login: uvm_fault(0xfffffd8069946588, 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 256535 52206 0 0 0 0 syz-executor.2 witness_checkorder(fffffd8074ce7d90,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd8074ce7d80) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000211b22b0,fffffd8074ce7d80,fffffd8074ce7e08,5,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211b22b0,5) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211b22b0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211b22b0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211b22b0,ffff80002e4b9260,ffff80002e4b92b0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e4b9330) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e4b9330) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75ec5fa2ba70, 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(0xfffffd8069946588, 0x8, 0, 1) -> e ddb{1}> trace witness_checkorder(fffffd8074ce7d90,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd8074ce7d80) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000211b22b0,fffffd8074ce7d80,fffffd8074ce7e08,5,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211b22b0,5) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211b22b0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211b22b0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211b22b0,ffff80002e4b9260,ffff80002e4b92b0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e4b9330) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e4b9330) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75ec5fa2ba70, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff80002e4b9000 rbx 0xe rdx 0 rcx 0xffff8000211b22b0 rax 0xffff800020d58ff0 r8 0 r9 0x1 r10 0 r11 0x63425998fedeecb8 r12 0 r13 0xfffffd8074ce7d90 r14 0 r15 0xffff8000211b22b0 rip 0xffffffff8138576c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002e4b8f50 ss 0 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor.0) pid=201109 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff800026132020,0xffff80002128dd58 process=0xffff80002127d508 user=0xffff80002e4b4000, vmspace=0xfffffd8069946588 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 52206 256535 74020 0 7 0 syz-executor.2 52220 166504 79311 0 2 0 syz-executor.5 52220 4961 79311 0 3 0x4000080 fsleep syz-executor.5 69497 313574 10912 0 2 0 syz-executor.3 90321 116968 26746 0 2 0 syz-executor.1 90321 465301 26746 0 3 0x4000080 fsleep syz-executor.1 90321 515595 26746 0 3 0x4000080 fsleep syz-executor.1 74026 519489 64658 0 2 0 syz-executor.7 74026 220266 64658 0 3 0x4000080 bell syz-executor.7 74026 438350 64658 0 3 0x4000080 rest syz-executor.7 42934 65972 34241 0 2 0 syz-executor.4 42934 382161 34241 0 3 0x4000080 fsleep syz-executor.4 42934 389257 34241 0 2 0x4000000 syz-executor.4 39388 404989 99133 0 2 0 syz-executor.6 39388 318622 99133 0 3 0x4000080 netio syz-executor.6 39388 320442 99133 0 3 0x4000080 netio syz-executor.6 39388 158038 99133 0 2 0x4000000 syz-executor.6 86869 361489 1 0 3 0x100083 ttyin getty 84367 428760 0 0 3 0x14200 acct acct 95930 508997 35957 0 3 0x82 nanoslp syz-executor.0 26746 18084 35957 0 3 0x82 nanoslp syz-executor.1 34241 68779 35957 0 3 0x82 nanoslp syz-executor.4 64658 225027 35957 0 3 0x82 nanoslp syz-executor.7 99133 173691 35957 0 3 0x82 nanoslp syz-executor.6 79311 342395 35957 0 3 0x82 nanoslp syz-executor.5 10912 19271 35957 0 2 0x2 syz-executor.3 64069 346177 0 0 3 0x14200 bored sosplice 78415 82184 0 0 3 0x14280 nfsidl nfsio 57615 152911 0 0 3 0x14280 nfsidl nfsio 23810 484023 0 0 3 0x14280 nfsidl nfsio 22127 108528 0 0 3 0x14280 nfsidl nfsio 22346 95071 0 0 3 0x14280 nfsidl nfsio 86325 435399 0 0 3 0x14280 nfsidl nfsio 7426 445174 0 0 3 0x14280 nfsidl nfsio 22694 515426 0 0 3 0x14280 nfsidl nfsio 62647 295969 0 0 3 0x14280 nfsidl nfsio 88401 238941 0 0 3 0x14280 nfsidl nfsio 4754 521873 0 0 3 0x14280 nfsidl nfsio 55239 297457 0 0 3 0x14280 nfsidl nfsio 29088 341858 0 0 3 0x14280 nfsidl nfsio 4225 174120 0 0 3 0x14280 nfsidl nfsio 70255 213150 0 0 3 0x14280 nfsidl nfsio 26912 144653 0 0 3 0x14280 nfsidl nfsio 11983 440596 0 0 3 0x14280 nfsidl nfsio 64259 82258 0 0 3 0x14280 nfsidl nfsio 89587 293918 0 0 3 0x14280 nfsidl nfsio 98402 515931 0 0 3 0x14280 nfsidl nfsio 74020 328341 35957 0 3 0x82 nanoslp syz-executor.2 35957 393572 93544 0 3 0x2000082 thrsleep syz-fuzzer 35957 282015 93544 0 3 0x6000082 thrsleep syz-fuzzer 35957 471809 93544 0 3 0x6000082 thrsleep syz-fuzzer 35957 340583 93544 0 3 0x6000082 wait syz-fuzzer 35957 502145 93544 0 3 0x6000082 wait syz-fuzzer 35957 160139 93544 0 3 0x6000082 thrsleep syz-fuzzer 35957 277781 93544 0 3 0x6000082 thrsleep syz-fuzzer 35957 138209 93544 0 3 0x6000082 wait syz-fuzzer 35957 380115 93544 0 3 0x6000082 wait syz-fuzzer 35957 177370 93544 0 3 0x6000082 wait syz-fuzzer 35957 228173 93544 0 3 0x6000082 thrsleep syz-fuzzer 35957 378375 93544 0 3 0x6000082 thrsleep syz-fuzzer 35957 3768 93544 0 3 0x6000082 wait syz-fuzzer 35957 372700 93544 0 3 0x6000082 wait syz-fuzzer 35957 422760 93544 0 3 0x6000082 wait syz-fuzzer 35957 352905 93544 0 3 0x6000082 kqread syz-fuzzer 93544 319455 12054 0 3 0x10008a sigsusp ksh 12054 200695 54755 0 3 0x9a kqread sshd 54755 244711 1 0 3 0x88 kqread sshd 18605 211662 76946 74 3 0x1100092 bpf pflogd 76946 412939 1 0 3 0x80 netio pflogd 41577 104961 51178 73 3 0x1100090 kqread syslogd 51178 113247 1 0 3 0x100082 netio syslogd 83459 477588 1 0 3 0x100080 kqread resolvd 86749 52498 27583 77 3 0x100092 kqread dhcpleased 44544 396625 27583 77 3 0x100092 kqread dhcpleased 27583 281703 1 0 3 0x80 kqread dhcpleased 12026 286905 0 0 3 0x14200 bored smr 19465 246995 0 0 2 0x14200 zerothread 78209 362490 0 0 3 0x14200 aiodoned aiodoned 8295 357513 0 0 3 0x14200 syncer update 94021 22432 0 0 3 0x14200 cleaner cleaner 68189 414551 0 0 2 0x14200 reaper 30951 436321 0 0 3 0x14200 pgdaemon pagedaemon 38566 486600 0 0 3 0x14200 bored viomb 19679 355507 0 0 3 0x40014200 acpi0 acpi0 5118 377970 0 0 3 0x40014200 idle1 64153 61303 0 0 3 0x14200 bored softnet3 72857 522289 0 0 3 0x14200 bored softnet2 78454 50535 0 0 3 0x14200 bored softnet1 42460 183028 0 0 3 0x14200 bored softnet0 11989 233160 0 0 3 0x14200 bored systqmp 21013 443957 0 0 3 0x14200 bored systq 86216 382103 0 0 3 0x40014200 bored softclock 49738 462499 0 0 3 0x40014200 idle0 1 239536 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 (0xffffffff82d64410) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10224 6486K 7002K 78643K 19045 0 pcb 13 18K 22K 78643K 1106 0 rtable 243 7K 7K 78643K 993 0 pf 32 9K 10K 78643K 190 0 ifaddr 45 16K 17K 78643K 157 0 ifgroup 55 2K 2K 78643K 286 0 sysctl 2 0K 2K 78643K 5 0 counters 60 35K 36K 78643K 184 0 ioctlops 0 0K 4K 78643K 1712 0 iov 2 24K 40K 78643K 1593 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1384 87K 87K 78643K 4645 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 90 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 1520 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 18 65K 89K 78643K 7881 0 sigio 0 0K 0K 78643K 258 0 proc 70 91K 115K 78643K 1141 0 subproc 104 6K 7K 78643K 286 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 12994 0 in_multi 99 7K 7K 78643K 329 0 ether_multi 1 0K 0K 78643K 12 0 mrt 1 0K 0K 78643K 6 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 217 970K 970K 78643K 217 0 exec 0 0K 1K 78643K 1324 0 pfkey data 0 0K 0K 78643K 5 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 415 94K 110K 78643K 79455 0 UVM aobj 131 4K 4K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 84 0 NDP 12 0K 1K 78643K 118 0 temp 76 5944K 6064K 78643K 45447 0 kqueue 12 18K 25K 78643K 611 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 120 179 0 176 1 0 1 1 0 8 0 rtentry 112 277 0 164 4 0 4 4 0 8 0 unpcb 144 8566 0 8548 58 52 6 6 0 8 5 syncache 304 22 0 22 6 5 1 1 0 8 1 tcpqe 32 2747 0 2747 7 6 1 1 0 8 1 tcpcb 808 1003 0 990 46 44 2 8 0 8 0 arp 120 48 0 30 1 0 1 1 0 8 0 inpcb 368 15736 0 15718 231 221 10 20 0 8 8 nd6 136 74 0 47 1 0 1 1 0 8 0 pkpcb 40 9 0 9 3 2 1 1 0 8 1 kcovpl 48 22 0 14 1 0 1 1 0 8 0 ppxss 1256 20 0 20 6 5 1 1 0 8 1 pffrag 232 8 0 7 3 2 1 1 0 482 0 pffrnode 88 8 0 7 3 2 1 1 0 8 0 pffrent 40 34 0 33 3 2 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 24 190 0 177 1 0 1 1 0 8 0 pfstkey 128 192 0 179 1 0 1 1 0 8 0 pfstate 376 192 0 179 7 4 3 3 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 1105 0 638 32 2 30 30 0 8 0 art_table 32 1106 0 638 4 0 4 4 0 8 0 art_node 16 274 0 171 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0 semapl 112 1514 0 1504 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 12167 0 10699 92 0 92 92 0 8 0 ffsino 272 12167 0 10699 99 0 99 99 0 8 0 nchpl 144 23993 0 23488 64 41 23 64 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 73190 0 73190 6 5 1 2 0 8 1 percpumem 16 105 0 62 1 0 1 1 0 8 0 vmpool 696 83 0 83 5 5 0 1 0 8 0 kstatmem 264 148 0 124 2 0 2 2 0 8 0 scxspl 216 71555 0 71555 28 25 3 8 1 8 3 plimitpl 152 668 0 652 1 0 1 1 0 8 0 sigapl 424 8194 0 8124 9 1 8 8 0 8 0 futexpl 64 71294 0 71290 4 3 1 1 0 8 0 knotepl 120 528 0 0 11 0 11 11 0 8 0 kqueuepl 216 1114 0 1106 15 14 1 5 0 8 0 pipepl 320 2165 0 2137 66 61 5 9 0 8 2 fdescpl 496 8153 0 8122 6 2 4 5 0 8 0 filepl 152 59535 0 59284 104 89 15 19 0 8 5 lockfpl 104 2458 0 2456 8 7 1 3 0 8 0 lockfspl 48 934 0 932 2 1 1 2 0 8 0 sessionpl 144 39 0 22 1 0 1 1 0 8 0 pgrppl 48 73 0 56 1 0 1 1 0 8 0 ucredpl 104 3845 0 3832 1 0 1 1 0 8 0 zombiepl 144 8125 0 8124 2 1 1 1 0 8 0 processpl 1072 8194 0 8124 5 0 5 5 0 8 0 procpl 680 22118 0 22022 10 1 9 9 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 24 0 24 8 7 1 1 0 8 1 sockpl 488 24590 0 24551 527 514 13 33 0 8 8 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 18 0 0 3 0 3 3 0 8 0 mcl12k 12288 9 0 0 1 0 1 1 0 8 0 mcl9k 9216 16 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 33 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 326 0 0 36 0 36 36 0 8 0 mtagpl 96 479 0 0 9 0 9 9 0 8 0 mbufpl 256 1578 0 0 77 0 77 77 0 8 0 bufpl 288 16567 0 10240 453 0 453 453 0 8 0 anonpl 24 837245 0 823022 187 94 93 160 0 186 0 amapchunkpl 152 250105 0 249167 67 26 41 66 0 158 0 amappl16 200 15590 0 15207 61 40 21 33 0 8 0 amappl15 192 46 0 46 1 1 0 1 0 8 0 amappl14 184 213 0 196 2 1 1 2 0 8 0 amappl13 176 10 0 10 2 2 0 1 0 8 0 amappl12 168 9024 0 8991 4 2 2 3 0 8 0 amappl11 160 49 0 35 1 0 1 1 0 8 0 amappl10 152 63 0 53 1 0 1 1 0 8 0 amappl9 144 299 0 298 1 0 1 1 0 8 0 amappl8 136 483 0 373 4 0 4 4 0 8 0 amappl7 128 126 0 108 2 0 2 2 0 8 0 amappl6 120 376 0 352 2 1 1 2 0 8 0 amappl5 112 373 0 361 1 0 1 1 0 8 0 amappl4 104 783 0 735 3 1 2 3 0 8 0 amappl3 96 49487 0 49395 5 2 3 3 0 8 0 amappl2 88 8618 0 8543 3 1 2 3 0 8 0 amappl1 80 37840 0 37272 23 10 13 23 0 8 0 amappl 88 78657 0 78399 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 8236 0 8205 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8236 0 8205 1 0 1 1 0 8 0 vmmpekpl 168 67093 0 67035 3 0 3 3 0 8 0 vmmpepl 168 490699 0 488229 262 149 113 139 0 357 1 vmsppl 464 8235 0 8205 5 1 4 5 0 8 0 rwobjpl 56 126033 0 118430 115 7 108 111 0 8 0 pdppl 4096 16480 0 16410 480 410 70 82 0 8 0 pvpl 32 2409173 0 2388393 372 201 171 346 0 265 1 pmappl 248 8235 0 8205 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1587 0 690 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82bd4ff0) 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(ffffffff82cdebd8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800027b4f040) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800027b4f040) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72c8a3b852a0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff82bd4ff0) 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(ffffffff82cdebd8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800027b4f040) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800027b4f040) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72c8a3b852a0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx witness_checkorder(fffffd8074ce7d90,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd8074ce7d80) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000211b22b0,fffffd8074ce7d80,fffffd8074ce7e08,5,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211b22b0,5) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211b22b0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211b22b0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211b22b0,ffff80002e4b9260,ffff80002e4b92b0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e4b9330) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e4b9330) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75ec5fa2ba70, count: 6 ddb{1}> trace witness_checkorder(fffffd8074ce7d90,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd8074ce7d80) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000211b22b0,fffffd8074ce7d80,fffffd8074ce7e08,5,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211b22b0,5) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211b22b0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211b22b0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211b22b0,ffff80002e4b9260,ffff80002e4b92b0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e4b9330) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e4b9330) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75ec5fa2ba70, count: -9