##uvm_fault(0xfffffd8069944588, 0x7, 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 111638 1785 0 0x2000002 0x4000001 0 syz-fuzzer witness_checkorder(fffffd8072407958,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd8072407948) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002127b2b8,fffffd8072407948,fffffd80724079d0,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002127b2b8,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002127b2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002127b2b8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002127b2b8,ffff800029599e10,ffff800029599e60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800029599ee0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800029599ee0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71daa1a3df80, 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(0xfffffd8069944588, 0x7, 0, 1) -> e ddb{1}> trace witness_checkorder(fffffd8072407958,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd8072407948) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002127b2b8,fffffd8072407948,fffffd80724079d0,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002127b2b8,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002127b2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002127b2b8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002127b2b8,ffff800029599e10,ffff800029599e60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800029599ee0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800029599ee0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71daa1a3df80, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff800029599bb0 rbx 0xe rdx 0 rcx 0xffff80002127b2b8 rax 0xffff800020d58ff0 r8 0x1 r9 0x1 r10 0x43f6a80ae77cbbbd r11 0x85a5c1d395ff4726 r12 0 r13 0xfffffd8072407958 r14 0xffffffffffffffff r15 0xffff80002127b2b8 rip 0xffffffff81d5339c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800029599b00 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor.2) pid=255652 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff8000212d5540,0xffff8000212d4ab0 process=0xffff8000212710d8 user=0xffff800029594000, vmspace=0xfffffd8069944588 estcpu=30, cpticks=2, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49500 2544 19439 0 2 0 syz-executor.3 40420 218429 60702 0 2 0 syz-executor.6 28672 482749 4050 0 2 0 syz-executor.4 28672 340582 4050 0 3 0x4000080 fsleep syz-executor.4 37915 384100 53939 0 3 0x80 nanoslp syz-executor.0 37915 170749 53939 0 3 0x4000080 fsleep syz-executor.0 89125 411953 6449 0 2 0 syz-executor.1 89125 302023 6449 0 3 0x4000080 pipewr syz-executor.1 89125 232602 6449 0 3 0x4000080 pipewr syz-executor.1 29980 289807 1785 0 2 0x2 syz-executor.5 16719 216607 0 0 3 0x14200 bored sosplice 25631 451652 0 0 3 0x14200 acct acct 56301 308856 0 0 3 0x14280 nfsidl nfsio 37267 92764 0 0 3 0x14280 nfsidl nfsio 55495 438390 0 0 3 0x14280 nfsidl nfsio 61581 354164 0 0 3 0x14280 nfsidl nfsio 54216 461698 0 0 3 0x14280 nfsidl nfsio 19912 84637 0 0 3 0x14280 nfsidl nfsio 81449 226628 0 0 3 0x14280 nfsidl nfsio 44258 260432 0 0 3 0x14280 nfsidl nfsio 38319 155292 0 0 3 0x14280 nfsidl nfsio 10814 114360 0 0 3 0x14280 nfsidl nfsio 74197 111433 0 0 3 0x14280 nfsidl nfsio 26720 503439 0 0 3 0x14280 nfsidl nfsio 64803 424473 0 0 3 0x14280 nfsidl nfsio 62984 172008 0 0 3 0x14280 nfsidl nfsio 36579 12950 0 0 3 0x14280 nfsidl nfsio 61899 278333 0 0 3 0x14280 nfsidl nfsio 8171 374439 0 0 3 0x14280 nfsidl nfsio 49495 108380 0 0 3 0x14280 nfsidl nfsio 38179 261353 0 0 3 0x14280 nfsidl nfsio 96219 242056 0 0 3 0x14280 nfsidl nfsio 63220 165643 1785 0 2 0x2 syz-executor.7 60702 523581 1785 0 3 0x82 nanoslp syz-executor.6 4050 469984 1785 0 3 0x82 nanoslp syz-executor.4 19439 403351 1785 0 3 0x82 nanoslp syz-executor.3 31564 382185 1785 0 3 0x82 nanoslp syz-executor.2 6449 74119 1785 0 2 0x2 syz-executor.1 53939 60284 1785 0 3 0x82 nanoslp syz-executor.0 1785 299185 79477 0 3 0x2000082 wait syz-fuzzer 1785 176473 79477 0 3 0x6000082 thrsleep syz-fuzzer 1785 266599 79477 0 3 0x6000082 thrsleep syz-fuzzer 1785 372223 79477 0 3 0x6000082 thrsleep syz-fuzzer 1785 356337 79477 0 3 0x6000082 wait syz-fuzzer 1785 211836 79477 0 3 0x6000082 wait syz-fuzzer 1785 415194 79477 0 3 0x6000082 thrsleep syz-fuzzer 1785 332447 79477 0 3 0x6000082 wait syz-fuzzer 1785 311957 79477 0 3 0x6000082 wait syz-fuzzer 1785 179094 79477 0 3 0x6000082 thrsleep syz-fuzzer 1785 327893 79477 0 3 0x6000082 thrsleep syz-fuzzer 1785 36616 79477 0 3 0x6000082 wait syz-fuzzer 1785 127415 79477 0 3 0x6000082 wait syz-fuzzer 1785 491824 79477 0 3 0x6000082 wait syz-fuzzer 1785 111638 79477 0 7 0x6000003 syz-fuzzer 1785 501755 79477 0 3 0x6000082 thrsleep syz-fuzzer 79477 227029 68831 0 3 0x10008a sigsusp ksh 68831 255885 6392 0 3 0x9a kqread sshd 4770 305772 1 0 3 0x100083 ttyin getty 6392 348496 1 0 3 0x88 kqread sshd 55792 445682 67443 74 3 0x1100092 bpf pflogd 67443 125049 1 0 3 0x80 netio pflogd 31390 139712 7560 73 3 0x1100090 kqread syslogd 7560 465726 1 0 3 0x100082 netio syslogd 58044 234300 1 0 3 0x100080 kqread resolvd 81805 215163 56591 77 3 0x100092 kqread dhcpleased 61631 68820 56591 77 3 0x100092 kqread dhcpleased 56591 431539 1 0 3 0x80 kqread dhcpleased 23930 146942 0 0 3 0x14200 bored smr 70721 523949 0 0 2 0x14200 zerothread 52898 412101 0 0 3 0x14200 aiodoned aiodoned 20421 78256 0 0 3 0x14200 syncer update 9310 200751 0 0 3 0x14200 cleaner cleaner 35479 477463 0 0 2 0x14200 reaper 75200 77630 0 0 3 0x14200 pgdaemon pagedaemon 35197 416224 0 0 3 0x14200 bored viomb 19129 331211 0 0 3 0x40014200 acpi0 acpi0 20469 278412 0 0 3 0x40014200 idle1 59443 398509 0 0 3 0x14200 bored softnet3 35672 517547 0 0 3 0x14200 bored softnet2 46513 141686 0 0 3 0x14200 bored softnet1 42447 412925 0 0 3 0x14200 bored softnet0 66450 271127 0 0 3 0x14200 bored systqmp 18330 171567 0 0 3 0x14200 bored systq 90072 54578 0 0 3 0x40014200 bored softclock 5948 200829 0 0 3 0x40014200 idle0 1 325410 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10192 6475K 6863K 78643K 13372 0 pcb 13 10K 12K 78643K 145 0 rtable 243 7K 7K 78643K 432 0 pf 32 9K 10K 78643K 119 0 ifaddr 45 15K 16K 78643K 86 0 ifgroup 55 2K 2K 78643K 161 0 sysctl 0 0K 0K 78643K 3 0 counters 60 35K 36K 78643K 124 0 ioctlops 0 0K 4K 78643K 1610 0 iov 0 0K 24K 78643K 98 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1453 91K 91K 78643K 2247 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 14 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 111 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 89K 78643K 1950 0 sigio 0 0K 0K 78643K 145 0 proc 70 91K 115K 78643K 679 0 subproc 104 6K 6K 78643K 117 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 67 0 in_multi 99 7K 7K 78643K 117 0 ether_multi 1 0K 0K 78643K 4 0 mrt 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 635 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 380 91K 92K 78643K 22147 0 UVM aobj 37 2K 2K 78643K 37 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 48 0 NDP 12 0K 1K 78643K 62 0 temp 76 5920K 6064K 78643K 11180 0 kqueue 12 18K 26K 78643K 143 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 120 128 0 125 2 1 1 2 0 8 0 rtentry 112 125 0 12 4 0 4 4 0 8 0 unpcb 144 1548 0 1533 26 25 1 6 0 8 0 syncache 304 16 0 16 5 5 0 1 0 8 0 tcpqe 32 214 0 214 2 2 0 1 0 8 0 tcpcb 808 356 0 352 18 17 1 8 0 8 0 arp 120 21 0 2 1 0 1 1 0 8 0 inpcb 368 2559 0 2546 41 34 7 11 0 8 5 nd6 136 29 0 3 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1256 17 0 17 4 4 0 1 0 8 0 pffrag 232 111 0 110 1 0 1 1 0 482 0 pffrnode 88 111 0 110 1 0 1 1 0 8 0 pffrent 40 230 0 229 1 0 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 84 0 65 1 0 1 1 0 8 0 pfstkey 128 84 0 65 1 0 1 1 0 8 0 pfstate 376 84 0 65 3 1 2 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 256 510 0 44 30 0 30 30 0 8 0 art_table 32 511 0 44 4 0 4 4 0 8 0 art_node 16 124 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 2 2 0 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 109 0 99 1 0 1 1 0 8 0 shmpl 112 34 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4188 0 2721 92 0 92 92 0 8 0 ffsino 272 4188 0 2721 99 0 99 99 0 8 0 nchpl 144 7065 0 6565 64 41 23 64 0 8 0 uvmvnodes 80 4927 0 0 101 0 101 101 0 8 0 vnodes 216 4927 0 0 274 0 274 274 0 8 0 namei 1024 24046 0 24046 4 3 1 2 0 8 1 percpumem 16 75 0 32 1 0 1 1 0 8 0 vmpool 696 4 0 4 1 1 0 1 0 8 0 kstatmem 264 88 0 64 2 0 2 2 0 8 0 scxspl 216 29297 0 29297 14 11 3 8 1 8 3 plimitpl 152 340 0 323 1 0 1 1 0 8 0 sigapl 424 2293 0 2224 10 2 8 8 0 8 0 futexpl 64 15313 0 15311 3 2 1 1 0 8 0 knotepl 120 371 0 0 11 0 11 11 0 8 0 kqueuepl 216 334 0 326 9 8 1 5 0 8 0 pipepl 320 429 0 399 14 11 3 8 0 8 0 fdescpl 496 2254 0 2224 5 1 4 5 0 8 0 filepl 152 15201 0 14921 46 34 12 19 0 8 1 lockfpl 104 1685 0 1682 6 4 2 2 0 8 1 lockfspl 48 422 0 419 1 0 1 1 0 8 0 sessionpl 144 25 0 8 1 0 1 1 0 8 0 pgrppl 48 27 0 10 1 0 1 1 0 8 0 ucredpl 104 1910 0 1898 1 0 1 1 0 8 0 zombiepl 144 2226 0 2224 1 0 1 1 0 8 0 processpl 1072 2293 0 2224 5 0 5 5 0 8 0 procpl 680 5801 0 5712 11 2 9 9 0 8 0 sosppl 168 6 0 6 1 1 0 1 0 8 0 sockpl 488 4243 0 4216 107 95 12 26 0 8 8 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl16k 16384 12 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 15 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 283 0 0 35 0 35 35 0 8 0 mtagpl 96 312 0 0 8 0 8 8 0 8 0 mbufpl 256 567 0 0 32 0 32 32 0 8 0 bufpl 288 9029 0 2702 453 0 453 453 0 8 0 anonpl 24 388426 0 374581 172 77 95 161 0 186 0 amapchunkpl 152 70996 0 70074 75 35 40 65 0 158 4 amappl16 200 9363 0 8954 54 31 23 34 0 8 1 amappl15 192 77 0 77 1 1 0 1 0 8 0 amappl14 184 200 0 184 2 1 1 2 0 8 0 amappl13 176 23 0 22 1 0 1 1 0 8 0 amappl12 168 2943 0 2914 3 1 2 2 0 8 0 amappl11 160 94 0 79 1 0 1 1 0 8 0 amappl10 152 34 0 24 1 0 1 1 0 8 0 amappl9 144 234 0 232 1 0 1 1 0 8 0 amappl8 136 262 0 182 3 0 3 3 0 8 0 amappl7 128 99 0 88 2 0 2 2 0 8 0 amappl6 120 271 0 248 2 1 1 2 0 8 0 amappl5 112 265 0 253 1 0 1 1 0 8 0 amappl4 104 632 0 587 3 1 2 3 0 8 0 amappl3 96 14049 0 13959 6 3 3 4 0 8 0 amappl2 88 2571 0 2501 3 1 2 3 0 8 0 amappl1 80 16442 0 15875 25 12 13 23 0 8 0 amappl 88 21382 0 21132 9 2 7 7 0 92 1 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 36 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2258 0 2228 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2258 0 2228 1 0 1 1 0 8 0 vmmpekpl 168 22968 0 22908 3 0 3 3 0 8 0 vmmpepl 168 155223 0 152804 159 49 110 121 0 357 4 vmsppl 464 2257 0 2228 5 1 4 5 0 8 0 rwobjpl 56 50398 0 43892 94 2 92 92 0 8 0 pdppl 4096 4523 0 4456 173 104 69 81 0 8 2 pvpl 32 919656 0 899597 367 134 233 365 0 265 60 pmappl 248 2257 0 2228 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1010 0 167 25 0 25 25 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c26ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 kd_curproc sys/dev/kcov.c:590 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 sys/dev/kcov.c:158 __mp_lock(ffffffff82c85f30) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c85f30) at __mp_lock+0x133 sys/kern/kern_lock.c:147 ktrstruct(ffff80002121ba90,ffffffff8283f8ca,ffff80002c9e0f30,10) at ktrstruct+0xda sys/kern/kern_ktrace.c:307 sys_kevent(ffff80002121ba90,ffff80002c9e0ff0,ffff80002c9e1040) at sys_kevent+0x435 sys/kern/kern_event.c:1001 syscall(ffff80002c9e10c0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002c9e10c0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2b28d2e80, count: 6 ddb{0}> trace x86_ipi_db(ffffffff82c26ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 kd_curproc sys/dev/kcov.c:590 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 sys/dev/kcov.c:158 __mp_lock(ffffffff82c85f30) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c85f30) at __mp_lock+0x133 sys/kern/kern_lock.c:147 ktrstruct(ffff80002121ba90,ffffffff8283f8ca,ffff80002c9e0f30,10) at ktrstruct+0xda sys/kern/kern_ktrace.c:307 sys_kevent(ffff80002121ba90,ffff80002c9e0ff0,ffff80002c9e1040) at sys_kevent+0x435 sys/kern/kern_event.c:1001 syscall(ffff80002c9e10c0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002c9e10c0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2b28d2e80, count: -9 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx witness_checkorder(fffffd8072407958,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd8072407948) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002127b2b8,fffffd8072407948,fffffd80724079d0,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002127b2b8,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002127b2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002127b2b8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002127b2b8,ffff800029599e10,ffff800029599e60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800029599ee0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800029599ee0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71daa1a3df80, count: 6 ddb{1}> trace witness_checkorder(fffffd8072407958,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd8072407948) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002127b2b8,fffffd8072407948,fffffd80724079d0,6,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002127b2b8,6) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002127b2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002127b2b8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002127b2b8,ffff800029599e10,ffff800029599e60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800029599ee0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800029599ee0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71daa1a3df80, count: -9