witness: lock order reversal: 1st 0xffffffff838d1358 &sched_lock (&sched_lock) 2nd 0xffff8000299dee30 &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 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #4 msleep_nsec+0x132 sys/kern/kern_synch.c:219 #5 single_thread_set+0x1de sys/kern/kern_sig.c:2336 #6 sys_unveil+0x117 sys/kern/vfs_syscalls.c:981 #7 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #8 Xsyscall+0x128 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: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:775 #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(ffff8000299dee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299dee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299de2f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 mi_switch() at mi_switch+0x187 sys/kern/sched_bsd.c:376 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 msleep_nsec(ffff8000fffe8b28,ffff8000fffe8ac0,20,ffffffff833adf00,ffffffffffffffff) at msleep_nsec+0x132 sys/kern/kern_synch.c:219 single_thread_set(ffff8000fffe6550,2) at single_thread_set+0x1de sys/kern/kern_sig.c:2336 sys_unveil(ffff8000fffe6550,ffff80003c42dde0,ffff80003c42dd30) at sys_unveil+0x117 sys/kern/vfs_syscalls.c:981 syscall(ffff80003c42dde0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c42dde0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbf8ca067bc0, count: -11 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c42d8e0 rbx 0 rdx 0 rcx 0xffff8000fffe6550 rax 0xffff8000299ddff0 r8 0xffff80003c42d7c0 r9 0x8080808080808080 r10 0x627519a18724c7b1 r11 0xddf93bc20e33ef10 r12 0xfffffd8003f4c300 r13 0xfffffd800473cd58 r14 0x3 r15 0xffffffff8341e467 substchar+0x54c7 rip 0xffffffff81f801e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c42d8d0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=171856 pid=46774 tcnt=4 stat=sleep flags process=4002000 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0xffff8000fffe8b28, wmesg=suspend, ps_single=0xffff8000fffe6550 scnt=3 ecnt=0 forw=0x0, list=0xffff8000fffe6020,0xffff8000fffef250 process=0xffff8000fffe89b8 user=0xffff80003c428000, vmspace=0xfffffd807299f018 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 31495 199953 5802 0 2 0 syz-executor 31495 28134 5802 0 3 0x4000000 biowait syz-executor 46774 47412 38259 0 2 0x4082000 syz-executor 46774 256830 38259 0 2 0x4082000 syz-executor *46774 171856 38259 0 3 0x4002000 suspend syz-executor 46774 164335 38259 0 7 0x4082000 syz-executor 15760 454207 52399 0 2 0 syz-executor 15760 139806 52399 0 2 0x4000000 syz-executor 62294 394147 14646 0 2 0 syz-executor 62294 91356 14646 0 3 0x4000080 fsleep syz-executor 62294 260149 14646 0 2 0x4000000 syz-executor 67878 145456 41042 0 2 0 syz-executor 67878 152139 41042 0 3 0x4000080 fsleep syz-executor 2832 494979 52149 0 2 0 syz-executor 45902 35496 10921 0 2 0x10 syz-executor 45902 280303 10921 0 2 0x4000010 syz-executor 45902 247652 10921 0 3 0x4000090 fsleep syz-executor 42820 124294 0 0 3 0x14200 acct acct 5802 438725 72060 0 3 0x82 nanoslp syz-executor 37947 298843 72060 0 2 0x2 syz-executor 10921 308583 72060 0 2 0x2 syz-executor 38259 443894 72060 0 3 0x82 nanoslp syz-executor 14646 174741 72060 0 3 0x82 nanoslp syz-executor 52399 196596 72060 0 3 0x82 nanoslp syz-executor 41042 321336 72060 0 3 0x82 nanoslp syz-executor 52149 64243 72060 0 3 0x82 nanoslp syz-executor 72060 171977 85392 0 3 0x82 kqread syz-executor 85392 494525 40282 0 3 0x10008a sigsusp ksh 40282 28388 97108 0 3 0x98 kqread sshd-session 97108 39113 83767 0 3 0x92 kqread sshd-session 21630 475721 1 0 3 0x100083 ttyin getty 83767 442191 1 0 3 0x88 kqread sshd 21921 52797 21264 74 3 0x1100092 bpf pflogd 21264 256726 1 0 3 0x80 sbwait pflogd 17006 255777 78865 73 3 0x1100090 kqread syslogd 78865 112158 1 0 3 0x100082 sbwait syslogd 98276 113959 1 0 3 0x100080 kqread resolvd 35196 286819 42872 77 3 0x100092 kqread dhcpleased 93084 338576 42872 77 3 0x100092 kqread dhcpleased 42872 77567 1 0 3 0x80 kqread dhcpleased 77074 42085 0 0 3 0x14200 bored smr 94976 393858 0 0 2 0x14200 zerothread 20259 138604 0 0 3 0x14200 aiodoned aiodoned 91298 468790 0 0 3 0x14200 syncer update 10591 523149 0 0 3 0x14200 cleaner cleaner 35615 348327 0 0 3 0x14200 reaper reaper 78084 29775 0 0 3 0x14200 pgdaemon pagedaemon 28666 356374 0 0 3 0x14200 bored viomb 3320 443271 0 0 3 0x40014200 acpi0 acpi0 29478 452816 0 0 3 0x40014200 idle1 29768 66156 0 0 3 0x14200 bored softnet1 56914 295842 0 0 3 0x14200 bored softnet0 36488 209757 0 0 3 0x14200 bored systqmp 65317 377771 0 0 3 0x14200 bored systq 14520 157684 0 0 3 0x14200 tmoslp softclockmp 51314 408847 0 0 3 0x40014200 tmoslp softclock 7227 269298 0 0 3 0x40014200 idle0 1 389014 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &pr->ps_mtx r = 0 (0xffff8000fffe8ad0) #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 userret+0x79 proc_suspend_check sys/kern/kern_sig.c:2281 [inline] #2 userret+0x79 sys/kern/kern_sig.c:2194 #3 syscall+0x9cd mi_syscall_return sys/sys/syscall_mi.h:203 [inline] #3 syscall+0x9cd sys/arch/amd64/amd64/trap.c:796 #4 Xsyscall+0x128 CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff838d1358) #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 sleep_finish+0x1d6 sys/kern/kern_synch.c:357 #3 msleep_nsec+0x132 sys/kern/kern_synch.c:219 #4 single_thread_set+0x1de sys/kern/kern_sig.c:2336 #5 sys_unveil+0x117 sys/kern/vfs_syscalls.c:981 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 Process 31495 (syz-executor) thread 0xffff8000fffe6d18 (28134) exclusive rrwlock inode r = 0 (0xfffffd806bc5ca28) #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:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806bc5c0e8) #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:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10196 11040K 11433K 166960K 11615 0 pcb 18 12K 12K 166960K 59 0 rtable 250 9K 9K 166960K 382 0 pf 35 17K 19K 166960K 71 0 ifaddr 43 7K 8K 166960K 61 0 ifgroup 55 2K 2K 166960K 83 0 sysctl 3 1K 9K 166960K 8 0 counters 70 37K 38K 166960K 110 0 ioctlops 0 0K 4K 166960K 1581 0 iov 0 0K 12K 166960K 14 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1372 86K 87K 166960K 1641 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 35 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 300 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 164K 166960K 545 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 11 0 in_multi 99 7K 7K 166960K 112 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 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 391 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 234 160K 173K 166960K 4580 0 UVM aobj 6 2K 4K 166960K 8 0 pinsyscall 42 84K 99K 166960K 1442 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 47 0 NDP 12 0K 2K 166960K 40 0 temp 41 8671K 8738K 166960K 14469 0 kqueue 13 20K 28K 166960K 55 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 40 0 36 1 0 1 1 0 8 0 rtentry 176 114 0 4 6 0 6 6 0 8 1 unpcb 144 117 0 100 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 39 0 34 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 190 0 179 2 0 2 2 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 17 0 17 1 0 1 1 0 8 1 pppxif 1504 3 0 3 1 0 1 1 0 8 1 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 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 31 0 0 1 0 1 1 0 8 0 pfstkey 128 35 0 4 2 0 2 2 0 8 1 pfstate 448 33 0 2 4 0 4 4 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 488 0 35 31 0 31 31 0 8 2 art_table 40 489 0 35 5 0 5 5 0 8 0 art_node 32 114 0 14 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 112 33 0 32 1 0 1 1 0 8 0 shmpl 112 4 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1977 0 465 96 0 96 96 0 8 0 ffsino 296 1977 0 465 118 0 118 118 0 8 1 nchpl 144 2396 0 700 64 0 64 64 0 8 0 rtmask 32 6 0 6 1 0 1 1 0 8 1 vnodes 216 2189 0 0 122 0 122 122 0 8 0 namei 1024 7942 0 7941 1 0 1 1 0 8 0 percpumem 16 70 0 20 1 0 1 1 0 8 0 vmpool 848 1 0 1 1 0 1 1 0 8 1 kstatmem 264 46 0 20 3 0 3 3 0 8 1 scxspl 216 9597 0 9596 3 2 1 2 1 8 0 plimitpl 152 81 0 63 1 0 1 1 0 8 0 sigapl 424 619 0 571 7 1 6 7 0 8 0 knotepl 120 330 0 0 10 0 10 10 0 8 0 kqueuepl 224 68 0 58 2 0 2 2 0 8 1 pipepl 344 126 0 99 3 0 3 3 0 8 0 fdescpl 528 597 0 566 3 0 3 3 0 8 0 filepl 160 3000 0 2783 13 0 13 13 0 8 2 lockfpl 104 47 0 45 1 0 1 1 0 8 0 lockfspl 48 23 0 21 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 131 0 114 1 0 1 1 0 8 0 ucredpl 104 541 0 527 1 0 1 1 0 8 0 zombiepl 144 571 0 571 1 0 1 1 0 8 1 processpl 1232 619 0 571 5 0 5 5 0 8 0 procpl 664 916 0 858 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 349 0 317 5 0 5 5 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 39 0 0 5 0 5 5 0 8 0 mtagpl 96 10 0 0 1 0 1 1 0 8 0 mbufpl 256 262 0 0 17 0 17 17 0 8 0 bufpl 280 3844 0 140 265 0 265 265 0 8 0 anonpl 32 10566 0 0 86 0 86 86 0 246 0 amapchunkpl 152 14093 0 13625 28 0 28 28 0 158 7 amappl16 200 2658 0 2630 23 9 14 19 0 8 8 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 433 0 432 1 0 1 1 0 8 0 amappl12 168 962 0 921 3 0 3 3 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 52 0 38 1 0 1 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 86 0 84 1 0 1 1 0 8 0 amappl6 120 290 0 277 1 0 1 1 0 8 0 amappl5 112 75 0 65 1 0 1 1 0 8 0 amappl4 104 422 0 393 1 0 1 1 0 8 0 amappl3 96 2401 0 2296 5 1 4 4 0 8 0 amappl2 88 538 0 479 2 0 2 2 0 8 0 amappl1 80 10024 0 9428 14 0 14 14 0 8 0 amappl 88 3815 0 3658 5 0 5 5 0 92 0 uvmvnodes 80 108 0 0 3 0 3 3 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 128 253 0 253 1 1 0 1 0 8 0 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 7 0 2 1 0 1 1 0 8 0 uaddrrnd 24 597 0 566 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 597 0 566 1 0 1 1 0 8 0 vmmpekpl 168 6734 0 6702 2 0 2 2 0 8 0 vmmpepl 168 46104 0 44204 99 0 99 99 0 357 7 vmsppl 488 596 0 566 5 0 5 5 0 8 1 rwobjpl 80 16174 0 15149 28 0 28 28 0 8 3 pdppl 4096 1204 0 1134 100 28 72 84 0 8 2 pvpl 32 19393 0 0 157 0 157 157 0 265 0 pmappl 256 597 0 567 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 285 0 30 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(ffffffff837c5ff0) 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(ffffffff838d1348) at mtx_enter+0x377 sys/kern/kern_lock.c:454 proc_suspend_check_locked(ffff8000fffef240,0) at proc_suspend_check_locked+0x1ac sys/kern/kern_sig.c:2264 userret(ffff8000fffef240) at userret+0x8c proc_suspend_check sys/kern/kern_sig.c:-1 [inline] userret(ffff8000fffef240) at userret+0x8c sys/kern/kern_sig.c:2194 syscall(ffff80003c433860) at syscall+0x9cd mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c433860) at syscall+0x9cd sys/arch/amd64/amd64/trap.c:796 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbf98b4f4130, count: -8 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(ffff8000299dee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299dee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299de2f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 mi_switch() at mi_switch+0x187 sys/kern/sched_bsd.c:376 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 msleep_nsec(ffff8000fffe8b28,ffff8000fffe8ac0,20,ffffffff833adf00,ffffffffffffffff) at msleep_nsec+0x132 sys/kern/kern_synch.c:219 single_thread_set(ffff8000fffe6550,2) at single_thread_set+0x1de sys/kern/kern_sig.c:2336 sys_unveil(ffff8000fffe6550,ffff80003c42dde0,ffff80003c42dd30) at sys_unveil+0x117 sys/kern/vfs_syscalls.c:981 syscall(ffff80003c42dde0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c42dde0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbf8ca067bc0, count: -11