uvm_fault(0xfffffd806fa00018, 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 14747 12581 0 0 0 0 syz-executor3863784987 witness_checkorder(fffffd806f0db0e8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0db0d8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000211f42c0,fffffd806f0db0d8,fffffd806f0db160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211f42c0,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211f42c0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211f42c0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211f42c0,ffff80002127b280,ffff80002127b2d0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002127b350) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002127b350) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fd9e6e5e580, 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(0xfffffd806fa00018, 0x18ff000008, 0, 1) -> e ddb{1}> trace witness_checkorder(fffffd806f0db0e8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0db0d8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000211f42c0,fffffd806f0db0d8,fffffd806f0db160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211f42c0,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211f42c0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211f42c0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211f42c0,ffff80002127b280,ffff80002127b2d0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002127b350) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002127b350) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fd9e6e5e580, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff80002127b020 rbx 0xe rdx 0 rcx 0xfffffd8003971d80 rax 0xffff800020d58ff0 r8 0 r9 0x1 r10 0xe724f693828d3594 r11 0x1ed9ca7b69700f92 r12 0 r13 0xfffffd806f0db0e8 r14 0x18ff000000 r15 0xffff8000211f42c0 rip 0xffffffff81ef9c8c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002127af70 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor3863784987) pid=378478 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000211f5008,0xffff8000211f4820 process=0xffff8000ffff8c98 user=0xffff800021276000, vmspace=0xfffffd806fa00018 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 41988 444983 9823 0 2 0 syz-executor3863784987 12581 14747 40403 0 7 0 syz-executor3863784987 92127 129033 35794 0 3 0 biowait syz-executor3863784987 8038 298360 35794 0 2 0 syz-executor3863784987 9823 253767 35794 0 2 0 syz-executor3863784987 40403 420230 35794 0 3 0x80 nanoslp syz-executor3863784987 23792 389895 35794 0 3 0 biowait syz-executor3863784987 27173 422417 35794 0 3 0 biowait syz-executor3863784987 78788 299090 35794 0 3 0x80 nanoslp syz-executor3863784987 20193 281319 35794 0 3 0x80 nanoslp syz-executor3863784987 35794 20074 94415 0 3 0x82 nanoslp syz-executor3863784987 94415 463218 13217 0 3 0x10008a sigsusp ksh 13217 513852 3888 0 2 0x12 sshd 51518 60429 1 0 3 0x100083 ttyin getty 3888 416823 1 0 3 0x88 kqread sshd 70535 133840 60718 73 3 0x1100090 kqread syslogd 60718 13413 1 0 3 0x100082 netio syslogd 51268 440106 1 0 3 0x100080 kqread resolvd 82462 511291 37222 77 3 0x100092 kqread dhcpleased 61808 239455 37222 77 3 0x100092 kqread dhcpleased 37222 215862 1 0 3 0x80 kqread dhcpleased 33692 292303 0 0 3 0x14200 bored smr 46521 106155 0 0 2 0x14200 zerothread 19433 217810 0 0 3 0x14200 aiodoned aiodoned 46573 155689 0 0 3 0x14200 syncer update 13042 73100 0 0 3 0x14200 cleaner cleaner 67061 378366 0 0 2 0x14200 reaper 38698 326692 0 0 3 0x14200 pgdaemon pagedaemon 37656 356481 0 0 3 0x14200 bored viomb 59197 133894 0 0 3 0x40014200 acpi0 acpi0 69118 426126 0 0 3 0x40014200 idle1 88044 143238 0 0 3 0x14200 bored softnet3 34192 145488 0 0 3 0x14200 bored softnet2 89751 28771 0 0 3 0x14200 bored softnet1 57376 349316 0 0 3 0x14200 bored softnet0 48602 5498 0 0 3 0x14200 bored systqmp 55615 49803 0 0 3 0x14200 bored systq 52035 238613 0 0 3 0x40014200 bored softclock 78302 501128 0 0 3 0x40014200 idle0 1 416781 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 92127 (syz-executor3863784987) thread 0xffff8000211f5008 (129033) exclusive rrwlock inode r = 0 (0xfffffd806d1e86f8) #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 (0xfffffd806d639a38) #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 23792 (syz-executor3863784987) thread 0xffff8000211eed58 (389895) exclusive rrwlock inode r = 0 (0xfffffd806d1e8f78) #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 (0xfffffd806d6394e8) #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 27173 (syz-executor3863784987) thread 0xffff8000211ef7f8 (422417) exclusive rrwlock inode r = 0 (0xfffffd806d1e8808) #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 (0xfffffd806d6393d8) #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 10156 6389K 6420K 78643K 11234 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 110 0 pf 12 6K 6K 78643K 12 0 ifaddr 12 9K 9K 78643K 12 0 ifgroup 17 1K 1K 78643K 17 0 counters 44 33K 33K 78643K 44 0 ioctlops 0 0K 2K 78643K 21 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1174 73K 74K 78643K 1187 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 78K 79K 78643K 246 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 25 122K 122K 78643K 25 0 exec 0 0K 1K 78643K 243 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 114 5K 5K 78643K 2374 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 1 5904K 5968K 78643K 2913 0 kqueue 11 16K 18K 78643K 36 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 20 0 17 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 33 0 20 1 0 1 1 0 8 0 syncache 304 5 0 5 2 1 1 1 0 8 1 tcpqe 32 195 0 195 1 1 0 1 0 8 0 tcpcb 808 32 0 27 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 50 0 44 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1447 0 46 88 0 88 88 0 8 0 ffsino 272 1447 0 46 94 0 94 94 0 8 0 nchpl 144 1644 0 70 59 0 59 59 0 8 0 uvmvnodes 80 1456 0 0 30 0 30 30 0 8 0 vnodes 216 1456 0 0 81 0 81 81 0 8 0 namei 1024 4329 0 4326 3 1 2 2 0 8 1 percpumem 16 35 0 0 1 0 1 1 0 8 0 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 5001 0 4998 3 2 1 2 1 8 0 plimitpl 152 16 0 10 1 0 1 1 0 8 0 sigapl 424 331 0 289 5 0 5 5 0 8 0 futexpl 64 81 0 81 1 0 1 1 0 8 1 knotepl 120 39 0 0 2 0 2 2 0 8 0 kqueuepl 216 32 0 25 1 0 1 1 0 8 0 pipepl 320 87 0 84 2 1 1 1 0 8 0 fdescpl 496 314 0 290 5 1 4 4 0 8 1 filepl 152 1160 0 1105 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 66 0 56 1 0 1 1 0 8 0 zombiepl 144 291 0 289 2 1 1 1 0 8 0 processpl 1072 331 0 289 3 0 3 3 0 8 0 procpl 680 343 0 300 4 0 4 4 0 8 0 sockpl 488 103 0 80 4 0 4 4 0 8 1 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 244 0 0 31 0 31 31 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 252 0 0 16 0 16 16 0 8 0 bufpl 288 2538 0 88 175 0 175 175 0 8 0 anonpl 24 153936 0 151954 23 10 13 23 0 186 0 amapchunkpl 152 8076 0 7861 11 1 10 10 0 158 1 amappl16 200 4112 0 4106 6 5 1 5 0 8 0 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 98 0 89 1 0 1 1 0 8 0 amappl13 176 12 0 12 1 1 0 1 0 8 0 amappl12 168 806 0 786 1 0 1 1 0 8 0 amappl11 160 58 0 48 1 0 1 1 0 8 0 amappl10 152 12 0 12 2 1 1 1 0 8 1 amappl9 144 163 0 163 2 1 1 1 0 8 1 amappl8 136 26 0 24 1 0 1 1 0 8 0 amappl7 128 38 0 26 1 0 1 1 0 8 0 amappl6 120 138 0 125 1 0 1 1 0 8 0 amappl5 112 102 0 94 1 0 1 1 0 8 0 amappl4 104 410 0 383 1 0 1 1 0 8 0 amappl3 96 2392 0 2348 2 0 2 2 0 8 0 amappl2 88 497 0 452 3 1 2 2 0 8 0 amappl1 80 9098 0 8646 14 3 11 11 0 8 0 amappl 88 2106 0 2029 2 0 2 2 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 314 0 290 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 314 0 290 1 0 1 1 0 8 0 vmmpekpl 168 6818 0 6798 2 0 2 2 0 8 1 vmmpepl 168 33709 0 32515 57 4 53 53 0 357 1 vmsppl 464 313 0 290 4 1 3 3 0 8 0 rwobjpl 56 17732 0 15639 31 1 30 31 0 8 0 pdppl 4096 636 0 580 76 20 56 56 0 8 0 pvpl 32 249283 0 244441 52 12 40 52 0 265 0 pmappl 248 313 0 290 3 1 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 504 0 23 14 0 14 14 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(ffff800021281420,ffff80000067b200) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_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 syscall(ffff8000212815f0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212815f0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fd9e6e5e410, 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(ffff800021281420,ffff80000067b200) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_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 syscall(ffff8000212815f0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212815f0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fd9e6e5e410, count: -9 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx witness_checkorder(fffffd806f0db0e8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0db0d8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000211f42c0,fffffd806f0db0d8,fffffd806f0db160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211f42c0,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211f42c0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211f42c0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211f42c0,ffff80002127b280,ffff80002127b2d0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002127b350) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002127b350) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fd9e6e5e580, count: 6 ddb{1}> trace witness_checkorder(fffffd806f0db0e8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f0db0d8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000211f42c0,fffffd806f0db0d8,fffffd806f0db160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000211f42c0,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000211f42c0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000211f42c0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000211f42c0,ffff80002127b280,ffff80002127b2d0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002127b350) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002127b350) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fd9e6e5e580, count: -9 ddb{1}>