witness: lock order reversal: 1st 0xffff8000012d9a08 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806e7a5758 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83120c01 -> 0xffffffff830cf67f 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] 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:537 #2 sosplice+0x40d sys/kern/uipc_socket.c:1358 #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:437 witness_checkorder(fffffd806e7a5758,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e7a5740,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e7a5740,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805f2c31c0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805f2c31c0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c597f08) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80003c597f08) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000012d9848,fffffd80625fbf00,ffff80002a478548) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000012d9848,fffffd806ba88900,fffffd80625fbf00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000012d9848,fffffd80625fbf00,ffff80003c598188,0,0,0) at sosend+0x804 sendit(ffff80002a478548,3,ffff80003c598300,0,ffff80003c5983c0) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80002a478548,ffff80003c598470,ffff80003c5983c0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff80003c598470) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c598470) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x53d4f6d8770, count: -15 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c597b80 rbx 0xfffffd800433e360 rdx 0xffff80000128e700 rcx 0xffff80002a478548 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c597a60 r9 0x8080808080808080 r10 0x9d36ceb1c8cf9140 r11 0x63af61c945012d56 r12 0 r13 0xfffffd8003b56f00 r14 0x3 r15 0xffffffff rip 0xffffffff82a6fbd5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c597b70 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=302919 pid=16205 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a44f460,0xffffffff8360c558 process=0xffff80003c673498 user=0xffff80003c593000, vmspace=0xfffffd806bfa4ac8 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16205 53895 12839 0 7 0 syz-executor *16205 302919 12839 0 7 0x4000000 syz-executor 21743 372453 72993 60928 3 0x90 nanoslp syz-executor 21743 218359 72993 60928 3 0x4000090 sbwait syz-executor 21743 327680 72993 60928 3 0x4000090 fsleep syz-executor 21743 107154 72993 60928 3 0x4000090 fsleep syz-executor 21743 471809 72993 60928 3 0x4000090 fsleep syz-executor 81129 90075 13384 0 3 0x80 nanoslp syz-executor 81129 353687 13384 0 3 0x4000080 netcon syz-executor 81129 75512 13384 0 3 0x4000080 fsleep syz-executor 41977 74691 63268 0 3 0x80 nanoslp syz-executor 41977 387956 63268 0 3 0x4000080 ttyin syz-executor 41977 419355 63268 0 3 0x4000080 fsleep syz-executor 56347 282147 48708 0 2 0 syz-executor 56347 183120 48708 0 3 0x4000080 ttyout syz-executor 56347 325128 48708 0 3 0x4000080 fsleep syz-executor 42842 219730 1 0 3 0x100083 ttyin getty 3295 481702 41474 0 3 0x82 wait syz-executor 92456 474169 0 0 3 0x14280 nfsidl nfsio 40591 186036 0 0 3 0x14280 nfsidl nfsio 38142 330605 0 0 3 0x14280 nfsidl nfsio 39260 86452 0 0 3 0x14280 nfsidl nfsio 55637 296815 0 0 3 0x14280 nfsidl nfsio 57687 270941 0 0 3 0x14280 nfsidl nfsio 76180 269567 0 0 3 0x14280 nfsidl nfsio 8582 325180 0 0 3 0x14280 nfsidl nfsio 50701 505503 0 0 3 0x14280 nfsidl nfsio 16264 309985 0 0 3 0x14280 nfsidl nfsio 36113 297657 0 0 3 0x14280 nfsidl nfsio 30716 179902 0 0 3 0x14280 nfsidl nfsio 14193 375351 0 0 3 0x14280 nfsidl nfsio 84698 238797 0 0 3 0x14280 nfsidl nfsio 69428 462217 0 0 3 0x14280 nfsidl nfsio 28243 520754 0 0 3 0x14280 nfsidl nfsio 56673 330345 0 0 3 0x14280 nfsidl nfsio 6100 216268 0 0 3 0x14280 nfsidl nfsio 20376 520912 0 0 3 0x14280 nfsidl nfsio 39693 215742 0 0 3 0x14280 nfsidl nfsio 28722 415537 0 0 3 0x14200 bored sosplice 62914 198226 88834 0 3 0x82 sbwait sshd-session 72993 38442 41474 0 3 0x82 nanoslp syz-executor 21882 462008 41474 0 3 0x82 wait syz-executor 16811 321411 41474 0 3 0x82 nanoslp syz-executor 48708 268602 41474 0 3 0x82 nanoslp syz-executor 13384 400237 41474 0 3 0x82 nanoslp syz-executor 63268 348297 41474 0 3 0x82 nanoslp syz-executor 12839 221980 41474 0 3 0x82 nanoslp syz-executor 41474 468614 37564 0 3 0x82 kqread syz-executor 37564 275198 68550 0 3 0x10008a sigsusp ksh 68550 243376 89485 0 3 0x98 kqread sshd-session 89485 56737 88834 0 3 0x92 kqread sshd-session 88834 452169 1 0 3 0x88 kqread sshd 80013 136799 48282 74 3 0x1100092 bpf pflogd 48282 296531 1 0 3 0x80 sbwait pflogd 67116 475659 46607 73 3 0x1100090 kqread syslogd 46607 184261 1 0 3 0x100082 sbwait syslogd 35890 384746 1 0 3 0x100080 kqread resolvd 89623 365374 91401 77 3 0x100092 kqread dhcpleased 46664 389210 91401 77 3 0x100092 kqread dhcpleased 91401 337595 1 0 3 0x80 kqread dhcpleased 38243 220704 0 0 3 0x14200 bored smr 47579 488412 0 0 3 0x14200 pgzero zerothread 62606 63462 0 0 3 0x14200 aiodoned aiodoned 38078 210572 0 0 3 0x14200 syncer update 15838 28230 0 0 3 0x14200 cleaner cleaner 22646 278275 0 0 3 0x14200 reaper reaper 59973 207937 0 0 3 0x14200 pgdaemon pagedaemon 67745 131696 0 0 3 0x14200 bored viomb 76301 362400 0 0 3 0x40014200 acpi0 acpi0 78296 164123 0 0 3 0x40014200 idle1 2992 30192 0 0 3 0x14200 bored softnet3 68227 496473 0 0 3 0x14200 bored softnet2 98710 124688 0 0 3 0x14200 bored softnet1 13432 210957 0 0 2 0x14200 softnet0 44877 9861 0 0 3 0x14200 bored systqmp 86769 333040 0 0 3 0x14200 bored systq 31675 66948 0 0 3 0x14200 tmoslp softclockmp 96206 168665 0 0 3 0x40014200 tmoslp softclock 67931 257006 0 0 3 0x40014200 idle0 1 38404 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 16205 (syz-executor) thread 0xffff80002a478548 (302919) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8360db10) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 unp_connect+0x26c sys/kern/uipc_usrreq.c:868 #2 uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 #3 sosend+0x804 #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 exclusive rwlock sbufsnd r = 0 (0xffff8000012d9a08) #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:537 #3 sosend+0x2e2 sys/kern/uipc_socket.c:625 #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 21743 (syz-executor) thread 0xffff80002a44e530 (218359) exclusive rrwlock inode r = 0 (0xfffffd806dea8a98) #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 cache_lookup+0x36e sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x21b sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #10 namei+0x7aa sys/kern/vfs_lookup.c:250 #11 vn_open+0x13f sys/kern/vfs_vnops.c:140 #12 vndioctl+0xcb1 sys/dev/vnd.c:457 #13 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #14 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #15 sys_ioctl+0x5c3 #16 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #16 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #17 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10203 11101K 11489K 166960K 13203 0 pcb 17 15K 17K 166960K 413 0 rtable 245 8K 8K 166960K 530 0 pf 37 18K 21K 166960K 101 0 ifaddr 44 7K 8K 166960K 75 0 ifgroup 58 2K 2K 166960K 110 0 sysctl 4 1K 1K 166960K 4 0 counters 64 36K 36K 166960K 100 0 ioctlops 0 0K 4K 166960K 1666 0 iov 0 0K 16K 166960K 131 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1419 89K 89K 166960K 2416 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 26 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 85 0 dirhash 12 2K 3K 166960K 36 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 97K 166960K 1341 0 sigio 0 0K 0K 166960K 22 0 proc 72 91K 128K 166960K 706 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 331 0 in_multi 92 6K 7K 166960K 144 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 880 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 267 75K 88K 166960K 14156 0 UVM aobj 17 2K 2K 166960K 18 0 pinsyscall 45 90K 106K 166960K 2491 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 80 0 NDP 12 0K 2K 166960K 50 0 temp 78 6900K 6980K 166960K 48540 0 kqueue 13 20K 32K 166960K 238 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 120 213 0 210 4 2 2 2 0 8 1 rtentry 112 165 0 54 4 0 4 4 0 8 0 unpcb 144 1123 0 1098 12 10 2 6 0 8 0 syncache 336 10 0 10 3 3 0 1 0 8 0 tcpqe 32 3 0 3 2 2 0 1 0 8 0 tcpcb 808 620 0 609 23 18 5 8 0 8 3 arp 120 25 0 7 1 0 1 1 0 8 0 inpcb 376 1869 0 1850 35 26 9 12 0 8 6 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 2 0 2 1 1 0 1 0 8 0 nd6 136 49 0 10 2 0 2 2 0 8 0 pkpcb 40 3 0 3 3 3 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 12 0 12 4 3 1 1 0 8 1 pfstscr 40 3 0 3 2 2 0 1 0 8 0 pffrag 232 7 0 0 1 0 1 1 0 482 0 pffrnode 88 7 0 0 1 0 1 1 0 8 0 pffrent 40 9 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 pftag 88 2 0 1 2 1 1 1 0 8 0 pfstitem 24 109 0 35 1 0 1 1 0 8 0 pfstkey 128 114 0 40 3 0 3 3 0 8 0 pfstate 376 112 0 38 8 0 8 8 0 8 0 pfrule 1344 29 0 23 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 797 0 228 39 2 37 38 0 8 1 art_table 32 798 0 228 5 0 5 5 0 8 0 art_node 16 163 0 70 1 0 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 79 0 69 1 0 1 1 0 8 0 shmpl 112 15 0 1 1 0 1 1 0 8 0 dirhash 1024 33 0 16 3 0 3 3 0 8 0 dino2pl 256 3770 0 2268 95 0 95 95 0 8 0 ffsino 280 3770 0 2268 109 0 109 109 0 8 0 nchpl 144 5722 0 4033 63 0 63 63 0 8 0 uvmvnodes 80 4492 0 0 92 0 92 92 0 8 0 vnodes 216 4492 0 0 250 0 250 250 0 8 0 namei 1024 19955 0 19954 3 2 1 1 0 8 0 percpumem 16 64 0 18 1 0 1 1 0 8 0 kstatmem 264 60 0 36 2 0 2 2 0 8 0 scsiplug 72 3 0 3 2 1 1 1 0 8 1 scxspl 216 16387 0 16387 14 12 2 8 1 8 2 plimitpl 152 246 0 226 1 0 1 1 0 8 0 sigapl 424 1669 0 1597 10 1 9 9 0 8 0 futexpl 64 18901 0 18895 1 0 1 1 0 8 0 knotepl 120 572 0 0 18 0 18 18 0 8 0 kqueuepl 216 546 0 535 9 4 5 5 0 8 4 pipepl 328 330 0 301 11 8 3 8 0 8 0 fdescpl 504 1629 0 1596 6 1 5 6 0 8 0 filepl 152 11620 0 11371 39 21 18 18 0 8 7 lockfpl 104 602 0 600 2 1 1 2 0 8 0 lockfspl 48 191 0 189 1 0 1 1 0 8 0 sessionpl 144 33 0 23 1 0 1 1 0 8 0 pgrppl 48 89 0 71 1 0 1 1 0 8 0 ucredpl 104 1624 0 1609 1 0 1 1 0 8 0 zombiepl 144 1729 0 1726 2 1 1 1 0 8 0 processpl 1168 1669 0 1597 7 1 6 6 0 8 0 procpl 648 3707 0 3624 9 1 8 9 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 15 0 15 4 3 1 1 0 8 1 sockpl 688 3238 0 3191 48 37 11 17 0 8 6 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 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 131 0 0 17 0 17 17 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 29 0 0 1 0 1 1 0 8 0 mbufpl 256 537 0 0 34 0 34 34 0 8 0 bufpl 280 5746 0 138 401 0 401 401 0 8 0 anonpl 24 208898 0 201932 73 26 47 59 0 185 0 amapchunkpl 152 45626 0 44902 45 16 29 34 0 158 0 amappl16 200 3662 0 3556 31 22 9 17 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 179 0 166 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 2338 0 2305 3 1 2 2 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 7 0 6 1 0 1 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 113 0 100 1 0 1 1 0 8 0 amappl6 120 192 0 187 1 0 1 1 0 8 0 amappl5 112 163 0 153 1 0 1 1 0 8 0 amappl4 104 351 0 330 1 0 1 1 0 8 0 amappl3 96 9387 0 9257 5 1 4 4 0 8 0 amappl2 88 733 0 663 2 0 2 2 0 8 0 amappl1 80 12999 0 12331 16 0 16 16 0 8 0 amappl 88 13648 0 13442 6 1 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 0 1 1 0 8 1 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 2 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 17 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1630 0 1597 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1630 0 1597 1 0 1 1 0 8 0 vmmpekpl 168 15197 0 15151 3 0 3 3 0 8 0 vmmpepl 168 103747 0 101567 111 14 97 102 0 357 0 vmsppl 456 1629 0 1597 5 0 5 5 0 8 0 rwobjpl 64 32604 0 26938 92 0 92 92 0 8 0 pdppl 4096 3267 0 3194 119 46 73 87 0 8 0 pvpl 32 17549 0 0 142 0 142 142 0 265 0 pmappl 248 1629 0 1597 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 366 0 80 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff834ccff0) 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(ffffffff8360d908) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8360d908) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800036d86530,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff8360d908) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8360d908) 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: 0x77f67ece9800, 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:437 witness_checkorder(fffffd806e7a5758,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e7a5740,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e7a5740,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805f2c31c0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805f2c31c0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c597f08) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80003c597f08) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000012d9848,fffffd80625fbf00,ffff80002a478548) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000012d9848,fffffd806ba88900,fffffd80625fbf00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000012d9848,fffffd80625fbf00,ffff80003c598188,0,0,0) at sosend+0x804 sendit(ffff80002a478548,3,ffff80003c598300,0,ffff80003c5983c0) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80002a478548,ffff80003c598470,ffff80003c5983c0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff80003c598470) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c598470) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x53d4f6d8770, count: -15