witness: lock order reversal: 1st 0xffff8000014434a0 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd8069e41730 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83404ad9 -> 0xffffffff833a68ec 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(fffffd8069e41730,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd8069e41718,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd8069e41718,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806b556d80,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806b556d80,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c5b2488) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80003c5b2488) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000014432e0,fffffd8078127d00,ffff80003c507c68) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000014432e0,fffffd806b547900,fffffd8078127d00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000014432e0,fffffd8078127d00,ffff80003c5b2708,0,0,0) at sosend+0x804 sendit(ffff80003c507c68,4,ffff80003c5b2880,0,ffff80003c5b2940) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80003c507c68,ffff80003c5b29f0,ffff80003c5b2940) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff80003c5b29f0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5b29f0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x99d0f083b0, count: -15 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c5b2100 rbx 0xfffffd8004708140 rdx 0xffff800001441700 rcx 0xffff80003c507c68 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c5b1fe0 r9 0x8080808080808080 r10 0x2abfe5ac76384a3 r11 0xb41c08fd4a816b70 r12 0 r13 0xfffffd8003f20f00 r14 0x3 r15 0xffffffff rip 0xffffffff8136a795 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c5b20f0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=378814 pid=51915 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=0xffff80003c506558,0xffff80002a364550 process=0xffff8000ffff8948 user=0xffff80003c5ad000, vmspace=0xfffffd806bea2ac8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43104 2741 54035 0 2 0 syz-executor 43104 11446 54035 0 3 0x4000080 fsleep syz-executor 43104 41225 54035 0 3 0x4000080 fsleep syz-executor 43104 162009 54035 0 2 0x4000000 syz-executor 51915 515213 3890 0 7 0 syz-executor *51915 378814 3890 0 7 0x4000000 syz-executor 54576 488920 67132 0 2 0 syz-executor 54576 231578 67132 0 3 0x4000080 fsleep syz-executor 66616 80597 38290 0 3 0x80 nanoslp syz-executor 66616 475312 38290 0 3 0x4000080 kqread syz-executor 66616 71998 38290 0 3 0x4000080 fsleep syz-executor 25873 336384 2675 0 2 0 syz-executor 25873 59950 2675 0 3 0x4000080 fsleep syz-executor 25873 434093 2675 0 3 0x4000080 fsleep syz-executor 24919 156483 83034 0 3 0x90 nanoslp syz-executor 24919 476313 83034 0 3 0x4000090 ttyin syz-executor 24919 290559 83034 0 3 0x4000090 fsleep syz-executor 35670 234455 70487 60928 2 0x10 syz-executor 35670 460822 70487 60928 3 0x4000090 fsleep syz-executor 87322 349032 80288 0 2 0 syz-executor 87322 7641 80288 0 3 0x4000080 fsleep syz-executor 22929 316211 0 0 3 0x14200 acct acct 80288 519388 87920 0 3 0x82 nanoslp syz-executor 2675 286994 87920 0 3 0x82 nanoslp syz-executor 54035 419567 87920 0 3 0x82 nanoslp syz-executor 83034 249612 87920 0 3 0x82 nanoslp syz-executor 38290 167321 87920 0 3 0x82 nanoslp syz-executor 99750 111834 1 0 3 0x100083 ttyin getty 61304 189972 0 0 3 0x14200 bored sosplice 10249 377967 0 0 3 0x14280 nfsidl nfsio 61650 363508 0 0 3 0x14280 nfsidl nfsio 97233 66215 0 0 3 0x14280 nfsidl nfsio 77744 377201 0 0 3 0x14280 nfsidl nfsio 3695 10074 0 0 3 0x14280 nfsidl nfsio 50943 331152 0 0 3 0x14280 nfsidl nfsio 50621 287575 0 0 3 0x14280 nfsidl nfsio 2172 409045 0 0 3 0x14280 nfsidl nfsio 48767 242241 0 0 3 0x14280 nfsidl nfsio 52427 260929 0 0 3 0x14280 nfsidl nfsio 39861 419904 0 0 3 0x14280 nfsidl nfsio 51140 101308 0 0 3 0x14280 nfsidl nfsio 61912 280619 0 0 3 0x14280 nfsidl nfsio 94066 81643 0 0 3 0x14280 nfsidl nfsio 47517 470567 0 0 3 0x14280 nfsidl nfsio 41590 90117 0 0 3 0x14280 nfsidl nfsio 27060 388142 0 0 3 0x14280 nfsidl nfsio 63577 177754 0 0 3 0x14280 nfsidl nfsio 73405 445432 0 0 3 0x14280 nfsidl nfsio 8309 240473 0 0 3 0x14280 nfsidl nfsio 70487 111112 87920 0 3 0x82 nanoslp syz-executor 67132 321858 87920 0 3 0x82 nanoslp syz-executor 3890 241037 87920 0 3 0x82 nanoslp syz-executor 87920 105370 52275 0 3 0x82 kqread syz-executor 52275 151720 4431 0 3 0x10008a sigsusp ksh 4431 507687 27699 0 3 0x98 kqread sshd-session 27699 222306 86445 0 3 0x92 kqread sshd-session 86445 405551 1 0 3 0x88 kqread sshd 1595 47515 14715 74 3 0x1100092 bpf pflogd 14715 64022 1 0 3 0x80 sbwait pflogd 6364 370732 30893 73 3 0x1100090 kqread syslogd 30893 43804 1 0 3 0x100082 sbwait syslogd 70351 407571 1 0 3 0x100080 kqread resolvd 2938 320113 34869 77 3 0x100092 kqread dhcpleased 24699 261875 34869 77 3 0x100092 kqread dhcpleased 34869 168385 1 0 3 0x80 kqread dhcpleased 81610 106309 0 0 3 0x14200 bored smr 23830 187131 0 0 2 0x14200 zerothread 70789 230917 0 0 3 0x14200 aiodoned aiodoned 34937 517393 0 0 3 0x14200 syncer update 89702 163638 0 0 3 0x14200 cleaner cleaner 67677 430861 0 0 3 0x14200 reaper reaper 95797 293744 0 0 3 0x14200 pgdaemon pagedaemon 27786 318042 0 0 3 0x14200 bored viomb 27987 198603 0 0 3 0x40014200 acpi0 acpi0 78541 159589 0 0 3 0x40014200 idle1 4193 391982 0 0 3 0x14200 bored softnet3 81965 479081 0 0 3 0x14200 bored softnet2 68753 299676 0 0 3 0x14200 bored softnet1 18192 502432 0 0 2 0x14200 softnet0 29941 236427 0 0 3 0x14200 bored systqmp 66264 271414 0 0 3 0x14200 bored systq 44902 247804 0 0 3 0x14200 tmoslp softclockmp 70279 141678 0 0 3 0x40014200 tmoslp softclock 71388 365223 0 0 3 0x40014200 idle0 1 73780 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 51915 (syz-executor) thread 0xffff80003c507c68 (378814) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8398f708) #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 (0xffff8000014434a0) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10244 11113K 11416K 166960K 14222 0 pcb 17 15K 16K 166960K 351 0 rtable 233 12K 12K 166960K 774 0 pf 47 20K 25K 166960K 442 0 ifaddr 45 8K 8K 166960K 152 0 ifgroup 68 2K 3K 166960K 252 0 sysctl 4 1K 1K 166960K 4 0 counters 70 37K 37K 166960K 270 0 ioctlops 0 0K 4K 166960K 1794 0 iov 0 0K 16K 166960K 88 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1459 92K 92K 166960K 2930 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 32 0 VM map 2 1K 1K 166960K 2 0 sem 24 16K 18K 166960K 32 0 dirhash 12 2K 3K 166960K 42 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 110K 166960K 1791 0 sigio 0 0K 0K 166960K 25 0 proc 76 103K 140K 166960K 845 0 subproc 72 4K 4K 166960K 126 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 297 0 in_multi 95 6K 7K 166960K 227 0 ether_multi 1 0K 0K 166960K 9 0 mrt 1 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 743 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 240 73K 87K 166960K 18258 0 UVM aobj 49 4K 4K 166960K 56 0 pinsyscall 43 86K 100K 166960K 3062 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 81 0 NDP 15 0K 2K 166960K 105 0 temp 79 8644K 8756K 166960K 85648 0 kqueue 17 28K 30K 166960K 335 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 120 195 0 192 2 1 1 2 0 8 0 rtentry 112 230 0 133 4 0 4 4 0 8 0 unpcb 144 1574 0 1550 14 10 4 10 0 8 3 syncache 336 14 0 14 4 3 1 1 0 8 1 tcpqe 32 4 0 4 2 2 0 1 0 8 0 tcpcb 808 479 0 472 10 8 2 8 0 8 1 arp 120 40 0 23 1 0 1 1 0 8 0 inpcb 376 1845 0 1835 23 20 3 15 0 8 1 nd6 136 51 0 26 2 1 1 2 0 8 0 pkpcb 40 14 0 13 2 1 1 1 0 8 0 kcovpl 48 14 0 6 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1168 76 0 76 3 2 1 1 0 8 1 pppxif 1472 13 0 13 2 1 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 13 0 4 1 0 1 1 0 482 0 pffrnode 88 13 0 4 1 0 1 1 0 8 0 pffrent 40 26 0 17 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 26 0 25 2 1 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 25 0 23 1 0 1 1 0 8 0 pfstitem 24 97 0 23 1 0 1 1 0 8 0 pfstkey 128 101 0 28 3 0 3 3 0 8 0 pfstate 376 97 0 25 8 0 8 8 0 8 0 pfrule 1344 104 0 97 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 952 0 489 43 13 30 31 0 8 1 art_table 32 954 0 489 4 0 4 4 0 8 0 art_node 16 226 0 144 1 0 1 1 0 8 0 sysvmsgpl 40 56 0 16 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 26 0 4 1 0 1 1 0 8 0 shmpl 112 53 0 7 2 0 2 2 0 8 0 dirhash 1024 37 0 20 3 0 3 3 0 8 0 dino2pl 256 4534 0 3015 95 0 95 95 0 8 0 ffsino 280 4534 0 3015 109 0 109 109 0 8 0 nchpl 144 7005 0 5301 64 0 64 64 0 8 0 rtmask 32 15 0 15 3 2 1 1 0 8 1 uvmvnodes 80 5639 0 0 116 0 116 116 0 8 0 vnodes 216 5639 0 0 314 0 314 314 0 8 0 namei 1024 24931 0 24930 2 1 1 1 0 8 0 percpumem 16 149 0 100 1 0 1 1 0 8 0 kstatmem 264 150 0 120 4 1 3 3 0 8 0 scsiplug 72 9 0 9 3 2 1 1 0 8 1 scxspl 216 23932 0 23932 11 8 3 6 1 8 3 plimitpl 152 604 0 586 1 0 1 1 0 8 0 sigapl 424 2103 0 2031 10 1 9 9 0 8 0 futexpl 64 25604 0 25595 1 0 1 1 0 8 0 knotepl 120 737 0 0 23 0 23 23 0 8 0 kqueuepl 216 769 0 756 11 8 3 5 0 8 2 pipepl 328 278 0 250 3 0 3 3 0 8 0 fdescpl 504 2061 0 2029 5 0 5 5 0 8 0 filepl 152 13716 0 13484 26 14 12 19 0 8 0 lockfpl 104 489 0 486 1 0 1 1 0 8 0 lockfspl 48 208 0 205 1 0 1 1 0 8 0 sessionpl 144 37 0 28 1 0 1 1 0 8 0 pgrppl 48 84 0 67 1 0 1 1 0 8 0 ucredpl 104 2562 0 2546 1 0 1 1 0 8 0 zombiepl 144 2068 0 2068 1 0 1 1 0 8 1 processpl 1176 2103 0 2031 6 0 6 6 0 8 0 procpl 656 4801 0 4716 8 0 8 8 0 8 0 srpgc 96 17 0 17 2 2 0 1 0 8 0 sosppl 168 6 0 6 1 0 1 1 0 8 1 sockpl 688 3716 0 3678 44 34 10 26 0 8 6 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 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 37 0 0 5 0 5 5 0 8 1 mtagpl 96 117 0 0 3 0 3 3 0 8 0 mbufpl 256 357 0 0 23 0 23 23 0 8 0 bufpl 280 8057 0 1902 440 0 440 440 0 8 0 anonpl 24 270983 0 266924 105 44 61 73 0 184 18 amapchunkpl 152 58567 0 58010 35 7 28 32 0 158 3 amappl16 200 5272 0 5238 45 33 12 24 0 8 8 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 144 0 132 1 0 1 1 0 8 0 amappl13 176 4 0 4 2 2 0 1 0 8 0 amappl12 168 2809 0 2776 3 1 2 2 0 8 0 amappl11 160 120 0 106 1 0 1 1 0 8 0 amappl10 152 28 0 27 1 0 1 1 0 8 0 amappl9 144 282 0 281 1 0 1 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 144 0 132 1 0 1 1 0 8 0 amappl6 120 259 0 255 1 0 1 1 0 8 0 amappl5 112 165 0 155 1 0 1 1 0 8 0 amappl4 104 365 0 345 1 0 1 1 0 8 0 amappl3 96 12172 0 12050 4 0 4 4 0 8 0 amappl2 88 810 0 747 2 0 2 2 0 8 0 amappl1 80 14957 0 14385 16 2 14 14 0 8 0 amappl 88 17696 0 17513 5 0 5 5 0 92 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 2 0 1 0 8 0 dma64 64 17 0 17 3 2 1 1 0 8 1 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 55 0 7 1 0 1 1 0 8 0 uaddrrnd 24 2061 0 2029 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2061 0 2029 1 0 1 1 0 8 0 vmmpekpl 168 16718 0 16657 4 0 4 4 0 8 0 vmmpepl 168 131375 0 129440 123 22 101 103 0 357 9 vmsppl 456 2060 0 2029 7 2 5 5 0 8 0 rwobjpl 64 40729 0 34091 110 1 109 109 0 8 0 pdppl 4096 4130 0 4058 112 40 72 82 0 8 0 pvpl 32 19825 0 0 161 1 160 160 0 265 0 pmappl 248 2060 0 2029 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 331 0 71 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(ffffffff837e4ff0) 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(ffffffff8398f500) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8398f500) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a40acd0,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff8398f500) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8398f500) 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: 0x7c5cfa5fac10, 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(fffffd8069e41730,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd8069e41718,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd8069e41718,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806b556d80,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806b556d80,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c5b2488) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80003c5b2488) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000014432e0,fffffd8078127d00,ffff80003c507c68) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000014432e0,fffffd806b547900,fffffd8078127d00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000014432e0,fffffd8078127d00,ffff80003c5b2708,0,0,0) at sosend+0x804 sendit(ffff80003c507c68,4,ffff80003c5b2880,0,ffff80003c5b2940) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80003c507c68,ffff80003c5b29f0,ffff80003c5b2940) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff80003c5b29f0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5b29f0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x99d0f083b0, count: -15