panic: kernel diagnostic assertion "nlevel >= IPL_NONE" failed: file "/syzkaller/managers/setuid/kernel/sys/arch/amd64/amd64/intr.c", line 699 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 229516 92843 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(fe68934a) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f3421b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f3421b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021268020,fffffd806f3421b0,fffffd806f342238,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021268020,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021268020) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021268020,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021268020,ffff80002b1d92c0,ffff80002b1d9310) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002b1d9390) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002b1d9390) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bc3f4bd2b10, count: 2 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: kernel diagnostic assertion "nlevel >= IPL_NONE" failed: file "/syzkaller/managers/setuid/kernel/sys/arch/amd64/amd64/intr.c", line 699 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(fe68934a) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f3421b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f3421b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021268020,fffffd806f3421b0,fffffd806f342238,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021268020,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021268020) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021268020,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021268020,ffff80002b1d92c0,ffff80002b1d9310) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002b1d9390) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002b1d9390) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bc3f4bd2b10, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002b1d8f00 rbx 0xffff800020d59b9f rdx 0 rcx 0xffff800021268020 rax 0xffff800020d58ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xfce89ebd55c3436d r11 0x9c42ad329f399d45 r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff814c2d0c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002b1d8ef0 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.6) pid=406814 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff800027b73d40,0xffff800021269d68 process=0xffff8000ffff9d58 user=0xffff80002b1d4000, vmspace=0xfffffd8075aa7b00 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 83854 257439 90824 32767 2 0x10 syz-executor.4 83854 335279 90824 32767 3 0x4000090 fsleep syz-executor.4 40650 236643 9330 32767 2 0x10 syz-executor.5 96588 517336 40264 32767 2 0x10 syz-executor.3 96588 189407 40264 32767 3 0x4000090 fsleep syz-executor.3 96588 215186 40264 32767 2 0x4000010 syz-executor.3 25202 301391 65992 32767 2 0x10 syz-executor.2 25202 34138 65992 32767 3 0x4000090 fsleep syz-executor.2 55601 139716 16133 32767 3 0x90 nanoslp syz-executor.0 16133 484830 27249 0 3 0x82 wait syz-executor.0 90824 111749 53605 32767 3 0x90 nanoslp syz-executor.4 53605 243266 27249 0 3 0x82 wait syz-executor.4 40264 421042 20353 32767 3 0x90 nanoslp syz-executor.3 20353 223366 27249 0 3 0x82 wait syz-executor.3 54333 89021 12784 32767 3 0x10 biowait syz-executor.1 12784 275069 27249 0 3 0x82 wait syz-executor.1 39921 34505 11177 32767 3 0x90 nanoslp syz-executor.6 11177 166764 27249 0 3 0x82 wait syz-executor.6 75593 277339 54971 32767 3 0x90 nanoslp syz-executor.7 54971 497965 27249 0 3 0x82 wait syz-executor.7 9330 171142 53180 32767 3 0x90 nanoslp syz-executor.5 53180 246618 27249 0 3 0x82 wait syz-executor.5 7468 31730 0 0 3 0x14200 bored sosplice 65992 431912 63824 32767 3 0x90 nanoslp syz-executor.2 63824 150688 27249 0 3 0x82 wait syz-executor.2 27249 75091 5746 0 3 0x2000082 wait syz-fuzzer 27249 246907 5746 0 3 0x6000082 nanoslp syz-fuzzer 27249 5247 5746 0 3 0x6000082 thrsleep syz-fuzzer 27249 92441 5746 0 3 0x6000082 thrsleep syz-fuzzer 27249 205239 5746 0 3 0x6000082 thrsleep syz-fuzzer 27249 388593 5746 0 3 0x6000082 thrsleep syz-fuzzer 27249 175139 5746 0 3 0x6000082 wait syz-fuzzer 27249 227623 5746 0 3 0x6000082 wait syz-fuzzer 27249 328404 5746 0 3 0x6000082 wait syz-fuzzer 27249 276230 5746 0 3 0x6000082 thrsleep syz-fuzzer 27249 95767 5746 0 3 0x6000082 thrsleep syz-fuzzer 27249 227293 5746 0 3 0x6000082 wait syz-fuzzer 27249 436222 5746 0 3 0x6000082 wait syz-fuzzer 27249 9355 5746 0 3 0x6000082 wait syz-fuzzer 27249 157122 5746 0 3 0x6000082 wait syz-fuzzer 27249 519836 5746 0 3 0x6000082 kqread syz-fuzzer 5746 517197 6400 0 3 0x10008a sigsusp ksh 6400 521194 47834 0 3 0x9a kqread sshd 13055 419686 1 0 3 0x100083 ttyin getty 47834 512544 1 0 3 0x88 kqread sshd 34423 361381 62727 73 3 0x1100090 kqread syslogd 62727 320699 1 0 3 0x100082 netio syslogd 75363 203586 1 0 3 0x100080 kqread resolvd 13072 19258 74555 77 3 0x100092 kqread dhcpleased 44490 94274 74555 77 3 0x100092 kqread dhcpleased 74555 145969 1 0 3 0x80 kqread dhcpleased 44265 177236 0 0 3 0x14200 bored smr 80041 440641 0 0 2 0x14200 zerothread 21060 292306 0 0 3 0x14200 aiodoned aiodoned 75761 392157 0 0 3 0x14200 syncer update 33674 277503 0 0 3 0x14200 cleaner cleaner 92843 229516 0 0 7 0x14200 reaper 2308 518276 0 0 3 0x14200 pgdaemon pagedaemon 30383 137051 0 0 3 0x14200 bored viomb 74878 210841 0 0 3 0x40014200 acpi0 acpi0 88137 167581 0 0 3 0x40014200 idle1 23537 166166 0 0 3 0x14200 bored softnet3 17617 420730 0 0 3 0x14200 bored softnet2 62982 87949 0 0 3 0x14200 bored softnet1 430 98409 0 0 3 0x14200 bored softnet0 71056 341961 0 0 3 0x14200 bored systqmp 59276 284084 0 0 3 0x14200 bored systq 91494 308413 0 0 3 0x40014200 bored softclock 44155 375222 0 0 3 0x40014200 idle0 1 284338 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff82c952b8) #0 witness_lock+0x447 #1 wakeup_n+0x37 sys/kern/kern_synch.c:541 #2 sched_idle+0x232 sys/kern/kern_sched.c:176 #3 proc_trampoline+0x1c Process 54333 (syz-executor.1) thread 0xffff800024720d48 (89021) exclusive rrwlock inode r = 0 (0xfffffd8075b8c1b0) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 #11 namei+0x55a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80678eae68) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10218 6413K 6420K 78643K 11385 0 pcb 13 16K 20K 78643K 19 0 rtable 244 6K 7K 78643K 1355 0 pf 29 8K 8K 78643K 87 0 ifaddr 44 15K 15K 78643K 166 0 ifgroup 50 2K 2K 78643K 166 0 sysctl 2 0K 1K 78643K 6 0 counters 60 35K 35K 78643K 118 0 ioctlops 0 0K 2K 78643K 147 0 iov 0 0K 16K 78643K 753 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 2818 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 3 5K 9K 78643K 103 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 143 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 23 85K 125K 78643K 6881 0 sigio 0 0K 0K 78643K 585 0 proc 56 78K 115K 78643K 1688 0 subproc 104 6K 6K 78643K 481 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 2 0K 0K 78643K 2711 0 in_multi 99 7K 7K 78643K 483 0 ether_multi 1 0K 0K 78643K 9 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 247 1102K 1102K 78643K 247 0 exec 0 0K 1K 78643K 1379 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 402 91K 104K 78643K 68783 0 UVM aobj 131 4K 4K 78643K 133 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 167 0 NDP 11 0K 2K 78643K 114 0 temp 74 5920K 6000K 78643K 21913 0 kqueue 12 18K 26K 78643K 495 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 267 0 264 3 2 1 3 0 8 0 rtentry 112 442 0 327 4 0 4 4 0 8 0 unpcb 144 4775 0 4762 52 51 1 6 0 8 0 syncache 304 76 0 76 13 13 0 1 0 8 0 tcpqe 32 448 0 448 10 10 0 1 0 8 0 tcpcb 808 9619 0 9612 167 159 8 24 0 8 7 arp 120 76 0 58 1 0 1 1 0 8 0 ipq 40 9 0 8 5 4 1 1 0 8 0 ipqe 40 159 0 158 5 4 1 1 0 8 0 inpcb 368 17477 0 17466 270 262 8 23 0 8 6 nd6 136 123 0 94 3 1 2 2 0 8 0 kcovpl 48 37 0 29 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1775 0 1307 31 1 30 30 0 8 0 art_table 32 1776 0 1307 4 0 4 4 0 8 0 art_node 16 441 0 336 1 0 1 1 0 8 0 semupl 112 6 0 6 2 2 0 1 0 8 0 semapl 112 136 0 126 1 0 1 1 0 8 0 shmpl 112 130 0 2 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 9901 0 8444 92 0 92 92 0 8 0 ffsino 272 9901 0 8444 98 0 98 98 0 8 0 nchpl 144 18674 0 17031 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 61507 0 61507 9 8 1 2 0 8 1 percpumem 16 72 0 29 1 0 1 1 0 8 0 kstatmem 264 80 0 58 2 0 2 2 0 8 0 scxspl 216 57737 0 57736 29 26 3 8 1 8 2 plimitpl 152 1053 0 1030 14 12 2 2 0 8 1 sigapl 424 7117 0 7063 7 0 7 7 0 8 0 futexpl 64 59204 0 59201 4 3 1 1 0 8 0 knotepl 120 431 0 0 10 1 9 10 0 8 0 kqueuepl 216 1054 0 1046 16 15 1 5 0 8 0 pipepl 320 1702 0 1674 44 41 3 11 0 8 0 fdescpl 496 7099 0 7065 7 2 5 6 0 8 0 filepl 152 51815 0 51576 109 97 12 19 0 8 2 lockfpl 104 1236 0 1234 2 1 1 2 0 8 0 lockfspl 48 470 0 468 1 0 1 1 0 8 0 sessionpl 144 52 0 36 1 0 1 1 0 8 0 pgrppl 48 73 0 57 1 0 1 1 0 8 0 ucredpl 104 6789 0 6771 1 0 1 1 0 8 0 zombiepl 144 7066 0 7063 1 0 1 1 0 8 0 processpl 1072 7117 0 7063 5 1 4 5 0 8 0 procpl 680 19116 0 19043 19 11 8 8 0 8 1 sosppl 168 74 0 73 8 7 1 1 0 8 0 sockpl 488 22975 0 22948 536 524 12 34 0 8 8 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 26 0 0 4 1 3 3 0 8 0 mcl4k 4096 41 0 0 4 1 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 294 0 0 31 6 25 31 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 1224 0 0 64 0 64 64 0 8 0 bufpl 288 14811 0 8485 453 0 453 453 0 8 0 anonpl 24 807474 0 796282 192 95 97 115 0 186 12 amapchunkpl 152 228579 0 227761 92 48 44 51 0 158 8 amappl16 200 18157 0 17840 121 94 27 40 0 8 8 amappl15 192 12 0 12 2 2 0 1 0 8 0 amappl14 184 234 0 222 2 1 1 2 0 8 0 amappl13 176 28 0 26 1 0 1 1 0 8 0 amappl12 168 8170 0 8132 3 0 3 3 0 8 0 amappl11 160 50 0 40 1 0 1 1 0 8 0 amappl10 152 74 0 63 1 0 1 1 0 8 0 amappl9 144 223 0 222 2 1 1 1 0 8 0 amappl8 136 583 0 443 5 0 5 5 0 8 0 amappl7 128 91 0 75 2 1 1 2 0 8 0 amappl6 120 496 0 466 1 0 1 1 0 8 0 amappl5 112 386 0 378 1 0 1 1 0 8 0 amappl4 104 837 0 794 2 0 2 2 0 8 0 amappl3 96 42751 0 42666 4 1 3 4 0 8 0 amappl2 88 7705 0 7633 3 1 2 3 0 8 0 amappl1 80 35136 0 34606 22 10 12 22 0 8 0 amappl 88 67817 0 67581 8 1 7 7 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 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 72 132 0 2 3 0 3 3 0 8 0 uaddrrnd 24 7099 0 7065 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7099 0 7065 1 0 1 1 0 8 0 vmmpekpl 168 60073 0 60005 4 0 4 4 0 8 0 vmmpepl 168 439608 0 437192 214 91 123 131 0 357 7 vmsppl 464 7098 0 7065 7 2 5 6 0 8 0 rwobjpl 56 117972 0 110519 120 10 110 110 0 8 1 pdppl 4096 14206 0 14130 438 356 82 96 0 8 6 pvpl 32 2189725 0 2172468 456 278 178 340 0 265 23 pmappl 248 7098 0 7065 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1693 0 807 27 0 27 27 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c1fff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82c97058) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c97058) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000211b9340,ffff80000007b080) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 kd_curproc sys/dev/kcov.c:590 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 sys/dev/kcov.c:158 witness_checkorder(ffffffff82bbbea0,9,0) at witness_checkorder+0x38 sys/kern/subr_witness.c:770 mtx_enter(ffffffff82bbbe90) at mtx_enter+0x3e sys/kern/kern_lock.c:265 msleep(ffffffff82cab180,ffffffff82bbbe90,4,ffffffff8285b851,0) at msleep+0x1f1 sys/kern/kern_synch.c:239 reaper(ffff8000211b37f0) at reaper+0xdb sys/kern/kern_exit.c:437 end trace frame: 0x0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff82c1fff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82c97058) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c97058) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000211b9340,ffff80000007b080) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 kd_curproc sys/dev/kcov.c:590 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 sys/dev/kcov.c:158 witness_checkorder(ffffffff82bbbea0,9,0) at witness_checkorder+0x38 sys/kern/subr_witness.c:770 mtx_enter(ffffffff82bbbe90) at mtx_enter+0x3e sys/kern/kern_lock.c:265 msleep(ffffffff82cab180,ffffffff82bbbe90,4,ffffffff8285b851,0) at msleep+0x1f1 sys/kern/kern_synch.c:239 reaper(ffff8000211b37f0) at reaper+0xdb sys/kern/kern_exit.c:437 end trace frame: 0x0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(fe68934a) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f3421b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f3421b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021268020,fffffd806f3421b0,fffffd806f342238,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021268020,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021268020) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021268020,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021268020,ffff80002b1d92c0,ffff80002b1d9310) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002b1d9390) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002b1d9390) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bc3f4bd2b10, count: 2 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(fe68934a) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f3421b0) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f3421b0) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff800021268020,fffffd806f3421b0,fffffd806f342238,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021268020,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021268020) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021268020,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021268020,ffff80002b1d92c0,ffff80002b1d9310) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002b1d9390) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002b1d9390) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bc3f4bd2b10, count: -13