witness: lock order reversal: 1st 0xffff8000299dee00 &cq->cq_mtx (&cq->cq_mtx) 2nd 0xffffffff83925120 &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+0x119 sys/kern/kern_synch.c:217 #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+0x59c 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:742 #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+0x172 x86_atomic_clearbits_u32 machine/atomic.h:-1 [inline] #2 mi_switch+0x172 sys/kern/sched_bsd.c:374 #3 ast+0x165 mi_ast sys/sys/syscall_mi.h:252 [inline] #3 ast+0x165 sys/arch/amd64/amd64/trap.c:706 #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(ffffffff83925120,9,0) at witness_checkorder+0x10fb sys/kern/subr_witness.c:-1 mtx_enter(ffffffff83925110) at mtx_enter+0x4a sys/kern/kern_lock.c:260 sleep_setup(ffff8000299dee50,220,ffffffff833aec99) at sleep_setup+0xc6 sys/kern/kern_synch.c:302 msleep_nsec(ffff8000299dee50,ffff8000299dedf0,220,ffffffff833aec99,ffffffffffffffff) at msleep_nsec+0x119 sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff800001481000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 dtclose(21e5f,81,2000,ffff8000ffff2a50) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff8000ffff2a50) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff800038ffb9d0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805dabc000,81,fffffd80097fb000,ffff8000ffff2a50) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bf37248,ffff8000ffff2a50) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bf37248,ffff8000ffff2a50) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bf37248,ffff8000ffff2a50) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806bf37248,ffff8000ffff2a50) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000ffff2a50) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000ffff2a50,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff8000ffff2a50,ffff800038ffbd40,ffff800038ffbc90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800038ffbd40) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038ffbd40) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7812c893f3e0, count: -17 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800038ffb6d0 rbx 0xfffffd8004705330 rdx 0 rcx 0xffff8000ffff2a50 rax 0xffffffff8383dff0 cpu_info_full_primary+0x1ff0 r8 0xffff800038ffb5b0 r9 0x8080808080808080 r10 0xa8874da34cb1ec9f r11 0x363debdf47ac95c4 r12 0 r13 0xfffffd8003f58300 r14 0x3 r15 0xffffffff rip 0xffffffff821458c5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800038ffb6c0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=399277 pid=75948 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000ffff2a50 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000ffff2ce0,0xffff80002a2962c0 process=0xffff80003c41f090 user=0xffff800038ff6000, vmspace=0xfffffd806ef01968 estcpu=32, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 32424 313277 13041 0 3 0x80 fsleep syz-executor 32424 265605 13041 0 3 0x4000080 fsleep syz-executor 32424 437091 13041 0 3 0x4000080 lockf syz-executor 52311 392131 63491 0 3 0x80 fsleep syz-executor 52311 462384 63491 0 3 0x4000080 kqsel syz-executor 9497 165301 23340 0 3 0x80 fsleep syz-executor 9497 304614 23340 0 3 0x4000080 sbwait syz-executor 80171 145412 32647 0 3 0x80 fsleep syz-executor 80171 302728 32647 0 3 0x4000080 sbwait syz-executor 46555 99004 3512 0 3 0x80 fsleep syz-executor 46555 318071 3512 0 3 0x4000080 lockf syz-executor 7996 240211 34130 0 3 0x80 fsleep syz-executor 7996 257653 34130 0 3 0x4000080 kqread syz-executor 8223 220516 71873 0 3 0x80 fsleep syz-executor 8223 388152 71873 0 3 0x4000000 biowait syz-executor 53031 120919 0 0 3 0x14200 acct acct 57093 162789 1 0 3 0x100083 ttyin getty 82802 369065 0 0 3 0x14200 bored sosplice 23340 429288 44319 0 3 0x82 nanoslp syz-executor 32647 409677 44319 0 3 0x82 nanoslp syz-executor 3512 106554 44319 0 3 0x82 nanoslp syz-executor 34130 32612 44319 0 3 0x82 nanoslp syz-executor 71873 177085 44319 0 3 0x82 nanoslp syz-executor 13041 167180 44319 0 3 0x82 nanoslp syz-executor 1833 340442 44319 0 3 0x82 nanoslp syz-executor 63491 93986 44319 0 3 0x82 nanoslp syz-executor 44319 409609 39011 0 3 0x82 kqread syz-executor 39011 96098 83608 0 3 0x10008a sigsusp ksh 83608 153302 77602 0 3 0x98 kqread sshd-session 77602 451244 49497 0 3 0x92 kqread sshd-session 49497 6991 1 0 3 0x88 kqread sshd 48714 483159 42806 74 3 0x1100092 bpf pflogd 42806 262387 1 0 3 0x80 sbwait pflogd 47673 317196 64624 73 3 0x1100090 kqread syslogd 64624 326215 1 0 3 0x100082 sbwait syslogd 56510 3191 1 0 3 0x100080 kqread resolvd 11330 319860 94520 77 3 0x100092 kqread dhcpleased 71482 435371 94520 77 3 0x100092 kqread dhcpleased 94520 520984 1 0 3 0x80 kqread dhcpleased 13795 156648 0 0 3 0x14200 bored smr 6877 517385 0 0 3 0x14200 pgzero zerothread 69484 449926 0 0 3 0x14200 aiodoned aiodoned 54307 428902 0 0 3 0x14200 syncer update 28335 108762 0 0 3 0x14200 cleaner cleaner 17832 511112 0 0 3 0x14200 reaper reaper 10770 154679 0 0 3 0x14200 pgdaemon pagedaemon 80114 255403 0 0 3 0x14200 bored viomb 42767 359246 0 0 3 0x40014200 acpi0 acpi0 77489 486412 0 0 7 0x40014200 idle1 31737 412650 0 0 3 0x14200 bored softnet3 73798 180728 0 0 3 0x14200 bored softnet2 31974 460909 0 0 3 0x14200 bored softnet1 35205 55910 0 0 3 0x14200 bored softnet0 38064 74432 0 0 3 0x14200 bored systqmp 48616 516093 0 0 3 0x14200 bored systq 74975 416488 0 0 3 0x14200 tmoslp softclockmp 12215 218525 0 0 3 0x40014200 tmoslp softclock 99148 113378 0 0 3 0x40014200 idle0 1 231253 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 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: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: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+0x59c 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:742 #15 Xsyscall+0x128 Process 8223 (syz-executor) thread 0xffff800039000cf8 (388152) exclusive rrwlock inode r = 0 (0xfffffd806c6b0440) #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+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #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:742 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10222 11112K 11432K 166960K 12395 0 pcb 19 15K 16K 166960K 168 0 rtable 226 10K 11K 166960K 457 0 pf 42 19K 23K 166960K 107 0 ifaddr 40 6K 7K 166960K 70 0 ifgroup 59 2K 2K 166960K 114 0 sysctl 3 1K 9K 166960K 10 0 counters 70 37K 37K 166960K 126 0 ioctlops 0 0K 4K 166960K 1666 0 iov 1 12K 16K 166960K 33 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1343 85K 85K 166960K 2091 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 26 0 dirhash 12 2K 3K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 711 0 sigio 0 0K 0K 166960K 11 0 proc 72 91K 140K 166960K 617 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 51 0 in_multi 84 6K 7K 166960K 116 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 5 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 445 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 252 160K 179K 166960K 8252 0 UVM aobj 17 2K 4K 166960K 18 0 pinsyscall 43 86K 104K 166960K 1798 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 32 0 NDP 13 0K 2K 166960K 47 0 temp 56 8690K 8818K 166960K 49662 0 kqueue 13 20K 32K 166960K 125 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 99 0 95 2 0 2 2 0 8 1 rtentry 176 124 0 27 6 0 6 6 0 8 0 unpcb 144 699 0 680 6 4 2 4 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 156 0 150 2 1 1 2 0 8 0 arp 128 18 0 2 1 0 1 1 0 8 0 inpcb 328 775 0 764 12 5 7 7 0 8 6 nd6 144 29 0 8 1 0 1 1 0 8 0 pkpcb 40 8 0 8 3 3 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 21 0 21 2 2 0 1 0 8 0 pppxif 1504 4 0 4 2 2 0 1 0 8 0 pffrag 232 8 0 0 1 0 1 1 0 482 0 pffrnode 88 8 0 0 1 0 1 1 0 8 0 pffrent 40 10 0 2 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 2 0 0 1 0 1 1 0 8 0 pfanchor 1288 2 0 2 1 1 0 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfqueue 320 2 0 2 1 1 0 1 0 8 0 pfstitem 24 68 0 25 1 0 1 1 0 8 0 pfstkey 128 68 0 22 2 0 2 2 0 8 0 pfstate 384 64 0 23 5 0 5 5 0 8 0 pfrule 1344 24 0 17 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 487 0 91 29 1 28 29 0 8 0 art_table 32 488 0 91 4 0 4 4 0 8 0 art_node 16 122 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 3 1 0 1 1 0 8 0 semapl 112 19 0 9 1 0 1 1 0 8 0 shmpl 112 15 0 1 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 2931 0 1426 95 0 95 95 0 8 0 ffsino 288 2931 0 1426 109 0 109 109 0 8 0 nchpl 144 3959 0 2261 64 0 64 64 0 8 0 rtmask 32 3 0 3 1 1 0 1 0 8 0 uvmvnodes 80 3305 0 0 68 0 68 68 0 8 0 vnodes 216 3305 0 0 184 0 184 184 0 8 0 namei 1024 13278 0 13278 2 1 1 2 0 8 1 percpumem 16 78 0 28 1 0 1 1 0 8 0 kstatmem 264 66 0 36 4 2 2 3 0 8 0 scsiplug 72 4 0 4 2 2 0 1 0 8 0 scxspl 216 15095 0 15094 10 3 7 8 1 8 6 plimitpl 152 180 0 162 1 0 1 1 0 8 0 sigapl 424 1013 0 961 7 1 6 7 0 8 0 knotepl 120 551 0 0 17 0 17 17 0 8 0 kqueuepl 224 219 0 207 2 0 2 2 0 8 0 pipepl 336 135 0 108 3 0 3 3 0 8 0 fdescpl 520 993 0 961 3 0 3 3 0 8 0 filepl 160 6230 0 6001 19 4 15 16 0 8 3 lockfpl 104 348 0 342 1 0 1 1 0 8 0 lockfspl 48 147 0 143 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 1439 0 1425 1 0 1 1 0 8 0 zombiepl 144 993 0 992 2 1 1 1 0 8 0 processpl 1240 1013 0 961 5 0 5 5 0 8 0 procpl 656 2036 0 1976 6 0 6 6 0 8 0 srpgc 96 1 0 1 1 1 0 1 0 8 0 sosppl 168 4 0 4 1 1 0 1 0 8 0 sockpl 728 1598 0 1564 14 4 10 10 0 8 6 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 89 0 0 12 0 12 12 0 8 0 mtagpl 96 115 0 0 3 0 3 3 0 8 0 mbufpl 256 295 0 0 19 0 19 19 0 8 0 bufpl 280 5398 0 124 377 0 377 377 0 8 0 anonpl 32 13557 0 0 110 0 110 110 0 246 0 amapchunkpl 152 26705 0 26114 39 14 25 29 0 158 2 amappl16 200 4018 0 3655 51 24 27 34 0 8 0 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 110 0 98 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1638 0 1606 4 2 2 3 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 269 0 269 1 1 0 1 0 8 0 amappl8 136 53 0 50 1 0 1 1 0 8 0 amappl7 128 109 0 96 1 0 1 1 0 8 0 amappl6 120 181 0 177 1 0 1 1 0 8 0 amappl5 112 125 0 115 1 0 1 1 0 8 0 amappl4 104 332 0 311 1 0 1 1 0 8 0 amappl3 96 5125 0 5007 5 1 4 4 0 8 0 amappl2 88 641 0 578 2 0 2 2 0 8 0 amappl1 80 10618 0 10012 17 2 15 15 0 8 1 amappl 88 7468 0 7291 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 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 7 0 7 2 2 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 17 0 1 1 0 1 1 0 8 0 uaddrrnd 24 993 0 961 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 993 0 961 1 0 1 1 0 8 0 vmmpekpl 168 9542 0 9501 3 0 3 3 0 8 0 vmmpepl 168 68422 0 66049 114 4 110 114 0 357 4 vmsppl 480 992 0 961 5 1 4 5 0 8 0 rwobjpl 72 23769 0 19176 84 0 84 84 0 8 0 pdppl 4096 1993 0 1922 111 40 71 87 0 8 0 pvpl 32 22222 0 0 179 0 179 179 0 265 0 pmappl 256 992 0 961 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 413 0 49 11 0 11 11 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(ffffffff83925120,9,0) at witness_checkorder+0x10fb sys/kern/subr_witness.c:-1 mtx_enter(ffffffff83925110) at mtx_enter+0x4a sys/kern/kern_lock.c:260 sleep_setup(ffff8000299dee50,220,ffffffff833aec99) at sleep_setup+0xc6 sys/kern/kern_synch.c:302 msleep_nsec(ffff8000299dee50,ffff8000299dedf0,220,ffffffff833aec99,ffffffffffffffff) at msleep_nsec+0x119 sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff800001481000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 dtclose(21e5f,81,2000,ffff8000ffff2a50) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff8000ffff2a50) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff800038ffb9d0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805dabc000,81,fffffd80097fb000,ffff8000ffff2a50) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bf37248,ffff8000ffff2a50) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bf37248,ffff8000ffff2a50) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bf37248,ffff8000ffff2a50) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806bf37248,ffff8000ffff2a50) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000ffff2a50) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000ffff2a50,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff8000ffff2a50,ffff800038ffbd40,ffff800038ffbc90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800038ffbd40) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038ffbd40) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7812c893f3e0, count: -17 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(ffff8000299dedf0) at mtx_enter+0xd2 sys/kern/kern_lock.c:264 clockintr_dispatch(ffff80002a228120) at clockintr_dispatch+0x3b4 sys/kern/kern_clockintr.c:215 lapic_clockintr(0,0) at lapic_clockintr+0x51 sys/arch/amd64/amd64/lapic.c:489 Xresume_lapic_ltimer() at Xresume_lapic_ltimer+0x2a acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu_x86.c:1218 sched_idle(ffff8000299ddff0) at sched_idle+0x4d8 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -9