witness: lock order reversal: 1st 0xffffffff839673d0 &sched_lock (&sched_lock) 2nd 0xffff8000299bee30 &cq->cq_mtx (&cq->cq_mtx) lock order [1] &sched_lock (&sched_lock) -> [2] &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 ast+0x15c mi_ast sys/sys/syscall_mi.h:252 [inline] #3 ast+0x15c sys/arch/amd64/amd64/trap.c:747 #4 intr_user_exit+0x3c lock order [2] &cq->cq_mtx (&cq->cq_mtx) -> [1] &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:1281 #9 closef+0x192 sys/kern/kern_descrip.c:1265 #10 fdfree+0x116 sys/kern/kern_descrip.c:1196 #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:783 #14 Xsyscall+0x128 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(ffff8000299bee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299bee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299be2f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 mi_switch() at mi_switch+0x187 sys/kern/sched_bsd.c:376 ast(ffff80002f7a5750) at ast+0x15c mi_ast sys/sys/syscall_mi.h:252 [inline] ast(ffff80002f7a5750) at ast+0x15c sys/arch/amd64/amd64/trap.c:747 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x72bf56aed5f0, count: -7 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002f7a5550 rbx 0 rdx 0 rcx 0xffff80003a3d8fb0 rax 0xffff8000299bdff0 r8 0xffff80002f7a5430 r9 0x8080808080808080 r10 0x63812be0008d4fcb r11 0x314a0532ffc68e6b r12 0xfffffd8004034300 r13 0xfffffd8004824d58 r14 0x3 r15 0xffffffff834bc58c substchar+0xb8d5 rip 0xffffffff814d2c05 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002f7a5540 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=8573 pid=32438 tcnt=2 stat=run flags process=4000000 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0x0, list=0xffff80003a3d9a10,0xffff80003a3d9cb8 process=0xffff80003c47f050 user=0xffff80002f7a0000, vmspace=0xfffffd806c7c07c0 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *32438 8573 24467 0 2 0x4000000 syz-executor 32438 302507 24467 0 2 0x4000000 syz-executor 4634 184239 94135 0 2 0 syz-executor 4634 144238 94135 0 3 0x4000080 fsleep syz-executor 4634 311341 94135 0 3 0x4000080 fsleep syz-executor 2151 256082 73486 0 2 0 syz-executor 2151 97460 73486 0 3 0x4000080 ttyretype syz-executor 95239 136667 14760 0 2 0 syz-executor 95239 244178 14760 0 3 0x4000080 fsleep syz-executor 76575 75071 7908 0 2 0 syz-executor 76575 48261 7908 0 3 0x4000080 fsleep syz-executor 79464 184394 0 0 3 0x14200 acct acct 24467 55598 68645 0 3 0x82 nanoslp syz-executor 72550 38903 0 0 3 0x14280 nfsidl nfsio 99139 52289 0 0 3 0x14280 nfsidl nfsio 31372 270167 0 0 3 0x14280 nfsidl nfsio 59748 229568 0 0 3 0x14280 nfsidl nfsio 7522 412271 0 0 3 0x14280 nfsidl nfsio 20908 129517 0 0 3 0x14280 nfsidl nfsio 5030 141541 0 0 3 0x14280 nfsidl nfsio 97928 61486 0 0 3 0x14280 nfsidl nfsio 10831 45157 0 0 3 0x14280 nfsidl nfsio 23679 446384 0 0 3 0x14280 nfsidl nfsio 33512 243501 0 0 3 0x14280 nfsidl nfsio 74294 8554 0 0 3 0x14280 nfsidl nfsio 54305 381632 0 0 3 0x14280 nfsidl nfsio 42174 174732 0 0 3 0x14280 nfsidl nfsio 5860 387793 0 0 3 0x14280 nfsidl nfsio 28864 505340 0 0 3 0x14280 nfsidl nfsio 45604 7752 0 0 3 0x14280 nfsidl nfsio 85716 155930 0 0 3 0x14280 nfsidl nfsio 9447 258296 0 0 3 0x14280 nfsidl nfsio 26684 475113 0 0 3 0x14280 nfsidl nfsio 73486 217257 68645 0 3 0x82 nanoslp syz-executor 58293 380574 68645 0 3 0x82 nanoslp syz-executor 7908 98637 68645 0 3 0x82 nanoslp syz-executor 82325 215249 68645 0 3 0x82 nanoslp syz-executor 94135 393769 68645 0 3 0x82 nanoslp syz-executor 14760 432491 68645 0 3 0x82 nanoslp syz-executor 52381 385302 68645 0 2 0x2 syz-executor 68645 68894 20356 0 3 0x82 kqread syz-executor 20356 359872 36952 0 3 0x10008a sigsusp ksh 36952 446140 52480 0 3 0x98 kqread sshd-session 52480 177216 64822 0 3 0x92 kqread sshd-session 61947 148022 1 0 3 0x100083 ttyopn getty 64822 82986 1 0 3 0x88 kqread sshd 82607 381511 43897 74 3 0x1100092 bpf pflogd 43897 65503 1 0 3 0x80 sbwait pflogd 92865 41547 47523 73 3 0x1100090 kqread syslogd 47523 345093 1 0 3 0x100082 sbwait syslogd 95085 508665 1 0 3 0x100080 kqread resolvd 73068 35300 66270 77 3 0x100092 kqread dhcpleased 23672 74816 66270 77 3 0x100092 kqread dhcpleased 66270 78626 1 0 3 0x80 kqread dhcpleased 41418 146209 0 0 3 0x14200 bored smr 2129 451227 0 0 2 0x14200 zerothread 19674 386051 0 0 3 0x14200 aiodoned aiodoned 82161 416281 0 0 3 0x14200 syncer update 54686 119162 0 0 3 0x14200 cleaner cleaner 7692 98622 0 0 3 0x14200 reaper reaper 37591 511989 0 0 3 0x14200 pgdaemon pagedaemon 32348 117245 0 0 3 0x14200 bored viomb 72726 289296 0 0 3 0x40014200 acpi0 acpi0 71056 89538 0 0 3 0x40014200 idle1 58727 95227 0 0 3 0x14200 bored softnet1 98674 9373 0 0 3 0x14200 bored softnet0 14247 16369 0 0 3 0x14200 bored systqmp 46513 247695 0 0 3 0x14200 bored systq 6350 51906 0 0 3 0x14200 tmoslp softclockmp 18987 381483 0 0 3 0x40014200 tmoslp softclock 14617 219259 0 0 3 0x40014200 idle0 1 49158 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff83acabb0) #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 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1 #3 pmap_do_remove+0x8af sys/arch/amd64/amd64/pmap.c:1939 #4 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1869 #5 uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] #5 uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 #6 exit1+0x6fc sys/kern/kern_exit.c:260 #7 sys_exit+0x1a sys/kern/kern_exit.c:-1 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff839673d0) #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 preempt+0x35 sys/kern/sched_bsd.c:338 #3 ast+0x15c mi_ast sys/sys/syscall_mi.h:252 [inline] #3 ast+0x15c sys/arch/amd64/amd64/trap.c:747 #4 intr_user_exit+0x3c Process 52381 (syz-executor) thread 0xffff8000ffffd230 (385302) exclusive rrwlock inode r = 0 (0xfffffd806f079488) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3143 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d6d40b0) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3128 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11081 12119K 12352K 166960K 12686 0 pcb 17 15K 16K 166960K 128 0 rtable 209 14K 15K 166960K 444 0 pf 40 18K 25K 166960K 99 0 ifaddr 41 6K 8K 166960K 64 0 ifgroup 60 2K 2K 166960K 96 0 sysctl 4 1K 9K 166960K 8 0 counters 74 37K 38K 166960K 96 0 ioctlops 0 0K 4K 166960K 1582 0 iov 0 0K 16K 166960K 81 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1323 83K 84K 166960K 1738 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 26 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 93K 166960K 520 0 sigio 0 0K 0K 166960K 3 0 proc 72 115K 180K 166960K 618 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 48 0 in_multi 85 6K 7K 166960K 119 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 22 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 491 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 228 151K 173K 166960K 6627 0 UVM aobj 17 2K 2K 166960K 19 0 pinsyscall 41 82K 105K 166960K 1713 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 12 0 NDP 14 0K 2K 166960K 44 0 temp 56 9082K 9148K 166960K 24330 0 kqueue 13 20K 29K 166960K 86 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 55 0 52 1 0 1 1 0 8 0 rtentry 176 132 0 42 6 0 6 6 0 8 0 unpcb 144 339 0 319 6 0 6 6 0 8 4 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpcb 736 130 0 126 4 0 4 4 0 8 3 arp 136 21 0 5 1 0 1 1 0 8 0 inpcb 328 516 0 507 7 3 4 7 0 8 3 nd6 152 31 0 7 2 0 2 2 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 7 0 7 1 0 1 1 0 8 1 pfstscr 40 3 0 2 1 0 1 1 0 8 0 pffrag 232 8 0 3 1 0 1 1 0 482 0 pffrnode 88 7 0 2 1 0 1 1 0 8 0 pffrent 40 14 0 9 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 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfstlim 224 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pfstitem 24 48 0 1 1 0 1 1 0 8 0 pfstkey 128 50 0 4 2 0 2 2 0 8 0 pfstate 448 49 0 3 6 0 6 6 0 8 0 pfrule 1360 30 0 24 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 588 0 179 30 0 30 30 0 8 3 art_table 40 590 0 179 5 0 5 5 0 8 0 art_node 32 132 0 51 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 4 1 0 1 1 0 8 0 semapl 112 24 0 14 1 0 1 1 0 8 0 shmpl 112 16 0 2 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2301 0 838 93 0 93 93 0 8 0 ffsino 296 2301 0 838 114 0 114 114 0 8 0 nchpl 144 3057 0 1354 64 0 64 64 0 8 0 vnodes 216 2594 0 0 145 0 145 145 0 8 0 namei 1024 10033 0 10032 2 1 1 2 0 8 0 percpumem 16 63 0 11 1 0 1 1 0 8 0 kstatmem 264 54 0 22 3 0 3 3 0 8 0 scsiplug 72 6 0 6 1 0 1 1 0 8 1 scxspl 216 10611 0 10611 11 3 8 8 1 8 8 plimitpl 152 153 0 133 1 0 1 1 0 8 0 sigapl 424 858 0 790 9 1 8 8 0 8 0 knotepl 120 321 0 0 10 0 10 10 0 8 0 kqueuepl 224 124 0 115 2 1 1 2 0 8 0 pipepl 344 182 0 155 6 0 6 6 0 8 3 fdescpl 528 820 0 790 3 0 3 3 0 8 0 filepl 160 4390 0 4170 17 2 15 15 0 8 4 lockfpl 104 187 0 185 1 0 1 1 0 8 0 lockfspl 48 79 0 77 1 0 1 1 0 8 0 sessionpl 144 97 0 88 1 0 1 1 0 8 0 pgrppl 48 112 0 95 1 0 1 1 0 8 0 ucredpl 104 542 0 528 1 0 1 1 0 8 0 zombiepl 144 792 0 790 1 0 1 1 0 8 0 processpl 1232 858 0 790 7 1 6 6 0 8 0 procpl 664 1510 0 1436 8 0 8 8 0 8 0 sockpl 752 919 0 887 19 7 12 17 0 8 8 mcl64k 65536 19 0 0 3 0 3 3 0 8 1 mcl16k 16384 2 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 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 14 0 0 1 0 1 1 0 8 0 mbufpl 256 160 0 0 10 0 10 10 0 8 0 bufpl 280 3503 0 108 243 0 243 243 0 8 0 anonpl 32 6265 0 0 52 1 51 52 0 246 0 amapchunkpl 152 20685 0 20220 29 0 29 29 0 158 9 amappl16 200 2534 0 2508 7 3 4 5 0 8 2 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 453 0 452 1 0 1 1 0 8 0 amappl13 176 201 0 189 1 0 1 1 0 8 0 amappl12 168 1079 0 1049 2 0 2 2 0 8 0 amappl11 160 5 0 4 1 0 1 1 0 8 0 amappl10 152 98 0 84 1 0 1 1 0 8 0 amappl9 144 267 0 267 1 1 0 1 0 8 0 amappl8 136 115 0 113 1 0 1 1 0 8 0 amappl7 128 155 0 141 1 0 1 1 0 8 0 amappl6 120 173 0 171 1 0 1 1 0 8 0 amappl5 112 104 0 93 1 0 1 1 0 8 0 amappl4 104 305 0 282 1 0 1 1 0 8 0 amappl3 96 4006 0 3895 4 0 4 4 0 8 0 amappl2 88 617 0 554 2 0 2 2 0 8 0 amappl1 80 12277 0 11677 16 0 16 16 0 8 0 amappl 88 5804 0 5645 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 2 0 1 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 1 1 1 0 8 1 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 18 0 2 1 0 1 1 0 8 0 uaddrrnd 24 820 0 789 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 820 0 789 1 0 1 1 0 8 0 vmmpekpl 168 9002 0 8962 3 0 3 3 0 8 0 vmmpepl 168 60817 0 58918 99 0 99 99 0 357 11 vmsppl 488 819 0 789 5 0 5 5 0 8 0 rwobjpl 80 19706 0 18660 27 0 27 27 0 8 4 pdppl 4096 1647 0 1578 107 32 75 85 0 8 6 pvpl 32 14203 0 0 115 0 115 115 0 265 0 pmappl 256 819 0 789 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 289 0 36 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83931ff0) 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_pc() at __sanitizer_cov_trace_pc+0x44 sys/dev/kcov.c:159 wakeup_n(ffffffff83acaa00,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:581 uvm_pmr_freepages(fffffd8008733d58,1) at uvm_pmr_freepages+0x3eb atomic_load_sint sys/uvm/uvmexp.h:-1 [inline] uvm_pmr_freepages(fffffd8008733d58,1) at uvm_pmr_freepages+0x3eb sys/uvm/uvm_pmemrange.c:1343 pmap_do_remove(fffffd806c7d3500,3f1c1b34000,3f1c1b56000,0) at pmap_do_remove+0x8af sys/arch/amd64/amd64/pmap.c:1939 uvm_unmap_kill_entry_withlock(fffffd806c7c05d8,fffffd806c6faad8,0) at uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1869 uvm_map_teardown(fffffd806c7c05d8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c7c05d8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003a3d9a10,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003a3d9a10,ffff80002f7abb70,ffff80002f7abac0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f7abb70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f7abb70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f34c68d53d0, count: -13 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(ffff8000299bee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299bee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299be2f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 mi_switch() at mi_switch+0x187 sys/kern/sched_bsd.c:376 ast(ffff80002f7a5750) at ast+0x15c mi_ast sys/sys/syscall_mi.h:252 [inline] ast(ffff80002f7a5750) at ast+0x15c sys/arch/amd64/amd64/trap.c:747 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x72bf56aed5f0, count: -7