witness: lock order reversal: 1st 0xffff800010fd5750 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806b54f500 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff833fd222 -> 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] sbufsnd (&so->so_snd.sb_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 sblock+0xb7 sys/kern/uipc_socket2.c:536 #2 sosplice+0x40d sys/kern/uipc_socket.c:1364 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1221 #4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #5 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(fffffd806b54f500,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806b54f4e8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806b54f4e8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8062ea97e0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8062ea97e0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff8000344b9fb8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff8000344b9fb8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fd5590,fffffd806b6ac900,ffff80003c4f6a70) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800010fd5590,fffffd8061040e00,fffffd806b6ac900,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800010fd5590,fffffd806b6ac900,ffff8000344ba238,0,0,0) at sosend+0x804 sendit(ffff80003c4f6a70,4,ffff8000344ba3b0,0,ffff8000344ba470) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80003c4f6a70,ffff8000344ba520,ffff8000344ba470) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff8000344ba520) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000344ba520) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e4433c0960, count: -15 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff8000344b9c30 rbx 0xfffffd800470d130 rdx 0xffff800001457dc0 rcx 0xffff80003c4f6a70 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff8000344b9b10 r9 0x8080808080808080 r10 0x40acbb951c7d96c6 r11 0xab9f813ce7316e69 r12 0 r13 0xfffffd8003f24f00 r14 0x3 r15 0xffffffff rip 0xffffffff810240e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000344b9c20 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=169522 pid=58145 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=82, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a33af80,0xffff80003c4f74c0 process=0xffff8000ffff72a8 user=0xffff8000344b5000, vmspace=0xfffffd806be69ac8 estcpu=32, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 68232 370115 48871 0 2 0 syz-executor 68232 427380 48871 0 3 0x4000080 fsleep syz-executor 50240 453821 31575 0 2 0 syz-executor 22250 370211 83079 0 2 0 syz-executor 99005 171694 11992 0 2 0 syz-executor 99005 491328 11992 0 3 0x4000080 fsleep syz-executor 99005 70802 11992 0 3 0x4000080 fsleep syz-executor 58145 340944 12963 0 2 0 syz-executor *58145 169522 12963 0 7 0x4000000 syz-executor 58145 160970 12963 0 3 0x4000080 fsleep syz-executor 35043 353921 82325 0 2 0 syz-executor 35043 79819 82325 0 3 0x4000080 fsleep syz-executor 52377 383678 55318 0 7 0 syz-executor 52377 50998 55318 0 3 0x4000080 ttyout syz-executor 41397 171405 86207 0 2 0 syz-executor 41397 395788 86207 0 2 0x4000000 syz-executor 7625 202842 0 0 3 0x14200 bored sosplice 57919 173111 0 0 3 0x14280 nfsidl nfsio 45418 300078 0 0 3 0x14280 nfsidl nfsio 32597 501227 0 0 3 0x14280 nfsidl nfsio 70236 381613 0 0 3 0x14280 nfsidl nfsio 64969 253783 0 0 3 0x14280 nfsidl nfsio 78685 396708 0 0 3 0x14280 nfsidl nfsio 59522 400905 0 0 3 0x14280 nfsidl nfsio 20950 391569 0 0 3 0x14280 nfsidl nfsio 31861 65571 0 0 3 0x14280 nfsidl nfsio 87663 213177 0 0 3 0x14280 nfsidl nfsio 11147 85310 0 0 3 0x14280 nfsidl nfsio 38487 319153 0 0 3 0x14280 nfsidl nfsio 94252 262814 0 0 3 0x14280 nfsidl nfsio 25510 331023 0 0 3 0x14280 nfsidl nfsio 54470 216064 0 0 3 0x14280 nfsidl nfsio 5974 38322 0 0 3 0x14280 nfsidl nfsio 90699 414345 0 0 3 0x14280 nfsidl nfsio 44692 378862 0 0 3 0x14280 nfsidl nfsio 37731 152565 0 0 3 0x14280 nfsidl nfsio 59233 33122 0 0 3 0x14280 nfsidl nfsio 12963 293926 81519 0 3 0x82 nanoslp syz-executor 83079 296079 81519 0 3 0x82 nanoslp syz-executor 86207 417497 81519 0 3 0x82 nanoslp syz-executor 48871 221804 81519 0 3 0x82 nanoslp syz-executor 31575 215638 81519 0 3 0x82 nanoslp syz-executor 55318 203074 81519 0 3 0x82 nanoslp syz-executor 11992 446286 81519 0 3 0x82 nanoslp syz-executor 82325 502443 81519 0 3 0x82 nanoslp syz-executor 81519 291505 64974 0 3 0x82 kqread syz-executor 64974 437377 95026 0 3 0x10008a sigsusp ksh 95026 285596 15931 0 3 0x98 kqread sshd-session 15931 109678 37515 0 3 0x92 kqread sshd-session 84776 199237 1 0 3 0x100083 ttyin getty 37515 237051 1 0 3 0x88 kqread sshd 80364 447945 59734 74 3 0x1100092 bpf pflogd 59734 351520 1 0 3 0x80 sbwait pflogd 64539 194914 99076 73 3 0x1100090 kqread syslogd 99076 37459 1 0 3 0x100082 sbwait syslogd 3948 1179 1 0 3 0x100080 kqread resolvd 89271 387481 88520 77 3 0x100092 kqread dhcpleased 21526 394016 88520 77 3 0x100092 kqread dhcpleased 88520 418384 1 0 3 0x80 kqread dhcpleased 34223 84746 0 0 3 0x14200 bored smr 75505 239059 0 0 2 0x14200 zerothread 54551 128550 0 0 3 0x14200 aiodoned aiodoned 86280 30076 0 0 3 0x14200 syncer update 50862 15769 0 0 3 0x14200 cleaner cleaner 94128 507284 0 0 3 0x14200 reaper reaper 98371 148173 0 0 3 0x14200 pgdaemon pagedaemon 39436 222930 0 0 3 0x14200 bored viomb 94 507015 0 0 3 0x40014200 acpi0 acpi0 25785 291628 0 0 3 0x40014200 idle1 92029 451126 0 0 3 0x14200 bored softnet3 32875 297974 0 0 3 0x14200 bored softnet2 30775 104993 0 0 3 0x14200 bored softnet1 59195 279471 0 0 2 0x14200 softnet0 94826 358789 0 0 3 0x14200 bored systqmp 57493 333811 0 0 3 0x14200 bored systq 26172 257813 0 0 3 0x14200 tmoslp softclockmp 39535 66110 0 0 3 0x40014200 tmoslp softclock 64686 75198 0 0 3 0x40014200 idle0 1 101198 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 58145 (syz-executor) thread 0xffff80003c4f6a70 (169522) 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 __mp_acquire_count+0x58 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 pool_get+0x265 sys/kern/subr_pool.c:593 #5 namei+0xdf sys/kern/vfs_lookup.c:145 #6 unp_connect+0x27d sys/kern/uipc_usrreq.c:868 #7 uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 #8 sosend+0x804 #9 sendit+0x721 sys/kern/uipc_syscalls.c:779 #10 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 #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 exclusive rwlock sbufsnd r = 0 (0xffff800010fd5750) #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 sblock+0xb7 sys/kern/uipc_socket2.c:536 #3 sosend+0x2e2 sys/kern/uipc_socket.c:631 #4 sendit+0x721 sys/kern/uipc_syscalls.c:779 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 #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 Process 41397 (syz-executor) thread 0xffff80002a33a540 (395788) exclusive rrwlock inode r = 0 (0xfffffd806b54f730) #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 domknodat+0xb4 sys/kern/vfs_syscalls.c:1590 #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 10224 11035K 11877K 166960K 12902 0 pcb 17 17K 18K 166960K 228 0 rtable 183 8K 9K 166960K 474 0 pf 38 18K 26K 166960K 174 0 ifaddr 35 5K 7K 166960K 102 0 ifgroup 58 2K 3K 166960K 180 0 sysctl 4 1K 1K 166960K 4 0 counters 64 36K 37K 166960K 192 0 ioctlops 0 0K 5K 166960K 1622 0 iov 0 0K 16K 166960K 98 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1362 86K 86K 166960K 2245 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 34 0 dirhash 12 2K 2K 166960K 42 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 1031 0 sigio 0 0K 0K 166960K 16 0 proc 74 91K 140K 166960K 628 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 0 0K 0K 166960K 97 0 in_multi 67 5K 7K 166960K 139 0 ether_multi 1 0K 0K 166960K 10 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 472 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 221 72K 86K 166960K 11101 0 UVM aobj 13 2K 4K 166960K 15 0 pinsyscall 43 86K 107K 166960K 2119 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 59 0 NDP 13 0K 2K 166960K 73 0 temp 76 8648K 8768K 166960K 27771 0 kqueue 13 20K 28K 166960K 202 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 120 106 0 103 1 0 1 1 0 8 0 rtentry 112 136 0 60 4 0 4 4 0 8 0 unpcb 144 626 0 607 4 3 1 2 0 8 0 syncache 336 6 0 6 2 2 0 1 0 8 0 tcpcb 808 288 0 284 7 6 1 7 0 8 0 arp 120 19 0 4 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 2 0 2 1 1 0 1 0 8 0 inpcb 376 1407 0 1399 25 23 2 15 0 8 0 nd6 136 30 0 12 1 0 1 1 0 8 0 pkpcb 40 7 0 7 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 52 0 52 1 1 0 1 0 8 0 pppxif 1472 5 0 5 1 1 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 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 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 pfstitem 24 78 0 25 1 0 1 1 0 8 0 pfstkey 128 82 0 29 2 0 2 2 0 8 0 pfstate 376 79 0 27 6 0 6 6 0 8 0 pfrule 1344 29 0 24 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 607 0 274 30 7 23 29 0 8 0 art_table 32 610 0 274 4 0 4 4 0 8 0 art_node 16 131 0 62 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semapl 112 32 0 22 1 0 1 1 0 8 0 shmpl 112 12 0 2 1 0 1 1 0 8 0 dirhash 1024 37 0 20 3 0 3 3 0 8 0 dino2pl 256 3408 0 1913 95 0 95 95 0 8 0 ffsino 280 3409 0 1913 109 0 109 109 0 8 0 nchpl 144 4852 0 3167 63 0 63 63 0 8 0 rtmask 32 14 0 14 2 2 0 1 0 8 0 uvmvnodes 80 3929 0 0 81 0 81 81 0 8 0 vnodes 216 3929 0 0 219 0 219 219 0 8 0 namei 1024 15625 0 15623 3 2 1 2 0 8 0 percpumem 16 110 0 64 1 0 1 1 0 8 0 kstatmem 264 110 0 86 3 1 2 3 0 8 0 scsiplug 72 4 0 4 2 2 0 1 0 8 0 scxspl 216 14249 0 14249 9 8 1 8 1 8 1 plimitpl 152 159 0 142 1 0 1 1 0 8 0 sigapl 424 1353 0 1282 9 0 9 9 0 8 0 futexpl 64 16773 0 16768 1 0 1 1 0 8 0 knotepl 120 571 0 0 17 0 17 17 0 8 0 kqueuepl 216 373 0 364 2 1 1 2 0 8 0 pipepl 328 292 0 264 11 8 3 8 0 8 0 fdescpl 504 1313 0 1281 6 1 5 6 0 8 1 filepl 152 8457 0 8242 20 8 12 15 0 8 2 lockfpl 104 233 0 231 1 0 1 1 0 8 0 lockfspl 48 101 0 99 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 39 0 22 1 0 1 1 0 8 0 ucredpl 104 1437 0 1424 1 0 1 1 0 8 0 zombiepl 144 1303 0 1303 1 0 1 1 0 8 1 processpl 1176 1353 0 1282 6 0 6 6 0 8 0 procpl 656 2827 0 2748 8 1 7 8 0 8 0 srpgc 96 6 0 6 2 2 0 1 0 8 0 sosppl 168 6 0 6 1 1 0 1 0 8 0 sockpl 688 2152 0 2123 26 22 4 16 0 8 1 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 30 0 0 4 0 4 4 0 8 0 mtagpl 96 117 0 0 3 0 3 3 0 8 0 mbufpl 256 342 0 0 21 0 21 21 0 8 0 bufpl 280 3818 0 136 263 0 263 263 0 8 0 anonpl 24 199291 0 195966 75 29 46 46 0 184 15 amapchunkpl 152 36139 0 35657 31 9 22 27 0 158 3 amappl16 200 4312 0 4275 45 34 11 15 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 127 0 115 1 0 1 1 0 8 0 amappl13 176 12 0 12 2 1 1 1 0 8 1 amappl12 168 1958 0 1926 4 2 2 3 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 248 0 248 1 1 0 1 0 8 0 amappl8 136 26 0 24 1 0 1 1 0 8 0 amappl7 128 110 0 97 1 0 1 1 0 8 0 amappl6 120 179 0 176 1 0 1 1 0 8 0 amappl5 112 125 0 115 1 0 1 1 0 8 0 amappl4 104 324 0 304 1 0 1 1 0 8 0 amappl3 96 7278 0 7166 5 1 4 4 0 8 1 amappl2 88 650 0 588 2 0 2 2 0 8 0 amappl1 80 10913 0 10347 15 1 14 15 0 8 0 amappl 88 10682 0 10516 5 0 5 5 0 92 0 dma65536 65536 1 0 1 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 3 3 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 14 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1313 0 1281 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1313 0 1281 1 0 1 1 0 8 0 vmmpekpl 168 12098 0 12062 3 0 3 3 0 8 0 vmmpepl 168 84894 0 82997 110 15 95 95 0 357 8 vmsppl 456 1312 0 1281 5 1 4 5 0 8 0 rwobjpl 64 28256 0 23397 83 0 83 83 0 8 2 pdppl 4096 2633 0 2562 107 36 71 87 0 8 0 pvpl 32 14658 0 0 119 1 118 118 0 265 0 pmappl 248 1312 0 1281 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 305 0 58 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(ffff8000334aeb10,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+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7f6003414930, 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(fffffd806b54f500,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806b54f4e8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806b54f4e8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8062ea97e0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8062ea97e0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff8000344b9fb8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff8000344b9fb8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fd5590,fffffd806b6ac900,ffff80003c4f6a70) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800010fd5590,fffffd8061040e00,fffffd806b6ac900,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800010fd5590,fffffd806b6ac900,ffff8000344ba238,0,0,0) at sosend+0x804 sendit(ffff80003c4f6a70,4,ffff8000344ba3b0,0,ffff8000344ba470) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80003c4f6a70,ffff8000344ba520,ffff8000344ba470) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff8000344ba520) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000344ba520) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e4433c0960, count: -15