uvm_fault(0xfffffd8067bc11f0, 0x8, 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 253838 64636 0 0x12 0x8 0 sshd witness_checkorder(fffffd806f21be68,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f21be58) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002125c2b8,fffffd806f21be58,fffffd806f21bee0,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002125c2b8,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002125c2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002125c2b8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002125c2b8,ffff800022cff9a0,ffff800022cff9f0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800022cffa70) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800022cffa70) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76b45a372a30, 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(0xfffffd8067bc11f0, 0x8, 0, 1) -> e ddb{1}> trace witness_checkorder(fffffd806f21be68,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f21be58) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002125c2b8,fffffd806f21be58,fffffd806f21bee0,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002125c2b8,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002125c2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002125c2b8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002125c2b8,ffff800022cff9a0,ffff800022cff9f0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800022cffa70) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800022cffa70) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76b45a372a30, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff800022cff740 rbx 0xe rdx 0 rcx 0xffff80002125c2b8 rax 0xffff800020d58ff0 r8 0x1 r9 0x1 r10 0x31fe19ea53108900 r11 0x5b0f0d359af18941 r12 0 r13 0xfffffd806f21be68 r14 0 r15 0xffff80002125c2b8 rip 0xffffffff81a26f5c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800022cff690 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor.3) pid=418649 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff80002125d000,0xffff80002125d2b8 process=0xffff800026b5fab8 user=0xffff800022cfa000, vmspace=0xfffffd8067bc11f0 estcpu=31, cpticks=3, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 72979 462837 1418 32767 2 0x10 syz-executor.2 36918 398042 13730 32767 2 0x10 syz-executor.5 36918 54440 13730 32767 2 0x4000010 syz-executor.5 36918 42345 13730 32767 3 0x4000090 fsleep syz-executor.5 36918 103324 13730 32767 3 0x4000090 fsleep syz-executor.5 13813 175362 88474 32767 2 0x10 syz-executor.6 13813 287777 88474 32767 3 0x4000090 fsleep syz-executor.6 13813 315262 88474 32767 3 0x4000090 fsleep syz-executor.6 13813 483573 88474 32767 2 0x4000010 syz-executor.6 13813 52090 88474 32767 2 0x4000010 syz-executor.6 13813 93595 88474 32767 2 0x4000010 syz-executor.6 34803 247956 52508 32767 2 0x10 syz-executor.4 34803 67958 52508 32767 3 0x4000090 fsleep syz-executor.4 34803 359358 52508 32767 2 0x4000010 syz-executor.4 83447 103112 0 0 3 0x14200 bored sosplice 13730 309531 64615 32767 3 0x90 nanoslp syz-executor.5 88474 134408 29780 32767 3 0x90 nanoslp syz-executor.6 64615 111789 44639 0 3 0x82 wait syz-executor.5 83802 172588 47947 32767 2 0x10 syz-executor.7 47947 399663 44639 0 3 0x82 wait syz-executor.7 29780 438114 44639 0 3 0x82 wait syz-executor.6 52508 414130 65079 32767 3 0x90 nanoslp syz-executor.4 1418 98038 74223 32767 3 0x90 nanoslp syz-executor.2 65079 327714 44639 0 3 0x82 wait syz-executor.4 73222 298492 59073 32767 3 0x90 nanoslp syz-executor.1 49950 363629 11794 32767 3 0x90 nanoslp syz-executor.3 74223 204404 44639 0 3 0x82 wait syz-executor.2 59073 326248 44639 0 3 0x82 wait syz-executor.1 86088 108222 33266 32767 2 0x10 syz-executor.0 11794 510384 44639 0 3 0x82 wait syz-executor.3 33266 167217 44639 0 3 0x82 wait syz-executor.0 44639 3680 48457 0 3 0x2000082 wait syz-fuzzer 44639 87298 48457 0 3 0x6000082 nanoslp syz-fuzzer 44639 236816 48457 0 3 0x6000082 wait syz-fuzzer 44639 445111 48457 0 3 0x6000082 wait syz-fuzzer 44639 369079 48457 0 3 0x6000082 wait syz-fuzzer 44639 149806 48457 0 3 0x6000082 wait syz-fuzzer 44639 340411 48457 0 3 0x6000082 thrsleep syz-fuzzer 44639 335939 48457 0 3 0x6000082 thrsleep syz-fuzzer 44639 449137 48457 0 3 0x6000082 thrsleep syz-fuzzer 44639 310125 48457 0 3 0x6000082 wait syz-fuzzer 44639 329204 48457 0 3 0x6000082 thrsleep syz-fuzzer 44639 339703 48457 0 3 0x6000082 wait syz-fuzzer 44639 482052 48457 0 3 0x6000082 wait syz-fuzzer 44639 414781 48457 0 3 0x6000082 kqread syz-fuzzer 44639 267187 48457 0 3 0x6000082 thrsleep syz-fuzzer 44639 385000 48457 0 3 0x6000082 thrsleep syz-fuzzer 48457 262854 64636 0 3 0x10008a sigsusp ksh 64636 253838 50597 0 7 0x1a sshd 3937 208189 1 0 3 0x100083 ttyin getty 50597 441840 1 0 3 0x88 kqread sshd 24226 438643 55077 73 3 0x1100090 kqread syslogd 55077 59536 1 0 3 0x100082 netio syslogd 7164 25610 1 0 3 0x100080 kqread resolvd 91404 409763 30114 77 3 0x100092 kqread dhcpleased 54767 76084 30114 77 3 0x100092 kqread dhcpleased 30114 503793 1 0 3 0x80 kqread dhcpleased 36475 331545 0 0 3 0x14200 bored smr 86291 217329 0 0 2 0x14200 zerothread 29049 298177 0 0 3 0x14200 aiodoned aiodoned 88099 461251 0 0 3 0x14200 syncer update 35421 169557 0 0 3 0x14200 cleaner cleaner 10178 396979 0 0 2 0x14200 reaper 99385 393010 0 0 3 0x14200 pgdaemon pagedaemon 88499 291445 0 0 3 0x14200 bored viomb 96585 103670 0 0 3 0x40014200 acpi0 acpi0 3035 429176 0 0 3 0x40014200 idle1 56790 136832 0 0 3 0x14200 bored softnet3 55073 482842 0 0 3 0x14200 bored softnet2 95280 163466 0 0 3 0x14200 bored softnet1 14334 143300 0 0 3 0x14200 bored softnet0 87805 303122 0 0 3 0x14200 bored systqmp 78462 221687 0 0 3 0x14200 bored systq 70659 73111 0 0 3 0x40014200 bored softclock 83058 77451 0 0 3 0x40014200 idle0 1 384081 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 86088 (syz-executor.0) thread 0xffff800021201010 (108222) exclusive rrwlock inode r = 0 (0xfffffd807be66d58) #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 (0xfffffd806d768b48) #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 10187 6409K 6420K 78643K 11265 0 pcb 13 10K 12K 78643K 15 0 rtable 238 6K 6K 78643K 354 0 pf 29 8K 8K 78643K 29 0 ifaddr 44 15K 15K 78643K 46 0 ifgroup 50 2K 2K 78643K 50 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 29 0 iov 0 0K 12K 78643K 219 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1278 80K 80K 78643K 1437 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 14 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 144 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 23 85K 109K 78643K 1311 0 sigio 0 0K 0K 78643K 3 0 proc 56 78K 103K 78643K 555 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 32 0 in_multi 99 7K 7K 78643K 111 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 61 281K 281K 78643K 61 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 346 85K 100K 78643K 15042 0 UVM aobj 131 4K 5K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 38 0 NDP 11 0K 2K 78643K 27 0 temp 74 5920K 5990K 78643K 6785 0 kqueue 12 18K 24K 78643K 204 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 42 0 39 1 0 1 1 0 8 0 rtentry 112 113 0 1 4 0 4 4 0 8 0 unpcb 144 3080 0 3059 18 9 9 10 0 8 8 syncache 304 19 0 19 2 2 0 1 0 8 0 tcpqe 32 412 0 412 4 4 0 1 0 8 0 tcpcb 808 376 0 366 20 17 3 15 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 ipq 40 4 0 2 1 0 1 1 0 8 0 ipqe 40 10 0 4 1 0 1 1 0 8 0 inpcb 368 570 0 557 19 16 3 14 0 8 0 nd6 136 26 0 0 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 256 461 0 0 29 0 29 29 0 8 0 art_table 32 462 0 0 4 0 4 4 0 8 0 art_node 16 112 0 10 1 0 1 1 0 8 0 semapl 112 142 0 132 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2956 0 1515 91 0 91 91 0 8 0 ffsino 272 2956 0 1515 97 0 97 97 0 8 0 nchpl 144 4741 0 3061 63 0 63 63 0 8 0 uvmvnodes 80 3069 0 0 63 0 63 63 0 8 0 vnodes 216 3069 0 0 171 0 171 171 0 8 0 namei 1024 15990 0 15989 4 3 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 15631 0 15631 10 9 1 8 1 8 1 plimitpl 152 240 0 216 3 2 1 2 0 8 0 sigapl 424 1605 0 1552 8 1 7 7 0 8 0 futexpl 64 10351 0 10346 2 1 1 1 0 8 0 knotepl 120 121 0 0 4 0 4 4 0 8 0 kqueuepl 216 331 0 321 3 2 1 3 0 8 0 pipepl 320 414 0 321 14 6 8 9 0 8 0 fdescpl 496 1587 0 1553 6 0 6 6 0 8 0 filepl 152 10347 0 9971 28 10 18 19 0 8 3 lockfpl 104 107 0 104 1 0 1 1 0 8 0 lockfspl 48 45 0 42 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 104 1071 0 1053 1 0 1 1 0 8 0 zombiepl 144 1554 0 1552 1 0 1 1 0 8 0 processpl 1072 1605 0 1552 4 0 4 4 0 8 0 procpl 680 3770 0 3691 10 2 8 8 0 8 1 sosppl 168 21 0 21 3 2 1 1 0 8 1 sockpl 488 3708 0 3671 101 78 23 34 0 8 17 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 359 0 0 45 0 45 45 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 374 0 0 24 0 24 24 0 8 0 bufpl 288 6187 0 148 432 0 432 432 0 8 0 anonpl 24 315452 0 304167 108 20 88 93 0 186 13 amapchunkpl 152 49348 0 48425 51 7 44 49 0 158 5 amappl16 200 8155 0 7896 38 15 23 27 0 8 8 amappl15 192 13 0 13 1 1 0 1 0 8 0 amappl14 184 179 0 166 2 1 1 2 0 8 0 amappl13 176 18 0 17 1 0 1 1 0 8 0 amappl12 168 2223 0 2187 2 0 2 2 0 8 0 amappl11 160 59 0 48 1 0 1 1 0 8 0 amappl10 152 38 0 25 1 0 1 1 0 8 0 amappl9 144 326 0 325 1 0 1 1 0 8 0 amappl8 136 254 0 192 4 1 3 3 0 8 0 amappl7 128 79 0 67 2 1 1 2 0 8 0 amappl6 120 243 0 228 1 0 1 1 0 8 0 amappl5 112 198 0 189 1 0 1 1 0 8 0 amappl4 104 629 0 591 2 0 2 2 0 8 0 amappl3 96 9409 0 9318 3 0 3 3 0 8 0 amappl2 88 1861 0 1791 3 1 2 3 0 8 0 amappl1 80 13786 0 13259 22 10 12 22 0 8 0 amappl 88 14493 0 14248 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 1587 0 1553 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1587 0 1553 1 0 1 1 0 8 0 vmmpekpl 168 17416 0 17344 4 0 4 4 0 8 0 vmmpepl 168 112816 0 110536 131 21 110 122 0 357 3 vmsppl 464 1586 0 1553 5 0 5 5 0 8 0 rwobjpl 56 38464 0 33988 69 3 66 66 0 8 0 pdppl 4096 3182 0 3106 136 54 82 88 0 8 6 pvpl 32 708700 0 691415 335 40 295 334 0 265 149 pmappl 248 1586 0 1553 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 922 0 94 24 0 24 24 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82bbdff0) 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(ffffffff82d841f0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82d841f0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002121ed90,ffff80000027b500) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 witness_checkorder(fffffd806f21b5f8,9,0) at witness_checkorder+0x115 sys/kern/subr_witness.c:770 mtx_enter(fffffd806f21b5e8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 kqueue_scan(ffff80002121f150,4,ffff80002121f050,0,ffff8000211ee010,ffff80002121f2cc) at kqueue_scan+0x1ed sys/kern/kern_event.c:1376 doppoll(ffff8000211ee010,b0799f58a80,4,0,ffff80002121f344,ffff80002121f410) at doppoll+0x2a1 sys/kern/sys_generic.c:992 sys_ppoll(ffff8000211ee010,ffff80002121f3c0,ffff80002121f410) at sys_ppoll+0x137 sys/kern/sys_generic.c:916 syscall(ffff80002121f490) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002121f490) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71e56645ba70, count: 1 ddb{0}> trace x86_ipi_db(ffffffff82bbdff0) 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(ffffffff82d841f0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82d841f0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002121ed90,ffff80000027b500) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 witness_checkorder(fffffd806f21b5f8,9,0) at witness_checkorder+0x115 sys/kern/subr_witness.c:770 mtx_enter(fffffd806f21b5e8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 kqueue_scan(ffff80002121f150,4,ffff80002121f050,0,ffff8000211ee010,ffff80002121f2cc) at kqueue_scan+0x1ed sys/kern/kern_event.c:1376 doppoll(ffff8000211ee010,b0799f58a80,4,0,ffff80002121f344,ffff80002121f410) at doppoll+0x2a1 sys/kern/sys_generic.c:992 sys_ppoll(ffff8000211ee010,ffff80002121f3c0,ffff80002121f410) at sys_ppoll+0x137 sys/kern/sys_generic.c:916 syscall(ffff80002121f490) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002121f490) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71e56645ba70, count: -14 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx witness_checkorder(fffffd806f21be68,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f21be58) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002125c2b8,fffffd806f21be58,fffffd806f21bee0,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002125c2b8,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002125c2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002125c2b8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002125c2b8,ffff800022cff9a0,ffff800022cff9f0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800022cffa70) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800022cffa70) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76b45a372a30, count: 6 ddb{1}> trace witness_checkorder(fffffd806f21be68,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f21be58) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002125c2b8,fffffd806f21be58,fffffd806f21bee0,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002125c2b8,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002125c2b8) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002125c2b8,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002125c2b8,ffff800022cff9a0,ffff800022cff9f0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800022cffa70) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800022cffa70) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76b45a372a30, count: -9