witness: lock order reversal: 1st 0xffff8000299dee00 &cq->cq_mtx (&cq->cq_mtx) 2nd 0xffffffff839907c0 &sched_lock (&sched_lock) lock order [1] &cq->cq_mtx (&cq->cq_mtx) -> [2] &sched_lock (&sched_lock) #0 mtx_enter+0x4a sys/kern/kern_lock.c:251 #1 sleep_setup+0xc6 sys/kern/kern_synch.c:348 #2 msleep+0x114 sys/kern/kern_synch.c:245 #3 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 #4 dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #4 dtclose+0x105 sys/dev/dt/dt_dev.c:232 #5 spec_close+0x45f sys/kern/spec_vnops.c:-1 #6 VOP_CLOSE+0x133 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+0x126 sys/kern/kern_descrip.c:1267 #9 closef+0x192 sys/kern/kern_descrip.c:1251 #10 fdfree+0x116 sys/kern/kern_descrip.c:1182 #11 exit1+0x5a0 sys/kern/kern_exit.c:215 #12 sys_exit+0x1a sys/kern/kern_exit.c:-1 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #14 Xsyscall+0x128 lock order [2] &sched_lock (&sched_lock) -> [1] &cq->cq_mtx (&cq->cq_mtx) #0 mtx_enter+0x4a sys/kern/kern_lock.c:251 #1 clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 #2 mi_switch+0x165 x86_atomic_clearbits_u32 machine/atomic.h:-1 [inline] #2 mi_switch+0x165 sys/kern/sched_bsd.c:371 #3 preempt+0x6a sys/kern/sched_bsd.c:338 #4 ast+0x165 mi_ast sys/sys/syscall_mi.h:252 [inline] #4 ast+0x165 sys/arch/amd64/amd64/trap.c:543 #5 Xsyscall+0x156 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(ffffffff839907c0,9,0) at witness_checkorder+0x10fb sys/kern/subr_witness.c:-1 mtx_enter(ffffffff839907b0) at mtx_enter+0x4a sys/kern/kern_lock.c:251 sleep_setup(ffff8000299dee50,220,ffffffff833aaa67) at sleep_setup+0xc6 sys/kern/kern_synch.c:348 msleep(ffff8000299dee50,ffff8000299dedf0,220,ffffffff833aaa67,0) at msleep+0x114 sys/kern/kern_synch.c:245 dt_ioctl_record_stop(ffff800001488000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 dtclose(21e5f,81,2000,ffff80003ac1a2b8) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff80003ac1a2b8) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c46f3f0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e255570,81,fffffd80097fb680,ffff80003ac1a2b8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bcdaea8,ffff80003ac1a2b8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bcdaea8,ffff80003ac1a2b8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bcdaea8,ffff80003ac1a2b8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806bcdaea8,ffff80003ac1a2b8) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003ac1a2b8) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003ac1a2b8,0,0,1) at exit1+0x5a0 sys/kern/kern_exit.c:215 sys_exit(ffff80003ac1a2b8,ffff80003c46f760,ffff80003c46f6b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c46f760) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c46f760) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ee95a3c2120, count: -17 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c46f0f0 rbx 0xfffffd8004706330 rdx 0 rcx 0xffff80003ac1a2b8 rax 0xffffffff837ebff0 cpu_info_full_primary+0x1ff0 r8 0xffff80003c46efd0 r9 0x8080808080808080 r10 0x399e0b790e73adcd r11 0x77771f0952da3232 r12 0 r13 0xfffffd8003f59300 r14 0x3 r15 0xffffffff rip 0xffffffff82898075 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c46f0e0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=358230 pid=70123 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003ac1a2b8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003ac1acf8,0xffff80003ac18a88 process=0xffff80003ac1ebb8 user=0xffff80003c46a000, vmspace=0xfffffd805eebdd48 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 1486 165843 51209 0 2 0 syz-executor 1486 214235 51209 0 3 0x4000080 kqread syz-executor 1486 271574 51209 0 3 0x4000080 fsleep syz-executor 54133 264019 7519 0 3 0x80 nanoslp syz-executor 54133 270609 7519 0 3 0x4000080 fsleep syz-executor 59524 426295 97512 0 2 0 syz-executor 54575 317061 9748 0 2 0 syz-executor 54575 257721 9748 0 2 0x4000000 syz-executor 13612 330226 42887 0 2 0 syz-executor 13612 69637 42887 0 3 0x4000080 nanoslp syz-executor 13612 147660 42887 0 3 0x4000080 fsleep syz-executor 52582 339181 33136 -1 2 0x10 syz-executor 52582 456652 33136 -1 3 0x4000090 fsleep syz-executor 52582 41370 33136 -1 3 0x4000090 fsleep syz-executor 73584 519785 57388 0 3 0x3000 suspend syz-executor 73584 92876 57388 0 3 0x4081000 biowait syz-executor 42887 146149 53706 0 3 0x82 nanoslp syz-executor 13879 149130 0 0 3 0x14200 acct acct 57388 178819 53706 0 3 0x82 nanoslp syz-executor 97649 503620 1 0 3 0x100083 ttyin getty 97512 196743 53706 0 3 0x82 nanoslp syz-executor 75358 192634 53706 0 3 0x82 nanoslp syz-executor 33136 30362 53706 0 3 0x82 nanoslp syz-executor 9748 24188 53706 0 3 0x82 nanoslp syz-executor 7519 405076 53706 0 3 0x82 nanoslp syz-executor 39599 76980 97488 0 3 0x82 sbwait sshd-session 18602 61627 0 0 3 0x14200 bored sosplice 51209 138000 53706 0 3 0x82 nanoslp syz-executor 53706 188485 31992 0 3 0x82 kqread syz-executor 31992 488559 17067 0 3 0x10008a sigsusp ksh 17067 276878 4202 0 3 0x98 kqread sshd-session 4202 179272 97488 0 3 0x92 kqread sshd-session 97488 348339 1 0 3 0x88 kqread sshd 1498 332293 17002 74 3 0x1100092 bpf pflogd 17002 101117 1 0 3 0x80 sbwait pflogd 5931 403124 41425 73 3 0x1100090 kqread syslogd 41425 206888 1 0 3 0x100082 sbwait syslogd 17902 142019 1 0 3 0x100080 kqread resolvd 87921 136073 3960 77 3 0x100092 kqread dhcpleased 80389 52650 3960 77 3 0x100092 kqread dhcpleased 3960 381699 1 0 3 0x80 kqread dhcpleased 40864 317086 0 0 3 0x14200 bored smr 85112 312092 0 0 2 0x14200 zerothread 88560 368534 0 0 3 0x14200 aiodoned aiodoned 98144 31448 0 0 3 0x14200 syncer update 36755 211702 0 0 3 0x14200 cleaner cleaner 29068 295412 0 0 3 0x14200 reaper reaper 95047 446975 0 0 3 0x14200 pgdaemon pagedaemon 82455 243629 0 0 3 0x14200 bored viomb 82497 436779 0 0 3 0x40014200 acpi0 acpi0 86128 127782 0 0 7 0x40014200 idle1 41891 169132 0 0 3 0x14200 bored softnet3 48529 413737 0 0 3 0x14200 bored softnet2 12943 506862 0 0 3 0x14200 bored softnet1 89096 78704 0 0 3 0x14200 bored softnet0 90307 403051 0 0 3 0x14200 bored systqmp 57529 150848 0 0 3 0x14200 bored systq 46406 465918 0 0 3 0x14200 tmoslp softclockmp 9608 429590 0 0 3 0x40014200 tmoslp softclock 12716 32703 0 0 3 0x40014200 idle0 1 314630 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 (0xffff8000299dee00) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:295 #2 mtx_enter+0x62 sys/kern/kern_lock.c:252 #3 clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 #4 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 #5 dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #5 dtclose+0x105 sys/dev/dt/dt_dev.c:232 #6 spec_close+0x45f sys/kern/spec_vnops.c:-1 #7 VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 #8 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #8 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #9 fdrop+0x126 sys/kern/kern_descrip.c:1267 #10 closef+0x192 sys/kern/kern_descrip.c:1251 #11 fdfree+0x116 sys/kern/kern_descrip.c:1182 #12 exit1+0x5a0 sys/kern/kern_exit.c:215 #13 sys_exit+0x1a sys/kern/kern_exit.c:-1 #14 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #14 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #15 Xsyscall+0x128 Process 73584 (syz-executor) thread 0xffff80002a2ba7c8 (92876) exclusive rrwlock inode r = 0 (0xfffffd8073a8ab00) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x367 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:606 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x190 sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10221 11126K 11485K 166960K 17292 0 pcb 17 18K 24K 166960K 683 0 rtable 195 10K 10K 166960K 846 0 pf 45 20K 83K 166960K 243 0 ifaddr 35 6K 8K 166960K 155 0 ifgroup 61 2K 3K 166960K 254 0 sysctl 4 1K 9K 166960K 33 0 counters 68 36K 38K 166960K 246 0 ioctlops 0 0K 4K 166960K 2100 0 iov 0 0K 20K 166960K 341 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1494 94K 95K 166960K 5098 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 13K 166960K 43 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 164 0 dirhash 15 2K 3K 166960K 54 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 3154 0 sigio 0 0K 0K 166960K 123 0 proc 73 91K 139K 166960K 1043 0 subproc 72 4K 4K 166960K 136 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 756 0 in_multi 65 4K 7K 166960K 283 0 ether_multi 1 0K 0K 166960K 21 0 mrt 1 0K 0K 166960K 17 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 1089 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 258 161K 175K 166960K 29479 0 UVM aobj 98 3K 5K 166960K 105 0 pinsyscall 45 90K 107K 166960K 4436 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 382 0 NDP 14 0K 2K 166960K 107 0 temp 82 8688K 8816K 166960K 153163 0 kqueue 14 20K 30K 166960K 531 0 SYN cache 2 10K 18K 166960K 3 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 120 367 0 364 5 4 1 3 0 8 0 rtentry 176 256 0 177 6 0 6 6 0 8 0 unpcb 144 2349 0 2330 17 15 2 6 0 8 1 syncache 336 14 0 14 5 5 0 1 0 8 0 tcpqe 32 5 0 5 3 3 0 1 0 8 0 tcpcb 808 1287 0 1277 29 27 2 8 0 8 0 arp 128 48 0 29 1 0 1 1 0 8 0 inpcb 384 3718 0 3702 41 36 5 19 0 8 2 nd6 144 54 0 37 2 0 2 2 0 8 0 pkpcb 40 19 0 19 6 5 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 65 0 65 4 3 1 1 0 8 1 pppxif 1504 8 0 8 4 4 0 1 0 8 0 pffrag 232 20 0 10 1 0 1 1 0 482 0 pffrnode 88 17 0 9 1 0 1 1 0 8 0 pffrent 40 37 0 27 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 0 1 0 1 1 0 8 0 pfanchor 1288 7 0 2 1 0 1 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 168 0 90 1 0 1 1 0 8 0 pfstkey 128 168 0 90 3 0 3 3 0 8 0 pfstate 384 168 0 90 8 0 8 8 0 8 0 pfrule 1344 52 0 22 4 1 3 3 0 8 0 rttmr 136 3 0 3 2 2 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1046 0 722 32 8 24 30 0 8 1 art_table 32 1050 0 722 4 0 4 4 0 8 0 art_node 16 247 0 183 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 12 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 158 0 148 1 0 1 1 0 8 0 shmpl 112 102 0 7 3 0 3 3 0 8 0 dirhash 1024 45 0 26 3 0 3 3 0 8 0 dino2pl 256 6928 0 5411 96 0 96 96 0 8 0 ffsino 288 6928 0 5411 109 0 109 109 0 8 0 nchpl 144 11203 0 9493 64 0 64 64 0 8 0 rtmask 32 10 0 10 6 6 0 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 43515 0 43515 2 1 1 1 0 8 1 percpumem 16 138 0 89 1 0 1 1 0 8 0 kstatmem 264 158 0 130 4 1 3 3 0 8 1 scsiplug 72 14 0 14 6 5 1 1 0 8 1 scxspl 216 35660 0 35659 12 11 1 8 1 8 0 plimitpl 152 907 0 889 1 0 1 1 0 8 0 sigapl 424 3441 0 3388 9 2 7 9 0 8 0 knotepl 120 647 0 0 18 0 18 18 0 8 0 kqueuepl 224 1362 0 1351 16 14 2 5 0 8 1 pipepl 336 464 0 437 11 8 3 8 0 8 0 fdescpl 520 3393 0 3360 3 0 3 3 0 8 0 filepl 160 25855 0 25626 42 29 13 23 0 8 1 lockfpl 104 875 0 870 1 0 1 1 0 8 0 lockfspl 48 370 0 365 1 0 1 1 0 8 0 sessionpl 144 42 0 32 1 0 1 1 0 8 0 pgrppl 48 112 0 94 1 0 1 1 0 8 0 ucredpl 104 4104 0 4089 1 0 1 1 0 8 0 zombiepl 144 3544 0 3543 2 1 1 1 0 8 0 processpl 1240 3441 0 3388 6 0 6 6 0 8 0 procpl 656 7878 0 7816 8 2 6 8 0 8 0 srpgc 96 16 0 16 5 4 1 1 0 8 1 sosppl 168 23 0 23 6 5 1 1 0 8 1 sockpl 728 6665 0 6629 65 58 7 21 0 8 2 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 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 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 33 0 0 4 0 4 4 0 8 0 mtagpl 96 200 0 0 5 0 5 5 0 8 0 mbufpl 256 1169 0 0 74 0 74 74 0 8 0 bufpl 280 12199 0 6057 439 0 439 439 0 8 0 anonpl 32 22824 0 0 185 1 184 184 0 246 0 amapchunkpl 152 101853 0 101236 66 34 32 36 0 158 3 amappl16 200 9695 0 8787 68 10 58 58 0 8 5 amappl15 192 9 0 9 3 3 0 1 0 8 0 amappl14 184 144 0 130 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 4156 0 4123 4 2 2 3 0 8 0 amappl11 160 71 0 57 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 243 0 243 1 1 0 1 0 8 0 amappl8 136 48 0 45 1 0 1 1 0 8 0 amappl7 128 131 0 117 1 0 1 1 0 8 0 amappl6 120 264 0 259 1 0 1 1 0 8 0 amappl5 112 158 0 147 1 0 1 1 0 8 0 amappl4 104 383 0 362 1 0 1 1 0 8 0 amappl3 96 20759 0 20644 5 1 4 4 0 8 0 amappl2 88 835 0 765 2 0 2 2 0 8 0 amappl1 80 23170 0 22475 20 3 17 17 0 8 0 amappl 88 28050 0 27872 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 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 7 0 7 2 2 0 1 0 8 0 dma128 128 257 0 257 5 5 0 1 0 8 0 dma64 64 9 0 9 4 4 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 52 0 51 1 0 1 1 0 8 0 aobjpl 72 104 0 7 2 0 2 2 0 8 0 uaddrrnd 24 3393 0 3360 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3393 0 3360 1 0 1 1 0 8 0 vmmpekpl 168 25091 0 25026 4 0 4 4 0 8 0 vmmpepl 168 217629 0 214552 173 25 148 160 0 357 4 vmsppl 480 3392 0 3360 7 2 5 5 0 8 0 rwobjpl 72 58535 0 50590 149 0 149 149 0 8 0 pdppl 4096 6794 0 6720 138 62 76 88 0 8 2 pvpl 32 31820 0 0 258 1 257 257 0 265 0 pmappl 256 3392 0 3360 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 536 0 118 13 0 13 13 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(ffffffff839907c0,9,0) at witness_checkorder+0x10fb sys/kern/subr_witness.c:-1 mtx_enter(ffffffff839907b0) at mtx_enter+0x4a sys/kern/kern_lock.c:251 sleep_setup(ffff8000299dee50,220,ffffffff833aaa67) at sleep_setup+0xc6 sys/kern/kern_synch.c:348 msleep(ffff8000299dee50,ffff8000299dedf0,220,ffffffff833aaa67,0) at msleep+0x114 sys/kern/kern_synch.c:245 dt_ioctl_record_stop(ffff800001488000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 dtclose(21e5f,81,2000,ffff80003ac1a2b8) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff80003ac1a2b8) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c46f3f0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e255570,81,fffffd80097fb680,ffff80003ac1a2b8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bcdaea8,ffff80003ac1a2b8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bcdaea8,ffff80003ac1a2b8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bcdaea8,ffff80003ac1a2b8) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806bcdaea8,ffff80003ac1a2b8) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003ac1a2b8) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003ac1a2b8,0,0,1) at exit1+0x5a0 sys/kern/kern_exit.c:215 sys_exit(ffff80003ac1a2b8,ffff80003c46f760,ffff80003c46f6b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c46f760) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c46f760) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ee95a3c2120, count: -17 ddb{0}> machine ddbcpu 1