kernel: protection fault trap, code=0 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace witness_checkorder(fffffd807e8331c0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd807e8331b0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021238d68,fffffd807e8331b0,fffffd807e833238,5,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021238d68,5) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021238d68) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021238d68,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021238d68,ffff80002e403cc0,ffff80002e403d10) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e403d90) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e403d90) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cc468ed6f90, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff80002e403a60 rbx 0xe rdx 0 rcx 0xffff800021238d68 rax 0xffff800020d58ff0 r8 0x1 r9 0x1 r10 0x37be82e2bcccf901 r11 0xed13a8a3a02b6865 r12 0 r13 0xfffffd807e8331c0 r14 0xfffeffff00010000 r15 0xffff800021238d68 rip 0xffffffff81eeff1c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002e4039b0 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor.2) pid=240178 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff80002128e570,0xffff800021238030 process=0xffff8000ffff8868 user=0xffff80002e3fe000, vmspace=0xfffffd8077ab1598 estcpu=33, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 29253 326498 9269 32767 2 0x10 syz-executor.3 29253 184964 9269 32767 3 0x4000090 fsleep syz-executor.3 44293 440711 31625 32767 3 0x90 nanoslp syz-executor.0 44293 337833 31625 32767 3 0x4000090 fsleep syz-executor.0 60033 6771 44420 32767 2 0x10 syz-executor.5 60033 160254 44420 32767 2 0x4000010 syz-executor.5 60033 427457 44420 32767 2 0x4000010 syz-executor.5 60033 212684 44420 32767 3 0x4000090 fsleep syz-executor.5 1455 371129 0 0 3 0x14200 bored sosplice 66704 153761 93546 32767 3 0x90 nanoslp syz-executor.6 23090 348884 70118 32767 3 0x10 biowait syz-executor.7 93546 86512 68672 0 3 0x82 wait syz-executor.6 44420 448766 64701 32767 3 0x90 nanoslp syz-executor.5 70118 517190 68672 0 3 0x82 wait syz-executor.7 64701 54035 68672 0 3 0x82 wait syz-executor.5 37860 191758 13992 32767 3 0x10 biowait syz-executor.4 13992 289287 68672 0 3 0x82 wait syz-executor.4 9269 200468 68053 32767 3 0x90 nanoslp syz-executor.3 68053 501850 68672 0 3 0x82 wait syz-executor.3 19851 218440 17905 32767 3 0x10 biowait syz-executor.1 70031 272358 82544 32767 3 0x90 nanoslp syz-executor.2 17905 19385 68672 0 3 0x82 wait syz-executor.1 82544 124925 68672 0 3 0x82 wait syz-executor.2 31625 324767 89153 32767 3 0x90 nanoslp syz-executor.0 89153 216840 68672 0 3 0x82 wait syz-executor.0 68672 315465 94178 0 3 0x2000082 wait syz-fuzzer 68672 110614 94178 0 3 0x6000082 thrsleep syz-fuzzer 68672 18875 94178 0 3 0x6000082 wait syz-fuzzer 68672 471582 94178 0 3 0x6000082 wait syz-fuzzer 68672 485252 94178 0 3 0x6000082 wait syz-fuzzer 68672 481066 94178 0 3 0x6000082 wait syz-fuzzer 68672 10892 94178 0 3 0x6000082 kqread syz-fuzzer 68672 250733 94178 0 3 0x6000082 thrsleep syz-fuzzer 68672 134222 94178 0 3 0x6000082 thrsleep syz-fuzzer 68672 75109 94178 0 3 0x6000082 wait syz-fuzzer 68672 335290 94178 0 3 0x6000082 thrsleep syz-fuzzer 68672 328769 94178 0 3 0x6000082 wait syz-fuzzer 68672 367776 94178 0 3 0x6000082 wait syz-fuzzer 68672 242681 94178 0 3 0x6000082 thrsleep syz-fuzzer 68672 61153 94178 0 3 0x6000082 thrsleep syz-fuzzer 68672 123655 94178 0 3 0x6000082 thrsleep syz-fuzzer 68672 271883 94178 0 3 0x6000082 thrsleep syz-fuzzer 94178 518153 68855 0 3 0x10008a sigsusp ksh 68855 48728 42506 0 3 0x9a kqread sshd 8849 48101 1 0 3 0x100083 ttyin getty 42506 442665 1 0 3 0x88 kqread sshd 91329 382780 64689 73 3 0x1100090 kqread syslogd 64689 95990 1 0 3 0x100082 netio syslogd 943 464258 1 0 3 0x100080 kqread resolvd 71922 246139 93588 77 3 0x100092 kqread dhcpleased 17867 396821 93588 77 3 0x100092 kqread dhcpleased 93588 173555 1 0 3 0x80 kqread dhcpleased 80307 519612 0 0 3 0x14200 bored smr 87044 229776 0 0 2 0x14200 zerothread 55157 110125 0 0 3 0x14200 aiodoned aiodoned 52261 481371 0 0 3 0x14200 syncer update 37780 520606 0 0 3 0x14200 cleaner cleaner 49077 479965 0 0 7 0x14200 reaper 40145 504717 0 0 3 0x14200 pgdaemon pagedaemon 25825 437212 0 0 3 0x14200 bored viomb 92834 191487 0 0 3 0x40014200 acpi0 acpi0 45362 392519 0 0 3 0x40014200 idle1 68692 78263 0 0 3 0x14200 bored softnet3 77622 502538 0 0 3 0x14200 bored softnet2 97780 421939 0 0 3 0x14200 bored softnet1 79918 503229 0 0 2 0x14200 softnet0 85719 13816 0 0 3 0x14200 bored systqmp 60474 351199 0 0 3 0x14200 bored systq 46263 395227 0 0 3 0x40014200 bored softclock 43629 142484 0 0 3 0x40014200 idle0 1 142178 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 23090 (syz-executor.7) thread 0xffff800021269540 (348884) exclusive rrwlock inode r = 0 (0xfffffd80774d1f78) #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 (0xfffffd8077a743d8) #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 37860 (syz-executor.4) thread 0xffff8000211ee2b8 (191758) exclusive rrwlock inode r = 0 (0xfffffd80774d1c48) #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 (0xfffffd806763a1b0) #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 19851 (syz-executor.1) thread 0xffff80002128f010 (218440) exclusive rrwlock inode r = 0 (0xfffffd806e69fa38) #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 (0xfffffd806763aa30) #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 10210 6412K 6420K 78643K 11289 0 pcb 13 12K 14K 78643K 17 0 rtable 236 6K 7K 78643K 972 0 pf 29 8K 8K 78643K 29 0 ifaddr 44 15K 15K 78643K 46 0 ifgroup 50 2K 2K 78643K 50 0 sysctl 3 1K 1K 78643K 3 0 counters 60 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 50 0 iov 0 0K 18K 78643K 485 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 4047 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 25K 78643K 124 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 630 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 109K 78643K 6605 0 sigio 1 0K 0K 78643K 614 0 proc 56 78K 115K 78643K 762 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 812 0 in_multi 99 7K 7K 78643K 268 0 ether_multi 1 0K 0K 78643K 18 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 199 890K 890K 78643K 199 0 exec 0 0K 1K 78643K 651 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 343 85K 92K 78643K 64263 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 153 0 NDP 11 0K 2K 78643K 27 0 temp 74 5920K 6048K 78643K 17501 0 kqueue 12 18K 26K 78643K 409 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 120 409 0 406 5 4 1 3 0 8 0 rtentry 112 116 0 5 4 0 4 4 0 8 0 unpcb 144 1742 0 1729 23 22 1 9 0 8 0 syncache 304 170 0 170 11 10 1 1 0 8 1 tcpqe 32 190 0 190 9 9 0 1 0 8 0 tcpcb 808 5070 0 5006 59 47 12 13 0 8 5 arp 120 20 0 1 1 0 1 1 0 8 0 ipq 40 20 0 19 5 4 1 1 0 8 0 ipqe 40 77 0 75 5 4 1 1 0 8 0 inpcb 368 6914 0 6811 57 45 12 18 0 8 2 nd6 136 27 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 470 0 17 29 0 29 29 0 8 0 art_table 32 471 0 17 4 0 4 4 0 8 0 art_node 16 115 0 14 1 0 1 1 0 8 0 semapl 112 628 0 618 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 11535 0 10087 91 0 91 91 0 8 0 ffsino 272 11535 0 10087 97 0 97 97 0 8 0 nchpl 144 19946 0 18265 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 61639 0 61637 6 5 1 2 0 8 0 percpumem 16 43 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 56157 0 56154 26 23 3 8 1 8 2 plimitpl 152 634 0 611 7 6 1 2 0 8 0 sigapl 424 6906 0 6854 7 0 7 7 0 8 0 futexpl 64 53705 0 53702 5 4 1 1 0 8 0 knotepl 120 279 0 0 8 0 8 8 0 8 0 kqueuepl 216 4197 0 4188 28 20 8 8 0 8 7 pipepl 320 1200 0 1171 27 19 8 8 0 8 5 fdescpl 496 6888 0 6855 7 2 5 6 0 8 0 filepl 152 41702 0 41414 61 43 18 20 0 8 6 lockfpl 104 1253 0 1251 1 0 1 1 0 8 0 lockfspl 48 352 0 350 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 33 0 17 1 0 1 1 0 8 0 ucredpl 104 13323 0 13305 1 0 1 1 0 8 0 zombiepl 144 6856 0 6854 3 2 1 1 0 8 0 processpl 1072 6906 0 6854 4 0 4 4 0 8 0 procpl 680 17347 0 17273 15 7 8 8 0 8 0 sosppl 168 109 0 109 10 9 1 1 0 8 1 sockpl 488 9110 0 8985 122 103 19 37 0 8 3 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 40 0 0 3 1 2 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 471 0 0 34 6 28 34 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1351 0 0 66 0 66 66 0 8 0 bufpl 288 15628 0 9302 453 1 452 453 0 8 0 anonpl 24 776491 0 768425 194 118 76 104 0 186 11 amapchunkpl 152 205358 0 204561 91 53 38 61 0 158 3 amappl16 200 19181 0 19028 150 134 16 40 0 8 7 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 156 0 143 2 1 1 2 0 8 0 amappl13 176 50 0 47 1 0 1 1 0 8 0 amappl12 168 7531 0 7496 2 0 2 2 0 8 0 amappl11 160 55 0 45 1 0 1 1 0 8 0 amappl10 152 29 0 20 2 1 1 1 0 8 0 amappl9 144 174 0 173 2 1 1 1 0 8 0 amappl8 136 352 0 263 4 0 4 4 0 8 0 amappl7 128 90 0 76 2 0 2 2 0 8 0 amappl6 120 265 0 246 1 0 1 1 0 8 0 amappl5 112 264 0 256 1 0 1 1 0 8 0 amappl4 104 622 0 588 2 0 2 2 0 8 0 amappl3 96 40622 0 40534 6 3 3 4 0 8 0 amappl2 88 7286 0 7215 3 1 2 3 0 8 0 amappl1 80 31718 0 31182 22 10 12 22 0 8 0 amappl 88 63617 0 63401 6 0 6 6 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 6888 0 6855 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6888 0 6855 1 0 1 1 0 8 0 vmmpekpl 168 51719 0 51645 4 0 4 4 0 8 0 vmmpepl 168 399907 0 397760 198 86 112 120 0 357 10 vmsppl 464 6887 0 6855 6 1 5 5 0 8 0 rwobjpl 56 108513 0 101275 112 6 106 106 0 8 1 pdppl 4096 13784 0 13710 266 184 82 88 0 8 8 pvpl 32 2161353 0 2147411 378 226 152 329 0 265 21 pmappl 248 6887 0 6855 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1193 0 299 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82bfcff0) 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(ffffffff82d48c68) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82d48c68) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000211b8ce0,ffff80000027b600) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge26_untramp() at Xintr_ioapic_edge26_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc intr_handler(ffff8000211b8e40,ffff80000007b080) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff82d48c68) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82d48c68) at __mp_lock+0x122 sys/kern/kern_lock.c:147 reaper(ffff8000211b2aa8) at reaper+0x160 sys/kern/kern_exit.c:454 end trace frame: 0x0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> trace witness_checkorder(fffffd807e8331c0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd807e8331b0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff800021238d68,fffffd807e8331b0,fffffd807e833238,5,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff800021238d68,5) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff800021238d68) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff800021238d68,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff800021238d68,ffff80002e403cc0,ffff80002e403d10) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002e403d90) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002e403d90) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cc468ed6f90, count: -9