witness: lock order reversal: 1st 0xfffffd806be2ae48 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806e00ecc0 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff8314c474 -> 0xffffffff830d64b2 is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 sblock+0xb7 sys/kern/uipc_socket2.c:537 #2 soreceive+0x28e sys/kern/uipc_socket.c:876 #3 fifo_read+0x11a sys/miscfs/fifofs/fifo_vnops.c:264 #4 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #5 vn_rdwr+0x15b #6 vndsetcred+0xa1 sys/dev/vnd.c:684 #7 vndioctl+0xe6c sys/dev/vnd.c:485 #8 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #9 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #10 sys_ioctl+0x5c3 #11 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] fdlock (&newfdp->fd_fd.fd_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 unp_externalize+0x3e4 sys/kern/uipc_usrreq.c:1070 #2 soreceive+0xc73 sys/kern/uipc_socket.c:1015 #3 recvit+0x40a sys/kern/uipc_syscalls.c:1072 #4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #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}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd806e00ecc0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e00eca8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e00eca8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806e00f708,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806e00f708,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd805d51c2f8,ffff80003c590a50) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805d51c2f8,ffff80003c590a50) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd805d51c2f8,ffff80003c590a50) at fdrop+0x126 sys/kern/kern_descrip.c:1265 knote_remove(ffff80003c590a50,fffffd806ebde288,fffffd806ebde310,3,0) at knote_remove+0x403 sys/kern/kern_event.c:2014 knote_fdclose(ffff80003c590a50,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2049 fdrelease(ffff80003c590a50,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:749 syscall(ffff80003a982a40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a982a40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x24756ce3aa0, count: -13 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003a982520 rbx 0xfffffd800433d3c8 rdx 0xffff80000128b0c0 rcx 0xffff80003c590a50 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003a982400 r9 0x8080808080808080 r10 0x623cb923ab194187 r11 0xb8a589e93a4dd027 r12 0 r13 0xfffffd8003b53f00 r14 0x3 r15 0xffffffff rip 0xffffffff8239cdf5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003a982510 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=55844 pid=19329 tcnt=3 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=0xffff80003c591470,0xffff80003c590550 process=0xffff800036965940 user=0xffff80003a97d000, vmspace=0xfffffd805f062ca8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 33894 91095 75264 0 7 0 syz-executor 33894 331751 75264 0 2 0x4000000 syz-executor 53475 417391 71828 0 2 0 syz-executor 53475 189774 71828 0 3 0x4000080 fsleep syz-executor 19329 405440 36567 0 2 0 syz-executor *19329 55844 36567 0 7 0x4000000 syz-executor 19329 91061 36567 0 3 0x4000080 fsleep syz-executor 12980 259684 63175 0 2 0 syz-executor 12980 213058 63175 0 3 0x4000080 kqread syz-executor 12980 485384 63175 0 3 0x4000080 kqread syz-executor 10194 13703 94738 0 3 0x80 nanoslp syz-executor 10194 399826 94738 0 3 0x4000080 kqsel syz-executor 10194 86077 94738 0 3 0x4000080 fsleep syz-executor 75264 235243 92443 0 3 0x82 nanoslp syz-executor 91379 410034 92443 0 3 0x82 wait syz-executor 93866 427938 0 0 3 0x14200 acct acct 95096 421668 1 0 3 0x80 nanoslp init 16484 460070 92443 0 3 0x2 biowait syz-executor 89833 46127 0 0 3 0x14200 bored sosplice 71828 252229 92443 0 3 0x82 nanoslp syz-executor 63175 204747 92443 0 3 0x82 nanoslp syz-executor 94738 89276 92443 0 3 0x82 nanoslp syz-executor 36567 63749 92443 0 3 0x82 nanoslp syz-executor 31518 91788 92443 0 3 0x82 piperd syz-executor 92443 289364 99701 0 2 0x2 syz-executor 99701 423228 13429 0 3 0x10008a sigsusp ksh 13429 270522 58739 0 3 0x98 kqread sshd-session 58739 452178 27759 0 3 0x92 kqread sshd-session 27759 375129 1 0 3 0x88 kqread sshd 78383 484648 8363 74 3 0x1100092 bpf pflogd 8363 414059 1 0 3 0x80 sbwait pflogd 43344 379283 82363 73 3 0x1100090 kqread syslogd 82363 497364 1 0 3 0x100082 sbwait syslogd 94157 230513 1 0 3 0x100080 kqread resolvd 35920 183072 17481 77 3 0x100092 kqread dhcpleased 37233 96020 17481 77 3 0x100092 kqread dhcpleased 17481 278159 1 0 3 0x80 kqread dhcpleased 3657 327958 0 0 3 0x14200 bored smr 8218 88514 0 0 2 0x14200 zerothread 38358 439002 0 0 3 0x14200 aiodoned aiodoned 2833 486129 0 0 3 0x14200 syncer update 2093 93367 0 0 3 0x14200 cleaner cleaner 5965 294999 0 0 3 0x14200 reaper reaper 12058 152254 0 0 3 0x14200 pgdaemon pagedaemon 66775 500795 0 0 3 0x14200 bored viomb 43576 497291 0 0 3 0x40014200 acpi0 acpi0 57132 373834 0 0 3 0x40014200 idle1 34674 98341 0 0 3 0x14200 bored softnet3 14538 416707 0 0 3 0x14200 bored softnet2 8949 262429 0 0 3 0x14200 bored softnet1 32870 14298 0 0 2 0x14200 softnet0 63976 488096 0 0 3 0x14200 bored systqmp 99261 427809 0 0 3 0x14200 bored systq 43142 184350 0 0 3 0x14200 tmoslp softclockmp 50508 38924 0 0 3 0x40014200 tmoslp softclock 45826 406707 0 0 3 0x40014200 idle0 1 76625 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 19329 (syz-executor) thread 0xffff80003c590a50 (55844) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff836710f8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x126 sys/kern/kern_descrip.c:1265 #3 knote_remove+0x403 sys/kern/kern_event.c:2014 #4 knote_fdclose+0xf9 sys/kern/kern_event.c:2049 #5 fdrelease+0xf9 sys/kern/kern_descrip.c:749 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd806be2ae48) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sys_close+0xc4 sys/kern/kern_descrip.c:767 #3 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #4 Xsyscall+0x128 Process 16484 (syz-executor) thread 0xffff8000ffff76f0 (460070) exclusive rrwlock inode r = 0 (0xfffffd806beb29a0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:694 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b7b70a0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10237 11161K 11422K 166960K 13338 0 pcb 17 17K 19K 166960K 331 0 rtable 228 7K 8K 166960K 803 0 pf 35 17K 19K 166960K 73 0 ifaddr 42 7K 7K 166960K 69 0 ifgroup 55 2K 2K 166960K 90 0 sysctl 4 1K 1K 166960K 4 0 counters 64 36K 36K 166960K 82 0 ioctlops 0 0K 4K 166960K 1707 0 iov 0 0K 12K 166960K 65 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1395 88K 88K 166960K 2598 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 16 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 41 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 16 57K 93K 166960K 1282 0 sigio 1 0K 0K 166960K 20 0 proc 63 79K 128K 166960K 709 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 190 0 in_multi 94 6K 7K 166960K 169 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 689 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 224 73K 88K 166960K 13503 0 UVM aobj 40 4K 4K 166960K 41 0 pinsyscall 40 80K 105K 166960K 2513 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 75 0 NDP 12 0K 2K 166960K 45 0 temp 67 6898K 7149K 166960K 31086 0 kqueue 14 22K 32K 166960K 208 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 180 0 177 3 0 3 3 0 8 2 rtentry 112 297 0 194 4 0 4 4 0 8 0 unpcb 144 978 0 957 7 2 5 6 0 8 4 syncache 336 11 0 11 2 1 1 1 0 8 1 tcpqe 32 3 0 3 3 2 1 1 0 8 1 tcpcb 808 430 0 423 14 6 8 8 0 8 7 arp 120 93 0 75 1 0 1 1 0 8 0 inpcb 376 1712 0 1702 25 16 9 15 0 8 7 nd6 136 40 0 14 1 0 1 1 0 8 0 pkpcb 40 7 0 7 3 2 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1168 3 0 3 1 0 1 1 0 8 1 pffrag 232 8 0 1 1 0 1 1 0 482 0 pffrnode 88 6 0 0 1 0 1 1 0 8 0 pffrent 40 15 0 8 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 68 0 19 1 0 1 1 0 8 0 pfstkey 128 68 0 19 2 0 2 2 0 8 0 pfstate 376 68 0 19 6 0 6 6 0 8 0 pfrule 1344 22 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 732 0 285 33 4 29 29 0 8 0 art_table 32 735 0 285 4 0 4 4 0 8 0 art_node 16 295 0 207 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 6 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 38 0 28 1 0 1 1 0 8 0 shmpl 112 38 0 1 2 0 2 2 0 8 0 dirhash 1024 36 0 19 3 0 3 3 0 8 0 dino2pl 256 3902 0 2391 95 0 95 95 0 8 0 ffsino 280 3902 0 2391 109 0 109 109 0 8 0 nchpl 144 5750 0 5189 63 39 24 63 0 8 0 uvmvnodes 80 3410 0 0 70 0 70 70 0 8 0 vnodes 216 3410 0 0 190 0 190 190 0 8 0 namei 1024 19829 0 19829 3 2 1 2 0 8 1 percpumem 16 55 0 9 1 0 1 1 0 8 0 kstatmem 264 42 0 18 2 0 2 2 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 4 0 4 3 2 1 1 0 8 1 scxspl 216 17666 0 17665 10 7 3 8 1 8 2 plimitpl 152 334 0 316 1 0 1 1 0 8 0 sigapl 424 1596 0 1546 8 2 6 7 0 8 0 futexpl 64 17022 0 17019 1 0 1 1 0 8 0 knotepl 120 751 0 0 23 0 23 23 0 8 0 kqueuepl 216 519 0 507 9 4 5 5 0 8 4 pipepl 328 275 0 248 5 2 3 5 0 8 0 fdescpl 504 1576 0 1546 5 0 5 5 0 8 0 filepl 152 11059 0 10840 25 9 16 19 0 8 6 lockfpl 104 427 0 424 1 0 1 1 0 8 0 lockfspl 48 150 0 147 1 0 1 1 0 8 0 sessionpl 144 32 0 24 1 0 1 1 0 8 0 pgrppl 48 52 0 36 1 0 1 1 0 8 0 ucredpl 104 2576 0 2562 1 0 1 1 0 8 0 zombiepl 144 1547 0 1546 1 0 1 1 0 8 0 processpl 1168 1596 0 1546 5 1 4 5 0 8 0 procpl 648 3427 0 3369 7 1 6 6 0 8 0 srpgc 96 12 0 12 3 2 1 1 0 8 1 sockpl 688 2899 0 2865 26 14 12 16 0 8 7 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 106 0 0 14 0 14 14 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mtagpl 96 11 0 0 1 0 1 1 0 8 0 mbufpl 256 1133 0 0 71 0 71 71 0 8 0 bufpl 280 6377 0 211 441 0 441 441 0 8 0 anonpl 24 222309 0 214319 101 29 72 82 0 185 16 amapchunkpl 152 43020 0 42463 43 11 32 34 0 158 7 amappl16 200 4859 0 4624 51 35 16 29 0 8 0 amappl15 192 75 0 75 1 1 0 1 0 8 0 amappl14 184 128 0 117 1 0 1 1 0 8 0 amappl13 176 95 0 95 1 1 0 1 0 8 0 amappl12 168 2289 0 2260 4 1 3 3 0 8 0 amappl11 160 49 0 35 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 116 0 113 1 0 1 1 0 8 0 amappl7 128 123 0 112 1 0 1 1 0 8 0 amappl6 120 219 0 216 1 0 1 1 0 8 0 amappl5 112 137 0 126 1 0 1 1 0 8 0 amappl4 104 358 0 339 1 0 1 1 0 8 0 amappl3 96 8943 0 8835 4 0 4 4 0 8 0 amappl2 88 765 0 703 2 0 2 2 0 8 0 amappl1 80 13010 0 12464 14 0 14 14 0 8 0 amappl 88 12975 0 12806 5 0 5 5 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 dma512 512 1 0 1 1 0 1 1 0 8 1 dma256 256 7 0 7 2 1 1 1 0 8 1 dma128 128 254 0 254 2 1 1 1 0 8 1 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 40 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1576 0 1546 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1576 0 1546 1 0 1 1 0 8 0 vmmpekpl 168 13610 0 13562 3 0 3 3 0 8 0 vmmpepl 168 101826 0 99828 115 13 102 112 0 357 9 vmsppl 456 1575 0 1546 7 2 5 5 0 8 0 rwobjpl 64 32388 0 27837 75 0 75 75 0 8 0 pdppl 4096 3159 0 3092 115 44 71 85 0 8 4 pvpl 32 20662 0 0 168 1 167 167 0 265 0 pmappl 248 1575 0 1546 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 376 0 60 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff834e3ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff83670ef0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83670ef0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003ad889a0,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x71dbd5a9d6b0, count: -6 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:437 witness_checkorder(fffffd806e00ecc0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e00eca8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e00eca8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806e00f708,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806e00f708,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd805d51c2f8,ffff80003c590a50) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805d51c2f8,ffff80003c590a50) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd805d51c2f8,ffff80003c590a50) at fdrop+0x126 sys/kern/kern_descrip.c:1265 knote_remove(ffff80003c590a50,fffffd806ebde288,fffffd806ebde310,3,0) at knote_remove+0x403 sys/kern/kern_event.c:2014 knote_fdclose(ffff80003c590a50,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2049 fdrelease(ffff80003c590a50,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:749 syscall(ffff80003a982a40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a982a40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x24756ce3aa0, count: -13