witness: lock order reversal: 1st 0xffff8000299eee08 &cq->cq_mtx (&cq->cq_mtx) 2nd 0xffffffff83902808 &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:260 #1 sleep_setup+0xc6 sys/kern/kern_synch.c:302 #2 msleep_nsec+0x10b sys/kern/kern_synch.c:217 #3 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:582 #4 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #4 dtclose+0x109 sys/dev/dt/dt_dev.c:232 #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:748 #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:260 #1 clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 #2 mi_switch+0x16f sys/kern/sched_bsd.c:378 #3 ast+0x15a mi_ast sys/sys/syscall_mi.h:252 [inline] #3 ast+0x15a sys/arch/amd64/amd64/trap.c:712 #4 intr_user_exit+0x3c 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(ffffffff83902808,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 mtx_enter(ffffffff839027f8) at mtx_enter+0x4a sys/kern/kern_lock.c:260 sleep_setup(ffff8000299eee58,220,ffffffff833f1aeb) at sleep_setup+0xc6 sys/kern/kern_synch.c:302 msleep_nsec(ffff8000299eee58,ffff8000299eedf8,220,ffffffff833f1aeb,ffffffffffffffff) at msleep_nsec+0x10b sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff800001475000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:582 dtclose(21e5f,81,2000,ffff80003c45a2d8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff80003c45a2d8) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff8000314018d0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8066b1e6c8,81,fffffd80097fb340,ffff80003c45a2d8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805dbcb910,ffff80003c45a2d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805dbcb910,ffff80003c45a2d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805dbcb910,ffff80003c45a2d8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805dbcb910,ffff80003c45a2d8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c45a2d8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c45a2d8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c45a2d8,ffff800031401c40,ffff800031401b90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800031401c40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800031401c40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x787fcbf30d10, count: -17 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff8000314015e0 rbx 0 rdx 0 rcx 0xffff80003c45a2d8 rax 0xffffffff8385eff0 cpu_info_full_primary+0x1ff0 r8 0xffff8000314014c0 r9 0x8080808080808080 r10 0xc0196b2e2500e1c2 r11 0x7cc58670928af335 r12 0xfffffd8003ef6dc0 r13 0xfffffd80046a1330 r14 0x3 r15 0xffffffff833dc74b substchar+0x66e4 rip 0xffffffff81b70d75 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000314015d0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=307394 pid=24169 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=78, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c45a2d8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c45b500,0xffff800035410578 process=0xffff80003ac26240 user=0xffff8000313fc000, vmspace=0xfffffd80690305d8 estcpu=36, cpticks=4, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 9139 400360 72802 0 2 0 syz-executor 9139 322789 72802 0 2 0x4000000 syz-executor 91153 29669 35428 0 2 0 syz-executor 91153 136442 35428 0 3 0x4000080 kqsel syz-executor 91153 449793 35428 0 3 0x4000080 fsleep syz-executor 6794 292303 13627 0 2 0 syz-executor 6794 46286 13627 0 3 0x4000080 fsleep syz-executor 81263 390693 66523 0 2 0 syz-executor 81263 101412 66523 0 3 0x4000080 fsleep syz-executor 79312 348311 49094 0 2 0 syz-executor 79312 440278 49094 0 3 0x4000080 fsleep syz-executor 35504 42890 59402 0 3 0x80 nanoslp syz-executor 35504 1887 59402 0 3 0x4000080 kqread syz-executor 35504 379034 59402 0 3 0x4000080 fsleep syz-executor 49771 464041 11378 0 3 0x82 nanoslp syz-executor 62833 359146 0 0 3 0x14280 nfsidl nfsio 4383 462278 0 0 3 0x14280 nfsidl nfsio 38947 126172 0 0 3 0x14280 nfsidl nfsio 93550 306309 0 0 3 0x14280 nfsidl nfsio 36956 107826 0 0 3 0x14280 nfsidl nfsio 61983 441755 0 0 3 0x14280 nfsidl nfsio 16864 130716 0 0 3 0x14280 nfsidl nfsio 24772 285965 0 0 3 0x14280 nfsidl nfsio 69497 178854 0 0 3 0x14280 nfsidl nfsio 9411 501931 0 0 3 0x14280 nfsidl nfsio 92647 298018 0 0 3 0x14280 nfsidl nfsio 64250 451849 0 0 3 0x14280 nfsidl nfsio 97103 520526 0 0 3 0x14280 nfsidl nfsio 54311 285939 0 0 3 0x14280 nfsidl nfsio 60991 372825 0 0 3 0x14280 nfsidl nfsio 47900 89184 0 0 3 0x14280 nfsidl nfsio 2364 159048 0 0 3 0x14280 nfsidl nfsio 18827 43465 0 0 3 0x14280 nfsidl nfsio 88663 37817 0 0 3 0x14280 nfsidl nfsio 46760 362440 0 0 3 0x14280 nfsidl nfsio 91088 191131 0 0 3 0x14200 bored sosplice 59402 417363 11378 0 3 0x82 nanoslp syz-executor 35428 346572 11378 0 3 0x82 nanoslp syz-executor 72802 274940 11378 0 3 0x82 nanoslp syz-executor 49094 359187 11378 0 3 0x82 nanoslp syz-executor 58010 193764 11378 0 3 0x82 wait syz-executor 13627 242554 11378 0 3 0x82 nanoslp syz-executor 66523 207867 11378 0 3 0x82 nanoslp syz-executor 11378 497883 96804 0 3 0x82 kqread syz-executor 96804 124931 34028 0 3 0x10008a sigsusp ksh 34028 257261 89907 0 3 0x98 kqread sshd-session 89907 323987 40851 0 3 0x92 kqread sshd-session 93437 274032 1 0 3 0x100083 ttyopn getty 40851 303202 1 0 3 0x88 kqread sshd 52832 522566 86522 74 3 0x1100092 bpf pflogd 86522 430389 1 0 3 0x80 sbwait pflogd 77646 391201 78870 73 3 0x1100090 kqread syslogd 78870 10899 1 0 3 0x100082 sbwait syslogd 69485 391596 1 0 3 0x100080 kqread resolvd 68039 223893 38790 77 3 0x100092 kqread dhcpleased 87374 178353 38790 77 3 0x100092 kqread dhcpleased 38790 57962 1 0 3 0x80 kqread dhcpleased 90054 222239 0 0 3 0x14200 bored smr 70342 405933 0 0 2 0x14200 zerothread 48557 78670 0 0 3 0x14200 aiodoned aiodoned 20655 247312 0 0 3 0x14200 syncer update 43251 59170 0 0 3 0x14200 cleaner cleaner 4630 364110 0 0 3 0x14200 reaper reaper 39265 68559 0 0 3 0x14200 pgdaemon pagedaemon 37583 45049 0 0 3 0x14200 bored viomb 34773 65391 0 0 3 0x40014200 acpi0 acpi0 26391 404654 0 0 7 0x40014200 idle1 50609 238733 0 0 3 0x14200 bored softnet7 74396 260635 0 0 3 0x14200 bored softnet6 70912 272632 0 0 3 0x14200 bored softnet5 96710 264721 0 0 3 0x14200 bored softnet4 86536 320328 0 0 3 0x14200 bored softnet3 17909 261111 0 0 3 0x14200 bored softnet2 43526 263293 0 0 3 0x14200 bored softnet1 89568 128338 0 0 3 0x14200 bored softnet0 92784 81516 0 0 3 0x14200 bored systqmp 72917 463585 0 0 3 0x14200 bored systq 6915 393709 0 0 3 0x14200 tmoslp softclockmp 58003 14644 0 0 3 0x40014200 tmoslp softclock 21255 475168 0 0 3 0x40014200 idle0 1 235343 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 (0xffff8000299eee08) #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_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x13b sys/kern/kern_lock.c:261 #3 clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 #4 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:582 #5 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #5 dtclose+0x109 sys/dev/dt/dt_dev.c:232 #6 spec_close+0x466 sys/kern/spec_vnops.c:-1 #7 VOP_CLOSE+0x132 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+0x121 sys/kern/kern_descrip.c:1280 #10 closef+0x192 sys/kern/kern_descrip.c:1264 #11 fdfree+0x116 sys/kern/kern_descrip.c:1195 #12 exit1+0x576 sys/kern/kern_exit.c:215 #13 sys_exit+0x1a sys/kern/kern_exit.c:-1 #14 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #14 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #15 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10235 11068K 12393K 166960K 13348 0 pcb 18 15K 16K 166960K 334 0 rtable 157 8K 8K 166960K 604 0 pf 30 17K 20K 166960K 155 0 ifaddr 31 5K 8K 166960K 102 0 ifgroup 43 2K 2K 166960K 175 0 sysctl 4 1K 9K 166960K 16 0 counters 62 36K 37K 166960K 312 0 ioctlops 0 0K 4K 166960K 1915 0 iov 0 0K 20K 166960K 128 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1444 91K 91K 166960K 2662 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 18 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 54 0 dirhash 12 2K 3K 166960K 45 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 236K 166960K 1426 0 sigio 0 0K 0K 166960K 31 0 proc 76 131K 164K 166960K 727 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 158 0 in_multi 65 4K 7K 166960K 163 0 ether_multi 1 0K 0K 166960K 19 0 mrt 1 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 655 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 250 154K 167K 166960K 14456 0 UVM aobj 78 5K 5K 166960K 82 0 pinsyscall 43 86K 106K 166960K 2542 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 59 0 NDP 9 0K 1K 166960K 71 0 temp 78 8652K 8906K 166960K 65363 0 kqueue 18 28K 29K 166960K 286 0 SYN cache 2 8K 16K 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 120 168 0 165 2 1 1 2 0 8 0 rtentry 176 166 0 107 5 0 5 5 0 8 0 unpcb 144 939 0 921 10 6 4 6 0 8 3 syncache 336 7 0 7 4 4 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 736 496 0 489 13 6 7 7 0 8 6 arp 128 16 0 7 1 0 1 1 0 8 0 inpcb 328 1684 0 1671 19 12 7 10 0 8 5 nd6 144 22 0 11 1 0 1 1 0 8 0 pkpcb 40 12 0 12 3 2 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 65 0 65 1 1 0 1 0 8 0 ppxss 1192 110 0 110 1 0 1 1 0 8 1 pppxif 1504 5 0 5 3 3 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 9 0 0 1 0 1 1 0 482 0 pffrnode 88 6 0 0 1 0 1 1 0 8 0 pffrent 40 13 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 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfstitem 24 95 0 27 1 0 1 1 0 8 0 pfstkey 128 96 0 28 3 0 3 3 0 8 0 pfstate 384 96 0 28 7 0 7 7 0 8 0 pfrule 1344 22 0 17 2 1 1 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 256 619 0 348 30 10 20 30 0 8 0 art_table 40 622 0 348 5 0 5 5 0 8 0 art_node 32 165 0 117 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 10 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 46 0 36 1 0 1 1 0 8 0 shmpl 112 79 0 4 3 0 3 3 0 8 0 dirhash 1024 41 0 24 3 0 3 3 0 8 0 dino2pl 256 4224 0 2723 95 0 95 95 0 8 0 ffsino 296 4224 0 2723 117 0 117 117 0 8 0 nchpl 144 6359 0 5753 63 39 24 63 0 8 0 rtmask 32 8 0 8 3 2 1 1 0 8 1 uvmvnodes 80 4950 0 0 102 0 102 102 0 8 0 vnodes 216 4950 0 0 275 0 275 275 0 8 0 namei 1024 22135 0 22135 4 3 1 2 0 8 1 percpumem 16 171 0 125 1 0 1 1 0 8 0 kstatmem 264 108 0 88 3 1 2 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 5 0 5 2 2 0 1 0 8 0 scxspl 216 34437 0 34437 10 9 1 8 1 8 1 plimitpl 152 333 0 316 1 0 1 1 0 8 0 sigapl 424 1745 0 1670 9 0 9 9 0 8 0 knotepl 120 619 0 0 19 0 19 19 0 8 0 kqueuepl 224 626 0 610 11 10 1 7 0 8 0 pipepl 344 327 0 300 10 7 3 9 0 8 0 fdescpl 528 1697 0 1665 3 0 3 3 0 8 0 filepl 160 11758 0 11532 21 8 13 17 0 8 2 lockfpl 104 661 0 658 1 0 1 1 0 8 0 lockfspl 48 239 0 236 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 60 0 43 1 0 1 1 0 8 0 ucredpl 104 2192 0 2178 1 0 1 1 0 8 0 zombiepl 144 1672 0 1670 1 0 1 1 0 8 0 processpl 1248 1745 0 1670 6 0 6 6 0 8 0 procpl 664 3749 0 3666 9 1 8 8 0 8 0 sosppl 168 10 0 10 2 2 0 1 0 8 0 sockpl 752 2841 0 2807 28 18 10 17 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 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 109 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 69 0 0 2 0 2 2 0 8 0 mbufpl 256 296 0 0 17 0 17 17 0 8 0 bufpl 280 13988 0 7845 439 0 439 439 0 8 0 anonpl 32 12540 0 0 101 0 101 101 0 246 0 amapchunkpl 152 48548 0 48027 36 9 27 30 0 158 6 amappl16 200 5687 0 5632 52 37 15 28 0 8 8 amappl15 192 9 0 9 2 1 1 1 0 8 1 amappl14 184 122 0 110 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 2358 0 2326 3 1 2 2 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 6 0 6 2 2 0 1 0 8 0 amappl9 144 255 0 255 1 1 0 1 0 8 0 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 118 0 105 1 0 1 1 0 8 0 amappl6 120 193 0 189 1 0 1 1 0 8 0 amappl5 112 128 0 118 1 0 1 1 0 8 0 amappl4 104 315 0 293 1 0 1 1 0 8 0 amappl3 96 9742 0 9620 4 0 4 4 0 8 0 amappl2 88 693 0 628 2 0 2 2 0 8 0 amappl1 80 14012 0 13403 16 1 15 15 0 8 0 amappl 88 13498 0 13322 6 1 5 6 0 92 0 dma16384 16384 1 0 1 1 1 0 1 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 128 255 0 255 3 3 0 1 0 8 0 dma64 64 12 0 12 3 3 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 81 0 4 2 0 2 2 0 8 0 uaddrrnd 24 1697 0 1665 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1697 0 1665 1 0 1 1 0 8 0 vmmpekpl 168 14619 0 14569 3 0 3 3 0 8 0 vmmpepl 168 111126 0 109039 118 18 100 111 0 357 2 vmsppl 488 1696 0 1665 8 4 4 5 0 8 0 rwobjpl 80 34635 0 28630 125 0 125 125 0 8 2 pdppl 4096 3402 0 3330 114 42 72 86 0 8 0 pvpl 32 21071 0 0 170 0 170 170 0 265 0 pmappl 256 1696 0 1665 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 312 0 69 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(ffffffff83902808,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 mtx_enter(ffffffff839027f8) at mtx_enter+0x4a sys/kern/kern_lock.c:260 sleep_setup(ffff8000299eee58,220,ffffffff833f1aeb) at sleep_setup+0xc6 sys/kern/kern_synch.c:302 msleep_nsec(ffff8000299eee58,ffff8000299eedf8,220,ffffffff833f1aeb,ffffffffffffffff) at msleep_nsec+0x10b sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff800001475000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:582 dtclose(21e5f,81,2000,ffff80003c45a2d8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff80003c45a2d8) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff8000314018d0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8066b1e6c8,81,fffffd80097fb340,ffff80003c45a2d8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805dbcb910,ffff80003c45a2d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805dbcb910,ffff80003c45a2d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805dbcb910,ffff80003c45a2d8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805dbcb910,ffff80003c45a2d8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c45a2d8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c45a2d8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c45a2d8,ffff800031401c40,ffff800031401b90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800031401c40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800031401c40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x787fcbf30d10, count: -17 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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_cmp4(ffff8000299eedf8,ffff8000299eedf8) at __sanitizer_cov_trace_cmp4+0x19 kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_cmp4(ffff8000299eedf8,ffff8000299eedf8) at __sanitizer_cov_trace_cmp4+0x19 sys/dev/kcov.c:206 clockintr_dispatch(ffff80002a250320) at clockintr_dispatch+0x3b1 sys/kern/kern_clockintr.c:215 lapic_clockintr(0,0) at lapic_clockintr+0x51 sys/arch/amd64/amd64/lapic.c:484 Xresume_lapic_ltimer() at Xresume_lapic_ltimer+0x2a acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299edff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -9