login: witness: lock order reversal: 1st 0xfffffd807f7d1648 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806de0acc0 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83429102 -> 0xffffffff833a5512 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:536 #2 soreceive+0x28e sys/kern/uipc_socket.c:882 #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:1021 #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:438 witness_checkorder(fffffd806de0acc0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806de0aca8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806de0aca8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806de0ba68,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806de0ba68,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd805d2efc80,ffff80003c4d6560) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805d2efc80,ffff80003c4d6560) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd805d2efc80,ffff80003c4d6560) at fdrop+0x126 sys/kern/kern_descrip.c:1265 knote_drop(fffffd80629b54b0,ffff80003c4d6560) at knote_drop+0x1a1 sys/kern/kern_event.c:2142 knote_remove(ffff80003c4d6560,fffffd806ec2a000,fffffd806ec2a088,5,0) at knote_remove+0x239 sys/kern/kern_event.c:2025 knote_fdclose(ffff80003c4d6560,5) at knote_fdclose+0xf9 sys/kern/kern_event.c:2049 fdrelease(ffff80003c4d6560,5) at fdrelease+0xf9 sys/kern/kern_descrip.c:749 syscall(ffff80003c502db0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c502db0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc020e55810, count: -14 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c502850 rbx 0xfffffd800470c608 rdx 0xffff80000142bf00 rcx 0xffff80003c4d6560 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c502730 r9 0x8080808080808080 r10 0x72ee2a016c6463c8 r11 0x7f946a0eae1e2a9 r12 0 r13 0xfffffd8003f24f00 r14 0x3 r15 0xffffffff rip 0xffffffff810240e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c502840 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=123245 pid=54954 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=0xffff80003c4d7230,0xffffffff839eb828 process=0xffff8000ffff3740 user=0xffff80003c4fd000, vmspace=0xfffffd8009b161c8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 54954 28666 56573 0 3 0x80 fsleep syz-executor *54954 123245 56573 0 7 0x4000000 syz-executor 73816 157457 84224 0 3 0x80 fsleep syz-executor 73816 101139 84224 0 3 0x4000080 ttyin syz-executor 96463 97529 62132 0 3 0x80 fsleep syz-executor 96463 258613 62132 0 3 0x4000080 dtread syz-executor 15587 215579 87381 0 3 0x80 fsleep syz-executor 15587 101504 87381 0 3 0x4000080 kqsel syz-executor 93570 98911 5343 0 3 0x80 fsleep syz-executor 93570 349667 5343 0 3 0x4000080 fifor syz-executor 54462 375732 36074 0 3 0x80 fsleep syz-executor 54462 157728 36074 0 3 0x4000080 ttyin syz-executor 74747 447190 83105 0 3 0x80 fsleep syz-executor 74747 371806 83105 0 3 0x4000080 lockf syz-executor 56573 305149 85636 0 3 0x82 nanoslp syz-executor 84224 99596 85636 0 3 0x82 nanoslp syz-executor 85774 372823 0 0 3 0x14280 nfsidl nfsio 47129 170620 0 0 3 0x14280 nfsidl nfsio 17828 447283 0 0 3 0x14280 nfsidl nfsio 79922 167498 0 0 3 0x14280 nfsidl nfsio 65278 105622 0 0 3 0x14280 nfsidl nfsio 17597 77186 0 0 3 0x14280 nfsidl nfsio 7459 241560 0 0 3 0x14280 nfsidl nfsio 11126 478632 0 0 3 0x14280 nfsidl nfsio 76532 71627 0 0 3 0x14280 nfsidl nfsio 90780 144560 0 0 3 0x14280 nfsidl nfsio 19098 361510 0 0 3 0x14280 nfsidl nfsio 75377 373766 0 0 3 0x14280 nfsidl nfsio 66772 38874 0 0 3 0x14280 nfsidl nfsio 30428 321460 0 0 3 0x14280 nfsidl nfsio 94492 494910 0 0 3 0x14280 nfsidl nfsio 59242 315005 0 0 3 0x14280 nfsidl nfsio 97725 92154 0 0 3 0x14280 nfsidl nfsio 16871 78777 0 0 3 0x14280 nfsidl nfsio 48585 428038 0 0 3 0x14280 nfsidl nfsio 17211 199817 0 0 3 0x14280 nfsidl nfsio 21606 269546 1 0 3 0x100083 ttyin getty 20996 298188 0 0 3 0x14200 bored sosplice 72097 149351 0 0 3 0x14200 acct acct 87381 472291 85636 0 3 0x82 nanoslp syz-executor 36074 342353 85636 0 3 0x82 nanoslp syz-executor 62132 356557 85636 0 3 0x82 nanoslp syz-executor 83105 292565 85636 0 3 0x82 nanoslp syz-executor 5343 62462 85636 0 3 0x82 nanoslp syz-executor 6706 393049 85636 0 3 0x82 wait syz-executor 85636 365538 62766 0 3 0x82 kqread syz-executor 62766 55397 57324 0 3 0x10008a sigsusp ksh 57324 394409 23857 0 3 0x98 kqread sshd-session 23857 486727 52499 0 3 0x92 kqread sshd-session 52499 300100 1 0 3 0x88 kqread sshd 89277 211425 28822 74 3 0x1100092 bpf pflogd 28822 391073 1 0 3 0x80 sbwait pflogd 52301 220445 73573 73 3 0x1100090 kqread syslogd 73573 475355 1 0 3 0x100082 sbwait syslogd 63454 329501 1 0 3 0x100080 kqread resolvd 50910 310186 56066 77 3 0x100092 kqread dhcpleased 68723 514660 56066 77 3 0x100092 kqread dhcpleased 56066 31341 1 0 3 0x80 kqread dhcpleased 630 71709 0 0 3 0x14200 bored smr 14320 141548 0 0 3 0x14200 pgzero zerothread 18031 25959 0 0 3 0x14200 aiodoned aiodoned 62921 234389 0 0 3 0x14200 syncer update 65040 209397 0 0 3 0x14200 cleaner cleaner 84768 347468 0 0 3 0x14200 reaper reaper 7948 92568 0 0 3 0x14200 pgdaemon pagedaemon 40990 165021 0 0 3 0x14200 bored viomb 85680 266315 0 0 3 0x40014200 acpi0 acpi0 43417 395272 0 0 3 0x40014200 idle1 67444 193750 0 0 3 0x14200 bored softnet3 34372 183524 0 0 3 0x14200 bored softnet2 50813 264181 0 0 3 0x14200 bored softnet1 82807 206106 0 0 2 0x14200 softnet0 36945 23512 0 0 3 0x14200 bored systqmp 50652 507636 0 0 3 0x14200 bored systq 89434 241318 0 0 3 0x14200 tmoslp softclockmp 39100 234994 0 0 3 0x40014200 tmoslp softclock 54007 163580 0 0 7 0x40014200 idle0 1 181231 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 54954 (syz-executor) thread 0xffff80003c4d6560 (123245) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83906af8) #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_drop+0x1a1 sys/kern/kern_event.c:2142 #4 knote_remove+0x239 sys/kern/kern_event.c:2025 #5 knote_fdclose+0xf9 sys/kern/kern_event.c:2049 #6 fdrelease+0xf9 sys/kern/kern_descrip.c:749 #7 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #8 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd807f7d1648) #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 54462 (syz-executor) thread 0xffff80003c4d6a80 (157728) exclusive rrwlock inode r = 0 (0xfffffd806ddc4740) #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 spec_open+0x305 sys/kern/spec_vnops.c:151 #6 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #7 vn_open+0x708 sys/kern/vfs_vnops.c:177 #8 vndioctl+0xcb1 sys/dev/vnd.c:457 #9 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #11 sys_ioctl+0x5c3 #12 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10236 11149K 11474K 166960K 12632 0 pcb 18 15K 16K 166960K 182 0 rtable 201 9K 10K 166960K 513 0 pf 36 18K 21K 166960K 137 0 ifaddr 34 5K 7K 166960K 93 0 ifgroup 55 2K 2K 166960K 160 0 sysctl 2 1K 1K 166960K 2 0 counters 64 36K 37K 166960K 176 0 ioctlops 0 0K 4K 166960K 1594 0 iov 0 0K 24K 166960K 58 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1340 84K 85K 166960K 2083 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 5K 13K 166960K 18 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 101 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 106K 166960K 1063 0 sigio 0 0K 0K 166960K 12 0 proc 72 91K 140K 166960K 690 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 129 0 in_multi 66 4K 7K 166960K 147 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 211 943K 943K 166960K 211 0 exec 0 0K 1K 166960K 598 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 237 73K 91K 166960K 11387 0 UVM aobj 58 2K 2K 166960K 62 0 pinsyscall 43 86K 106K 166960K 2227 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 57 0 NDP 12 0K 2K 166960K 65 0 temp 77 8648K 8715K 166960K 69621 0 kqueue 14 22K 30K 166960K 216 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 91 0 88 1 0 1 1 0 8 0 rtentry 112 156 0 73 4 0 4 4 0 8 0 unpcb 144 885 0 865 9 4 5 6 0 8 4 syncache 336 9 0 9 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 489 0 484 21 15 6 11 0 8 5 arp 120 24 0 13 1 0 1 1 0 8 0 inpcb 376 1290 0 1280 19 14 5 12 0 8 3 nd6 136 36 0 17 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 2 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1168 40 0 40 2 1 1 1 0 8 1 pppxif 1472 4 0 4 2 2 0 1 0 8 0 pffrag 232 5 0 1 1 0 1 1 0 482 0 pffrnode 88 5 0 1 1 0 1 1 0 8 0 pffrent 40 6 0 2 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 4 0 3 2 1 1 1 0 8 0 pfanchor 1288 1 0 1 1 1 0 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 75 0 33 1 0 1 1 0 8 0 pfstkey 128 75 0 34 2 0 2 2 0 8 0 pfstate 376 74 0 33 6 0 6 6 0 8 0 pfrule 1344 31 0 24 2 1 1 2 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 621 0 271 34 8 26 29 0 8 0 art_table 32 625 0 271 4 0 4 4 0 8 0 art_node 16 150 0 74 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 10 1 0 1 1 0 8 0 semapl 112 99 0 89 1 0 1 1 0 8 0 shmpl 112 59 0 4 2 0 2 2 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 3250 0 1740 95 0 95 95 0 8 0 ffsino 280 3250 0 1740 109 0 109 109 0 8 0 nchpl 144 4716 0 3013 64 0 64 64 0 8 0 rtmask 32 11 0 11 2 2 0 1 0 8 0 uvmvnodes 80 3722 0 0 76 0 76 76 0 8 0 vnodes 216 3722 0 0 207 0 207 207 0 8 0 namei 1024 15871 0 15871 2 1 1 2 0 8 1 percpumem 16 102 0 56 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 88 0 64 3 1 2 3 0 8 0 scsiplug 72 5 0 5 1 1 0 1 0 8 0 scxspl 216 16340 0 16340 12 11 1 8 1 8 1 plimitpl 152 326 0 309 1 0 1 1 0 8 0 sigapl 424 1381 0 1309 11 2 9 9 0 8 0 futexpl 64 18686 0 18679 1 0 1 1 0 8 0 knotepl 120 557 0 0 17 0 17 17 0 8 0 kqueuepl 216 422 0 411 5 4 1 5 0 8 0 pipepl 328 195 0 168 3 0 3 3 0 8 0 fdescpl 504 1341 0 1309 5 0 5 5 0 8 0 filepl 152 8261 0 8032 24 6 18 19 0 8 8 lockfpl 104 223 0 217 1 0 1 1 0 8 0 lockfspl 48 99 0 94 1 0 1 1 0 8 0 sessionpl 144 32 0 23 1 0 1 1 0 8 0 pgrppl 48 121 0 104 1 0 1 1 0 8 0 ucredpl 104 1259 0 1245 1 0 1 1 0 8 0 zombiepl 144 1310 0 1309 1 0 1 1 0 8 0 processpl 1176 1381 0 1309 6 0 6 6 0 8 0 procpl 656 2804 0 2725 9 1 8 8 0 8 0 srpgc 96 10 0 10 2 2 0 1 0 8 0 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 688 2289 0 2257 29 18 11 17 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 35 0 0 4 0 4 4 0 8 0 mtagpl 96 127 0 0 4 0 4 4 0 8 0 mbufpl 256 304 0 0 19 0 19 19 0 8 0 bufpl 280 5082 0 136 354 0 354 354 0 8 0 anonpl 24 215031 0 206008 81 2 79 79 0 184 0 amapchunkpl 152 36823 0 36201 37 11 26 32 0 158 0 amappl16 200 5049 0 4785 32 6 26 27 0 8 0 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 130 0 118 1 0 1 1 0 8 0 amappl13 176 4 0 4 2 2 0 1 0 8 0 amappl12 168 2030 0 1998 4 2 2 3 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 21 0 21 1 1 0 1 0 8 0 amappl9 144 253 0 251 1 0 1 1 0 8 0 amappl8 136 27 0 24 1 0 1 1 0 8 0 amappl7 128 119 0 107 1 0 1 1 0 8 0 amappl6 120 204 0 200 1 0 1 1 0 8 0 amappl5 112 130 0 120 1 0 1 1 0 8 0 amappl4 104 347 0 328 1 0 1 1 0 8 0 amappl3 96 7370 0 7253 4 0 4 4 0 8 0 amappl2 88 729 0 667 2 0 2 2 0 8 0 amappl1 80 12166 0 11595 14 1 13 14 0 8 0 amappl 88 10920 0 10739 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma1024 1024 2 0 1 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 61 0 4 2 0 2 2 0 8 0 uaddrrnd 24 1341 0 1309 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1341 0 1309 1 0 1 1 0 8 0 vmmpekpl 168 12292 0 12243 3 0 3 3 0 8 0 vmmpepl 168 89414 0 87265 104 2 102 103 0 357 0 vmsppl 456 1340 0 1309 5 0 5 5 0 8 0 rwobjpl 64 30281 0 25328 80 0 80 80 0 8 0 pdppl 4096 2689 0 2618 101 30 71 83 0 8 0 pvpl 32 20371 0 0 165 1 164 164 0 265 0 pmappl 248 1340 0 1309 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 315 0 60 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(ffffffff8383aff0) 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(ffffffff839068f0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a2b5680,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff839068f0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) at __mp_lock+0x199 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffffffff8383aff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -11 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(fffffd806de0acc0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806de0aca8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806de0aca8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806de0ba68,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806de0ba68,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd805d2efc80,ffff80003c4d6560) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805d2efc80,ffff80003c4d6560) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd805d2efc80,ffff80003c4d6560) at fdrop+0x126 sys/kern/kern_descrip.c:1265 knote_drop(fffffd80629b54b0,ffff80003c4d6560) at knote_drop+0x1a1 sys/kern/kern_event.c:2142 knote_remove(ffff80003c4d6560,fffffd806ec2a000,fffffd806ec2a088,5,0) at knote_remove+0x239 sys/kern/kern_event.c:2025 knote_fdclose(ffff80003c4d6560,5) at knote_fdclose+0xf9 sys/kern/kern_event.c:2049 fdrelease(ffff80003c4d6560,5) at fdrelease+0xf9 sys/kern/kern_descrip.c:749 syscall(ffff80003c502db0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c502db0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc020e55810, count: -14