uvm_fault(0xfffffd8069b6b1f0, 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 253638 84097 32767 0x1010 0x4080000 0 syz-executor.1 witness_checkorder(fffffd806f0f7cb8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0f7ca8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021298008,fffffd806f0f7ca8,fffffd806f0f7d30,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021298008,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021298008) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021298008,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021298008,ffff80002fe39d90,ffff80002fe39de0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fe39e60) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe39e60) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7167272e8570, 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(0xfffffd8069b6b1f0, 0x18ff000008, 0, 1) -> e ddb{1}> trace witness_checkorder(fffffd806f0f7cb8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0f7ca8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021298008,fffffd806f0f7ca8,fffffd806f0f7d30,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021298008,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021298008) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021298008,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021298008,ffff80002fe39d90,ffff80002fe39de0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fe39e60) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe39e60) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7167272e8570, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff80002fe39b30 rbx 0xe rdx 0 rcx 0xffff800021298008 rax 0xffff800020d58ff0 r8 0x1 r9 0x1 r10 0x7355189ba4c14a94 r11 0xb2ff3660bda637bb r12 0 r13 0xfffffd806f0f7cb8 r14 0x18ff000000 r15 0xffff800021298008 rip 0xffffffff81ef9c8c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002fe39a80 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor.2) pid=33955 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff800021298d50,0xffff800021224560 process=0xffff80002e426e30 user=0xffff80002fe34000, vmspace=0xfffffd8069b6b1f0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 63993 56347 29901 32767 3 0x90 nanoslp syz-executor.0 63993 242372 29901 32767 3 0x4000090 fsleep syz-executor.0 63993 191385 29901 32767 3 0x4000090 fsleep syz-executor.0 47721 520499 16629 32767 2 0x10 syz-executor.3 84097 74667 55365 32767 3 0x3010 suspend syz-executor.1 84097 253638 55365 32767 7 0x4081010 syz-executor.1 40684 432301 74551 32767 3 0x90 nanoslp syz-executor.6 40684 379257 74551 32767 3 0x4000090 nanoslp syz-executor.6 40684 357900 74551 32767 3 0x4000090 fsleep syz-executor.6 16629 38983 93389 32767 3 0x90 nanoslp syz-executor.3 93389 204625 20352 0 3 0x82 wait syz-executor.3 19660 270067 0 0 3 0x14200 bored sosplice 74551 75572 27269 32767 3 0x90 nanoslp syz-executor.6 27269 53288 20352 0 3 0x82 wait syz-executor.6 79216 411310 47826 0 3 0x100082 netio ndp 47826 174492 5446 0 3 0x10008a sigsusp sh 87110 431368 95454 32767 3 0x90 nanoslp syz-executor.7 46246 340266 99830 32767 3 0x10 biowait syz-executor.5 99830 109102 20352 0 3 0x82 wait syz-executor.5 95454 36937 20352 0 3 0x82 wait syz-executor.7 5446 154512 1 0 3 0x80 wait syz-executor.6 29268 194395 7145 32767 3 0x90 nanoslp syz-executor.4 7145 323288 20352 0 3 0x82 wait syz-executor.4 79788 508517 52805 32767 3 0x90 nanoslp syz-executor.2 55365 489045 32840 32767 3 0x90 nanoslp syz-executor.1 52805 389624 20352 0 3 0x82 wait syz-executor.2 29901 509725 67736 32767 3 0x90 nanoslp syz-executor.0 32840 399854 20352 0 3 0x82 wait syz-executor.1 67736 204501 20352 0 3 0x82 wait syz-executor.0 20352 345229 3389 0 3 0x2000082 thrsleep syz-fuzzer 20352 521665 3389 0 3 0x6000082 nanoslp syz-fuzzer 20352 97776 3389 0 3 0x6000082 wait syz-fuzzer 20352 151445 3389 0 3 0x6000082 wait syz-fuzzer 20352 459411 3389 0 3 0x6000082 wait syz-fuzzer 20352 280719 3389 0 3 0x6000082 wait syz-fuzzer 20352 112803 3389 0 3 0x6000082 thrsleep syz-fuzzer 20352 521391 3389 0 3 0x6000082 wait syz-fuzzer 20352 334163 3389 0 3 0x6000082 thrsleep syz-fuzzer 20352 77605 3389 0 3 0x6000082 thrsleep syz-fuzzer 20352 95031 3389 0 3 0x6000082 thrsleep syz-fuzzer 20352 69505 3389 0 3 0x6000082 wait syz-fuzzer 20352 245793 3389 0 3 0x6000082 wait syz-fuzzer 20352 146796 3389 0 3 0x6000082 thrsleep syz-fuzzer 20352 262379 3389 0 3 0x6000082 wait syz-fuzzer 20352 196161 3389 0 3 0x6000082 kqread syz-fuzzer 3389 171132 59160 0 3 0x10008a sigsusp ksh 59160 253593 48294 0 3 0x9a kqread sshd 98979 92872 1 0 3 0x100083 ttyin getty 48294 422367 1 0 3 0x88 kqread sshd 41836 448097 86002 73 3 0x1100090 kqread syslogd 86002 28208 1 0 3 0x100082 netio syslogd 14167 11489 1 0 3 0x100080 kqread resolvd 68009 96017 87700 77 3 0x100092 kqread dhcpleased 8277 73578 87700 77 3 0x100092 kqread dhcpleased 87700 438403 1 0 3 0x80 kqread dhcpleased 70217 126632 0 0 3 0x14200 bored smr 25500 114469 0 0 2 0x14200 zerothread 14200 283286 0 0 3 0x14200 aiodoned aiodoned 31568 4073 0 0 3 0x14200 syncer update 92294 437491 0 0 3 0x14200 cleaner cleaner 60537 507440 0 0 2 0x14200 reaper 28842 460056 0 0 3 0x14200 pgdaemon pagedaemon 36199 82312 0 0 3 0x14200 bored viomb 54025 309404 0 0 3 0x40014200 acpi0 acpi0 4322 128738 0 0 3 0x40014200 idle1 49920 329094 0 0 3 0x14200 bored softnet3 20075 273630 0 0 3 0x14200 bored softnet2 17229 499524 0 0 3 0x14200 bored softnet1 53745 147507 0 0 3 0x14200 bored softnet0 70151 266920 0 0 3 0x14200 bored systqmp 38984 501396 0 0 3 0x14200 bored systq 38636 425441 0 0 3 0x40014200 bored softclock 71718 482507 0 0 3 0x40014200 idle0 1 300371 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 84097 (syz-executor.1) thread 0xffff8000211f52b0 (253638) exclusive rwlock futexpl r = 0 (0xffffffff82d8bd30) #0 witness_lock+0x447 #1 pool_put+0x84 sys/kern/subr_pool.c:797 #2 futex_wait+0x218 sys/kern/sys_futex.c:265 #3 sys_futex+0xfc sys/kern/sys_futex.c:101 #4 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #4 syscall+0x606 sys/arch/amd64/amd64/trap.c:623 #5 Xsyscall+0x128 exclusive rwlock futex r = 0 (0xffffffff82c40fd0) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rwsleep+0xd6 sys/kern/kern_synch.c:303 #3 futex_wait+0x13d sys/kern/sys_futex.c:250 #4 sys_futex+0xfc sys/kern/sys_futex.c:101 #5 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #5 syscall+0x606 sys/arch/amd64/amd64/trap.c:623 #6 Xsyscall+0x128 Process 46246 (syz-executor.5) thread 0xffff800021224d48 (340266) exclusive rrwlock inode r = 0 (0xfffffd807a1e7b40) #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 (0xfffffd807051ea38) #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 10194 6409K 6420K 78643K 11281 0 pcb 13 8K 8K 78643K 13 0 rtable 240 6K 7K 78643K 484 0 pf 29 8K 8K 78643K 35 0 ifaddr 44 15K 15K 78643K 58 0 ifgroup 50 2K 2K 78643K 62 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 35K 78643K 66 0 ioctlops 0 0K 2K 78643K 39 0 iov 0 0K 24K 78643K 1748 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1291 81K 81K 78643K 3630 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 65 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 80 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 26 97K 117K 78643K 3383 0 sigio 0 0K 0K 78643K 47 0 proc 57 90K 103K 78643K 727 0 subproc 117 7K 7K 78643K 143 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 1 0K 0K 78643K 617 0 in_multi 99 7K 7K 78643K 138 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 103 466K 466K 78643K 103 0 exec 0 0K 1K 78643K 1231 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 382 98K 104K 78643K 35490 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 95 0 NDP 11 0K 2K 78643K 36 0 temp 78 5920K 5984K 78643K 11277 0 kqueue 12 18K 25K 78643K 339 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 120 182 0 178 3 2 1 2 0 8 0 rtentry 112 147 0 34 4 0 4 4 0 8 0 unpcb 144 1424 0 1408 20 13 7 7 0 8 6 syncache 304 52 0 52 8 7 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 196 0 196 9 8 1 1 0 8 1 tcpcb 808 1097 0 1074 40 37 3 9 0 8 0 arp 120 24 0 6 1 0 1 1 0 8 0 ipq 40 8 0 8 4 3 1 1 0 8 1 ipqe 40 89 0 89 4 3 1 1 0 8 1 inpcb 368 2993 0 2966 54 48 6 11 0 8 3 nd6 136 36 0 9 1 0 1 1 0 8 0 kcovpl 48 11 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 602 0 133 30 0 30 30 0 8 0 art_table 32 603 0 133 4 0 4 4 0 8 0 art_node 16 146 0 43 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 1 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 40 0 30 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 7409 0 5964 91 0 91 91 0 8 0 ffsino 272 7409 0 5964 97 0 97 97 0 8 0 nchpl 144 11856 0 10207 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 42073 0 42073 5 4 1 2 0 8 1 percpumem 16 46 0 3 1 0 1 1 0 8 0 kstatmem 264 28 0 6 2 0 2 2 0 8 0 scxspl 216 32523 0 32522 11 10 1 8 1 8 0 plimitpl 152 562 0 538 9 8 1 2 0 8 0 sigapl 424 3670 0 3613 7 0 7 7 0 8 0 futexpl 64 27675 0 27672 5 4 1 1 0 8 0 knotepl 120 239 0 0 6 1 5 6 0 8 0 kqueuepl 216 1026 0 1018 25 24 1 6 0 8 0 pipepl 320 938 0 907 29 26 3 8 0 8 0 fdescpl 496 3652 0 3615 7 1 6 6 0 8 0 filepl 152 28343 0 28083 63 45 18 19 0 8 7 lockfpl 104 262 0 260 1 0 1 1 0 8 0 lockfspl 48 92 0 90 1 0 1 1 0 8 0 sessionpl 144 26 0 9 1 0 1 1 0 8 0 pgrppl 48 26 0 9 1 0 1 1 0 8 0 ucredpl 104 10797 0 10779 1 0 1 1 0 8 0 zombiepl 144 3616 0 3613 2 1 1 1 0 8 0 processpl 1072 3670 0 3613 5 0 5 5 0 8 0 procpl 680 9710 0 9632 13 5 8 9 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 186 0 184 9 8 1 1 0 8 0 sockpl 488 4718 0 4671 98 84 14 26 0 8 8 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 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 25 0 0 3 0 3 3 0 8 0 mcl4k 4096 39 0 0 3 0 3 3 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 356 0 0 40 6 34 40 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1090 0 0 60 0 60 60 0 8 0 bufpl 288 8368 0 2040 453 0 453 453 0 8 0 anonpl 24 518379 0 506880 156 74 82 99 0 186 0 amapchunkpl 152 113590 0 112657 81 35 46 50 0 158 6 amappl16 200 12768 0 12508 87 71 16 27 0 8 0 amappl15 192 13 0 13 3 3 0 1 0 8 0 amappl14 184 160 0 145 2 1 1 2 0 8 0 amappl13 176 20 0 19 1 0 1 1 0 8 0 amappl12 168 4326 0 4286 2 0 2 2 0 8 0 amappl11 160 48 0 38 1 0 1 1 0 8 0 amappl10 152 38 0 25 1 0 1 1 0 8 0 amappl9 144 223 0 221 1 0 1 1 0 8 0 amappl8 136 291 0 214 3 0 3 3 0 8 0 amappl7 128 86 0 72 2 0 2 2 0 8 0 amappl6 120 275 0 256 2 1 1 2 0 8 0 amappl5 112 248 0 239 1 0 1 1 0 8 0 amappl4 104 598 0 557 3 1 2 3 0 8 0 amappl3 96 22404 0 22304 11 7 4 4 0 8 1 amappl2 88 4049 0 3972 3 1 2 3 0 8 0 amappl1 80 21093 0 20529 22 9 13 22 0 8 0 amappl 88 34877 0 34616 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 3652 0 3615 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3652 0 3615 1 0 1 1 0 8 0 vmmpekpl 168 32596 0 32527 4 0 4 4 0 8 0 vmmpepl 168 230126 0 227712 189 76 113 124 0 357 0 vmsppl 464 3651 0 3615 7 1 6 6 0 8 0 rwobjpl 56 70394 0 62979 119 13 106 109 0 8 0 pdppl 4096 7312 0 7230 247 159 88 94 0 8 6 pvpl 32 1290916 0 1272887 414 249 165 353 0 265 6 pmappl 248 3651 0 3615 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1149 0 261 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(ffff80002e41da70,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+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ca0020) at __mp_lock+0x129 sys/kern/kern_lock.c:147 single_thread_check_locked(ffff8000211f52b0,0) at single_thread_check_locked+0x23a sys/kern/kern_sig.c:2033 userret(ffff8000211f52b0) at userret+0x72 single_thread_check sys/kern/kern_sig.c:2060 [inline] userret(ffff8000211f52b0) at userret+0x72 sys/kern/kern_sig.c:1970 syscall(ffff80002e41dd20) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff80002e41dd20) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x46758aafc00, count: 4 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(ffff80002e41da70,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+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ca0020) at __mp_lock+0x129 sys/kern/kern_lock.c:147 single_thread_check_locked(ffff8000211f52b0,0) at single_thread_check_locked+0x23a sys/kern/kern_sig.c:2033 userret(ffff8000211f52b0) at userret+0x72 single_thread_check sys/kern/kern_sig.c:2060 [inline] userret(ffff8000211f52b0) at userret+0x72 sys/kern/kern_sig.c:1970 syscall(ffff80002e41dd20) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff80002e41dd20) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x46758aafc00, count: -11 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx witness_checkorder(fffffd806f0f7cb8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0f7ca8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021298008,fffffd806f0f7ca8,fffffd806f0f7d30,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021298008,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021298008) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021298008,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021298008,ffff80002fe39d90,ffff80002fe39de0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fe39e60) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe39e60) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7167272e8570, count: 6 ddb{1}> trace witness_checkorder(fffffd806f0f7cb8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0f7ca8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021298008,fffffd806f0f7ca8,fffffd806f0f7d30,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021298008,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021298008) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021298008,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021298008,ffff80002fe39d90,ffff80002fe39de0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002fe39e60) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe39e60) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7167272e8570, count: -9