witness: lock order reversal: 1st 0xffff800001490ad0 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806e478dc8 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff833d1e1a -> 0xffffffff83343bfc 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:870 #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:684 #7 vndioctl+0xdfe 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+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:746 #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+0x3e1 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:746 #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(fffffd806e478dc8,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e478db0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e478db0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8064621050,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd8064621050,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c4558b0) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003c4558b0) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff8000014908e8,fffffd806b99b100,ffff80003640afc0) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff8000014908e8,fffffd807ed35200,fffffd806b99b100,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff8000014908e8,fffffd806b99b100,ffff80003c455b38,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff80003640afc0,5,ffff80003c455cb8,e,ffff80003c455d70) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff80003640afc0,ffff80003c455e20,ffff80003c455d70) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003c455e20) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c455e20) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1bd01675cf0, count: -15 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c455530 rbx 0 rdx 0xffff800001479580 rcx 0xffff80003640afc0 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c455410 r9 0x8080808080808080 r10 0x6da0493c220813c7 r11 0x3773ddb64c9b6393 r12 0xfffffd8003ef7680 r13 0xfffffd80046de360 r14 0x3 r15 0xffffffff833dadbe substchar+0xb292 rip 0xffffffff81d6b285 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c455520 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=74608 pid=29364 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=0xffff8000fffee018,0xffff8000363fa030 process=0xffff80003c4c8028 user=0xffff80003c450000, vmspace=0xfffffd806461a210 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 76476 437559 19089 0 7 0 syz-executor 86413 29444 48116 0 3 0x80 nanoslp syz-executor 86413 137224 48116 0 3 0x4000080 fsleep syz-executor 86413 378759 48116 0 3 0x4000080 fsleep syz-executor 86413 422964 48116 0 3 0x4000080 fsleep syz-executor 31456 407478 86254 0 2 0 syz-executor 31456 11885 86254 0 3 0x4000080 fsleep syz-executor 29364 17351 34083 0 2 0 syz-executor *29364 74608 34083 0 7 0x4000000 syz-executor 16501 434721 76960 0 3 0x80 nanoslp syz-executor 16501 111684 76960 0 3 0x4000080 kqsel syz-executor 16501 48708 76960 0 3 0x4000080 kqsel syz-executor 16501 177130 76960 0 3 0x4000080 fsleep syz-executor 69075 404622 95485 -1 3 0x90 nanoslp syz-executor 69075 468154 95485 -1 3 0x4000090 fsleep syz-executor 69075 383946 95485 -1 3 0x4000090 lockf syz-executor 38168 218797 0 0 3 0x14200 acct acct 76960 323104 25283 0 3 0x82 nanoslp syz-executor 92604 384570 0 0 3 0x14200 bored sosplice 29951 84176 0 0 3 0x14280 nfsidl nfsio 46438 340394 0 0 3 0x14280 nfsidl nfsio 7131 505743 0 0 3 0x14280 nfsidl nfsio 73140 426820 0 0 3 0x14280 nfsidl nfsio 70027 224159 0 0 3 0x14280 nfsidl nfsio 71407 273582 0 0 3 0x14280 nfsidl nfsio 32013 96577 0 0 3 0x14280 nfsidl nfsio 25876 85267 0 0 3 0x14280 nfsidl nfsio 83486 270577 0 0 3 0x14280 nfsidl nfsio 94161 5524 0 0 3 0x14280 nfsidl nfsio 47626 274026 0 0 3 0x14280 nfsidl nfsio 25118 24450 0 0 3 0x14280 nfsidl nfsio 403 53484 0 0 3 0x14280 nfsidl nfsio 13436 143642 0 0 3 0x14280 nfsidl nfsio 57556 262918 0 0 3 0x14280 nfsidl nfsio 47441 72612 0 0 3 0x14280 nfsidl nfsio 43587 313041 0 0 3 0x14280 nfsidl nfsio 11979 306443 0 0 3 0x14280 nfsidl nfsio 78190 512287 0 0 3 0x14280 nfsidl nfsio 52409 47806 0 0 3 0x14280 nfsidl nfsio 48116 286259 25283 0 3 0x82 nanoslp syz-executor 34083 461596 25283 0 3 0x82 nanoslp syz-executor 95485 277932 25283 0 3 0x82 nanoslp syz-executor 19089 114096 25283 0 3 0x82 nanoslp syz-executor 86254 190911 25283 0 3 0x82 nanoslp syz-executor 12096 52452 25283 0 3 0x82 nanoslp syz-executor 38280 274527 25283 0 3 0x82 nanoslp syz-executor 25283 295371 39141 0 3 0x82 kqread syz-executor 39141 338163 88414 0 3 0x10008a sigsusp ksh 88414 73282 14211 0 3 0x98 kqread sshd-session 14211 371544 64517 0 3 0x92 kqread sshd-session 5990 19405 1 0 3 0x100083 ttyin getty 64517 481477 1 0 3 0x88 kqread sshd 40741 227691 27847 74 3 0x1100092 bpf pflogd 27847 3402 1 0 3 0x80 sbwait pflogd 29485 460048 36745 73 3 0x1100090 kqread syslogd 36745 276474 1 0 3 0x100082 sbwait syslogd 78500 387600 1 0 3 0x100080 kqread resolvd 46075 407770 13898 77 3 0x100092 kqread dhcpleased 823 450143 13898 77 3 0x100092 kqread dhcpleased 13898 341411 1 0 3 0x80 kqread dhcpleased 9594 35407 0 0 3 0x14200 bored smr 77238 103493 0 0 2 0x14200 zerothread 92392 7321 0 0 3 0x14200 aiodoned aiodoned 13667 35748 0 0 3 0x14200 syncer update 3632 485457 0 0 3 0x14200 cleaner cleaner 60440 252749 0 0 3 0x14200 reaper reaper 3317 483561 0 0 3 0x14200 pgdaemon pagedaemon 59028 222153 0 0 3 0x14200 bored viomb 78504 497376 0 0 3 0x40014200 acpi0 acpi0 31518 35885 0 0 3 0x40014200 idle1 45490 20502 0 0 3 0x14200 bored softnet1 11647 54471 0 0 2 0x14200 softnet0 5120 269971 0 0 3 0x14200 bored systqmp 58834 229121 0 0 3 0x14200 bored systq 3467 39764 0 0 3 0x14200 tmoslp softclockmp 52745 495997 0 0 3 0x40014200 tmoslp softclock 64076 500402 0 0 3 0x40014200 idle0 1 132005 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 29364 (syz-executor) thread 0xffff80003640afc0 (74608) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83929028) #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:746 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff800001490ad0) #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:631 #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:746 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10363 11759K 11759K 166960K 13343 0 pcb 17 16K 17K 166960K 268 0 rtable 216 11K 12K 166960K 516 0 pf 35 17K 67485K 166960K 160 0 ifaddr 41 7K 8K 166960K 109 0 ifgroup 55 2K 3K 166960K 190 0 sysctl 4 1K 9K 166960K 11 0 counters 68 36K 37K 166960K 338 0 ioctlops 0 0K 4K 166960K 1747 0 iov 0 0K 16K 166960K 68 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1505 95K 95K 166960K 2729 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 23 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 77 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 77K 166960K 1195 0 sigio 0 0K 0K 166960K 28 0 proc 72 115K 164K 166960K 647 0 subproc 72 4K 4K 166960K 82 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 487 0 in_multi 89 6K 7K 166960K 149 0 ether_multi 1 0K 0K 166960K 8 0 mrt 0 0K 0K 166960K 13 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 597 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 247 168K 182K 166960K 13063 0 UVM aobj 29 2K 2K 166960K 33 0 pinsyscall 43 86K 96K 166960K 2319 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 65 0 NDP 12 0K 2K 166960K 75 0 temp 79 8652K 8769K 166960K 44089 0 kqueue 13 20K 30K 166960K 262 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 120 107 0 104 1 0 1 1 0 8 0 rtentry 176 143 0 58 5 0 5 5 0 8 0 unpcb 144 843 0 825 15 14 1 6 0 8 0 syncache 336 9 0 9 2 2 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 736 315 0 308 7 6 1 7 0 8 0 arp 136 14 0 4 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 328 1148 0 1138 24 22 2 13 0 8 0 nd6 152 26 0 6 1 0 1 1 0 8 0 pkpcb 40 4 0 4 3 3 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 120 0 120 4 3 1 1 0 8 1 pppxif 1504 9 0 9 4 4 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 38 0 33 1 0 1 1 0 482 0 pffrnode 88 38 0 33 1 0 1 1 0 8 0 pffrent 40 175 0 170 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfrktable 1344 35 0 35 1 1 0 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 78 0 28 1 0 1 1 0 8 0 pfstkey 128 80 0 30 2 0 2 2 0 8 0 pfstate 384 79 0 29 5 0 5 5 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 rttmr 136 3 0 3 2 2 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 682 0 295 34 8 26 32 0 8 0 art_table 40 686 0 295 6 0 6 6 0 8 0 art_node 32 141 0 66 1 0 1 1 0 8 0 sysvmsgpl 40 48 0 44 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 70 0 60 1 0 1 1 0 8 0 shmpl 112 30 0 4 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 3722 0 2218 96 0 96 96 0 8 0 ffsino 296 3722 0 2218 117 0 117 117 0 8 0 nchpl 144 5460 0 3772 63 0 63 63 0 8 0 rtmask 32 13 0 13 3 2 1 1 0 8 1 uvmvnodes 80 4680 0 0 96 0 96 96 0 8 0 vnodes 216 4680 0 0 260 0 260 260 0 8 0 namei 1024 19562 0 19561 5 4 1 2 0 8 0 percpumem 16 184 0 135 1 0 1 1 0 8 0 kstatmem 264 116 0 90 6 4 2 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 4 0 4 3 3 0 1 0 8 0 scxspl 216 24930 0 24930 13 12 1 8 1 8 1 plimitpl 152 250 0 232 1 0 1 1 0 8 0 sigapl 424 1524 0 1454 8 0 8 8 0 8 0 knotepl 120 571 0 0 18 0 18 18 0 8 0 kqueuepl 224 518 0 507 7 5 2 3 0 8 0 pipepl 344 269 0 242 9 6 3 6 0 8 0 fdescpl 528 1477 0 1445 3 0 3 3 0 8 0 filepl 160 10228 0 9970 34 21 13 17 0 8 2 lockfpl 104 611 0 606 3 2 1 2 0 8 0 lockfspl 48 213 0 209 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 179 0 162 1 0 1 1 0 8 0 ucredpl 104 1702 0 1687 1 0 1 1 0 8 0 zombiepl 144 1456 0 1454 2 1 1 1 0 8 0 processpl 1232 1524 0 1454 6 0 6 6 0 8 0 procpl 664 3376 0 3296 10 3 7 8 0 8 0 sosppl 168 8 0 8 3 3 0 1 0 8 0 sockpl 752 2230 0 2199 40 35 5 18 0 8 0 mcl64k 65536 6 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 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mtagpl 96 12 0 0 1 0 1 1 0 8 0 mbufpl 256 226 0 0 15 0 15 15 0 8 0 bufpl 280 9216 0 3072 440 0 440 440 0 8 0 anonpl 32 11683 0 0 96 1 95 95 0 246 0 amapchunkpl 152 43060 0 42566 41 18 23 34 0 158 0 amappl16 200 4837 0 4786 37 30 7 15 0 8 0 amappl15 192 6 0 6 2 2 0 1 0 8 0 amappl14 184 119 0 107 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 2143 0 2111 3 1 2 2 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 19 0 17 1 0 1 1 0 8 0 amappl7 128 115 0 102 1 0 1 1 0 8 0 amappl6 120 197 0 193 1 0 1 1 0 8 0 amappl5 112 122 0 112 1 0 1 1 0 8 0 amappl4 104 314 0 293 1 0 1 1 0 8 0 amappl3 96 7434 0 7339 3 0 3 3 0 8 0 amappl2 88 1735 0 1654 2 0 2 2 0 8 0 amappl1 80 13354 0 12752 16 1 15 15 0 8 0 amappl 88 12185 0 12012 6 1 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 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 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 32 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1477 0 1445 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1477 0 1445 1 0 1 1 0 8 0 vmmpekpl 168 14104 0 14066 3 0 3 3 0 8 0 vmmpepl 168 97408 0 95353 121 28 93 105 0 357 0 vmsppl 488 1476 0 1445 6 1 5 5 0 8 0 rwobjpl 80 31900 0 26242 119 3 116 118 0 8 0 pdppl 4096 2962 0 2890 104 32 72 78 0 8 0 pvpl 32 18201 0 0 147 0 147 147 0 265 0 pmappl 256 1476 0 1445 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 299 0 56 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(ffffffff837b5ff0) 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(ffffffff83928e20) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83928e20) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a7eb980,ffff800000069c00) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83928e20) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83928e20) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83928e20) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83928e20) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80002a7ebcf0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a7ebcf0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7031820b8fb0, count: -14 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(fffffd806e478dc8,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e478db0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e478db0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8064621050,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd8064621050,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c4558b0) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003c4558b0) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff8000014908e8,fffffd806b99b100,ffff80003640afc0) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff8000014908e8,fffffd807ed35200,fffffd806b99b100,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff8000014908e8,fffffd806b99b100,ffff80003c455b38,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff80003640afc0,5,ffff80003c455cb8,e,ffff80003c455d70) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff80003640afc0,ffff80003c455e20,ffff80003c455d70) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003c455e20) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c455e20) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1bd01675cf0, count: -15