witness: lock order reversal: 1st 0xffff8000015fb9f0 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806eac57a0 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83412b2d -> 0xffffffff83384f88 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: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:775 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 sblock+0xb6 sys/kern/uipc_socket2.c:536 #2 sosplice+0x312 sys/kern/uipc_socket.c:1347 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1227 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #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(fffffd806eac57a0,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806eac5788,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806eac5788,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8066fddcf0,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd8066fddcf0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003bfe68a0) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003bfe68a0) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff8000015fb808,fffffd806d6a5900,ffff8000fffe27f0) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff8000015fb808,fffffd805ebda700,fffffd806d6a5900,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff8000015fb808,fffffd806d6a5900,ffff80003bfe6b28,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff8000fffe27f0,6,ffff80003bfe6ca8,e,ffff80003bfe6d60) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff8000fffe27f0,ffff80003bfe6e10,ffff80003bfe6d60) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003bfe6e10) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bfe6e10) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf7de6dce440, count: -15 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003bfe6510 rbx 0 rdx 0 rcx 0xffff8000fffe27f0 rax 0xffff8000299ddff0 r8 0xffff80003bfe63f0 r9 0x8080808080808080 r10 0x2be3d0f243f2279b r11 0x552c276a3c506a74 r12 0xfffffd8003f5c8c0 r13 0xfffffd8004743f10 r14 0x3 r15 0xffffffff8341c190 substchar+0x3540 rip 0xffffffff831ea265 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003bfe6500 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=166043 pid=11500 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=0xffff8000fffe3780,0xffff8000fffe3a28 process=0xffff8000fffe79e0 user=0xffff80003bfe1000, vmspace=0xfffffd806c99a7b8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 96959 338947 51234 60928 7 0x10 syz-executor 96959 261353 51234 60928 3 0x4000090 fsleep syz-executor 11500 459939 23018 0 2 0 syz-executor *11500 166043 23018 0 7 0x4000000 syz-executor 11500 28011 23018 0 3 0x4000080 fsleep syz-executor 71565 56439 68239 0 3 0x80 nanoslp syz-executor 71565 411971 68239 0 3 0x4000080 wsevent_read syz-executor 71565 325221 68239 0 3 0x4000080 fsleep syz-executor 44378 392523 77737 0 3 0x100082 sbwait arp 77737 434064 96331 0 3 0x10008a sigsusp sh 78375 380263 51308 0 3 0x100082 sbwait arp 51308 307297 44832 0 3 0x10008a sigsusp sh 51234 327799 22086 0 3 0x82 nanoslp syz-executor 96331 482526 22086 0 3 0x82 wait syz-executor 68239 447194 22086 0 3 0x82 nanoslp syz-executor 34672 522758 22086 0 3 0x82 nanoslp syz-executor 44832 295187 22086 0 3 0x82 wait syz-executor 40965 414161 22086 0 3 0x82 wait syz-executor 23018 489203 22086 0 3 0x82 nanoslp syz-executor 34152 402444 22086 0 3 0x82 wait syz-executor 22086 92726 13999 0 3 0x82 kqread syz-executor 13999 168656 4819 0 3 0x10008a sigsusp ksh 4819 338080 38154 0 3 0x98 kqread sshd-session 38154 206850 31110 0 3 0x92 kqread sshd-session 28625 432219 1 0 3 0x100083 ttyopn getty 31110 458012 1 0 3 0x88 kqread sshd 12174 494824 67127 74 3 0x1100092 bpf pflogd 67127 272799 1 0 3 0x80 sbwait pflogd 83713 427207 41722 73 3 0x1100090 kqread syslogd 41722 482533 1 0 3 0x100082 sbwait syslogd 36178 493719 1 0 3 0x100080 kqread resolvd 87065 130979 35785 77 3 0x100092 kqread dhcpleased 1702 223355 35785 77 3 0x100092 kqread dhcpleased 35785 340962 1 0 3 0x80 kqread dhcpleased 52533 260733 0 0 3 0x14200 bored smr 24785 77996 0 0 3 0x14200 pgzero zerothread 94020 390368 0 0 3 0x14200 aiodoned aiodoned 60808 465493 0 0 3 0x14200 syncer update 3403 418472 0 0 3 0x14200 cleaner cleaner 89518 166549 0 0 3 0x14200 reaper reaper 35628 314134 0 0 3 0x14200 pgdaemon pagedaemon 24403 386175 0 0 3 0x14200 bored viomb 55487 307885 0 0 3 0x40014200 acpi0 acpi0 54781 440974 0 0 3 0x40014200 idle1 8012 200367 0 0 3 0x14200 bored softnet1 64262 420302 0 0 2 0x14200 softnet0 71649 251022 0 0 3 0x14200 bored systqmp 52819 291170 0 0 3 0x14200 bored systq 45918 475838 0 0 3 0x14200 tmoslp softclockmp 20412 16107 0 0 3 0x40014200 tmoslp softclock 40106 153443 0 0 3 0x40014200 idle0 1 467116 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 96959 (syz-executor) thread 0xffff8000fffe3780 (338947) exclusive rwlock uobjlk r = 0 (0xfffffd806c9ae9c8) #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 uvm_fault+0x1e5 sys/uvm/uvm_fault.c:649 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806c99ae70) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #7 recall_trap+0x8 Process 11500 (syz-executor) thread 0xffff8000fffe27f0 (166043) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839333c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 unp_connect+0x28c sys/kern/uipc_usrreq.c:872 #2 uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 #3 sosend+0x804 sys/kern/uipc_socket.c:-1 #4 sendit+0x5a5 sys/kern/uipc_syscalls.c:785 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff8000015fb9f0) #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 sblock+0xb6 sys/kern/uipc_socket2.c:536 #3 sosend+0x2e9 sys/kern/uipc_socket.c:639 #4 sendit+0x5a5 sys/kern/uipc_syscalls.c:785 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11074 12104K 12248K 166960K 12426 0 pcb 17 16K 18K 166960K 244 0 rtable 154 6K 8K 166960K 390 0 pf 37 18K 18K 166960K 69 0 ifaddr 33 5K 7K 166960K 59 0 ifgroup 55 2K 2K 166960K 89 0 sysctl 4 1K 9K 166960K 9 0 counters 70 37K 37K 166960K 96 0 ioctlops 0 0K 4K 166960K 1587 0 iov 0 0K 12K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1397 88K 88K 166960K 1684 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 21 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 20 73K 89K 166960K 467 0 sigio 0 0K 0K 166960K 9 0 proc 75 131K 147K 166960K 560 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 44 0 in_multi 49 3K 6K 166960K 112 0 ether_multi 1 0K 0K 166960K 11 0 mrt 0 0K 0K 166960K 8 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 539 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 268 156K 169K 166960K 6224 0 UVM aobj 7 2K 2K 166960K 7 0 pinsyscall 47 94K 106K 166960K 1578 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 19 0 NDP 12 0K 1K 166960K 36 0 temp 47 8680K 8746K 166960K 18074 0 kqueue 13 20K 32K 166960K 94 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 61 0 56 1 0 1 1 0 8 0 rtentry 176 114 0 56 5 0 5 5 0 8 0 unpcb 144 342 0 324 6 3 3 6 0 8 2 syncache 336 5 0 5 3 2 1 1 0 8 1 tcpcb 736 268 0 232 4 0 4 4 0 8 0 arp 136 20 0 8 1 0 1 1 0 8 0 inpcb 328 821 0 780 10 3 7 9 0 8 3 nd6 152 20 0 10 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 8 0 8 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 1 0 1 0 8 0 pfstscr 40 3 0 2 1 0 1 1 0 8 0 pffrag 232 6 0 0 1 0 1 1 0 482 0 pffrnode 88 5 0 0 1 0 1 1 0 8 0 pffrent 40 6 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 pfsrclim 320 3 0 3 1 0 1 1 0 8 1 pfstlim 224 1 0 0 1 0 1 1 0 8 0 pfstitem 24 4 0 0 1 0 1 1 0 8 0 pfstkey 128 7 0 4 1 0 1 1 0 8 0 pfstate 448 4 0 2 1 0 1 1 0 8 0 pfrule 1360 1 0 1 1 0 1 1 0 8 1 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 466 0 213 26 2 24 26 0 8 5 art_table 40 468 0 213 5 1 4 5 0 8 0 art_node 32 113 0 60 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 6 1 0 1 1 0 8 0 semapl 112 17 0 7 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2254 0 748 95 0 95 95 0 8 0 ffsino 296 2254 0 748 117 0 117 117 0 8 0 nchpl 144 2945 0 1239 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 vnodes 216 2509 0 0 140 0 140 140 0 8 0 namei 1024 9744 0 9743 2 1 1 1 0 8 0 percpumem 16 63 0 13 1 0 1 1 0 8 0 kstatmem 264 52 0 22 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 17151 0 17151 10 8 2 8 1 8 2 plimitpl 152 78 0 61 1 0 1 1 0 8 0 sigapl 424 776 0 726 7 0 7 7 0 8 0 knotepl 120 564 0 0 18 0 18 18 0 8 0 kqueuepl 224 128 0 119 1 0 1 1 0 8 0 pipepl 344 220 0 191 9 0 9 9 0 8 6 fdescpl 528 760 0 726 3 0 3 3 0 8 0 filepl 160 4651 0 4388 18 0 18 18 0 8 5 lockfpl 104 120 0 117 1 0 1 1 0 8 0 lockfspl 48 52 0 49 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 491 0 474 1 0 1 1 0 8 0 zombiepl 144 729 0 726 2 1 1 1 0 8 0 processpl 1232 776 0 726 5 0 5 5 0 8 0 procpl 664 1433 0 1378 6 0 6 6 0 8 0 sosppl 176 3 0 3 1 0 1 1 0 8 1 sockpl 752 1239 0 1175 22 11 11 21 0 8 3 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1464 0 0 91 0 91 91 0 8 0 bufpl 280 6952 0 816 439 0 439 439 0 8 0 anonpl 32 11021 0 0 89 0 89 89 0 246 0 amapchunkpl 152 20244 0 19703 28 1 27 28 0 158 5 amappl16 200 3558 0 3529 27 14 13 22 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 24 0 24 1 1 0 1 0 8 0 amappl13 176 419 0 416 1 0 1 1 0 8 0 amappl12 168 1121 0 1074 3 0 3 3 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 50 0 36 1 0 1 1 0 8 0 amappl9 144 257 0 257 1 1 0 1 0 8 0 amappl8 136 33 0 31 1 0 1 1 0 8 0 amappl7 128 84 0 83 1 0 1 1 0 8 0 amappl6 120 273 0 255 1 0 1 1 0 8 0 amappl5 112 97 0 86 1 0 1 1 0 8 0 amappl4 104 417 0 382 1 0 1 1 0 8 0 amappl3 96 3341 0 3235 4 1 3 3 0 8 0 amappl2 88 874 0 796 2 0 2 2 0 8 0 amappl1 80 10627 0 9989 15 0 15 15 0 8 0 amappl 88 5447 0 5265 5 0 5 5 0 92 0 uvmvnodes 80 124 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 128 256 0 256 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 760 0 726 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 760 0 726 1 0 1 1 0 8 0 vmmpekpl 168 8231 0 8192 2 0 2 2 0 8 0 vmmpepl 168 56428 0 54391 108 3 105 105 0 357 9 vmsppl 488 759 0 726 5 0 5 5 0 8 0 rwobjpl 80 18973 0 17819 31 0 31 31 0 8 3 pdppl 4096 1527 0 1452 102 25 77 85 0 8 2 pvpl 32 18307 0 0 148 0 148 148 0 265 0 pmappl 256 759 0 726 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 356 0 32 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83864ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff83932bc0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83932bc0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80003bfe0360,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83932bc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83932bc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83932bc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83932bc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(fffffd806c99ad70,e379e7eb000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80003bfe0890,e379e7eb000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003bfe0890) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x738c88a099d0, count: -16 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(fffffd806eac57a0,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806eac5788,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806eac5788,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8066fddcf0,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd8066fddcf0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003bfe68a0) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003bfe68a0) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff8000015fb808,fffffd806d6a5900,ffff8000fffe27f0) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff8000015fb808,fffffd805ebda700,fffffd806d6a5900,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff8000015fb808,fffffd806d6a5900,ffff80003bfe6b28,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff8000fffe27f0,6,ffff80003bfe6ca8,e,ffff80003bfe6d60) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff8000fffe27f0,ffff80003bfe6e10,ffff80003bfe6d60) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003bfe6e10) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bfe6e10) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf7de6dce440, count: -15