uvm_fault(0xfffffd8069b7d020, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND 198375 65651 0 0x14000 0x200 0 softnet0 witness_checkorder(fffffd806f16d5f8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f16d5e8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800022d0ba98,fffffd806f16d5e8,fffffd806f16d670,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800022d0ba98,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800022d0ba98) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800022d0ba98,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800022d0ba98,ffff8000247293b0,ffff800024729400) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800024729480) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800024729480) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fea3e1ecf60, count: 6 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: uvm_fault(0xfffffd8069b7d020, 0x8, 0, 1) -> e ddb{1}> trace witness_checkorder(fffffd806f16d5f8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f16d5e8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800022d0ba98,fffffd806f16d5e8,fffffd806f16d670,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800022d0ba98,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800022d0ba98) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800022d0ba98,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800022d0ba98,ffff8000247293b0,ffff800024729400) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800024729480) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800024729480) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fea3e1ecf60, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff800024729150 rbx 0xe rdx 0 rcx 0xffff800022d0ba98 rax 0xffff800020d58ff0 r8 0x1 r9 0x1 r10 0x6fe528e2dff548a8 r11 0x1ceba2254786f164 r12 0 r13 0xfffffd806f16d5f8 r14 0 r15 0xffff800022d0ba98 rip 0xffffffff81a26f5c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000247290a0 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor.6) pid=242448 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000211ee808,0xffff800021289570 process=0xffff800027ba0878 user=0xffff800024724000, vmspace=0xfffffd8069b7d020 estcpu=31, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 30021 507232 20559 32767 2 0x10 syz-executor.1 30021 404010 20559 32767 3 0x4000090 fsleep syz-executor.1 74337 184043 23100 32767 3 0x90 nanoslp syz-executor.3 74337 241898 23100 32767 3 0x4000090 fsleep syz-executor.3 74337 349690 23100 32767 3 0x4000090 pipewr syz-executor.3 8305 310604 43365 32767 3 0x90 nanoslp syz-executor.6 43365 71768 60663 0 3 0x82 wait syz-executor.6 75688 120386 18664 32767 3 0x90 nanoslp syz-executor.2 18664 3764 60663 0 3 0x82 wait syz-executor.2 52138 430858 34300 32767 2 0x10 syz-executor.5 34300 249218 60663 0 3 0x82 wait syz-executor.5 99115 212997 62183 32767 3 0x10 biowait syz-executor.0 62183 75829 60663 0 3 0x82 wait syz-executor.0 34402 480417 0 0 3 0x14200 bored sosplice 68658 67138 30034 32767 3 0x10 getblk syz-executor.7 27796 222405 80667 32767 2 0x10 syz-executor.4 30034 123717 60663 0 3 0x82 wait syz-executor.7 23100 39540 87979 32767 3 0x90 nanoslp syz-executor.3 80667 292852 60663 0 3 0x82 wait syz-executor.4 20559 266747 22827 32767 3 0x90 nanoslp syz-executor.1 87979 117455 60663 0 3 0x82 wait syz-executor.3 22827 492170 60663 0 3 0x82 wait syz-executor.1 60663 377777 37149 0 3 0x2000082 thrsleep syz-fuzzer 60663 437291 37149 0 3 0x6000082 nanoslp syz-fuzzer 60663 497299 37149 0 3 0x6000082 wait syz-fuzzer 60663 510239 37149 0 3 0x6000082 wait syz-fuzzer 60663 243690 37149 0 3 0x6000082 thrsleep syz-fuzzer 60663 67993 37149 0 3 0x6000082 wait syz-fuzzer 60663 319017 37149 0 3 0x6000082 wait syz-fuzzer 60663 366556 37149 0 2 0x6000002 syz-fuzzer 60663 300022 37149 0 3 0x6000082 wait syz-fuzzer 60663 285085 37149 0 3 0x6000082 wait syz-fuzzer 60663 427497 37149 0 3 0x6000082 thrsleep syz-fuzzer 60663 475037 37149 0 3 0x6000082 wait syz-fuzzer 60663 114809 37149 0 3 0x6000082 thrsleep syz-fuzzer 60663 89438 37149 0 3 0x6000082 wait syz-fuzzer 60663 515255 37149 0 3 0x6000082 thrsleep syz-fuzzer 37149 312783 47579 0 3 0x10008a sigsusp ksh 47579 430614 51268 0 3 0x9a kqread sshd 20115 351655 1 0 3 0x100083 ttyin getty 51268 421320 1 0 3 0x88 kqread sshd 42724 430078 47771 73 3 0x1100090 kqread syslogd 47771 50384 1 0 3 0x100082 netio syslogd 88514 251796 1 0 3 0x100080 kqread resolvd 10072 418827 37640 77 3 0x100092 kqread dhcpleased 47534 389586 37640 77 3 0x100092 kqread dhcpleased 37640 458219 1 0 3 0x80 kqread dhcpleased 94062 428862 0 0 3 0x14200 bored smr 82646 91143 0 0 2 0x14200 zerothread 21177 163379 0 0 3 0x14200 aiodoned aiodoned 56043 260500 0 0 3 0x14200 syncer update 35029 205464 0 0 3 0x14200 cleaner cleaner 81384 214686 0 0 2 0x14200 reaper 80165 370207 0 0 3 0x14200 pgdaemon pagedaemon 23579 406178 0 0 3 0x14200 bored viomb 89083 276234 0 0 3 0x40014200 acpi0 acpi0 33381 458468 0 0 3 0x40014200 idle1 59929 208961 0 0 3 0x14200 bored softnet3 79619 121391 0 0 3 0x14200 bored softnet2 20617 369298 0 0 3 0x14200 bored softnet1 65651 198375 0 0 7 0x14200 softnet0 28379 346799 0 0 3 0x14200 bored systqmp 41501 217349 0 0 3 0x14200 bored systq 97342 439207 0 0 3 0x40014200 bored softclock 52608 122443 0 0 3 0x40014200 idle0 1 348577 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 99115 (syz-executor.0) thread 0xffff800021286550 (212997) exclusive rrwlock inode r = 0 (0xfffffd806e6a4818) #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 ufs_ihashins+0x46 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1343 #6 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073 #10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80687f93c8) #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 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058 #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 Process 68658 (syz-executor.7) thread 0xffff800021286000 (67138) exclusive rrwlock inode r = 0 (0xfffffd806e6a84e0) #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 (0xfffffd8066508c58) #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 Process 65651 (softnet0) thread 0xffff800021168000 (198375) exclusive rwlock netlock r = 0 (0xffffffff82b8e5f0) #0 witness_lock+0x447 #1 if_netisr+0x1f sys/net/if.c:1046 #2 taskq_thread+0xe5 sys/kern/kern_task.c:450 #3 proc_trampoline+0x1c shared rwlock softnet0 r = 0 (0xffff80000002d070) #0 witness_lock+0x447 #1 taskq_thread+0xca sys/kern/kern_task.c:446 #2 proc_trampoline+0x1c ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10189 6409K 6420K 78643K 11297 0 pcb 13 8K 8K 78643K 13 0 rtable 236 6K 6K 78643K 693 0 pf 29 8K 8K 78643K 49 0 ifaddr 44 15K 15K 78643K 88 0 ifgroup 50 2K 2K 78643K 90 0 sysctl 1 1K 1K 78643K 1 0 counters 60 35K 35K 78643K 80 0 ioctlops 0 0K 2K 78643K 46 0 iov 0 0K 28K 78643K 87 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1278 80K 80K 78643K 1487 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 13K 78643K 35 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 107 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 21 77K 125K 78643K 2822 0 sigio 0 0K 0K 78643K 8 0 proc 56 78K 115K 78643K 865 0 subproc 104 6K 6K 78643K 234 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 1 0K 0K 78643K 261 0 in_multi 101 7K 7K 78643K 363 0 ether_multi 1 0K 0K 78643K 12 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 73 334K 334K 78643K 73 0 exec 0 0K 1K 78643K 675 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 307 81K 91K 78643K 26112 0 UVM aobj 60 2K 2K 78643K 82 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 189 0 NDP 11 0K 2K 78643K 57 0 temp 73 5916K 5991K 78643K 10762 0 kqueue 12 18K 70K 78643K 519 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 120 129 0 126 1 0 1 1 0 8 0 rtentry 112 223 0 112 4 0 4 4 0 8 0 unpcb 144 650 0 637 2 1 1 2 0 8 0 syncache 304 102 0 102 2 1 1 1 0 8 1 tcpqe 32 194 0 194 5 4 1 1 0 8 1 tcpcb 808 864 0 804 8 1 7 7 0 8 1 arp 120 39 0 20 1 0 1 1 0 8 0 ipq 40 11 0 10 2 1 1 1 0 8 0 ipqe 40 41 0 40 2 1 1 1 0 8 0 inpcb 368 1632 0 1563 9 1 8 8 0 8 1 nd6 136 55 0 31 1 0 1 1 0 8 0 kcovpl 48 18 0 10 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 917 0 460 29 0 29 29 0 8 0 art_table 32 918 0 460 4 0 4 4 0 8 0 art_node 16 222 0 121 1 0 1 1 0 8 0 sysvmsgpl 40 59 0 59 2 2 0 1 0 8 0 semapl 112 95 0 85 1 0 1 1 0 8 0 shmpl 112 79 0 22 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4470 0 3033 91 0 91 91 0 8 0 ffsino 272 4470 0 3033 97 0 97 97 0 8 0 nchpl 144 7798 0 6159 63 0 63 63 0 8 0 uvmvnodes 80 4713 0 0 97 0 97 97 0 8 0 vnodes 216 4713 0 0 262 0 262 262 0 8 0 namei 1024 21729 0 21728 2 1 1 2 0 8 0 percpumem 16 53 0 10 1 0 1 1 0 8 0 kstatmem 264 42 0 20 2 0 2 2 0 8 0 scxspl 216 24663 0 24662 12 11 1 8 1 8 0 plimitpl 152 209 0 186 4 3 1 2 0 8 0 sigapl 424 3101 0 3050 7 0 7 7 0 8 0 futexpl 64 15373 0 15371 1 0 1 1 0 8 0 knotepl 120 583 0 0 17 0 17 17 0 8 0 kqueuepl 216 413 0 405 2 1 1 2 0 8 0 pipepl 320 276 0 247 3 0 3 3 0 8 0 fdescpl 496 3083 0 3051 7 2 5 6 0 8 0 filepl 152 9431 0 9193 11 1 10 11 0 8 0 lockfpl 104 318 0 316 1 0 1 1 0 8 0 lockfspl 48 119 0 117 1 0 1 1 0 8 0 sessionpl 144 33 0 17 1 0 1 1 0 8 0 pgrppl 48 48 0 32 1 0 1 1 0 8 0 ucredpl 104 1602 0 1584 1 0 1 1 0 8 0 zombiepl 144 3052 0 3050 1 0 1 1 0 8 0 processpl 1072 3101 0 3050 5 1 4 5 0 8 0 procpl 680 6049 0 5980 8 0 8 8 0 8 1 sosppl 168 68 0 59 1 0 1 1 0 8 0 sockpl 488 2415 0 2339 12 1 11 11 0 8 0 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl16k 16384 12 0 0 2 0 2 2 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 1 mcl4k 4096 19 0 0 3 0 3 3 0 8 1 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 284 0 0 36 0 36 36 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1765 0 0 110 0 110 110 0 8 0 bufpl 288 8016 0 1689 453 0 453 453 0 8 0 anonpl 24 400189 0 393010 61 15 46 55 0 186 0 amapchunkpl 152 82521 0 81784 38 3 35 35 0 158 2 amappl16 200 8984 0 8863 13 5 8 9 0 8 1 amappl15 192 15 0 13 1 0 1 1 0 8 0 amappl14 184 213 0 196 2 0 2 2 0 8 0 amappl13 176 15 0 14 1 0 1 1 0 8 0 amappl12 168 3890 0 3855 3 0 3 3 0 8 0 amappl11 160 52 0 42 1 0 1 1 0 8 0 amappl10 152 61 0 45 1 0 1 1 0 8 0 amappl9 144 256 0 254 1 0 1 1 0 8 0 amappl8 136 277 0 217 3 0 3 3 0 8 0 amappl7 128 61 0 46 2 0 2 2 0 8 0 amappl6 120 300 0 283 2 1 1 2 0 8 0 amappl5 112 258 0 248 1 0 1 1 0 8 0 amappl4 104 622 0 583 2 0 2 2 0 8 0 amappl3 96 16592 0 16511 3 0 3 3 0 8 0 amappl2 88 3343 0 3273 3 1 2 3 0 8 0 amappl1 80 19403 0 18883 22 9 13 22 0 8 0 amappl 88 25473 0 25255 7 0 7 7 0 92 1 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 81 0 22 2 0 2 2 0 8 0 uaddrrnd 24 3083 0 3051 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3083 0 3051 1 0 1 1 0 8 0 vmmpekpl 168 23003 0 22943 3 0 3 3 0 8 0 vmmpepl 168 190437 0 188411 115 15 100 112 0 357 1 vmsppl 464 3082 0 3051 7 2 5 6 0 8 0 rwobjpl 56 53167 0 47288 87 3 84 84 0 8 0 pdppl 4096 6174 0 6102 172 90 82 96 0 8 10 pvpl 32 1233302 0 1220203 347 64 283 346 0 265 167 pmappl 248 3082 0 3051 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1032 0 95 27 0 27 27 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82bbdff0) 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 __sanitizer_cov_trace_const_cmp4(0,0) at __sanitizer_cov_trace_const_cmp4+0x1c kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_const_cmp4(0,0) at __sanitizer_cov_trace_const_cmp4+0x1c sys/dev/kcov.c:235 mtx_leave(ffff80000002d018) at mtx_leave+0x40 sys/kern/kern_lock.c:357 msleep(ffff80000002d000,ffff80000002d018,20,ffffffff827d5cb7,0) at msleep+0x131 sys/kern/kern_synch.c:232 taskq_next_work(ffff80000002d000,ffff800021187940) at taskq_next_work+0x6e sys/kern/kern_task.c:403 taskq_thread(ffff80000002d000) at taskq_thread+0x135 sys/kern/kern_task.c:443 end trace frame: 0x0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff82bbdff0) 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 __sanitizer_cov_trace_const_cmp4(0,0) at __sanitizer_cov_trace_const_cmp4+0x1c kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_const_cmp4(0,0) at __sanitizer_cov_trace_const_cmp4+0x1c sys/dev/kcov.c:235 mtx_leave(ffff80000002d018) at mtx_leave+0x40 sys/kern/kern_lock.c:357 msleep(ffff80000002d000,ffff80000002d018,20,ffffffff827d5cb7,0) at msleep+0x131 sys/kern/kern_synch.c:232 taskq_next_work(ffff80000002d000,ffff800021187940) at taskq_next_work+0x6e sys/kern/kern_task.c:403 taskq_thread(ffff80000002d000) at taskq_thread+0x135 sys/kern/kern_task.c:443 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx witness_checkorder(fffffd806f16d5f8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f16d5e8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800022d0ba98,fffffd806f16d5e8,fffffd806f16d670,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800022d0ba98,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800022d0ba98) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800022d0ba98,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800022d0ba98,ffff8000247293b0,ffff800024729400) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800024729480) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800024729480) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fea3e1ecf60, count: 6 ddb{1}> trace witness_checkorder(fffffd806f16d5f8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f16d5e8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800022d0ba98,fffffd806f16d5e8,fffffd806f16d670,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800022d0ba98,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800022d0ba98) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800022d0ba98,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800022d0ba98,ffff8000247293b0,ffff800024729400) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800024729480) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800024729480) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fea3e1ecf60, count: -9