witness: lock order reversal: 1st 0xffff8000337e0ee0 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806ff9eb20 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff833876ff -> 0xffffffff8337cf4c 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:878 #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:531 #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:765 #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:1017 #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:765 #6 Xsyscall+0x128 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffd806ff9eb20,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806ff9eb08,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806ff9eb08,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd80700b00e8,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd80700b00e8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd806a4e4448,ffff8000337e34e0) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806a4e4448,ffff8000337e34e0) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd806a4e4448,ffff8000337e34e0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 knote_drop(fffffd806accf4b8,ffff8000337e34e0) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff8000337e34e0,fffffd806f7707e0,fffffd806f770870,3,0) at knote_remove+0x2f6 sys/kern/kern_event.c:2180 knote_fdclose(ffff8000337e34e0,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff8000337e34e0,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:760 syscall(ffff80003c426690) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c426690) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa0348b499a0, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c426160 rbx 0 rdx 0xffff800001477e40 rcx 0xffff8000337e34e0 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c426040 r9 0x8080808080808080 r10 0x34e9d0a063091fa8 r11 0x766d24dada784d39 r12 0xfffffd8003f44d00 r13 0xfffffd8004731928 r14 0x3 r15 0xffffffff8341b3a6 substchar+0xb225 rip 0xffffffff81a65315 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c426150 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=316424 pid=13938 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=0xffff8000fffea028,0xffff8000337e3a20 process=0xffff8000367ef040 user=0xffff80003c421000, vmspace=0xfffffd806cb087b8 estcpu=3, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 13938 416119 27005 0 7 0 syz-executor *13938 316424 27005 0 7 0x4000000 syz-executor 13938 178327 27005 0 2 0x4000080 syz-executor 91296 212728 291 0 2 0 syz-executor 91296 288331 291 0 3 0x4000080 kqpoll syz-executor 91296 411060 291 0 2 0x4000000 syz-executor 91296 240752 291 0 3 0x4000080 fsleep syz-executor 3436 20115 74183 0 3 0x80 nanoslp syz-executor 3436 98995 74183 0 3 0x4000080 kqsel syz-executor 3436 249331 74183 0 3 0x4000080 fsleep syz-executor 3436 442240 74183 0 3 0x4000080 fsleep syz-executor 73101 10790 9582 0 3 0x80 fsleep syz-executor 73101 42618 9582 0 3 0x4000080 sbwait syz-executor 34553 360489 41412 0 3 0x80 fsleep syz-executor 34553 65575 41412 0 3 0x4000080 fifor syz-executor 35462 165284 1 0 3 0x100083 ttyopn getty 41412 390072 75782 0 3 0x82 nanoslp syz-executor 74183 73587 75782 0 3 0x82 nanoslp syz-executor 27005 386106 75782 0 3 0x82 nanoslp syz-executor 291 297051 75782 0 3 0x82 nanoslp syz-executor 56779 515676 75782 0 3 0x82 piperd syz-executor 70600 97018 75782 0 3 0x2 biowait syz-executor 59029 99949 75782 0 3 0x82 wait syz-executor 9582 288612 75782 0 3 0x82 nanoslp syz-executor 75782 475152 31983 0 3 0x82 nanoslp syz-executor 31983 185468 16787 0 3 0x10008a sigsusp ksh 16787 170512 2043 0 3 0x98 kqread sshd-session 2043 141751 56623 0 3 0x92 kqread sshd-session 56623 467716 1 0 3 0x88 kqread sshd 17365 259996 86776 74 3 0x1100092 bpf pflogd 86776 286529 1 0 3 0x80 sbwait pflogd 38275 456285 39020 73 3 0x1100090 kqread syslogd 39020 223180 1 0 3 0x100082 sbwait syslogd 11809 148356 1 0 3 0x100080 kqread resolvd 77279 301260 7781 77 3 0x100092 kqread dhcpleased 133 426398 7781 77 3 0x100092 kqread dhcpleased 7781 60385 1 0 3 0x80 kqread dhcpleased 26668 21219 0 0 3 0x14200 bored smr 24810 227759 0 0 2 0x14200 zerothread 86889 278931 0 0 3 0x14200 aiodoned aiodoned 63952 410323 0 0 3 0x14200 syncer update 13739 272956 0 0 3 0x14200 cleaner cleaner 33587 519000 0 0 3 0x14200 reaper reaper 13538 470843 0 0 3 0x14200 pgdaemon pagedaemon 51807 119585 0 0 3 0x14200 bored viomb 51532 71537 0 0 3 0x40014200 acpi0 acpi0 93889 116096 0 0 3 0x40014200 idle1 28828 514897 0 0 3 0x14200 bored softnet1 78395 491938 0 0 3 0x14200 bored softnet0 70252 376423 0 0 3 0x14200 bored systqmp 7593 198791 0 0 3 0x14200 bored systq 52421 372657 0 0 3 0x14200 tmoslp softclockmp 85195 427462 0 0 3 0x40014200 tmoslp softclock 95017 410508 0 0 3 0x40014200 idle0 1 148607 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 13938 (syz-executor) thread 0xffff8000337e34e0 (316424) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8393c170) #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:608 #2 fdrop+0x121 sys/kern/kern_descrip.c:1280 #3 knote_drop+0x1a1 sys/kern/kern_event.c:2296 #4 knote_remove+0x2f6 sys/kern/kern_event.c:2180 #5 knote_fdclose+0xf9 sys/kern/kern_event.c:2203 #6 fdrelease+0xf9 sys/kern/kern_descrip.c:760 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #8 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xffff8000337e0ee0) #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:778 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #4 Xsyscall+0x128 Process 70600 (syz-executor) thread 0xffff8000ffffcd00 (97018) exclusive rrwlock inode r = 0 (0xfffffd806ad73d98) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ebfba58) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #13 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10193 11030K 12468K 166960K 12196 0 pcb 18 18K 21K 166960K 201 0 rtable 188 6K 8K 166960K 462 0 pf 30 16K 18K 166960K 72 0 ifaddr 35 6K 8K 166960K 67 0 ifgroup 47 2K 2K 166960K 90 0 sysctl 4 1K 9K 166960K 10 0 counters 64 36K 37K 166960K 100 0 ioctlops 0 0K 4K 166960K 1567 0 iov 0 0K 24K 166960K 87 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1464 92K 92K 166960K 1888 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 14 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 16 57K 97K 166960K 529 0 sigio 0 0K 0K 166960K 7 0 proc 72 115K 164K 166960K 596 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 50 0 in_multi 77 5K 7K 166960K 139 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 512 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 241 182K 185K 166960K 6444 0 UVM aobj 10 4K 4K 166960K 16 0 pinsyscall 41 82K 104K 166960K 1683 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 16 0 NDP 10 0K 2K 166960K 43 0 temp 60 8665K 8774K 166960K 20369 0 kqueue 14 22K 28K 166960K 89 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 61 0 58 1 0 1 1 0 8 0 rtentry 176 142 0 61 6 0 6 6 0 8 0 unpcb 144 284 0 261 3 1 2 3 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 127 0 123 4 3 1 4 0 8 0 arp 136 21 0 7 1 0 1 1 0 8 0 inpcb 328 618 0 609 12 8 4 10 0 8 3 nd6 152 28 0 10 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 12 0 12 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 0 1 1 0 8 1 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 2 0 0 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 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfstitem 24 46 0 12 1 0 1 1 0 8 0 pfstkey 128 46 0 12 2 0 2 2 0 8 0 pfstate 448 46 0 12 5 0 5 5 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 559 0 228 29 4 25 29 0 8 2 art_table 40 562 0 228 5 0 5 5 0 8 0 art_node 32 141 0 68 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semapl 112 19 0 9 1 0 1 1 0 8 0 shmpl 112 12 0 6 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2313 0 801 96 0 96 96 0 8 0 ffsino 296 2313 0 801 117 0 117 117 0 8 0 nchpl 144 3007 0 1300 64 0 64 64 0 8 0 vnodes 216 2739 0 0 153 0 153 153 0 8 0 namei 1024 9754 0 9754 1 0 1 1 0 8 1 percpumem 16 65 0 18 1 0 1 1 0 8 0 vcpupl 3968 1 0 0 1 0 1 1 0 8 0 vmpool 840 1 0 0 1 0 1 1 0 8 0 kstatmem 264 50 0 28 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 12414 0 12413 9 8 1 8 1 8 0 plimitpl 152 110 0 93 1 0 1 1 0 8 0 sigapl 424 836 0 790 7 1 6 7 0 8 0 knotepl 120 524 0 0 16 0 16 16 0 8 0 kqueuepl 224 163 0 151 3 2 1 3 0 8 0 pipepl 344 212 0 185 9 6 3 9 0 8 0 fdescpl 528 820 0 790 3 0 3 3 0 8 0 filepl 160 4474 0 4252 19 8 11 19 0 8 0 lockfpl 104 144 0 142 1 0 1 1 0 8 0 lockfspl 48 63 0 61 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 594 0 581 1 0 1 1 0 8 0 zombiepl 144 791 0 790 1 0 1 1 0 8 0 processpl 1232 836 0 790 5 0 5 5 0 8 0 procpl 664 1413 0 1357 6 0 6 6 0 8 0 sosppl 176 3 0 3 1 0 1 1 0 8 1 sockpl 752 974 0 939 20 13 7 18 0 8 3 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 8 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 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 78 0 0 2 0 2 2 0 8 0 mbufpl 256 1244 0 0 78 0 78 78 0 8 0 bufpl 280 4463 0 132 310 0 310 310 0 8 0 anonpl 32 7731 0 0 63 0 63 63 0 246 0 amapchunkpl 152 20725 0 20073 38 7 31 32 0 158 4 amappl16 200 2824 0 2715 17 11 6 15 0 8 0 amappl15 192 26 0 26 1 1 0 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 435 0 434 1 0 1 1 0 8 0 amappl12 168 1186 0 1145 3 0 3 3 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 63 0 49 1 0 1 1 0 8 0 amappl9 144 272 0 271 1 0 1 1 0 8 0 amappl8 136 30 0 27 1 0 1 1 0 8 0 amappl7 128 85 0 84 1 0 1 1 0 8 0 amappl6 120 322 0 309 1 0 1 1 0 8 0 amappl5 112 86 0 75 1 0 1 1 0 8 0 amappl4 104 420 0 390 1 0 1 1 0 8 0 amappl3 96 3507 0 3420 4 1 3 3 0 8 0 amappl2 88 939 0 865 2 0 2 2 0 8 0 amappl1 80 10719 0 10132 14 1 13 14 0 8 0 amappl 88 5622 0 5463 5 0 5 5 0 92 0 uvmvnodes 80 112 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 128 253 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 15 0 6 1 0 1 1 0 8 0 uaddrrnd 24 820 0 790 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 820 0 790 1 0 1 1 0 8 0 vmmpekpl 168 8300 0 8257 3 0 3 3 0 8 0 vmmpepl 168 58882 0 56932 97 6 91 97 0 357 2 vmsppl 488 819 0 790 5 1 4 5 0 8 0 rwobjpl 80 18277 0 17160 28 4 24 27 0 8 0 pdppl 4096 1649 0 1581 102 30 72 87 0 8 4 pvpl 32 16222 0 0 132 1 131 131 0 265 0 pmappl 256 820 0 790 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 350 0 40 10 0 10 10 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffd806ff9eb20,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806ff9eb08,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806ff9eb08,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd80700b00e8,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd80700b00e8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd806a4e4448,ffff8000337e34e0) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806a4e4448,ffff8000337e34e0) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd806a4e4448,ffff8000337e34e0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 knote_drop(fffffd806accf4b8,ffff8000337e34e0) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff8000337e34e0,fffffd806f7707e0,fffffd806f770870,3,0) at knote_remove+0x2f6 sys/kern/kern_event.c:2180 knote_fdclose(ffff8000337e34e0,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff8000337e34e0,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:760 syscall(ffff80003c426690) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c426690) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa0348b499a0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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(ffffffff8393bf68) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8393bf68) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff8000313def00) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000313def00) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d567f4bbb60, count: -6