witness: lock order reversal: 1st 0xffff800010fdc748 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd8073aa6858 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(fffffd8073aa6858,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd8073aa6840,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd8073aa6840,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8068b6fbf0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8068b6fbf0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff8000365786d8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff8000365786d8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fdc588,fffffd806cc4f000,ffff80002a50d988) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800010fdc588,fffffd806cc4fd00,fffffd806cc4f000,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800010fdc588,fffffd806cc4f000,ffff800036578958,0,0,0) at sosend+0x804 sendit(ffff80002a50d988,3,ffff800036578ad0,0,ffff800036578b90) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80002a50d988,ffff800036578c40,ffff800036578b90) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff800036578c40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800036578c40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc7d5816bd10, count: -15 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800036578350 rbx 0xfffffd800433f2c8 rdx 0 rcx 0xffff80002a50d988 rax 0xffff800029b5bff0 r8 0xffff800036578230 r9 0x8080808080808080 r10 0xdabf0f9b5a8b55f5 r11 0x70017e11bda13c64 r12 0 r13 0xfffffd8003b56f00 r14 0x3 r15 0xffffffff rip 0xffffffff82a6fbd5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800036578340 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=410680 pid=80119 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a50dc10,0xffff80003c5a47d0 process=0xffff80002a5046d8 user=0xffff800036573000, vmspace=0xfffffd806e131ac0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 3006 328862 34113 0 2 0 syz-executor 67604 253891 29484 0 7 0 syz-executor 60635 426737 30381 0 2 0 syz-executor 80119 160744 45098 60928 2 0x10 syz-executor 80119 30098 45098 60928 2 0x4000010 syz-executor *80119 410680 45098 60928 7 0x4000010 syz-executor 80119 159477 45098 60928 3 0x4000090 fsleep syz-executor 72426 107643 78819 0 2 0 syz-executor 72426 249365 78819 0 3 0x4000080 kqpoll syz-executor 72426 194110 78819 0 3 0x4000080 fsleep syz-executor 76149 383162 93533 0 3 0x80 nanoslp syz-executor 76149 330975 93533 0 3 0x4000080 kqread syz-executor 76149 11964 93533 0 3 0x4000080 fsleep syz-executor 17003 293055 80087 0 3 0x80 nanoslp syz-executor 17003 330173 80087 0 3 0x4000080 fsleep syz-executor 17003 355016 80087 0 3 0x4000080 fifor syz-executor 17003 29597 80087 0 3 0x4000080 fifor syz-executor 93533 95657 98315 0 3 0x82 nanoslp syz-executor 34113 29991 98315 0 3 0x82 nanoslp syz-executor 78819 516550 98315 0 3 0x82 nanoslp syz-executor 56207 285578 98315 0 3 0x82 nanoslp syz-executor 80087 252634 98315 0 3 0x82 nanoslp syz-executor 29484 201839 98315 0 3 0x82 nanoslp syz-executor 45536 107318 0 0 3 0x14280 nfsidl nfsio 19820 234454 0 0 3 0x14280 nfsidl nfsio 39467 329014 0 0 3 0x14280 nfsidl nfsio 25379 270165 0 0 3 0x14280 nfsidl nfsio 1067 167227 0 0 3 0x14280 nfsidl nfsio 3775 202440 0 0 3 0x14280 nfsidl nfsio 87757 399531 0 0 3 0x14280 nfsidl nfsio 20625 403865 0 0 3 0x14280 nfsidl nfsio 94704 523918 0 0 3 0x14280 nfsidl nfsio 34563 232740 0 0 3 0x14280 nfsidl nfsio 64329 506757 0 0 3 0x14280 nfsidl nfsio 5063 455958 0 0 3 0x14280 nfsidl nfsio 78214 280128 0 0 3 0x14280 nfsidl nfsio 65058 110965 0 0 3 0x14280 nfsidl nfsio 93904 140169 0 0 3 0x14280 nfsidl nfsio 16324 16956 0 0 3 0x14280 nfsidl nfsio 83702 208476 0 0 3 0x14280 nfsidl nfsio 62227 304706 0 0 3 0x14280 nfsidl nfsio 8664 182101 0 0 3 0x14280 nfsidl nfsio 49473 477023 0 0 3 0x14280 nfsidl nfsio 98124 490979 1 0 3 0x100083 ttyin getty 92130 252524 0 0 3 0x14200 bored sosplice 30381 2536 98315 0 3 0x82 nanoslp syz-executor 45098 270937 98315 0 3 0x82 nanoslp syz-executor 98315 163780 23563 0 3 0x82 kqread syz-executor 23563 331028 13517 0 3 0x10008a sigsusp ksh 13517 3859 35928 0 3 0x98 kqread sshd-session 35928 321507 45334 0 3 0x92 kqread sshd-session 45334 502448 1 0 3 0x88 kqread sshd 50528 113385 84260 74 3 0x1100092 bpf pflogd 84260 435191 1 0 3 0x80 sbwait pflogd 70844 452759 255 73 3 0x1100090 kqread syslogd 255 124093 1 0 3 0x100082 sbwait syslogd 45147 101373 1 0 3 0x100080 kqread resolvd 75694 2589 54855 77 3 0x100092 kqread dhcpleased 89892 170773 54855 77 3 0x100092 kqread dhcpleased 54855 294999 1 0 3 0x80 kqread dhcpleased 95081 259153 0 0 3 0x14200 bored smr 85110 515590 0 0 2 0x14200 zerothread 3160 473917 0 0 3 0x14200 aiodoned aiodoned 33922 332713 0 0 3 0x14200 syncer update 89393 279266 0 0 3 0x14200 cleaner cleaner 27466 388532 0 0 3 0x14200 reaper reaper 67696 171314 0 0 3 0x14200 pgdaemon pagedaemon 36490 32711 0 0 3 0x14200 bored viomb 29015 32166 0 0 3 0x40014200 acpi0 acpi0 12145 401839 0 0 3 0x40014200 idle1 33645 381026 0 0 3 0x14200 bored softnet3 59753 283509 0 0 3 0x14200 bored softnet2 58993 500361 0 0 3 0x14200 bored softnet1 2007 71479 0 0 2 0x14200 softnet0 883 136140 0 0 3 0x14200 bored systqmp 55405 272583 0 0 3 0x14200 bored systq 51105 243527 0 0 3 0x14200 tmoslp softclockmp 85325 520954 0 0 3 0x40014200 tmoslp softclock 14832 63766 0 0 3 0x40014200 idle0 1 429189 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 80119 (syz-executor) thread 0xffff80002a50d988 (410680) 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 (0xffff800010fdc748) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10211 11118K 11502K 166960K 14533 0 pcb 19 14K 16K 166960K 566 0 rtable 140 5K 8K 166960K 804 0 pf 37 18K 19K 166960K 161 0 ifaddr 32 5K 8K 166960K 121 0 ifgroup 60 2K 2K 166960K 177 0 sysctl 4 1K 2K 166960K 7 0 counters 66 36K 36K 166960K 136 0 ioctlops 0 0K 4K 166960K 1732 0 iov 0 0K 16K 166960K 204 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1454 91K 92K 166960K 3311 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 57 0 VM map 2 1K 1K 166960K 2 0 sem 23 32K 42K 166960K 35 0 dirhash 12 2K 2K 166960K 72 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 89K 166960K 2386 0 sigio 0 0K 0K 166960K 21 0 proc 72 91K 140K 166960K 1024 0 subproc 72 4K 4K 166960K 156 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 236 0 in_multi 56 4K 7K 166960K 292 0 ether_multi 1 0K 0K 166960K 22 0 mrt 1 0K 0K 166960K 13 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 1045 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 229 73K 87K 166960K 23888 0 UVM aobj 101 7K 7K 166960K 116 0 pinsyscall 43 86K 103K 166960K 3782 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 146 0 NDP 13 0K 1K 166960K 90 0 temp 81 6900K 7156K 166960K 88884 0 kqueue 15 24K 30K 166960K 403 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 120 223 0 220 2 1 1 2 0 8 0 rtentry 112 243 0 185 4 0 4 4 0 8 1 unpcb 144 1935 0 1911 9 3 6 6 0 8 5 syncache 336 20 0 20 4 3 1 1 0 8 1 tcpqe 32 4 0 4 3 3 0 1 0 8 0 tcpcb 808 923 0 914 24 22 2 14 0 8 0 arp 120 42 0 32 1 0 1 1 0 8 0 inpcb 376 2835 0 2820 27 19 8 15 0 8 6 nd6 136 56 0 44 1 0 1 1 0 8 0 pkpcb 40 16 0 15 3 2 1 1 0 8 0 kcovpl 48 17 0 9 1 0 1 1 0 8 0 ppxss 1168 16 0 16 3 2 1 1 0 8 1 pffrag 232 14 0 5 1 0 1 1 0 482 0 pffrnode 88 13 0 5 1 0 1 1 0 8 0 pffrent 40 28 0 19 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 24 149 0 43 1 0 1 1 0 8 0 pfstkey 128 149 0 43 4 0 4 4 0 8 0 pfstate 376 149 0 43 11 0 11 11 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 983 0 735 31 12 19 30 0 8 0 art_table 32 986 0 735 4 0 4 4 0 8 0 art_node 16 239 0 187 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 24 0 3 1 0 1 1 0 8 0 shmpl 112 113 0 15 3 0 3 3 0 8 0 dirhash 1024 57 0 40 3 0 3 3 0 8 0 dino2pl 256 5567 0 4052 96 0 96 96 0 8 0 ffsino 280 5567 0 4052 109 0 109 109 0 8 0 nchpl 144 8791 0 8234 64 39 25 64 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 31921 0 31920 4 3 1 2 0 8 0 percpumem 16 82 0 35 1 0 1 1 0 8 0 kstatmem 264 96 0 70 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 16 0 16 4 3 1 1 0 8 1 scxspl 216 26071 0 26071 13 9 4 8 1 8 4 plimitpl 152 601 0 584 1 0 1 1 0 8 0 sigapl 424 2710 0 2639 10 1 9 9 0 8 0 futexpl 64 32155 0 32151 1 0 1 1 0 8 0 knotepl 120 784 0 0 24 0 24 24 0 8 0 kqueuepl 216 708 0 696 7 6 1 5 0 8 0 pipepl 328 370 0 342 8 0 8 8 0 8 5 fdescpl 504 2665 0 2633 5 0 5 5 0 8 0 filepl 152 17927 0 17698 23 6 17 17 0 8 6 lockfpl 104 1190 0 1187 5 1 4 4 0 8 3 lockfspl 48 375 0 372 1 0 1 1 0 8 0 sessionpl 144 48 0 39 1 0 1 1 0 8 0 pgrppl 48 84 0 67 1 0 1 1 0 8 0 ucredpl 104 3432 0 3417 1 0 1 1 0 8 0 zombiepl 144 3139 0 3138 1 0 1 1 0 8 0 processpl 1168 2710 0 2639 7 1 6 6 0 8 0 procpl 648 6391 0 6310 8 0 8 8 0 8 0 srpgc 96 23 0 23 3 3 0 1 0 8 0 sosppl 168 14 0 14 3 2 1 1 0 8 1 sockpl 688 5038 0 4995 41 28 13 16 0 8 8 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 34 0 0 5 0 5 5 0 8 0 mtagpl 96 105 0 0 3 0 3 3 0 8 0 mbufpl 256 305 0 0 19 0 19 19 0 8 1 bufpl 280 8055 0 1889 441 0 441 441 0 8 0 anonpl 24 335573 0 331643 98 37 61 72 0 185 23 amapchunkpl 152 77074 0 76561 39 12 27 30 0 158 3 amappl16 200 6515 0 6477 54 42 12 27 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 160 0 148 1 0 1 1 0 8 0 amappl13 176 5 0 4 1 0 1 1 0 8 0 amappl12 168 3463 0 3433 3 1 2 2 0 8 0 amappl11 160 56 0 41 1 0 1 1 0 8 0 amappl10 152 6 0 6 2 2 0 1 0 8 0 amappl9 144 248 0 248 1 1 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 170 0 157 1 0 1 1 0 8 0 amappl6 120 295 0 291 1 0 1 1 0 8 0 amappl5 112 163 0 153 1 0 1 1 0 8 0 amappl4 104 422 0 404 1 0 1 1 0 8 0 amappl3 96 16182 0 16070 4 0 4 4 0 8 0 amappl2 88 938 0 874 2 0 2 2 0 8 0 amappl1 80 19121 0 18550 14 0 14 14 0 8 0 amappl 88 23212 0 23039 5 0 5 5 0 92 0 dma32768 32768 2 0 2 2 1 1 1 0 8 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 8 0 8 3 3 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 25 0 24 1 0 1 1 0 8 0 aobjpl 72 115 0 15 2 0 2 2 0 8 0 uaddrrnd 24 2665 0 2633 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2665 0 2633 1 0 1 1 0 8 0 vmmpekpl 168 22969 0 22914 3 0 3 3 0 8 0 vmmpepl 168 168488 0 166561 123 28 95 106 0 357 3 vmsppl 456 2664 0 2633 5 0 5 5 0 8 0 rwobjpl 64 50942 0 43967 117 0 117 117 0 8 1 pdppl 4096 5337 0 5266 127 54 73 83 0 8 2 pvpl 32 19083 0 0 154 0 154 154 0 265 0 pmappl 248 2664 0 2633 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 357 0 103 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(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(ffff800031976770,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 __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 syscall(ffff800031976a90) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800031976a90) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75546defdb80, count: -12 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(fffffd8073aa6858,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd8073aa6840,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd8073aa6840,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8068b6fbf0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8068b6fbf0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff8000365786d8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff8000365786d8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fdc588,fffffd806cc4f000,ffff80002a50d988) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800010fdc588,fffffd806cc4fd00,fffffd806cc4f000,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800010fdc588,fffffd806cc4f000,ffff800036578958,0,0,0) at sosend+0x804 sendit(ffff80002a50d988,3,ffff800036578ad0,0,ffff800036578b90) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80002a50d988,ffff800036578c40,ffff800036578b90) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff800036578c40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800036578c40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc7d5816bd10, count: -15