kernel: protection fault trap, code=0 Stopped at witness_checkorder+0x4f5: movl 0x10(%r14),%ecx 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(fffffd806ef59370,9,0) at witness_checkorder+0x4f5 witness_lock_order_check sys/kern/subr_witness.c:2442 [inline] witness_checkorder(fffffd806ef59370,9,0) at witness_checkorder+0x4f5 sys/kern/subr_witness.c:890 mtx_enter(fffffd806ef59360) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000212f7000,fffffd806ef59360,fffffd806ef593e8,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212f7000,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212f7000) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212f7000,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212f7000,ffff80002956d4b0,ffff80002956d500) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002956d580) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002956d580) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70d869abc270, count: -9 ddb{1}> show registers rdi 0xffffffff rsi 0xffffffff rbp 0xffff80002956d250 rbx 0xffffffff rdx 0 rcx 0xc rax 0xfffffd80031ef000 r8 0x1 r9 0x1 r10 0x2ebd3d6fb12614f6 r11 0x8faf0dae7bd02c82 r12 0xfffffd80031c7300 r13 0xfffffd806ef59370 r14 0xdeafbeaddeafbead r15 0xfffffd80039b50c0 rip 0xffffffff81f47f95 witness_checkorder+0x4f5 cs 0x8 rflags 0x10216 __ALIGN_SIZE+0xf216 rsp 0xffff80002956d1a0 ss 0x10 witness_checkorder+0x4f5: movl 0x10(%r14),%ecx ddb{1}> show proc PROC (syz-executor.0) pid=478913 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000212f6d58,0xffff800021274d58 process=0xffff800021304018 user=0xffff800029568000, vmspace=0xfffffd8067754760 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37976 405306 76929 0 2 0 syz-executor.2 79270 399285 74415 0 2 0 syz-executor.6 1716 464159 0 0 3 0x14200 acct acct 30739 485512 52691 0 3 0x82 nanoslp syz-executor.3 62985 345181 52691 0 3 0x2 biowait syz-executor.1 20132 451595 52691 0 3 0x82 nanoslp syz-executor.0 61034 317404 1 0 3 0x100083 ttyin getty 41811 463080 0 0 3 0x14280 nfsidl nfsio 23111 104808 0 0 3 0x14280 nfsidl nfsio 64459 506588 0 0 3 0x14280 nfsidl nfsio 7873 32664 0 0 3 0x14280 nfsidl nfsio 84736 252442 0 0 3 0x14280 nfsidl nfsio 66724 468821 0 0 3 0x14280 nfsidl nfsio 26625 450725 0 0 3 0x14280 nfsidl nfsio 47646 153260 0 0 3 0x14280 nfsidl nfsio 61373 461149 0 0 3 0x14280 nfsidl nfsio 83401 301302 0 0 3 0x14280 nfsidl nfsio 93238 99782 0 0 3 0x14280 nfsidl nfsio 4334 233208 0 0 3 0x14280 nfsidl nfsio 75319 105265 0 0 3 0x14280 nfsidl nfsio 93389 120649 0 0 3 0x14280 nfsidl nfsio 7437 415514 0 0 3 0x14280 nfsidl nfsio 10774 126358 0 0 3 0x14280 nfsidl nfsio 54281 259028 0 0 3 0x14280 nfsidl nfsio 49896 445190 0 0 3 0x14280 nfsidl nfsio 75778 325699 0 0 3 0x14280 nfsidl nfsio 71799 264423 0 0 3 0x14280 nfsidl nfsio 65857 511730 52691 0 3 0x82 nanoslp syz-executor.7 76929 60596 52691 0 3 0x82 nanoslp syz-executor.2 45256 160520 52691 0 3 0x2 biowait syz-executor.4 75315 204992 0 0 3 0x14200 bored sosplice 74415 115422 52691 0 3 0x82 nanoslp syz-executor.6 82771 96491 52691 0 3 0x2 biowait syz-executor.5 52691 395219 60793 0 3 0x2000082 wait syz-fuzzer 52691 346473 60793 0 3 0x6000082 nanoslp syz-fuzzer 52691 352449 60793 0 3 0x6000082 thrsleep syz-fuzzer 52691 74898 60793 0 3 0x6000082 wait syz-fuzzer 52691 26487 60793 0 3 0x6000082 thrsleep syz-fuzzer 52691 81149 60793 0 3 0x6000082 kqread syz-fuzzer 52691 140680 60793 0 3 0x6000082 wait syz-fuzzer 52691 270198 60793 0 3 0x6000082 thrsleep syz-fuzzer 52691 467488 60793 0 3 0x6000082 wait syz-fuzzer 52691 374347 60793 0 3 0x6000082 wait syz-fuzzer 52691 93597 60793 0 3 0x6000082 thrsleep syz-fuzzer 52691 114673 60793 0 3 0x6000082 thrsleep syz-fuzzer 52691 100774 60793 0 3 0x6000082 wait syz-fuzzer 52691 120662 60793 0 3 0x6000082 wait syz-fuzzer 52691 140010 60793 0 3 0x6000082 thrsleep syz-fuzzer 52691 196867 60793 0 3 0x6000082 wait syz-fuzzer 60793 362911 50074 0 3 0x10008a sigsusp ksh 50074 467619 24113 0 3 0x9a kqread sshd 24113 315449 1 0 3 0x88 kqread sshd 79803 277034 46935 74 3 0x1100092 bpf pflogd 46935 486648 1 0 3 0x80 netio pflogd 86337 418398 35425 73 3 0x1100090 kqread syslogd 35425 342238 1 0 3 0x100082 netio syslogd 84086 87656 1 0 3 0x100080 kqread resolvd 4012 264877 14497 77 3 0x100092 kqread dhcpleased 28759 184891 14497 77 3 0x100092 kqread dhcpleased 14497 118915 1 0 3 0x80 kqread dhcpleased 87733 418130 0 0 3 0x14200 bored smr 88339 501367 0 0 2 0x14200 zerothread 78917 424 0 0 3 0x14200 aiodoned aiodoned 71828 210041 0 0 3 0x14200 syncer update 62538 449786 0 0 3 0x14200 cleaner cleaner 35643 246980 0 0 7 0x14200 reaper 67019 96462 0 0 3 0x14200 pgdaemon pagedaemon 53297 458775 0 0 3 0x14200 bored viomb 49963 699 0 0 3 0x40014200 acpi0 acpi0 71744 331234 0 0 3 0x40014200 idle1 73798 357641 0 0 3 0x14200 bored softnet3 82774 416897 0 0 3 0x14200 bored softnet2 82660 131225 0 0 3 0x14200 bored softnet1 34782 480091 0 0 3 0x14200 bored softnet0 74440 42689 0 0 3 0x14200 bored systqmp 17968 79581 0 0 3 0x14200 bored systq 23162 158673 0 0 3 0x40014200 bored softclock 53954 208223 0 0 3 0x40014200 idle0 1 155251 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 62985 (syz-executor.1) thread 0xffff800021287808 (345181) exclusive rrwlock inode r = 0 (0xfffffd80709a16f8) #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 (0xfffffd80709a1808) #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 45256 (syz-executor.4) thread 0xffff8000212af548 (160520) exclusive rrwlock inode r = 0 (0xfffffd806e1ba3d8) #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 (0xfffffd806e1b72b8) #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 82771 (syz-executor.5) thread 0xffff800021212ac0 (96491) exclusive rrwlock inode r = 0 (0xfffffd807b1111a8) #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 (0xfffffd80662cf0a8) #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 10210 6558K 7334K 78643K 20765 0 pcb 13 15K 17K 78643K 294 0 rtable 251 7K 7K 78643K 889 0 pf 32 9K 10K 78643K 131 0 ifaddr 45 15K 16K 78643K 121 0 ifgroup 55 2K 2K 78643K 199 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 36K 78643K 140 0 ioctlops 0 0K 4K 78643K 1660 0 iov 0 0K 18K 78643K 460 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1471 92K 92K 78643K 7031 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 51 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 660 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 13 45K 93K 78643K 5457 0 sigio 1 0K 0K 78643K 125 0 proc 69 91K 128K 78643K 1082 0 subproc 104 6K 6K 78643K 234 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 149 0 in_multi 99 7K 7K 78643K 243 0 ether_multi 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 103 466K 466K 78643K 103 0 exec 0 0K 1K 78643K 993 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 89K 103K 78643K 55824 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 191 0 NDP 12 0K 1K 78643K 88 0 temp 74 5920K 6000K 78643K 47659 0 kqueue 12 18K 33K 78643K 424 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 120 211 0 208 2 1 1 2 0 8 0 rtentry 112 236 0 119 4 0 4 4 0 8 0 unpcb 144 4748 0 4733 47 46 1 6 0 8 0 syncache 304 54 0 54 12 12 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 769 0 769 14 14 0 2 0 8 0 tcpcb 808 1093 0 1083 51 50 1 14 0 8 0 arp 120 41 0 22 1 0 1 1 0 8 0 inpcb 368 4180 0 4166 83 81 2 14 0 8 0 nd6 136 60 0 30 2 0 2 2 0 8 0 pkpcb 40 4 0 4 1 1 0 1 0 8 0 kcovpl 48 18 0 10 1 0 1 1 0 8 0 ppxss 1256 12 0 12 2 2 0 1 0 8 0 pffrag 232 66 0 65 6 5 1 1 0 482 0 pffrnode 88 66 0 65 6 5 1 1 0 8 0 pffrent 40 144 0 143 6 5 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 24 219 0 204 1 0 1 1 0 8 0 pfstkey 128 219 0 204 4 2 2 2 0 8 0 pfstate 376 219 0 204 10 7 3 6 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 256 916 0 442 30 0 30 30 0 8 0 art_table 32 917 0 442 4 0 4 4 0 8 0 art_node 16 229 0 122 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 11 2 1 1 1 0 8 0 semapl 112 658 0 648 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 10699 0 9224 94 1 93 93 0 8 0 ffsino 272 10699 0 9224 100 1 99 99 0 8 0 nchpl 144 18143 0 16491 64 0 64 64 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 68889 0 68888 3 2 1 2 0 8 0 percpumem 16 83 0 40 1 0 1 1 0 8 0 vmpool 696 34 0 34 6 6 0 1 0 8 0 kstatmem 264 104 0 80 2 0 2 2 0 8 0 scxspl 216 54154 0 54151 28 27 1 8 1 8 0 plimitpl 152 469 0 453 1 0 1 1 0 8 0 sigapl 424 5783 0 5716 10 2 8 8 0 8 0 futexpl 64 43086 0 43086 3 2 1 1 0 8 1 knotepl 120 392 0 0 7 0 7 7 0 8 0 kqueuepl 216 876 0 868 15 14 1 5 0 8 0 pipepl 320 1417 0 1389 45 42 3 8 0 8 0 fdescpl 496 5744 0 5718 6 2 4 5 0 8 0 filepl 152 44309 0 44069 97 86 11 19 0 8 0 lockfpl 104 2172 0 2170 6 5 1 2 0 8 0 lockfspl 48 850 0 848 1 0 1 1 0 8 0 sessionpl 144 36 0 19 1 0 1 1 0 8 0 pgrppl 48 60 0 43 1 0 1 1 0 8 0 ucredpl 104 13798 0 13786 1 0 1 1 0 8 0 zombiepl 144 5719 0 5716 1 0 1 1 0 8 0 processpl 1072 5783 0 5716 5 0 5 5 0 8 0 procpl 680 15345 0 15262 11 2 9 10 0 8 0 sosppl 168 68 0 66 12 11 1 1 0 8 0 sockpl 488 9159 0 9128 210 204 6 22 0 8 0 mcl64k 65536 24 0 0 3 1 2 3 0 8 0 mcl16k 16384 16 0 0 2 0 2 2 0 8 0 mcl12k 12288 16 0 0 2 0 2 2 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 45 0 0 5 1 4 5 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 451 0 0 43 7 36 43 0 8 0 mtagpl 96 466 0 0 11 0 11 11 0 8 0 mbufpl 256 14900 0 0 926 0 926 926 0 8 0 bufpl 288 13825 0 7498 453 0 453 453 0 8 0 anonpl 24 683710 0 670293 209 113 96 132 0 186 0 amapchunkpl 152 175898 0 175107 76 38 38 48 0 158 0 amappl16 200 15395 0 15030 102 81 21 45 0 8 0 amappl15 192 23 0 22 2 1 1 1 0 8 0 amappl14 184 192 0 177 2 1 1 2 0 8 0 amappl13 176 31 0 31 5 5 0 1 0 8 0 amappl12 168 6563 0 6536 4 2 2 3 0 8 0 amappl11 160 66 0 52 1 0 1 1 0 8 0 amappl10 152 37 0 24 1 0 1 1 0 8 0 amappl9 144 288 0 288 12 11 1 1 0 8 1 amappl8 136 415 0 313 4 0 4 4 0 8 0 amappl7 128 80 0 66 2 0 2 2 0 8 0 amappl6 120 344 0 319 2 1 1 2 0 8 0 amappl5 112 359 0 348 1 0 1 1 0 8 0 amappl4 104 735 0 688 3 1 2 3 0 8 0 amappl3 96 34579 0 34515 4 1 3 3 0 8 0 amappl2 88 6160 0 6085 4 2 2 4 0 8 0 amappl1 80 29087 0 28548 24 10 14 23 0 8 0 amappl 88 55070 0 54860 8 1 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 5778 0 5752 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5778 0 5752 1 0 1 1 0 8 0 vmmpekpl 168 49338 0 49286 3 0 3 3 0 8 0 vmmpepl 168 360574 0 358368 227 115 112 129 0 357 0 vmsppl 464 5777 0 5751 5 1 4 5 0 8 0 rwobjpl 56 97428 0 89905 123 14 109 114 0 8 0 pdppl 4096 11564 0 11502 408 338 70 84 0 8 8 pvpl 32 1842431 0 1823389 496 319 177 348 0 265 0 pmappl 248 5777 0 5751 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2225 0 489 51 0 51 51 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82ba6ff0) 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(ffffffff82cd0260) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cd0260) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff8000211b9a90,ffff80000007b080) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff82cd0260) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cd0260) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_unmap_detach(ffff8000211b9bf0,1) at uvm_unmap_detach+0x113 sys/uvm/uvm_map.c:1382 uvm_map_teardown(fffffd807eff9000) at uvm_map_teardown+0x2c5 sys/uvm/uvm_map.c:2585 uvmspace_free(fffffd807eff9000) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3503 reaper(ffff8000211b32a0) at reaper+0x19a sys/kern/kern_exit.c:466 end trace frame: 0x0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x4f5: movl 0x10(%r14),%ecx ddb{1}> trace witness_checkorder(fffffd806ef59370,9,0) at witness_checkorder+0x4f5 witness_lock_order_check sys/kern/subr_witness.c:2442 [inline] witness_checkorder(fffffd806ef59370,9,0) at witness_checkorder+0x4f5 sys/kern/subr_witness.c:890 mtx_enter(fffffd806ef59360) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000212f7000,fffffd806ef59360,fffffd806ef593e8,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212f7000,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212f7000) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212f7000,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212f7000,ffff80002956d4b0,ffff80002956d500) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002956d580) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002956d580) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70d869abc270, count: -9