witness: lock order reversal: 1st 0xffffffff83838e00 &cq->cq_mtx (&cq->cq_mtx) 2nd 0xffffffff83901690 &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:252 #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: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:252 #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:369 #3 ast+0x165 mi_ast sys/sys/syscall_mi.h:252 [inline] #3 ast+0x165 sys/arch/amd64/amd64/trap.c:543 #4 Xsyscall+0x156 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(ffffffff83901690,9,0) at witness_checkorder+0x10fb sys/kern/subr_witness.c:-1 mtx_enter(ffffffff83901680) at mtx_enter+0x4a sys/kern/kern_lock.c:252 sleep_setup(ffffffff83838e50,220,ffffffff833b0cb0) at sleep_setup+0xc6 sys/kern/kern_synch.c:302 msleep_nsec(ffffffff83838e50,ffffffff83838df0,220,ffffffff833b0cb0,ffffffffffffffff) at msleep_nsec+0x119 sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff80000147f000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 dtclose(31e5f,81,2000,ffff80002a2979c0) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(31e5f,81,2000,ffff80002a2979c0) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c414ec0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f908290,81,fffffd80097fb548,ffff80002a2979c0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c1079a0,ffff80002a2979c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c1079a0,ffff80002a2979c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c1079a0,ffff80002a2979c0) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806c1079a0,ffff80002a2979c0) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80002a2979c0) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80002a2979c0,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80002a2979c0,ffff80003c415230,ffff80003c415180) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c415230) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c415230) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c2507102d10, count: -17 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c414bc0 rbx 0xfffffd8004746c48 rdx 0 rcx 0xffff80002a2979c0 rax 0xffff8000299ddff0 r8 0xffff80003c414aa0 r9 0x8080808080808080 r10 0xefae7382dc4e6621 r11 0x9e8b3eda01d97ed r12 0 r13 0xfffffd8003f56300 r14 0x3 r15 0xffffffff rip 0xffffffff82a95135 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c414bb0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=83575 pid=34469 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a2979c0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c49b748,0xffffffff839341b0 process=0xffff80003c49d388 user=0xffff80003c410000, vmspace=0xfffffd806c212978 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 83739 150642 77850 0 3 0x80 nanoslp syz-executor 83739 166723 77850 0 3 0x4000080 fsleep syz-executor 83739 412774 77850 0 3 0x4000080 fsleep syz-executor 54931 206484 40156 0 3 0x80 fsleep syz-executor 54931 240659 40156 0 3 0x4000080 fifor syz-executor 54931 306192 40156 0 3 0x4000080 fifor syz-executor 42393 446975 20838 0 3 0x80 fsleep syz-executor 42393 313306 20838 0 3 0x4000080 sbwait syz-executor 98901 408063 1841 0 3 0x80 fsleep syz-executor 98901 289717 1841 0 3 0x4000080 kqsel syz-executor 74930 223165 67721 0 3 0x80 fsleep syz-executor 74930 97255 67721 0 3 0x4000080 fifor syz-executor 31515 329592 0 0 3 0x14200 bored sosplice 86550 245969 0 0 3 0x14280 nfsidl nfsio 75706 324202 0 0 3 0x14280 nfsidl nfsio 15618 410981 0 0 3 0x14280 nfsidl nfsio 51078 453493 0 0 3 0x14280 nfsidl nfsio 30575 468136 0 0 3 0x14280 nfsidl nfsio 16593 39718 0 0 3 0x14280 nfsidl nfsio 78481 162203 0 0 3 0x14280 nfsidl nfsio 37126 206674 0 0 3 0x14280 nfsidl nfsio 33895 107684 0 0 3 0x14280 nfsidl nfsio 56324 22524 0 0 3 0x14280 nfsidl nfsio 58395 311791 0 0 3 0x14280 nfsidl nfsio 95573 346314 0 0 3 0x14280 nfsidl nfsio 50374 19232 0 0 3 0x14280 nfsidl nfsio 90478 88356 0 0 3 0x14280 nfsidl nfsio 54847 25353 0 0 3 0x14280 nfsidl nfsio 19434 358904 0 0 3 0x14280 nfsidl nfsio 88121 262340 0 0 3 0x14280 nfsidl nfsio 37805 5212 0 0 3 0x14280 nfsidl nfsio 12936 192155 0 0 3 0x14280 nfsidl nfsio 30291 521320 0 0 3 0x14280 nfsidl nfsio 30023 87788 1 0 3 0x100083 ttyin getty 69990 450070 35180 0 3 0x82 nanoslp syz-executor 77850 13110 35180 0 3 0x82 nanoslp syz-executor 20838 391730 35180 0 3 0x82 nanoslp syz-executor 67721 393783 35180 0 3 0x82 nanoslp syz-executor 40156 400729 35180 0 3 0x82 nanoslp syz-executor 10558 217355 35180 0 3 0x82 nanoslp syz-executor 43886 477178 35180 0 3 0x82 wait syz-executor 1841 264589 35180 0 3 0x82 nanoslp syz-executor 35180 269829 83766 0 3 0x82 kqread syz-executor 83766 213173 73623 0 3 0x10008a sigsusp ksh 73623 516127 53431 0 3 0x98 kqread sshd-session 53431 421796 81039 0 3 0x92 kqread sshd-session 81039 300231 1 0 3 0x88 kqread sshd 39418 44995 93067 74 3 0x1100092 bpf pflogd 93067 514100 1 0 3 0x80 sbwait pflogd 88135 472066 60630 73 3 0x1100090 kqread syslogd 60630 458113 1 0 3 0x100082 sbwait syslogd 84791 12486 1 0 3 0x100080 kqread resolvd 68750 21373 28078 77 3 0x100092 kqread dhcpleased 60024 140500 28078 77 3 0x100092 kqread dhcpleased 28078 235437 1 0 3 0x80 kqread dhcpleased 37973 504246 0 0 3 0x14200 bored smr 38779 170032 0 0 3 0x14200 pgzero zerothread 48646 447757 0 0 3 0x14200 aiodoned aiodoned 15658 76307 0 0 3 0x14200 syncer update 3697 179095 0 0 3 0x14200 cleaner cleaner 98756 348787 0 0 3 0x14200 reaper reaper 44527 149683 0 0 3 0x14200 pgdaemon pagedaemon 18873 160492 0 0 3 0x14200 bored viomb 42505 387424 0 0 3 0x40014200 acpi0 acpi0 45891 121973 0 0 3 0x40014200 idle1 29135 287154 0 0 3 0x14200 bored softnet3 40632 137853 0 0 3 0x14200 bored softnet2 72075 519566 0 0 3 0x14200 bored softnet1 72333 397849 0 0 3 0x14200 bored softnet0 3540 303798 0 0 3 0x14200 bored systqmp 64067 477812 0 0 3 0x14200 bored systq 32238 317525 0 0 3 0x14200 tmoslp softclockmp 39070 395445 0 0 3 0x40014200 tmoslp softclock 65795 194679 0 0 3 0x40014200 idle0 1 238421 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex amapchunkpl r = 0 (0xffffffff8398ca38) #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:296 #2 mtx_enter+0x62 sys/kern/kern_lock.c:253 #3 pool_put+0xa6 sys/kern/subr_pool.c:796 #4 amap_free+0x1b2 sys/uvm/uvm_amap.c:-1 #5 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #6 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 #7 exit1+0x723 sys/kern/kern_exit.c:260 #8 sys_exit+0x1a sys/kern/kern_exit.c:-1 #9 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #10 Xsyscall+0x128 CPU 1: exclusive mutex &cq->cq_mtx r = 0 (0xffffffff83838e00) #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:296 #2 mtx_enter+0x137 sys/kern/kern_lock.c:253 #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:579 #15 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10222 11141K 11357K 166960K 11699 0 pcb 17 12K 12K 166960K 45 0 rtable 215 8K 9K 166960K 417 0 pf 37 18K 18K 166960K 73 0 ifaddr 43 7K 8K 166960K 66 0 ifgroup 59 2K 2K 166960K 92 0 sysctl 2 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 112 0 ioctlops 0 0K 4K 166960K 1552 0 iov 1 2K 28K 166960K 16 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1349 85K 85K 166960K 1530 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 337 0 sigio 0 0K 0K 166960K 68 0 proc 73 91K 152K 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 33 0 in_multi 92 6K 7K 166960K 114 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 390 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 246 168K 186K 166960K 4813 0 UVM aobj 9 2K 2K 166960K 9 0 pinsyscall 42 84K 104K 166960K 1454 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 13 0K 1K 166960K 39 0 temp 45 8688K 8752K 166960K 5082 0 kqueue 13 20K 28K 166960K 71 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 54 0 51 1 0 1 1 0 8 0 rtentry 176 125 0 31 6 0 6 6 0 8 0 unpcb 144 141 0 118 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 808 125 0 118 7 0 7 7 0 8 6 arp 128 19 0 1 1 0 1 1 0 8 0 inpcb 328 300 0 290 7 0 7 7 0 8 5 nd6 144 26 0 3 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 16 0 16 1 0 1 1 0 8 1 pppxif 1504 5 0 5 1 0 1 1 0 8 1 pffrag 232 6 0 0 1 0 1 1 0 482 0 pffrnode 88 5 0 0 1 0 1 1 0 8 0 pffrent 40 6 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 384 37 0 1 4 0 4 4 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 527 0 113 30 1 29 30 0 8 2 art_table 32 528 0 113 4 0 4 4 0 8 0 art_node 16 121 0 37 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 4 1 0 1 1 0 8 0 semapl 112 5 0 0 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1960 0 446 95 0 95 95 0 8 0 ffsino 288 1960 0 446 109 0 109 109 0 8 0 nchpl 144 2433 0 733 64 0 64 64 0 8 0 rtmask 32 3 0 3 1 0 1 1 0 8 1 uvmvnodes 80 2134 0 0 44 0 44 44 0 8 0 vnodes 216 2134 0 0 119 0 119 119 0 8 0 namei 1024 7754 0 7754 1 0 1 1 0 8 1 percpumem 16 71 0 21 1 0 1 1 0 8 0 kstatmem 264 50 0 20 3 0 3 3 0 8 1 scxspl 216 9413 0 9413 9 3 6 7 1 8 6 plimitpl 152 48 0 31 1 0 1 1 0 8 0 sigapl 424 667 0 596 8 0 8 8 0 8 0 knotepl 120 525 0 0 16 0 16 16 0 8 0 kqueuepl 224 104 0 93 2 0 2 2 0 8 1 pipepl 336 157 0 130 6 1 5 6 0 8 2 fdescpl 520 628 0 597 3 0 3 3 0 8 0 filepl 160 3010 0 2784 16 0 16 16 0 8 6 lockfpl 104 33 0 30 1 0 1 1 0 8 0 lockfspl 48 18 0 15 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 69 0 52 1 0 1 1 0 8 0 ucredpl 104 269 0 256 1 0 1 1 0 8 0 zombiepl 144 599 0 596 1 0 1 1 0 8 0 processpl 1240 667 0 596 6 0 6 6 0 8 0 procpl 656 1037 0 959 8 0 8 8 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 728 501 0 461 9 0 9 9 0 8 5 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 191 0 0 12 0 12 12 0 8 0 bufpl 280 2966 0 127 203 0 203 203 0 8 0 anonpl 32 5500 0 0 45 0 45 45 0 246 0 amapchunkpl 152 15003 0 14496 29 1 28 29 0 158 7 amappl16 200 1959 0 1928 5 3 2 5 0 8 0 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 118 0 105 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 1288 0 1256 4 2 2 3 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 18 0 16 1 0 1 1 0 8 0 amappl7 128 117 0 104 1 0 1 1 0 8 0 amappl6 120 189 0 186 1 0 1 1 0 8 0 amappl5 112 124 0 115 1 0 1 1 0 8 0 amappl4 104 322 0 303 1 0 1 1 0 8 0 amappl3 96 2669 0 2553 5 1 4 4 0 8 0 amappl2 88 658 0 596 2 0 2 2 0 8 0 amappl1 80 9302 0 8700 15 1 14 15 0 8 0 amappl 88 4085 0 3913 5 0 5 5 0 92 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 128 253 0 253 1 1 0 1 0 8 0 dma64 64 7 0 7 2 1 1 1 0 8 1 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 628 0 597 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 628 0 597 1 0 1 1 0 8 0 vmmpekpl 168 7009 0 6970 3 0 3 3 0 8 0 vmmpepl 168 45894 0 43879 92 0 92 92 0 357 3 vmsppl 480 627 0 596 5 0 5 5 0 8 0 rwobjpl 72 17023 0 13945 57 1 56 56 0 8 0 pdppl 4096 1263 0 1192 101 28 73 85 0 8 2 pvpl 32 14117 0 0 114 0 114 114 0 265 0 pmappl 256 627 0 596 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 394 0 33 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83837ff0) 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(ffffffff83838df0) at mtx_enter+0xdd sys/kern/kern_lock.c:256 clockintr_dispatch(ffff8000377f5430) 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 spllower(9) at spllower+0xb8 sys/arch/amd64/amd64/intr.c:811 mtx_enter_try(ffffffff8398ca28) at mtx_enter_try+0x1ad sys/kern/kern_lock.c:296 mtx_enter(ffffffff8398ca28) at mtx_enter+0x62 sys/kern/kern_lock.c:253 pool_put(ffffffff8398ca20,fffffd806ea542f8) at pool_put+0xa6 sys/kern/subr_pool.c:796 amap_free(fffffd80772c9ab8) at amap_free+0x1b2 sys/uvm/uvm_amap.c:-1 uvm_unmap_detach(ffff8000377f56c0,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 uvm_map_teardown(fffffd806c212b58) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 exit1(ffff8000ffff27c0,0,0,1) at exit1+0x723 sys/kern/kern_exit.c:260 sys_exit(ffff8000ffff27c0,ffff8000377f5890,ffff8000377f57e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000377f5890) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000377f5890) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76577229a930, count: -18 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(ffffffff83901690,9,0) at witness_checkorder+0x10fb sys/kern/subr_witness.c:-1 mtx_enter(ffffffff83901680) at mtx_enter+0x4a sys/kern/kern_lock.c:252 sleep_setup(ffffffff83838e50,220,ffffffff833b0cb0) at sleep_setup+0xc6 sys/kern/kern_synch.c:302 msleep_nsec(ffffffff83838e50,ffffffff83838df0,220,ffffffff833b0cb0,ffffffffffffffff) at msleep_nsec+0x119 sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff80000147f000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 dtclose(31e5f,81,2000,ffff80002a2979c0) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(31e5f,81,2000,ffff80002a2979c0) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c414ec0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f908290,81,fffffd80097fb548,ffff80002a2979c0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c1079a0,ffff80002a2979c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c1079a0,ffff80002a2979c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c1079a0,ffff80002a2979c0) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806c1079a0,ffff80002a2979c0) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80002a2979c0) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80002a2979c0,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80002a2979c0,ffff80003c415230,ffff80003c415180) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c415230) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c415230) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c2507102d10, count: -17