witness: lock order reversal: 1st 0xffff8000fffea8b0 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806fba4b20 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff8342cf5f -> 0xffffffff83425b61 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:783 #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:783 #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:438 witness_checkorder(fffffd806fba4b20,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806fba4b08,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806fba4b08,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd806fca90e8,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd806fca90e8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576 vn_closefile(fffffd8060c629d0,ffff8000fffe8d18) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd8060c629d0,ffff8000fffe8d18) at vn_closefile+0x111 sys/kern/vfs_vnops.c:621 fdrop(fffffd8060c629d0,ffff8000fffe8d18) at fdrop+0x121 sys/kern/kern_descrip.c:1281 knote_drop(fffffd806715a6a8,ffff8000fffe8d18) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff8000fffe8d18,fffffd806f4567e0,fffffd806f456870,3,0) at knote_remove+0x215 sys/kern/kern_event.c:-1 knote_fdclose(ffff8000fffe8d18,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff8000fffe8d18,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:761 syscall(ffff80003c433200) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c433200) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xae2c008c320, count: -14 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c432cc0 rbx 0 rdx 0 rcx 0xffff8000fffe8d18 rax 0xffff8000299bdff0 r8 0xffff80003c432ba0 r9 0x8080808080808080 r10 0x7738f250ffa0a705 r11 0x6553aab68203a9b9 r12 0xfffffd8004039d00 r13 0xfffffd80048269b0 r14 0x3 r15 0xffffffff834b960d substchar+0x6684 rip 0xffffffff82a61865 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c432cb0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=342802 pid=34802 tcnt=2 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=0xffff8000fffe82b8,0xffffffff839afac0 process=0xffff8000fffe5d00 user=0xffff80003c42e000, vmspace=0xfffffd806c6493f0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 34802 111953 19392 0 7 0 syz-executor *34802 342802 19392 0 7 0x4000000 syz-executor 53275 342777 93592 0 3 0x80 nanoslp syz-executor 53275 226188 93592 0 3 0x4000080 fsleep syz-executor 53275 522021 93592 0 3 0x4000080 fsleep syz-executor 53275 430726 93592 0 3 0x4000080 fsleep syz-executor 74129 300406 91440 0 2 0 syz-executor 74129 503122 91440 0 3 0x4000080 fsleep syz-executor 74129 503503 91440 0 3 0x4000080 fsleep syz-executor 74129 374916 91440 0 3 0x4000080 fsleep syz-executor 11403 514052 83104 60929 2 0x10 syz-executor 11403 504501 83104 60929 3 0x4000090 ttyretype syz-executor 62620 207648 83986 0 2 0 syz-executor 62620 322331 83986 0 3 0x4000080 fsleep syz-executor 74984 488296 1835 0 3 0x80 nanoslp syz-executor 74984 484341 1835 0 3 0x4000080 sbwait syz-executor 74984 3373 1835 0 3 0x4000080 fsleep syz-executor 74984 104977 1835 0 3 0x4000080 fsleep syz-executor 25803 71186 71208 0 2 0 syz-executor 25803 193113 71208 0 3 0x4000000 biowait syz-executor 25803 109404 71208 0 3 0x4000000 inode syz-executor 25803 523460 71208 0 3 0x4000080 fsleep syz-executor 72209 186551 11666 0 3 0x100082 sbwait ndp 11666 486631 26955 0 3 0x10008a sigsusp sh 91440 475861 64977 0 3 0x82 nanoslp syz-executor 83986 282242 64977 0 3 0x82 nanoslp syz-executor 83104 119882 64977 0 3 0x82 nanoslp syz-executor 71208 123778 64977 0 3 0x82 nanoslp syz-executor 19392 262065 64977 0 3 0x82 nanoslp syz-executor 93592 507696 64977 0 3 0x82 nanoslp syz-executor 26955 412516 64977 0 3 0x82 wait syz-executor 1835 183144 64977 0 3 0x82 nanoslp syz-executor 64977 500514 73794 0 3 0x82 kqread syz-executor 73794 444566 1158 0 3 0x10008a sigsusp ksh 1158 501524 23576 0 3 0x98 kqread sshd-session 23576 243554 16430 0 3 0x92 kqread sshd-session 2062 397127 1 0 3 0x100083 ttyin getty 16430 84310 1 0 3 0x88 kqread sshd 30824 321014 8676 74 3 0x1100092 bpf pflogd 8676 429880 1 0 3 0x80 sbwait pflogd 13722 118227 85535 73 3 0x1100090 kqread syslogd 85535 496351 1 0 3 0x100082 sbwait syslogd 9792 221877 1 0 3 0x100080 kqread resolvd 87730 333127 86294 77 3 0x100092 kqread dhcpleased 65159 312363 86294 77 3 0x100092 kqread dhcpleased 86294 385381 1 0 3 0x80 kqread dhcpleased 7751 236716 0 0 3 0x14200 bored smr 99050 305002 0 0 3 0x14200 pgzero zerothread 48035 113613 0 0 3 0x14200 aiodoned aiodoned 26106 437509 0 0 3 0x14200 syncer update 12057 513845 0 0 3 0x14200 cleaner cleaner 92002 82897 0 0 3 0x14200 reaper reaper 80083 330533 0 0 3 0x14200 pgdaemon pagedaemon 46998 122565 0 0 3 0x14200 bored viomb 24003 222822 0 0 3 0x40014200 acpi0 acpi0 56117 15032 0 0 3 0x40014200 idle1 98320 14148 0 0 3 0x14200 bored softnet1 2196 187016 0 0 2 0x14200 softnet0 55929 116695 0 0 3 0x14200 bored systqmp 34301 99739 0 0 3 0x14200 bored systq 60422 436941 0 0 3 0x14200 tmoslp softclockmp 75753 460492 0 0 3 0x40014200 tmoslp softclock 54781 118964 0 0 3 0x40014200 idle0 1 359185 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 34802 (syz-executor) thread 0xffff8000fffe8d18 (342802) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a81100) #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_drop+0x1a1 sys/kern/kern_event.c:2296 #4 knote_remove+0x215 sys/kern/kern_event.c:-1 #5 knote_fdclose+0xf9 sys/kern/kern_event.c:2203 #6 fdrelease+0xf9 sys/kern/kern_descrip.c:761 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #8 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xffff8000fffea8b0) #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:783 #4 Xsyscall+0x128 Process 25803 (syz-executor) thread 0xffff80003c3f27f0 (193113) exclusive rrwlock inode r = 0 (0xfffffd806c59bc58) #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 vn_write+0x18f sys/kern/vfs_vnops.c:411 #6 dofilewritev+0x2bd sys/kern/sys_generic.c:384 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11060 12086K 12308K 166960K 12400 0 pcb 50 14K 14K 166960K 138 0 rtable 253 8K 8K 166960K 400 0 pf 38 18K 26K 166960K 118 0 ifaddr 44 7K 8K 166960K 53 0 ifgroup 58 2K 2K 166960K 74 0 sysctl 3 1K 9K 166960K 8 0 counters 70 37K 37K 166960K 82 0 ioctlops 0 0K 4K 166960K 1591 0 iov 0 0K 12K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1382 87K 87K 166960K 1717 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 21 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 114K 166960K 386 0 sigio 0 0K 0K 166960K 4 0 proc 72 115K 164K 166960K 581 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 168 0 in_multi 103 7K 7K 166960K 112 0 ether_multi 1 0K 0K 166960K 4 0 mrt 2 0K 0K 166960K 15 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 410 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 262 162K 179K 166960K 5383 0 UVM aobj 40 2K 2K 166960K 41 0 pinsyscall 45 90K 104K 166960K 1549 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 11 0 NDP 12 0K 2K 166960K 34 0 temp 59 9083K 9148K 166960K 15013 0 kqueue 15 24K 30K 166960K 63 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 43 0 39 1 0 1 1 0 8 0 rtentry 176 124 0 10 6 0 6 6 0 8 0 unpcb 144 298 0 279 2 0 2 2 0 8 1 syncache 336 7 0 7 2 1 1 1 0 8 1 tcpcb 736 70 0 66 1 0 1 1 0 8 0 arp 136 20 0 2 1 0 1 1 0 8 0 inpcb 328 382 0 338 4 0 4 4 0 8 0 nd6 152 27 0 1 2 0 2 2 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 4 0 4 1 0 1 1 0 8 1 pfstscr 40 4 0 2 1 0 1 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 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 pfanchor 1288 5 0 0 1 0 1 1 0 8 0 pfstitem 24 55 0 1 1 0 1 1 0 8 0 pfstkey 128 57 0 3 2 0 2 2 0 8 0 pfstate 448 53 0 2 6 0 6 6 0 8 0 pfrule 1360 29 0 24 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 499 0 24 32 0 32 32 0 8 0 art_table 40 501 0 24 6 0 6 6 0 8 0 art_node 32 124 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 38 0 1 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2081 0 623 93 0 93 93 0 8 0 ffsino 296 2081 0 623 114 0 114 114 0 8 0 nchpl 144 2617 0 912 64 0 64 64 0 8 0 vnodes 216 2380 0 0 133 0 133 133 0 8 0 namei 1024 8424 0 8424 2 1 1 1 0 8 1 percpumem 16 56 0 6 1 0 1 1 0 8 0 kstatmem 264 37 0 10 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 8582 0 8581 11 3 8 8 1 8 7 plimitpl 152 153 0 132 1 0 1 1 0 8 0 sigapl 424 698 0 649 7 0 7 7 0 8 1 knotepl 120 521 0 0 16 0 16 16 0 8 0 kqueuepl 224 81 0 69 1 0 1 1 0 8 0 pipepl 344 137 0 110 3 0 3 3 0 8 0 fdescpl 528 682 0 649 3 0 3 3 0 8 0 filepl 160 3577 0 3219 15 0 15 15 0 8 0 lockfpl 104 236 0 231 1 0 1 1 0 8 0 lockfspl 48 89 0 86 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 43 0 26 1 0 1 1 0 8 0 ucredpl 104 538 0 524 1 0 1 1 0 8 0 zombiepl 144 649 0 649 2 1 1 1 0 8 1 processpl 1232 698 0 649 5 0 5 5 0 8 0 procpl 664 1116 0 1052 6 0 6 6 0 8 0 sosppl 176 4 0 4 1 0 1 1 0 8 1 sockpl 752 731 0 664 10 0 10 10 0 8 3 mcl64k 65536 4 0 0 1 0 1 1 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 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 184 0 0 12 0 12 12 0 8 0 bufpl 280 2754 0 106 190 0 190 190 0 8 0 anonpl 32 7610 0 0 62 0 62 62 0 246 0 amapchunkpl 152 16382 0 15829 27 0 27 27 0 158 5 amappl16 200 2362 0 2321 18 8 10 15 0 8 7 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 445 0 443 1 0 1 1 0 8 0 amappl13 176 132 0 119 1 0 1 1 0 8 0 amappl12 168 934 0 902 2 0 2 2 0 8 0 amappl11 160 36 0 36 1 1 0 1 0 8 0 amappl10 152 96 0 82 1 0 1 1 0 8 0 amappl9 144 279 0 279 1 1 0 1 0 8 0 amappl8 136 129 0 126 1 0 1 1 0 8 0 amappl7 128 152 0 138 1 0 1 1 0 8 0 amappl6 120 170 0 167 1 0 1 1 0 8 0 amappl5 112 102 0 92 1 0 1 1 0 8 0 amappl4 104 311 0 287 1 0 1 1 0 8 0 amappl3 96 3106 0 2976 4 0 4 4 0 8 0 amappl2 88 562 0 499 2 0 2 2 0 8 0 amappl1 80 11710 0 11071 17 0 17 17 0 8 2 amappl 88 4580 0 4397 5 0 5 5 0 92 0 uvmvnodes 80 104 0 0 3 0 3 3 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 128 254 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 24 682 0 649 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 682 0 649 1 0 1 1 0 8 0 vmmpekpl 168 7696 0 7663 3 0 3 3 0 8 1 vmmpepl 168 53183 0 51137 100 0 100 100 0 357 9 vmsppl 488 681 0 649 5 0 5 5 0 8 0 rwobjpl 80 18053 0 16887 28 0 28 28 0 8 1 pdppl 4096 1371 0 1298 107 34 73 85 0 8 0 pvpl 32 14116 0 0 114 0 114 114 0 265 0 pmappl 256 681 0 649 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 289 0 39 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8389dff0) 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(ffffffff83a80900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a80900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c42d370,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83a80900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a80900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c42d4d0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x77a9b0ac1060, count: -9 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(fffffd806fba4b20,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806fba4b08,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806fba4b08,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd806fca90e8,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd806fca90e8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576 vn_closefile(fffffd8060c629d0,ffff8000fffe8d18) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd8060c629d0,ffff8000fffe8d18) at vn_closefile+0x111 sys/kern/vfs_vnops.c:621 fdrop(fffffd8060c629d0,ffff8000fffe8d18) at fdrop+0x121 sys/kern/kern_descrip.c:1281 knote_drop(fffffd806715a6a8,ffff8000fffe8d18) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff8000fffe8d18,fffffd806f4567e0,fffffd806f456870,3,0) at knote_remove+0x215 sys/kern/kern_event.c:-1 knote_fdclose(ffff8000fffe8d18,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff8000fffe8d18,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:761 syscall(ffff80003c433200) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c433200) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xae2c008c320, count: -14