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(fffffd806f2bb6d0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f2bb6c0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000212a72a0,fffffd806f2bb6c0,fffffd806f2bb748,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212a72a0,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212a72a0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212a72a0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212a72a0,ffff8000212913d0,ffff800021291420) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212914a0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212914a0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f5a466d0fe0, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff800021291170 rbx 0xe rdx 0 rcx 0xffff8000212a72a0 rax 0xffff800020d58ff0 r8 0x1 r9 0x1 r10 0x35b56c0db67b55dd r11 0x38fc7a82972ce76c r12 0 r13 0xfffffd806f2bb6d0 r14 0x3ff5555555555555 r15 0xffff8000212a72a0 rip 0xffffffff8146926c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000212910c0 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor.1) pid=82212 stat=onproc flags process=1018 proc=2000 pri=0, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000212a62b0,0xffff8000211f42d0 process=0xffff8000ffff8c98 user=0xffff80002128c000, vmspace=0xfffffd807948a1e8 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 68773 188570 39693 32767 2 0x10 syz-executor.6 86583 353391 32071 32767 2 0x10 syz-executor.7 86583 512969 32071 32767 2 0x4000010 syz-executor.7 86583 390072 32071 32767 3 0x4000090 fsleep syz-executor.7 43353 82487 25080 32767 2 0x10 syz-executor.4 43353 343218 25080 32767 3 0x4000090 fsleep syz-executor.4 13038 388030 1436 32767 3 0x90 nanoslp syz-executor.1 1436 184474 90531 0 3 0x82 wait syz-executor.1 34125 111353 85320 32767 3 0x10 biowait syz-executor.0 85320 434629 90531 0 3 0x82 wait syz-executor.0 38670 512717 3533 32767 3 0x10 getblk syz-executor.5 3533 251356 90531 0 3 0x82 wait syz-executor.5 25591 411160 0 0 3 0x14200 bored sosplice 32071 244378 22857 32767 3 0x90 nanoslp syz-executor.7 25080 413528 29460 32767 3 0x90 nanoslp syz-executor.4 39693 371270 172 32767 3 0x90 nanoslp syz-executor.6 22857 89458 90531 0 3 0x82 wait syz-executor.7 172 365109 90531 0 3 0x82 wait syz-executor.6 29460 68705 90531 0 3 0x82 wait syz-executor.4 83628 381103 95559 32767 3 0x10 biowait syz-executor.3 95559 180169 90531 0 3 0x82 wait syz-executor.3 26015 402749 21044 32767 3 0x10 getblk syz-executor.2 21044 186880 90531 0 3 0x82 wait syz-executor.2 90531 128330 38282 0 3 0x2000082 thrsleep syz-fuzzer 90531 284691 38282 0 3 0x6000082 nanoslp syz-fuzzer 90531 156303 38282 0 3 0x6000082 wait syz-fuzzer 90531 14746 38282 0 3 0x6000082 wait syz-fuzzer 90531 331082 38282 0 3 0x6000082 wait syz-fuzzer 90531 471967 38282 0 3 0x6000082 wait syz-fuzzer 90531 251266 38282 0 3 0x6000082 thrsleep syz-fuzzer 90531 89945 38282 0 3 0x6000082 wait syz-fuzzer 90531 436674 38282 0 3 0x6000082 wait syz-fuzzer 90531 475095 38282 0 3 0x6000082 thrsleep syz-fuzzer 90531 484000 38282 0 3 0x6000082 thrsleep syz-fuzzer 90531 336213 38282 0 3 0x6000082 wait syz-fuzzer 90531 354231 38282 0 3 0x6000082 wait syz-fuzzer 90531 36439 38282 0 3 0x6000082 thrsleep syz-fuzzer 90531 203319 38282 0 3 0x6000082 thrsleep syz-fuzzer 90531 500499 38282 0 3 0x6000082 kqread syz-fuzzer 38282 19744 46116 0 3 0x10008a sigsusp ksh 46116 239585 36304 0 3 0x9a kqread sshd 41279 273348 1 0 3 0x100083 ttyin getty 36304 352983 1 0 3 0x88 kqread sshd 8692 384960 65999 73 3 0x1100090 kqread syslogd 65999 502278 1 0 3 0x100082 netio syslogd 33387 374138 1 0 3 0x100080 kqread resolvd 95393 373422 57621 77 3 0x100092 kqread dhcpleased 38463 148465 57621 77 3 0x100092 kqread dhcpleased 57621 9922 1 0 3 0x80 kqread dhcpleased 9974 326978 0 0 3 0x14200 bored smr 39295 137026 0 0 2 0x14200 zerothread 23272 391355 0 0 3 0x14200 aiodoned aiodoned 93009 107617 0 0 3 0x14200 syncer update 17023 87622 0 0 3 0x14200 cleaner cleaner 25248 105458 0 0 2 0x14200 reaper 49901 247157 0 0 3 0x14200 pgdaemon pagedaemon 10659 102176 0 0 3 0x14200 bored viomb 35384 354717 0 0 3 0x40014200 acpi0 acpi0 98532 421874 0 0 3 0x40014200 idle1 96205 37374 0 0 3 0x14200 bored softnet3 86167 410120 0 0 3 0x14200 bored softnet2 3625 190404 0 0 3 0x14200 bored softnet1 69815 156907 0 0 7 0x14200 softnet0 72690 215002 0 0 3 0x14200 bored systqmp 81392 416933 0 0 3 0x14200 bored systq 15047 185050 0 0 3 0x40014200 bored softclock 5997 151472 0 0 3 0x40014200 idle0 1 214688 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 34125 (syz-executor.0) thread 0xffff8000212a6ff8 (111353) exclusive rrwlock inode r = 0 (0xfffffd80793a6c58) #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 (0xfffffd805f37fe68) #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 Process 38670 (syz-executor.5) thread 0xffff8000212257e8 (512717) exclusive rrwlock inode r = 0 (0xfffffd80793a6e78) #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 (0xfffffd805f37fa28) #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 83628 (syz-executor.3) thread 0xffff80002121a2c8 (381103) exclusive rrwlock inode r = 0 (0xfffffd80793a65f8) #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 (0xfffffd80711192c0) #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 26015 (syz-executor.2) thread 0xffff80002121bd58 (402749) exclusive rrwlock inode r = 0 (0xfffffd80793a6b48) #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 vn_closefile+0xca vn_close sys/kern/vfs_vnops.c:292 [inline] #5 vn_closefile+0xca sys/kern/vfs_vnops.c:609 #6 fdrop+0xcb sys/kern/kern_descrip.c:1274 #7 closef+0x120 sys/kern/kern_descrip.c:1258 #8 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x606 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 Process 69815 (softnet0) thread 0xffff800021168000 (156907) exclusive rwlock netlock r = 0 (0xffffffff82b88c40) #0 witness_lock+0x447 #1 if_netisr+0x1f sys/net/if.c:1046 #2 taskq_thread+0xe5 sys/kern/kern_task.c:450 #3 proc_trampoline+0x1c shared rwlock softnet0 r = 0 (0xffff80000002d070) #0 witness_lock+0x447 #1 taskq_thread+0xca sys/kern/kern_task.c:446 #2 proc_trampoline+0x1c ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10203 6411K 6420K 78643K 11300 0 pcb 13 10K 12K 78643K 15 0 rtable 236 6K 7K 78643K 8974 0 pf 29 8K 8K 78643K 41 0 ifaddr 44 15K 15K 78643K 72 0 ifgroup 50 2K 2K 78643K 74 0 sysctl 3 1K 1K 78643K 3 0 counters 60 35K 35K 78643K 72 0 ioctlops 0 0K 2K 78643K 73 0 iov 0 0K 34K 78643K 540 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 2295 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 76 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1125 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 109K 78643K 4735 0 sigio 0 0K 0K 78643K 68 0 proc 56 78K 103K 78643K 834 0 subproc 104 6K 6K 78643K 182 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 256 0 in_multi 99 7K 7K 78643K 197 0 ether_multi 1 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 157 705K 705K 78643K 157 0 exec 0 0K 1K 78643K 1381 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 385 89K 93K 78643K 48027 0 UVM aobj 131 4K 4K 78643K 152 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 142 0 NDP 11 0K 2K 78643K 45 0 temp 74 5920K 6048K 78643K 14772 0 kqueue 12 18K 26K 78643K 385 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 3521 0 3518 21 20 1 5 0 8 0 rtentry 112 181 0 70 4 0 4 4 0 8 0 unpcb 144 3086 0 3073 26 25 1 6 0 8 0 syncache 304 55 0 55 8 8 0 1 0 8 0 tcpqe 32 250 0 250 7 7 0 1 0 8 0 tcpcb 808 1761 0 1745 48 46 2 11 0 8 0 arp 120 31 0 13 1 0 1 1 0 8 0 ipq 40 10 0 10 2 2 0 1 0 8 0 ipqe 40 134 0 134 2 2 0 1 0 8 0 inpcb 368 3017 0 2994 61 58 3 13 0 8 0 nd6 136 45 0 20 1 0 1 1 0 8 0 kcovpl 48 14 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 734 0 276 29 0 29 29 0 8 0 art_table 32 735 0 276 4 0 4 4 0 8 0 art_node 16 180 0 79 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 1 1 0 1 0 8 0 semapl 112 1123 0 1113 1 0 1 1 0 8 0 shmpl 112 149 0 21 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 7464 0 6025 91 0 91 91 0 8 0 ffsino 272 7465 0 6025 97 0 97 97 0 8 0 nchpl 144 13501 0 11861 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 44394 0 44392 3 2 1 2 0 8 0 percpumem 16 49 0 6 1 0 1 1 0 8 0 kstatmem 264 34 0 12 2 0 2 2 0 8 0 scxspl 216 43323 0 43321 20 16 4 8 1 8 3 plimitpl 152 588 0 564 9 8 1 2 0 8 0 sigapl 424 5017 0 4966 7 0 7 7 0 8 0 futexpl 64 35333 0 35331 1 0 1 1 0 8 0 knotepl 120 362 0 0 10 0 10 10 0 8 0 kqueuepl 216 1073 0 1065 24 19 5 5 0 8 4 pipepl 320 1180 0 1152 38 35 3 8 0 8 0 fdescpl 496 4999 0 4966 7 2 5 6 0 8 0 filepl 152 31770 0 31531 58 45 13 20 0 8 3 lockfpl 104 584 0 581 1 0 1 1 0 8 0 lockfspl 48 173 0 170 1 0 1 1 0 8 0 sessionpl 144 29 0 13 1 0 1 1 0 8 0 pgrppl 48 445 0 429 1 0 1 1 0 8 0 ucredpl 104 5148 0 5130 1 0 1 1 0 8 0 zombiepl 144 4967 0 4966 1 0 1 1 0 8 0 processpl 1072 5017 0 4966 4 0 4 4 0 8 0 procpl 680 13062 0 12992 16 8 8 8 0 8 1 sosppl 168 46 0 44 5 4 1 1 0 8 0 sockpl 488 9766 0 9727 194 188 6 30 0 8 0 mcl64k 65536 18 0 0 3 1 2 3 0 8 0 mcl16k 16384 13 0 0 2 0 2 2 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 256 0 0 31 4 27 31 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 7566 0 0 469 0 469 469 0 8 0 bufpl 288 11067 0 4741 453 0 453 453 0 8 0 anonpl 24 627185 0 616326 154 59 95 98 0 186 16 amapchunkpl 152 152374 0 151540 73 29 44 47 0 158 9 amappl16 200 14738 0 14447 65 48 17 29 0 8 0 amappl15 192 32 0 32 2 2 0 1 0 8 0 amappl14 184 180 0 166 2 1 1 2 0 8 0 amappl13 176 55 0 55 3 3 0 1 0 8 0 amappl12 168 5756 0 5715 3 0 3 3 0 8 0 amappl11 160 51 0 40 1 0 1 1 0 8 0 amappl10 152 38 0 27 2 1 1 1 0 8 0 amappl9 144 239 0 238 1 0 1 1 0 8 0 amappl8 136 425 0 316 4 0 4 4 0 8 0 amappl7 128 103 0 90 2 0 2 2 0 8 0 amappl6 120 325 0 303 1 0 1 1 0 8 0 amappl5 112 258 0 249 1 0 1 1 0 8 0 amappl4 104 670 0 633 2 0 2 2 0 8 0 amappl3 96 30169 0 30080 9 5 4 4 0 8 1 amappl2 88 5506 0 5434 3 1 2 3 0 8 0 amappl1 80 25881 0 25356 22 9 13 22 0 8 0 amappl 88 47322 0 47087 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 72 151 0 21 3 0 3 3 0 8 0 uaddrrnd 24 4999 0 4966 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4999 0 4966 1 0 1 1 0 8 0 vmmpekpl 168 41416 0 41348 4 0 4 4 0 8 0 vmmpepl 168 306624 0 304313 153 40 113 120 0 357 4 vmsppl 464 4998 0 4966 7 2 5 6 0 8 0 rwobjpl 56 87066 0 79668 115 9 106 109 0 8 0 pdppl 4096 10006 0 9932 276 196 80 90 0 8 6 pvpl 32 1602656 0 1585845 403 206 197 336 0 265 45 pmappl 248 4998 0 4966 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1592 0 317 37 0 37 37 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82c1fff0) 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+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 __mp_lock(ffffffff82c97058) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c97058) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff800021187680,ffff80000007b080) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d udp_sbappend(fffffd806f042730,fffffd8069b57b00,fffffd8069b57be4,0,14,fffffd8069b57bf8,dfc97bbe7b13f684,fffffd806f042730) at udp_sbappend+0x3b8 sys/netinet/udp_usrreq.c:682 udp_input(ffff800021187a18,ffff800021187a24,11,2) at udp_input+0x1318 sys/netinet/udp_usrreq.c:617 ip_deliver(ffff800021187a18,ffff800021187a24,11,2) at ip_deliver+0x363 sys/netinet/ip_input.c:691 ipintr() at ipintr+0x8d sys/netinet/ip_input.c:263 if_netisr(0) at if_netisr+0xfa sys/net/if.c:1063 taskq_thread(ffff80000002d000) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> trace witness_checkorder(fffffd806f2bb6d0,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd806f2bb6c0) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000212a72a0,fffffd806f2bb6c0,fffffd806f2bb748,4,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212a72a0,4) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212a72a0) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212a72a0,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212a72a0,ffff8000212913d0,ffff800021291420) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000212914a0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212914a0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f5a466d0fe0, count: -9