witness: lock order reversal: 1st 0xffff80003a3aaee0 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffc807035bd70 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff834a679b -> 0xffffffff834944ad is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 sblock+0xb6 sys/kern/uipc_socket2.c:536 #2 soreceive+0x27d sys/kern/uipc_socket.c:890 #3 fifo_read+0x117 sys/miscfs/fifofs/fifo_vnops.c:264 #4 VOP_READ+0x101 sys/kern/vfs_vops.c:227 #5 vn_rdwr+0x15b sys/kern/vfs_vnops.c:-1 #6 vndsetcred+0xa1 sys/dev/vnd.c:685 #7 vndioctl+0xdfc sys/dev/vnd.c:486 #8 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #9 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:537 #10 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #11 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] fdlock (&newfdp->fd_fd.fd_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 unp_externalize+0x3cf sys/kern/uipc_usrreq.c:1074 #2 soreceive+0xc24 sys/kern/uipc_socket.c:1029 #3 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #6 Xsyscall+0x128 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> show kasan No such command ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffc807035bd70,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffc807035bd58,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffc807035bd58,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffc807045f1c0,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffc807045f1c0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576 vn_closefile(fffffc806d70ea20,ffff80003c3b82b8) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffc806d70ea20,ffff80003c3b82b8) at vn_closefile+0x111 sys/kern/vfs_vnops.c:621 fdrop(fffffc806d70ea20,ffff80003c3b82b8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 knote_remove(ffff80003c3b82b8,fffffc806fbb3a80,fffffc806fbb3b10,4,0) at knote_remove+0x368 sys/kern/kern_event.c:2186 knote_fdclose(ffff80003c3b82b8,4) at knote_fdclose+0xf9 sys/kern/kern_event.c:2221 fdrelease(ffff80003c3b82b8,4) at fdrelease+0xf9 sys/kern/kern_descrip.c:761 syscall(ffff80003c41d770) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41d770) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x91f704ab400, count: -13 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c41d270 rbx 0 rdx 0 rcx 0xffff80003c3b82b8 rax 0xffff80002999dff0 r8 0xffff80003c41d150 r9 0x8080808080808080 r10 0x92ee5bdee05e48e7 r11 0xc979b882f41b4da8 r12 0xfffffc80040cbd80 r13 0xfffffc80048b8708 r14 0x3 r15 0xffffffff8352d5eb substchar+0xfcaf rip 0xffffffff8202e225 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c41d260 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=425829 pid=6441 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3b8550,0xffff80003c3b8a90 process=0xffff80002a37c9b8 user=0xffff80003c418000, vmspace=0xfffffc806b34a028 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 6441 376944 66262 0 2 0 0 syz-executor * 6441 425829 66262 0 7 0 0x4000000 syz-executor 6441 190954 66262 0 3 0 0x4000080 fsleep syz-executor 6441 149477 66262 0 3 0 0x4000080 fsleep syz-executor 35309 374965 23942 0 2 0x100002 0 sh 6000 370350 93955 0 2 0 0 syz-executor 6000 40221 93955 0 3 0 0x4000080 fsleep syz-executor 6000 284433 93955 0 3 0 0x4000080 fsleep syz-executor 6000 178714 93955 0 3 0 0x4000080 fsleep syz-executor 5615 352732 5539 0 2 0 0xc80 syz-executor 5615 96934 5539 0 3 0 0x4000080 kqread syz-executor 5615 523571 5539 0 3 0 0x4000080 fsleep syz-executor 23507 219529 54665 0 2 0 0 syz-executor 23507 252812 54665 0 3 0 0x4000080 kqpoll syz-executor 23507 343769 54665 0 3 0 0x4000080 fsleep syz-executor 10765 364073 60315 0 2 0 0 syz-executor 10765 451751 60315 0 2 0 0x4000000 syz-executor 10765 259643 60315 0 3 0 0x4000080 fsleep syz-executor 94504 31902 22583 0 3 0 0x80 nanoslp syz-executor 94504 48703 22583 0 3 0 0x4000080 fsleep syz-executor 94504 330497 22583 0 2 0 0x4000000 syz-executor 23942 159696 65298 0 3 0x2 0x80 wait syz-executor 79282 110148 1 0 3 0x2 0x80 nanoslp getty 60315 373277 65298 0 3 0x2 0x80 nanoslp syz-executor 66262 290524 65298 0 2 0x2 0xc80 syz-executor 5539 233019 65298 0 2 0x2 0xc80 syz-executor 54665 286104 65298 0 7 0x2 0x1 syz-executor 22583 1549 65298 0 2 0x2 0xc80 syz-executor 81394 443154 65298 0 3 0x2 0 biowait syz-executor 93955 83770 65298 0 2 0x2 0xc80 syz-executor 65298 330280 93825 0 3 0x2 0x80 kqread syz-executor 93825 330209 11918 0 3 0x100002 0x88 sigsusp ksh 11918 226822 88626 0 3 0x10 0x88 kqread sshd-session 88626 59909 44047 0 3 0x12 0x80 kqread sshd-session 44047 5701 1 0 3 0 0x88 kqread sshd 72575 415211 83960 74 3 0x1100012 0x80 bpf pflogd 83960 347967 1 0 3 0 0x80 sbwait pflogd 64689 403496 7876 73 3 0x1100010 0x80 kqread syslogd 7876 289561 1 0 3 0x100002 0x80 sbwait syslogd 84750 110461 1 0 3 0x100000 0x80 kqread resolvd 5296 473532 92870 77 3 0x100012 0x80 kqread dhcpleased 11312 501408 92870 77 3 0x100012 0x80 kqread dhcpleased 92870 347256 1 0 3 0 0x80 kqread dhcpleased 19750 229757 0 0 3 0x14000 0x200 bored smr 99029 74539 0 0 2 0x14000 0x200 zerothread 50829 482650 0 0 3 0x14000 0x200 aiodoned aiodoned 36178 183417 0 0 3 0x14000 0x200 syncer update 74917 328415 0 0 3 0x14000 0x200 cleaner cleaner 12230 410127 0 0 3 0x14000 0x200 reaper reaper 23955 502571 0 0 3 0x14000 0x200 pgdaemon pagedaemon 31967 243214 0 0 3 0x14000 0x200 bored viomb 59645 40030 0 0 3 0x14000 0x40000200 acpi0 acpi0 54950 217187 0 0 3 0x14000 0x40000200 idle1 75434 97871 0 0 3 0x14000 0x200 bored softnet1 21666 459554 0 0 2 0x14000 0x200 softnet0 88510 347908 0 0 3 0x14000 0x200 bored systqmp 50731 342107 0 0 3 0x14000 0x200 bored systq 44666 506505 0 0 3 0x14000 0x200 tmoslp softclockmp 46684 316231 0 0 3 0x14000 0x40000200 tmoslp softclock 27736 140934 0 0 3 0x14000 0x40000200 idle0 1 185068 0 0 3 0x40000002 0x80 wait init 0 0 -1 0 3 0x10010000 0x200 scheduler swapper ddb{1}> show all locks Process 6441 (syz-executor) thread 0xffff80003c3b82b8 (425829) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83aeac80) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:614 #2 fdrop+0x121 sys/kern/kern_descrip.c:1281 #3 knote_remove+0x368 sys/kern/kern_event.c:2186 #4 knote_fdclose+0xf9 sys/kern/kern_event.c:2221 #5 fdrelease+0xf9 sys/kern/kern_descrip.c:761 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #7 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xffff80003a3aaee0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 sys_close+0xd0 sys/kern/kern_descrip.c:779 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 Process 81394 (syz-executor) thread 0xffff80002a223c98 (443154) exclusive rrwlock inode r = 0 (0xfffffc806f70a6e0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:150 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3063 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffc806ddc47a0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3048 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11065 12095K 12419K 166960K 12729 0 pcb 17 12K 12K 166960K 88 0 rtable 188 6K 7K 166960K 396 0 pf 38 18K 37K 166960K 157 0 ifaddr 37 6K 8K 166960K 63 0 ifgroup 55 2K 2K 166960K 103 0 sysctl 2 1K 9K 166960K 8 0 counters 70 37K 38K 166960K 106 0 ioctlops 0 0K 4K 166960K 1557 0 iov 0 0K 12K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1285 81K 82K 166960K 1651 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 32 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 17 61K 97K 166960K 489 0 sigio 0 0K 0K 166960K 14 0 proc 72 115K 180K 166960K 616 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 26 0 in_multi 69 4K 6K 166960K 104 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 514 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 177K 186K 166960K 6292 0 UVM aobj 10 2K 2K 166960K 11 0 pinsyscall 42 84K 104K 166960K 1668 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 8 0 NDP 12 0K 2K 166960K 40 0 temp 47 9124K 9187K 166960K 24550 0 kqueue 16 26K 32K 166960K 118 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 55 0 52 1 0 1 1 0 8 0 rtentry 176 125 0 42 6 0 6 6 0 8 0 unpcb 144 190 0 168 2 0 2 2 0 8 1 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 80 0 76 1 0 1 1 0 8 0 arp 136 20 0 4 1 0 1 1 0 8 0 inpcb 328 319 0 311 2 0 2 2 0 8 1 nd6 152 30 0 8 2 0 2 2 0 8 1 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 9 0 9 1 0 1 1 0 8 1 pppxif 1576 3 0 3 2 1 1 1 0 8 1 pfstscr 40 9 0 5 1 0 1 1 0 8 0 pffrag 232 4 0 0 1 0 1 1 0 482 0 pffrnode 88 4 0 0 1 0 1 1 0 8 0 pffrent 40 5 0 1 1 0 1 1 0 8 0 pfosfp 40 1428 0 1428 5 0 5 5 0 8 5 pfosfpen 112 1428 0 1428 21 0 21 21 0 8 21 pfsrclim 320 1 0 1 1 1 0 1 0 8 0 pfanchor 1288 8 0 4 1 0 1 1 0 8 0 pftag 88 4 0 0 1 0 1 1 0 8 0 pfstitem 24 28 0 1 1 0 1 1 0 8 0 pfstkey 128 33 0 7 1 0 1 1 0 8 0 pfstate 448 28 0 4 3 0 3 3 0 8 0 pfrule 1360 31 0 25 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 511 0 181 29 1 28 29 0 8 4 art_table 40 512 0 181 5 0 5 5 0 8 0 art_node 32 125 0 51 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 72 27 0 17 1 0 1 1 0 8 0 shmpl 112 8 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2212 0 752 93 0 93 93 0 8 0 ffsino 296 2212 0 752 114 0 114 114 0 8 0 nchpl 144 2906 0 1199 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 vnodes 216 2467 0 0 138 0 138 138 0 8 0 namei 1024 9092 0 9091 2 1 1 2 0 8 0 percpumem 16 69 0 18 1 0 1 1 0 8 0 kstatmem 264 51 0 24 3 1 2 3 0 8 0 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 10287 0 10286 9 7 2 8 1 8 1 plimitpl 152 162 0 143 1 0 1 1 0 8 0 sigapl 424 805 0 758 7 1 6 7 0 8 0 knotepl 120 754 0 0 23 0 23 23 0 8 0 kqueuepl 224 216 0 203 5 3 2 5 0 8 1 pipepl 344 158 0 131 3 0 3 3 0 8 0 fdescpl 528 789 0 758 3 0 3 3 0 8 0 filepl 160 3696 0 3472 13 2 11 13 0 8 1 lockfpl 104 191 0 188 1 0 1 1 0 8 0 lockfspl 48 82 0 79 1 0 1 1 0 8 0 sessionpl 144 42 0 34 1 0 1 1 0 8 0 pgrppl 48 56 0 40 1 0 1 1 0 8 0 ucredpl 104 500 0 487 1 0 1 1 0 8 0 zombiepl 144 758 0 758 1 0 1 1 0 8 1 processpl 1232 805 0 758 5 1 4 5 0 8 0 procpl 664 1393 0 1332 6 0 6 6 0 8 0 sockpl 752 579 0 546 5 0 5 5 0 8 1 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k128 9344 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 1 mextrefs 64 24 0 0 1 0 1 1 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 153 0 0 10 0 10 10 0 8 0 bufpl 272 3329 0 107 215 0 215 215 0 8 0 anonpl 32 5434 0 0 44 0 44 44 0 247 0 amapchunkpl 152 18926 0 18410 24 1 23 24 0 158 3 amappl16 200 2134 0 2106 5 2 3 5 0 8 0 amappl15 192 50 0 50 1 1 0 1 0 8 0 amappl14 184 451 0 449 1 0 1 1 0 8 0 amappl13 176 128 0 116 1 0 1 1 0 8 0 amappl12 168 1044 0 1014 2 0 2 2 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 67 0 52 1 0 1 1 0 8 0 amappl9 144 275 0 275 1 1 0 1 0 8 0 amappl8 136 102 0 100 1 0 1 1 0 8 0 amappl7 128 179 0 166 1 0 1 1 0 8 0 amappl6 120 162 0 159 1 0 1 1 0 8 0 amappl5 112 187 0 174 1 0 1 1 0 8 0 amappl4 104 317 0 295 1 0 1 1 0 8 0 amappl3 96 3449 0 3344 3 0 3 3 0 8 0 amappl2 88 902 0 824 2 0 2 2 0 8 0 amappl1 80 11938 0 11329 15 2 13 15 0 8 0 amappl 88 5498 0 5326 5 0 5 5 0 92 0 uvmvnodes 80 105 0 0 3 0 3 3 0 8 0 dma65536 65536 2 0 2 1 1 0 1 0 8 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 128 255 0 255 2 1 1 1 0 8 1 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 1 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 10 0 1 1 0 1 1 0 8 0 uaddrrnd 24 789 0 758 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 789 0 758 1 0 1 1 0 8 0 vmmpekpl 168 8301 0 8257 3 0 3 3 0 8 0 vmmpepl 168 57929 0 56005 88 0 88 88 0 357 1 vmsppl 488 788 0 758 6 1 5 5 0 8 0 rwobjpl 80 18639 0 17558 24 1 23 24 0 8 0 pdppl 4096 1585 0 1516 103 30 73 87 0 8 4 pvpl 32 14365 0 0 117 1 116 116 0 265 0 pmappl 256 788 0 758 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 493 0 37 14 0 14 14 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8396aff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83aea480) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83aea480) at __mp_lock+0x199 sys/kern/kern_lock.c:173 intr_handler(ffff80002a302c00,ffff8000002a2900) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff83aea480) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83aea480) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrsysret(ffff80002a222010,5b,0,ffff80002a302df0) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a222010,5b,0,ffff80002a302df0) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a302ea0) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a302ea0) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:812 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78e92470dd60, count: -10 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffc807035bd70,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffc807035bd58,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffc807035bd58,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffc807045f1c0,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffc807045f1c0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576 vn_closefile(fffffc806d70ea20,ffff80003c3b82b8) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffc806d70ea20,ffff80003c3b82b8) at vn_closefile+0x111 sys/kern/vfs_vnops.c:621 fdrop(fffffc806d70ea20,ffff80003c3b82b8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 knote_remove(ffff80003c3b82b8,fffffc806fbb3a80,fffffc806fbb3b10,4,0) at knote_remove+0x368 sys/kern/kern_event.c:2186 knote_fdclose(ffff80003c3b82b8,4) at knote_fdclose+0xf9 sys/kern/kern_event.c:2221 fdrelease(ffff80003c3b82b8,4) at fdrelease+0xf9 sys/kern/kern_descrip.c:761 syscall(ffff80003c41d770) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41d770) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x91f704ab400, count: -13