witness: lock order reversal: 1st 0xffff8000299dee30 &cq->cq_mtx (&cq->cq_mtx) 2nd 0xffffffff83958758 &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 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #11 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffffffff83958758,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffffffff83958748) at mtx_enter+0x95 sys/kern/kern_lock.c:406 sleep_setup(ffff8000299dee80,220,ffffffff83435f95) at sleep_setup+0xed sys/kern/kern_synch.c:304 msleep_nsec(ffff8000299dee80,ffff8000299dee20,220,ffffffff83435f95,ffffffffffffffff) at msleep_nsec+0x10b sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff800001595000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,81,2000,ffff8000fffefca0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff8000fffefca0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c40aa30) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806a1ae490,81,fffffd80097fd4e0,ffff8000fffefca0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bf01408,ffff8000fffefca0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bf01408,ffff8000fffefca0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bf01408,ffff8000fffefca0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806bf01408,ffff8000fffefca0) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff80003c40ac90) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c40ac90) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2969f04bef0, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c40a700 rbx 0 rdx 0xffff800001567880 rcx 0xffff8000fffefca0 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c40a5e0 r9 0x8080808080808080 r10 0x825c308962bf8197 r11 0xf3ecb60055692528 r12 0xfffffd8003f4ae40 r13 0xfffffd80046f5330 r14 0x3 r15 0xffffffff83421f66 substchar+0xa681 rip 0xffffffff819532b5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c40a6f0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=103203 pid=96585 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffee548,0xffffffff838e2d18 process=0xffff800039bdd830 user=0xffff80003c405000, vmspace=0xfffffd806c91eb88 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 96585 492728 43000 0 3 0x80 fsleep syz-executor *96585 103203 43000 0 7 0x4000000 syz-executor 43274 203524 9770 0 3 0x80 fsleep syz-executor 43274 356291 9770 0 3 0x4000080 kqread syz-executor 96733 178264 24388 0 3 0x80 fsleep syz-executor 96733 405957 24388 0 3 0x4000080 kqread syz-executor 91066 521776 4777 0 3 0x80 fsleep syz-executor 91066 404498 4777 0 3 0x4000080 ttyout syz-executor 99968 444130 62203 0 3 0x80 fsleep syz-executor 99968 381493 62203 0 3 0x4000080 ttyin syz-executor 3570 484552 13673 0 3 0x80 fsleep syz-executor 3570 394053 13673 0 3 0x4000080 sbwait syz-executor 3570 164558 13673 0 3 0x4000080 fsleep syz-executor 38357 402979 96559 0 3 0x80 fsleep syz-executor 38357 178261 96559 0 3 0x4000080 lockf syz-executor 18252 192113 34365 0 3 0x100082 sbwait arp 34365 235519 42636 0 3 0x10008a sigsusp sh 42636 291909 11003 0 3 0x82 wait syz-executor 24388 308335 11003 0 3 0x82 nanoslp syz-executor 4777 379121 11003 0 3 0x82 nanoslp syz-executor 43000 7807 11003 0 3 0x82 nanoslp syz-executor 13673 498881 11003 0 3 0x82 nanoslp syz-executor 62203 208077 11003 0 3 0x82 nanoslp syz-executor 96559 404759 11003 0 3 0x82 nanoslp syz-executor 9770 418030 11003 0 3 0x82 nanoslp syz-executor 11003 77222 8701 0 3 0x82 kqread syz-executor 8701 281448 93782 0 3 0x10008a sigsusp ksh 93782 509706 76982 0 3 0x98 kqread sshd-session 76982 314236 64192 0 3 0x92 kqread sshd-session 25496 324450 1 0 3 0x100083 ttyopn getty 64192 129776 1 0 3 0x88 kqread sshd 55553 90469 50753 74 3 0x1100092 bpf pflogd 50753 203127 1 0 3 0x80 sbwait pflogd 21751 239024 15715 73 3 0x1100090 kqread syslogd 15715 121831 1 0 3 0x100082 sbwait syslogd 24389 151675 1 0 3 0x100080 kqread resolvd 52812 424773 9576 77 3 0x100092 kqread dhcpleased 43208 34826 9576 77 3 0x100092 kqread dhcpleased 9576 253410 1 0 3 0x80 kqread dhcpleased 19037 515317 0 0 3 0x14200 bored smr 61973 127451 0 0 3 0x14200 pgzero zerothread 72961 389859 0 0 3 0x14200 aiodoned aiodoned 48250 489576 0 0 3 0x14200 syncer update 28122 61290 0 0 3 0x14200 cleaner cleaner 625 508472 0 0 3 0x14200 reaper reaper 55654 378762 0 0 3 0x14200 pgdaemon pagedaemon 85415 415598 0 0 3 0x14200 bored viomb 23450 216847 0 0 3 0x40014200 acpi0 acpi0 9765 122269 0 0 7 0x40014200 idle1 78729 22388 0 0 3 0x14200 bored softnet1 68900 90834 0 0 3 0x14200 bored softnet0 83330 1916 0 0 3 0x14200 bored systqmp 54656 261735 0 0 3 0x14200 bored systq 10068 175578 0 0 3 0x14200 tmoslp softclockmp 16815 302592 0 0 3 0x40014200 tmoslp softclock 26743 271728 0 0 3 0x40014200 idle0 1 103488 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &cq->cq_mtx r = 0 (0xffff8000299dee30) #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 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 Process 96585 (syz-executor) thread 0xffff8000fffefca0 (103203) exclusive rwlock dtlk r = 0 (0xffffffff83873ae8) #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 dt_ioctl_record_stop+0x2e sys/dev/dt/dt_dev.c:572 #3 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #3 dtclose+0x109 sys/dev/dt/dt_dev.c:239 #4 spec_close+0x466 sys/kern/spec_vnops.c:-1 #5 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #6 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #6 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #7 fdrop+0x121 sys/kern/kern_descrip.c:1280 #8 closef+0x192 sys/kern/kern_descrip.c:1264 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838bc7c8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x121 sys/kern/kern_descrip.c:1280 #3 closef+0x192 sys/kern/kern_descrip.c:1264 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #5 Xsyscall+0x128 exclusive mutex &cq->cq_mtx r = 0 (0xffff8000299dee30) #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 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11077 12131K 12284K 166960K 12536 0 pcb 18 13K 14K 166960K 112 0 rtable 221 8K 8K 166960K 384 0 pf 35 17K 18K 166960K 70 0 ifaddr 43 7K 7K 166960K 62 0 ifgroup 55 2K 2K 166960K 86 0 sysctl 3 1K 9K 166960K 9 0 counters 70 37K 38K 166960K 106 0 ioctlops 0 0K 4K 166960K 1526 0 iov 0 0K 16K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1407 89K 89K 166960K 1616 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 79 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 93K 166960K 397 0 sigio 0 0K 0K 166960K 2 0 proc 72 115K 164K 166960K 554 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 22 0 in_multi 96 6K 7K 166960K 119 0 ether_multi 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 406 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 242 161K 185K 166960K 5556 0 UVM aobj 74 5K 5K 166960K 76 0 pinsyscall 45 90K 110K 166960K 1525 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 8 0 NDP 12 0K 1K 166960K 37 0 temp 76 8676K 8740K 166960K 17147 0 kqueue 14 22K 30K 166960K 81 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 49 0 44 1 0 1 1 0 8 0 rtentry 176 115 0 19 5 0 5 5 0 8 0 unpcb 144 232 0 211 4 0 4 4 0 8 3 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 137 0 131 7 0 7 7 0 8 6 arp 136 17 0 0 1 0 1 1 0 8 0 inpcb 328 531 0 520 9 0 9 9 0 8 7 nd6 152 24 0 1 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 15 0 15 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 0 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 38 0 1 1 0 1 1 0 8 0 pfstkey 128 38 0 1 2 0 2 2 0 8 0 pfstate 448 38 0 1 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 493 0 90 28 0 28 28 0 8 2 art_table 40 496 0 90 5 0 5 5 0 8 0 art_node 32 114 0 27 1 0 1 1 0 8 0 semapl 112 77 0 67 1 0 1 1 0 8 0 shmpl 112 71 0 1 3 0 3 3 0 8 1 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2071 0 566 96 0 96 96 0 8 0 ffsino 296 2071 0 566 117 0 117 117 0 8 0 nchpl 144 2653 0 956 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2316 0 0 129 0 129 129 0 8 0 namei 1024 8380 0 8380 1 0 1 1 0 8 1 percpumem 16 68 0 18 1 0 1 1 0 8 0 vcpupl 3968 1 0 0 1 0 1 1 0 8 0 vmpool 848 2 0 1 1 0 1 1 0 8 0 kstatmem 264 46 0 20 3 0 3 3 0 8 1 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 14816 0 14816 3 2 1 2 1 8 1 plimitpl 152 75 0 58 1 0 1 1 0 8 0 sigapl 424 709 0 660 7 0 7 7 0 8 0 knotepl 120 322 0 0 10 0 10 10 0 8 0 kqueuepl 224 110 0 99 1 0 1 1 0 8 0 pipepl 344 141 0 113 3 0 3 3 0 8 0 fdescpl 528 692 0 659 3 0 3 3 0 8 0 filepl 160 3580 0 3344 17 0 17 17 0 8 6 lockfpl 104 232 0 228 2 0 2 2 0 8 1 lockfspl 48 108 0 105 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 37 0 20 1 0 1 1 0 8 0 ucredpl 104 370 0 357 1 0 1 1 0 8 0 zombiepl 144 660 0 660 1 0 1 1 0 8 1 processpl 1232 709 0 660 5 0 5 5 0 8 0 procpl 664 1190 0 1133 6 0 6 6 0 8 1 sosppl 176 3 0 3 1 1 0 1 0 8 0 sockpl 752 825 0 788 18 5 13 17 0 8 8 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 41 0 0 6 0 6 6 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 215 0 0 14 0 14 14 0 8 0 bufpl 280 6142 0 130 430 0 430 430 0 8 0 anonpl 32 8579 0 0 70 0 70 70 0 246 0 amapchunkpl 152 17534 0 17059 34 4 30 34 0 158 10 amappl16 200 2953 0 2922 16 1 15 15 0 8 8 amappl15 192 16 0 16 1 1 0 1 0 8 0 amappl14 184 3 0 3 1 1 0 1 0 8 0 amappl13 176 421 0 418 1 0 1 1 0 8 0 amappl12 168 1107 0 1062 3 0 3 3 0 8 0 amappl11 160 43 0 43 1 1 0 1 0 8 0 amappl10 152 60 0 46 1 0 1 1 0 8 0 amappl9 144 286 0 286 1 1 0 1 0 8 0 amappl8 136 30 0 28 1 0 1 1 0 8 0 amappl7 128 84 0 82 1 0 1 1 0 8 0 amappl6 120 307 0 292 1 0 1 1 0 8 0 amappl5 112 81 0 71 1 0 1 1 0 8 0 amappl4 104 426 0 396 1 0 1 1 0 8 0 amappl3 96 2819 0 2727 4 1 3 3 0 8 0 amappl2 88 830 0 751 2 0 2 2 0 8 0 amappl1 80 10660 0 10031 16 1 15 16 0 8 0 amappl 88 4775 0 4615 5 0 5 5 0 92 0 uvmvnodes 80 112 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 128 254 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 75 0 2 2 0 2 2 0 8 0 uaddrrnd 24 692 0 659 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 692 0 659 1 0 1 1 0 8 0 vmmpekpl 168 7505 0 7463 3 0 3 3 0 8 0 vmmpepl 168 52861 0 50873 99 0 99 99 0 357 6 vmsppl 488 691 0 659 5 0 5 5 0 8 0 rwobjpl 80 17766 0 16617 29 0 29 29 0 8 1 pdppl 4096 1396 0 1321 100 23 77 86 0 8 2 pvpl 32 17873 0 0 145 0 145 145 0 265 0 pmappl 256 693 0 660 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 289 0 26 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffffffff83958758,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffffffff83958748) at mtx_enter+0x95 sys/kern/kern_lock.c:406 sleep_setup(ffff8000299dee80,220,ffffffff83435f95) at sleep_setup+0xed sys/kern/kern_synch.c:304 msleep_nsec(ffff8000299dee80,ffff8000299dee20,220,ffffffff83435f95,ffffffffffffffff) at msleep_nsec+0x10b sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff800001595000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,81,2000,ffff8000fffefca0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff8000fffefca0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c40aa30) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806a1ae490,81,fffffd80097fd4e0,ffff8000fffefca0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bf01408,ffff8000fffefca0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bf01408,ffff8000fffefca0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bf01408,ffff8000fffefca0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806bf01408,ffff8000fffefca0) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff80003c40ac90) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c40ac90) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2969f04bef0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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 mtx_enter(ffff8000299dee20) at mtx_enter+0x377 sys/kern/kern_lock.c:454 clockintr_dispatch(ffff80002a21c480) 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -9