3 0x92 kqread sshd-session 4084 204647 1 0 3 0x88 kqread sshd 85594 43263 58449 74 3 0x1100092 bpf pflogd 58449 134607 1 0 3 0x80 sbwait pflogd 38619 445915 50384 73 3 0x1100090 kqread syslogd 50384 92899 1 0 3 0x100082 sbwait syslogd 43738 197443 1 0 3 0x100080 kqread resolvd 61561 29126 91169 77 3 0x100092 kqread dhcpleased 8276 14618 91169 77 3 0x100092 kqread dhcpleased 91169 272353 1 0 3 0x80 kqread dhcpleased 64746 357126 0 0 3 0x14200 bored smr 34831 422347 0 0 2 0x14200 zerothread 26460 299425 0 0 3 0x14200 aiodoned aiodoned 22226 235453 0 0 3 0x14200 syncer update 42333 102155 0 0 3 0x14200 cleaner cleaner 20753 204268 0 0 2 0x14200 reaper 84686 186179 0 0 3 0x14200 pgdaemon pagedaemon 94511 414075 0 0 3 0x14200 bored viomb 1640 93428 0 0 3 0x40014200 acpi0 acpi0 86551 484276 0 0 3 0x40014200 idle1 46338 14581 0 0 3 0x14200 bored softnet1 23386 278093 0 0 3 0x14200 bored softnet0 12480 186105 0 0 3 0x14200 bored systqmp 95855 459711 0 0 3 0x14200 bored systq 66559 248592 0 0 3 0x14200 tmoslp softclockmp 29540 117307 0 0 3 0x40014200 tmoslp softclock 74924 392487 0 0 3 0x40014200 idle0 1 355520 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &cq->cq_mtx r = 0 (0xffffffff83810e30) #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 clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 #3 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 #4 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #4 dtclose+0x109 sys/dev/dt/dt_dev.c:239 #5 spec_close+0x466 sys/kern/spec_vnops.c:-1 #6 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #7 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #7 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #8 fdrop+0x121 sys/kern/kern_descrip.c:1280 #9 closef+0x192 sys/kern/kern_descrip.c:1264 #10 fdfree+0x116 sys/kern/kern_descrip.c:1195 #11 exit1+0x576 sys/kern/kern_exit.c:215 #12 sys_exit+0x1a sys/kern/kern_exit.c:-1 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 Process 68320 (syz-executor) thread 0xffff8000373d27f0 (28870) exclusive rwlock sbufrcv r = 0 (0xffff8000015ca170) #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 sblock+0xb6 sys/kern/uipc_socket2.c:536 #3 soreceive+0x27d sys/kern/uipc_socket.c:878 #4 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #5 sys_recvmmsg+0x410 sys/kern/uipc_syscalls.c:969 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 Process 26663 (syz-executor) thread 0xffff80003c4aed30 (382586) exclusive rrwlock inode r = 0 (0xfffffd80612c4580) #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 11102 12131K 12475K 166960K 13416 0 pcb 17 14K 30K 166960K 370 0 rtable 226 15K 16K 166960K 516 0 pf 38 18K 19K 166960K 169 0 ifaddr 40 7K 8K 166960K 115 0 ifgroup 63 2K 3K 166960K 207 0 sysctl 4 1K 9K 166960K 10 0 counters 72 37K 38K 166960K 240 0 ioctlops 0 0K 4K 166960K 1858 0 iov 1 1K 22K 166960K 166 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1336 84K 85K 166960K 2100 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 19 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 44 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1148 0 sigio 0 0K 0K 166960K 27 0 proc 75 131K 180K 166960K 686 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 134 0 in_multi 86 6K 7K 166960K 165 0 ether_multi 1 0K 0K 166960K 10 0 mrt 1 0K 0K 166960K 14 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 573 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 175K 166960K 12143 0 UVM aobj 99 11K 11K 166960K 107 0 pinsyscall 43 86K 107K 166960K 2296 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 73 0 NDP 13 0K 1K 166960K 82 0 temp 80 8680K 8754K 166960K 54868 0 kqueue 14 22K 32K 166960K 225 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 120 150 0 147 2 1 1 2 0 8 0 rtentry 176 150 0 64 6 0 6 6 0 8 0 unpcb 144 1159 0 1140 13 12 1 6 0 8 0 syncache 336 9 0 9 3 3 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 736 269 0 263 6 5 1 4 0 8 0 arp 136 24 0 8 1 0 1 1 0 8 0 inpcb 328 1189 0 1180 11 9 2 7 0 8 0 nd6 152 29 0 9 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 2 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 4 0 4 2 2 0 1 0 8 0 ppxss 1192 68 0 68 2 1 1 1 0 8 1 pppxif 1504 7 0 7 3 2 1 1 0 8 1 pffrag 232 13 0 6 1 0 1 1 0 482 0 pffrnode 88 12 0 5 1 0 1 1 0 8 0 pffrent 40 21 0 14 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 82 0 31 1 0 1 1 0 8 0 pfstkey 128 82 0 31 2 0 2 2 0 8 0 pfstate 448 82 0 31 6 0 6 6 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 670 0 274 33 7 26 31 0 8 1 art_table 40 672 0 274 5 0 5 5 0 8 0 art_node 32 150 0 74 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 7 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 41 0 31 1 0 1 1 0 8 0 shmpl 112 99 0 7 3 0 3 3 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 3549 0 2039 95 0 95 95 0 8 0 ffsino 296 3549 0 2039 117 0 117 117 0 8 0 nchpl 144 5107 0 3399 64 0 64 64 0 8 0 rtmask 32 17 0 17 3 2 1 1 0 8 1 vnodes 216 3603 0 0 201 0 201 201 0 8 0 namei 1024 17303 0 17303 4 3 1 2 0 8 1 percpumem 16 135 0 84 1 0 1 1 0 8 0 vcpupl 3968 4 0 0 1 0 1 1 0 8 0 vmpool 848 5 0 1 1 0 1 1 0 8 0 kstatmem 264 130 0 100 3 0 3 3 0 8 0 scsiplug 72 8 0 8 3 2 1 1 0 8 1 scxspl 216 28717 0 28716 10 9 1 8 1 8 0 plimitpl 152 261 0 241 1 0 1 1 0 8 0 sigapl 424 1454 0 1406 8 2 6 8 0 8 0 knotepl 120 806 0 0 24 0 24 24 0 8 0 kqueuepl 224 421 0 410 7 2 5 5 0 8 4 pipepl 344 281 0 254 9 6 3 9 0 8 0 fdescpl 528 1417 0 1385 3 0 3 3 0 8 0 filepl 160 9106 0 8875 25 12 13 17 0 8 2 lockfpl 104 409 0 405 1 0 1 1 0 8 0 lockfspl 48 170 0 166 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 49 0 32 1 0 1 1 0 8 0 ucredpl 104 1249 0 1236 1 0 1 1 0 8 0 zombiepl 144 1623 0 1618 2 1 1 1 0 8 0 processpl 1232 1454 0 1406 6 2 4 6 0 8 0 procpl 664 3204 0 3152 8 2 6 8 0 8 0 sosppl 176 6 0 6 3 3 0 1 0 8 0 sockpl 752 2591 0 2560 40 36 4 18 0 8 0 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 1 14 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 42 0 0 6 0 6 6 0 8 0 mtagpl 96 10 0 0 1 0 1 1 0 8 0 mbufpl 256 252 0 0 16 0 16 16 0 8 0 bufpl 280 11358 0 5222 439 0 439 439 0 8 0 anonpl 32 14360 0 0 116 0 116 116 0 246 0 amapchunkpl 152 40940 0 40433 43 20 23 31 0 158 2 amappl16 200 5053 0 5004 68 50 18 36 0 8 11 amappl15 192 7 0 6 2 1 1 1 0 8 0 amappl14 184 18 0 18 2 2 0 1 0 8 0 amappl13 176 436 0 435 1 0 1 1 0 8 0 amappl12 168 1794 0 1752 3 0 3 3 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 54 0 40 1 0 1 1 0 8 0 amappl9 144 263 0 263 1 1 0 1 0 8 0 amappl8 136 29 0 27 1 0 1 1 0 8 0 amappl7 128 102 0 101 1 0 1 1 0 8 0 amappl6 120 296 0 283 1 0 1 1 0 8 0 amappl5 112 81 0 71 1 0 1 1 0 8 0 amappl4 104 471 0 440 1 0 1 1 0 8 0 amappl3 96 7120 0 7022 4 1 3 3 0 8 0 amappl2 88 1556 0 1479 2 0 2 2 0 8 0 amappl1 80 14439 0 13843 16 2 14 15 0 8 0 amappl 88 11194 0 11024 5 0 5 5 0 92 0 uvmvnodes 80 143 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 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 128 257 0 257 3 2 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 72 106 0 8 2 0 2 2 0 8 0 uaddrrnd 24 1417 0 1385 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1417 0 1385 1 0 1 1 0 8 0 vmmpekpl 168 13740 0 13701 3 0 3 3 0 8 0 vmmpepl 168 97168 0 95159 122 18 104 116 0 357 3 vmsppl 488 1416 0 1385 5 0 5 5 0 8 0 rwobjpl 80 28459 0 27259 38 7 31 36 0 8 1 pdppl 4096 2851 0 2776 115 40 75 85 0 8 0 pvpl 32 21819 0 0 176 0 176 176 0 265 0 pmappl 256 1421 0 1386 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 317 0 64 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(ffffffff8380fff0) 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+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 clockintr_dispatch(ffff80002a2c8500) at clockintr_dispatch+0x401 sys/kern/kern_clockintr.c:215 lapic_clockintr(0,0) at lapic_clockintr+0x51 sys/arch/amd64/amd64/lapic.c:482 Xresume_lapic_ltimer() at Xresume_lapic_ltimer+0x2a __mp_lock(ffffffff83902f00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83902f00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffffffff839dfb20,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffffffff839dfb10) at mtx_enter+0x95 sys/kern/kern_lock.c:406 sleep_setup(ffffffff83810e80,220,ffffffff83433841) at sleep_setup+0xed sys/kern/kern_synch.c:304 msleep_nsec(ffffffff83810e80,ffffffff83810e20,220,ffffffff83433841,ffffffffffffffff) at msleep_nsec+0x10b sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff8000015a9000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(11e5f,81,2000,ffff8000373d2558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000373d2558) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c410d50) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8073d74d98,81,fffffd80097fd2d8,ffff8000373d2558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8066b824a8,ffff8000373d2558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8066b824a8,ffff8000373d2558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8066b824a8,ffff8000373d2558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8066b824a8,ffff8000373d2558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000373d2558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000373d2558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000373d2558,ffff80003c4110c0,ffff80003c411010) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4110c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4110c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x770c0e2916a0, count: -17