uvm_fault(0xfffffd8066993ce0, 0x18ff000008, 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 377776 38274 32767 0x10 0 0 syz-executor.7 witness_checkorder(fffffd806f1ff520,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f1ff510) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021207d50,fffffd806f1ff510,fffffd806f1ff598,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021207d50,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021207d50) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021207d50,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021207d50,ffff8000267692f0,ffff800026769340) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000267693c0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000267693c0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7eff82c99600, 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(0xfffffd8066993ce0, 0x18ff000008, 0, 1) -> e ddb{1}> trace witness_checkorder(fffffd806f1ff520,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f1ff510) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021207d50,fffffd806f1ff510,fffffd806f1ff598,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021207d50,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021207d50) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021207d50,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021207d50,ffff8000267692f0,ffff800026769340) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000267693c0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000267693c0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7eff82c99600, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff800026769090 rbx 0xe rdx 0 rcx 0xffff800021207d50 rax 0xffff800020d58ff0 r8 0x800000 acpi_pdirpa+0x7ebe63 r9 0x1 r10 0 r11 0xdd5105915fd277b r12 0 r13 0xfffffd806f1ff520 r14 0x18ff000000 r15 0xffff800021207d50 rip 0xffffffff81ef9c8c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800026768fe0 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor.2) pid=394866 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800021207800,0xffff8000212a12a8 process=0xffff800021212190 user=0xffff800026764000, vmspace=0xfffffd8066993ce0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38274 377776 61456 32767 7 0x10 syz-executor.7 73353 353221 40711 32767 2 0x10 syz-executor.6 76655 344206 28749 32767 2 0x10 syz-executor.3 76655 258494 28749 32767 3 0x4000090 fsleep syz-executor.3 55659 83139 5405 32767 2 0x10 syz-executor.2 5405 41308 58635 0 3 0x82 wait syz-executor.2 4945 40324 59461 32767 3 0x90 nanoslp syz-executor.5 59461 236247 58635 0 3 0x82 wait syz-executor.5 61456 151178 52990 32767 2 0x10 syz-executor.7 52990 216767 58635 0 3 0x82 wait syz-executor.7 28749 25909 99707 32767 3 0x90 nanoslp syz-executor.3 99707 313192 58635 0 3 0x82 wait syz-executor.3 8331 18755 6104 32767 3 0x90 nanoslp syz-executor.1 6104 224727 58635 0 3 0x82 wait syz-executor.1 46131 113794 59455 32767 3 0x10 biowait syz-executor.4 59455 423765 58635 0 3 0x82 wait syz-executor.4 58620 396649 0 0 3 0x14200 bored sosplice 40711 232376 11804 32767 3 0x90 nanoslp syz-executor.6 11804 341073 58635 0 3 0x82 wait syz-executor.6 98890 431577 48907 32767 2 0x10 syz-executor.0 48907 472284 58635 0 3 0x82 wait syz-executor.0 58635 413088 8901 0 3 0x2000082 thrsleep syz-fuzzer 58635 499780 8901 0 3 0x6000082 thrsleep syz-fuzzer 58635 431376 8901 0 3 0x6000082 thrsleep syz-fuzzer 58635 406665 8901 0 3 0x6000082 wait syz-fuzzer 58635 493408 8901 0 3 0x6000082 wait syz-fuzzer 58635 133751 8901 0 3 0x6000082 thrsleep syz-fuzzer 58635 213106 8901 0 3 0x6000082 thrsleep syz-fuzzer 58635 373716 8901 0 3 0x6000082 wait syz-fuzzer 58635 102964 8901 0 3 0x6000082 kqread syz-fuzzer 58635 191805 8901 0 3 0x6000082 wait syz-fuzzer 58635 181174 8901 0 3 0x6000082 thrsleep syz-fuzzer 58635 313888 8901 0 3 0x6000082 wait syz-fuzzer 58635 126283 8901 0 3 0x6000082 wait syz-fuzzer 58635 432964 8901 0 3 0x6000082 wait syz-fuzzer 58635 330869 8901 0 3 0x6000082 wait syz-fuzzer 58635 156174 8901 0 3 0x6000082 thrsleep syz-fuzzer 8901 104788 14369 0 3 0x10008a sigsusp ksh 14369 347793 30761 0 3 0x9a kqread sshd 65816 78547 1 0 3 0x100083 ttyin getty 30761 327224 1 0 3 0x88 kqread sshd 90449 39561 52664 73 3 0x1100090 kqread syslogd 52664 524205 1 0 3 0x100082 netio syslogd 35969 142841 1 0 3 0x100080 kqread resolvd 67726 341752 61604 77 3 0x100092 kqread dhcpleased 23034 247742 61604 77 3 0x100092 kqread dhcpleased 61604 416724 1 0 3 0x80 kqread dhcpleased 21929 348715 0 0 3 0x14200 bored smr 32346 383328 0 0 2 0x14200 zerothread 91792 210887 0 0 3 0x14200 aiodoned aiodoned 16996 394936 0 0 3 0x14200 syncer update 16540 437356 0 0 3 0x14200 cleaner cleaner 94793 413090 0 0 2 0x14200 reaper 94651 229724 0 0 3 0x14200 pgdaemon pagedaemon 18496 41658 0 0 3 0x14200 bored viomb 57871 96536 0 0 3 0x40014200 acpi0 acpi0 64380 71913 0 0 3 0x40014200 idle1 86734 49497 0 0 3 0x14200 bored softnet3 63192 513548 0 0 3 0x14200 bored softnet2 31112 247378 0 0 3 0x14200 bored softnet1 77862 382101 0 0 3 0x14200 bored softnet0 4385 47178 0 0 3 0x14200 bored systqmp 48890 160825 0 0 3 0x14200 bored systq 44455 384753 0 0 3 0x40014200 bored softclock 1891 519206 0 0 3 0x40014200 idle0 1 310952 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 (0xffffffff82cc8bd0) #0 witness_lock+0x447 #1 sched_idle+0x199 sys/kern/kern_sched.c:172 #2 proc_trampoline+0x1c Process 46131 (syz-executor.4) thread 0xffff800021239540 (113794) exclusive rrwlock inode r = 0 (0xfffffd80705480a0) #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 (0xfffffd8079cafc48) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10188 6408K 6420K 78643K 11317 0 pcb 13 12K 14K 78643K 17 0 rtable 246 7K 7K 78643K 1022 0 pf 29 8K 8K 78643K 63 0 ifaddr 44 15K 15K 78643K 116 0 ifgroup 50 2K 2K 78643K 118 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 35K 78643K 94 0 ioctlops 0 0K 2K 78643K 178 0 iov 0 0K 16K 78643K 880 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 2671 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 104 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 14 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 109K 78643K 8100 0 sigio 1 0K 0K 78643K 2239 0 proc 56 78K 103K 78643K 1466 0 subproc 104 6K 6K 78643K 325 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 360 0 in_multi 99 7K 7K 78643K 331 0 ether_multi 1 0K 0K 78643K 10 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 1K 78643K 1832 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 393 91K 105K 78643K 80569 0 UVM aobj 131 4K 5K 78643K 140 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 134 0 NDP 11 0K 2K 78643K 78 0 temp 74 5920K 6004K 78643K 23915 0 kqueue 13 20K 29K 78643K 878 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 120 497 0 494 8 7 1 3 0 8 0 rtentry 112 314 0 198 4 0 4 4 0 8 0 unpcb 144 5776 0 5763 50 48 2 6 0 8 1 syncache 304 128 0 128 12 11 1 1 0 8 1 tcpqe 32 303 0 303 11 10 1 1 0 8 1 tcpcb 808 11200 0 11180 130 120 10 18 0 8 6 arp 120 53 0 34 1 0 1 1 0 8 0 ipq 40 6 0 6 4 4 0 1 0 8 0 ipqe 40 151 0 151 4 4 0 1 0 8 0 inpcb 368 14042 0 14022 115 103 12 25 0 8 7 nd6 136 90 0 61 3 1 2 2 0 8 0 kcovpl 48 25 0 17 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1288 0 808 35 5 30 31 0 8 0 art_table 32 1289 0 808 4 0 4 4 0 8 0 art_node 16 313 0 207 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 5 1 1 0 1 0 8 0 semupl 112 9 0 9 1 1 0 1 0 8 0 semapl 112 12 0 3 1 0 1 1 0 8 0 shmpl 112 137 0 9 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 11724 0 10281 91 0 91 91 0 8 0 ffsino 272 11724 0 10281 97 0 97 97 0 8 0 nchpl 144 22228 0 20586 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 77121 0 77120 5 4 1 2 0 8 0 percpumem 16 60 0 17 1 0 1 1 0 8 0 kstatmem 264 56 0 34 2 0 2 2 0 8 0 scxspl 216 67319 0 67318 28 26 2 8 1 8 1 plimitpl 152 1090 0 1067 8 6 2 2 0 8 1 sigapl 424 8350 0 8297 7 0 7 7 0 8 0 futexpl 64 64262 0 64261 5 4 1 1 0 8 0 knotepl 120 640 0 0 17 0 17 17 0 8 0 kqueuepl 216 2259 0 2250 32 27 5 9 0 8 4 pipepl 320 3791 0 3762 65 59 6 13 0 8 3 fdescpl 496 8332 0 8299 7 2 5 6 0 8 0 filepl 152 61008 0 60767 115 98 17 24 0 8 6 lockfpl 104 1496 0 1494 1 0 1 1 0 8 0 lockfspl 48 368 0 366 1 0 1 1 0 8 0 sessionpl 144 40 0 24 1 0 1 1 0 8 0 pgrppl 48 168 0 152 1 0 1 1 0 8 0 ucredpl 104 7032 0 7014 1 0 1 1 0 8 0 zombiepl 144 8300 0 8297 1 0 1 1 0 8 0 processpl 1072 8350 0 8297 4 0 4 4 0 8 0 procpl 680 22363 0 22293 19 11 8 9 0 8 1 sosppl 168 100 0 100 10 9 1 1 0 8 1 sockpl 488 20655 0 20619 395 380 15 37 0 8 6 mcl64k 65536 23 0 0 3 1 2 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 29 0 0 3 0 3 3 0 8 0 mcl4k 4096 30 0 0 3 0 3 3 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 410 0 0 39 10 29 39 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 1254 0 0 56 0 56 56 0 8 0 bufpl 288 15978 0 9655 452 0 452 452 0 8 0 anonpl 24 888376 0 877137 188 92 96 101 0 186 2 amapchunkpl 152 255180 0 254339 101 61 40 50 0 158 0 amappl16 200 20283 0 20021 139 116 23 34 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 200 0 188 2 1 1 2 0 8 0 amappl13 176 13 0 13 3 3 0 1 0 8 0 amappl12 168 9199 0 9164 2 0 2 2 0 8 0 amappl11 160 55 0 43 1 0 1 1 0 8 0 amappl10 152 43 0 33 1 0 1 1 0 8 0 amappl9 144 257 0 256 1 0 1 1 0 8 0 amappl8 136 475 0 347 6 1 5 5 0 8 0 amappl7 128 108 0 93 2 0 2 2 0 8 0 amappl6 120 409 0 388 2 1 1 2 0 8 0 amappl5 112 390 0 381 1 0 1 1 0 8 0 amappl4 104 799 0 755 3 1 2 3 0 8 0 amappl3 96 50204 0 50125 6 3 3 4 0 8 0 amappl2 88 8914 0 8840 3 1 2 3 0 8 0 amappl1 80 38056 0 37532 22 10 12 22 0 8 0 amappl 88 79658 0 79423 7 0 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 72 139 0 9 3 0 3 3 0 8 0 uaddrrnd 24 8332 0 8299 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8332 0 8299 1 0 1 1 0 8 0 vmmpekpl 168 73299 0 73233 4 0 4 4 0 8 0 vmmpepl 168 497195 0 494906 190 71 119 123 0 357 6 vmsppl 464 8331 0 8299 7 2 5 5 0 8 0 rwobjpl 56 131526 0 124159 126 17 109 110 0 8 1 pdppl 4096 16672 0 16598 362 280 82 88 0 8 8 pvpl 32 2418137 0 2400896 454 266 188 350 0 265 14 pmappl 248 8331 0 8299 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1421 0 537 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c05ff0) 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(ffffffff82ca0020) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800022ceeef0,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800022cef0c0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800022cef0c0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e92eb8acf70, count: 6 ddb{0}> trace x86_ipi_db(ffffffff82c05ff0) 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(ffffffff82ca0020) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800022ceeef0,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ca0020) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800022cef0c0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800022cef0c0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e92eb8acf70, count: -9 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx witness_checkorder(fffffd806f1ff520,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f1ff510) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021207d50,fffffd806f1ff510,fffffd806f1ff598,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021207d50,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021207d50) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021207d50,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021207d50,ffff8000267692f0,ffff800026769340) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000267693c0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000267693c0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7eff82c99600, count: 6 ddb{1}> trace witness_checkorder(fffffd806f1ff520,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f1ff510) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021207d50,fffffd806f1ff510,fffffd806f1ff598,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021207d50,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021207d50) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021207d50,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021207d50,ffff8000267692f0,ffff800026769340) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000267693c0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000267693c0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7eff82c99600, count: -9