witness: lock order reversal: 1st 0xffff8000013f1be8 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806b435c58 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff830bd238 -> 0xffffffff8306e212 is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 soreceive+0x295 sys/kern/uipc_socket.c:945 #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+0xf6 sys/kern/vfs_vnops.c:525 #10 sys_ioctl+0x67c #11 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #11 syscall+0xbb6 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_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 sosplice+0x3f4 sys/kern/uipc_socket.c:1454 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1228 #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 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(fffffd806b435c58,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806b435c48,1) at rw_enter+0x122 rrw_enter(fffffd806b435c48,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8060451980,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8060451980,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800037211998) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800037211998) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000013f1a40,fffffd806fa2d400,ffff80003339d978) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000013f1a40,fffffd805f553800,fffffd806fa2d400,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000013f1a40,fffffd806fa2d400,ffff800037211c28,0,0,8) at sosend+0xa40 sendit(ffff80003339d978,3,ffff800037211da0,8,ffff800037211e60) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80003339d978,ffff800037211f10,ffff800037211e60) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800037211f10) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800037211f10) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x82ffdbf0ab0, count: -15 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff8000372115f0 rbx 0xfffffd80042c7c58 rdx 0 rcx 0xffff80003339d978 rax 0xffff800029b7bff0 r8 0xffff8000372114d0 r9 0x8080808080808080 r10 0x102bde47053b07cc r11 0xf62f94789b75ec31 r12 0 r13 0xfffffd8003adee00 r14 0x3 r15 0xffffffff rip 0xffffffff81ac00e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000372115e0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=435663 pid=22698 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=0xffff80003339c7c0,0xffffffff836345a0 process=0xffff8000371d3680 user=0xffff80003720c000, vmspace=0xfffffd806b3228e8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 22698 201777 21725 0 3 0x80 fsleep syz-executor *22698 435663 21725 0 7 0x4000000 syz-executor 88932 405336 24929 0 3 0x80 fsleep syz-executor 88932 430062 24929 0 3 0x4000080 pipewr syz-executor 16929 464838 1 0 3 0x82 nanoslp getty 92433 85456 13453 0 3 0x80 fsleep syz-executor 92433 252868 13453 0 3 0x4000080 piperd syz-executor 64778 358614 8606 0 3 0x80 fsleep syz-executor 64778 208672 8606 0 3 0x4000080 wsevent_read syz-executor 91163 253248 94748 0 3 0x80 fsleep syz-executor 91163 59424 94748 0 3 0x4000080 ttyin syz-executor 53168 305285 24024 0 3 0x80 fsleep syz-executor 53168 119587 24024 0 3 0x4000080 sbwait syz-executor 2301 453380 3961 0 3 0x80 fsleep syz-executor 2301 489612 3961 0 3 0x4000080 sbwait syz-executor 73131 98525 93333 0 3 0x80 fsleep syz-executor 73131 98476 93333 0 3 0x4000080 sbwait syz-executor 73131 126565 93333 0 3 0x4000080 fsleep syz-executor 73131 463590 93333 0 3 0x4000000 sbufrcv syz-executor 93333 319791 95001 0 3 0x82 wait syz-executor 82907 59833 0 0 3 0x14200 bored sosplice 73256 275799 0 0 3 0x14200 acct acct 24929 98658 95001 0 3 0x82 nanoslp syz-executor 3961 345191 95001 0 3 0x82 nanoslp syz-executor 94748 157569 95001 0 3 0x82 nanoslp syz-executor 8606 249150 95001 0 3 0x82 nanoslp syz-executor 24024 520688 95001 0 3 0x82 nanoslp syz-executor 13453 510885 95001 0 3 0x82 nanoslp syz-executor 21725 116792 95001 0 3 0x82 nanoslp syz-executor 95001 354549 7658 0 3 0x82 kqread syz-executor 7658 102579 40275 0 3 0x10008a sigsusp ksh 40275 344571 37563 0 3 0x98 kqread sshd-session 37563 49508 88982 0 3 0x92 kqread sshd-session 88982 148617 1 0 3 0x88 kqread sshd 96858 132009 33629 74 3 0x1100092 bpf pflogd 33629 426612 1 0 3 0x80 sbwait pflogd 4153 221191 13748 73 3 0x1100090 kqread syslogd 13748 401412 1 0 3 0x100082 sbwait syslogd 42210 131000 1 0 3 0x100080 kqread resolvd 92664 34215 49290 77 3 0x100092 kqread dhcpleased 67371 167578 49290 77 3 0x100092 kqread dhcpleased 49290 243929 1 0 3 0x80 kqread dhcpleased 63372 33870 0 0 3 0x14200 bored smr 27262 322852 0 0 3 0x14200 pgzero zerothread 42078 505780 0 0 3 0x14200 aiodoned aiodoned 68240 368898 0 0 3 0x14200 syncer update 24227 370041 0 0 3 0x14200 cleaner cleaner 5323 127472 0 0 3 0x14200 reaper reaper 20670 469698 0 0 3 0x14200 pgdaemon pagedaemon 36309 129405 0 0 3 0x14200 bored viomb 1913 281058 0 0 3 0x40014200 acpi0 acpi0 9534 197544 0 0 3 0x40014200 idle1 98024 441923 0 0 3 0x14200 bored softnet3 45535 38657 0 0 3 0x14200 bored softnet2 68871 497152 0 0 3 0x14200 bored softnet1 66384 55399 0 0 3 0x14200 bored softnet0 21672 23630 0 0 3 0x14200 bored systqmp 74968 430121 0 0 3 0x14200 bored systq 62126 302627 0 0 3 0x14200 tmoslp softclockmp 50613 476457 0 0 3 0x40014200 tmoslp softclock 62937 262522 0 0 7 0x40014200 idle0 1 4733 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 22698 (syz-executor) thread 0xffff80003339d978 (435663) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835a0b68) #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+0xa40 #4 sendit+0x721 sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff8000013f1be8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 sblock+0xb7 sys/kern/uipc_socket2.c:549 #3 sosend+0x2ff sys/kern/uipc_socket.c:681 #4 sendit+0x721 sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 64778 (syz-executor) thread 0xffff8000ffff7bf8 (208672) exclusive rrwlock inode r = 0 (0xfffffd806b4352c8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 spec_open+0x302 sys/kern/spec_vnops.c:151 #6 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #7 vn_open+0x708 sys/kern/vfs_vnops.c:177 #8 vndioctl+0xcb1 sys/dev/vnd.c:457 #9 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525 #11 sys_ioctl+0x67c #12 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #12 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 Process 73131 (syz-executor) thread 0xffff8000371cf980 (98476) exclusive rwlock sbufrcv r = 0 (0xffff8000012948a8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 sblock+0xb7 sys/kern/uipc_socket2.c:549 #3 soreceive+0x295 sys/kern/uipc_socket.c:945 #4 recvit+0x40a sys/kern/uipc_syscalls.c:1079 #5 sys_recvmmsg+0x3d3 sys/kern/uipc_syscalls.c:970 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10237 11207K 11652K 166960K 12335 0 pcb 18 16K 18K 166960K 294 0 rtable 212 7K 8K 166960K 474 0 pf 41 18K 25K 166960K 86 0 ifaddr 45 7K 8K 166960K 69 0 ifgroup 64 2K 2K 166960K 89 0 sysctl 3 0K 0K 166960K 3 0 counters 68 36K 37K 166960K 88 0 ioctlops 0 0K 4K 166960K 1552 0 iov 2 5K 17K 166960K 51 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1421 89K 90K 166960K 2142 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 39 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 1004 0 sigio 0 0K 0K 166960K 19 0 proc 72 91K 128K 166960K 640 0 subproc 104 6K 6K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 147 0 in_multi 102 7K 7K 166960K 154 0 ether_multi 1 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 2 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 482 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 245 73K 86K 166960K 11158 0 UVM aobj 21 2K 2K 166960K 23 0 pinsyscall 43 86K 104K 166960K 2173 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 120 0 NDP 15 0K 2K 166960K 46 0 temp 62 6824K 6892K 166960K 48683 0 kqueue 17 24K 28K 166960K 120 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 89 0 86 1 0 1 1 0 8 0 rtentry 112 143 0 47 4 0 4 4 0 8 0 unpcb 144 765 0 737 8 2 6 6 0 8 4 syncache 336 10 0 10 3 2 1 1 0 8 1 tcpcb 808 332 0 328 5 4 1 4 0 8 0 arp 120 26 0 8 1 0 1 1 0 8 0 inpcb 336 1195 0 1187 12 5 7 7 0 8 6 nd6 136 32 0 8 1 0 1 1 0 8 0 pkpcb 40 2 0 2 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 8 0 8 2 1 1 1 0 8 1 pfstscr 40 4 0 4 1 1 0 1 0 8 0 pffrag 232 20 0 17 1 0 1 1 0 482 0 pffrnode 88 20 0 17 1 0 1 1 0 8 0 pffrent 40 38 0 35 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 68 0 23 1 0 1 1 0 8 0 pfstkey 128 70 0 25 2 0 2 2 0 8 0 pfstate 376 69 0 25 5 0 5 5 0 8 0 pfrule 1344 24 0 18 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 610 0 114 32 0 32 32 0 8 1 art_table 32 611 0 114 5 0 5 5 0 8 0 art_node 16 142 0 56 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 2 1 0 1 1 0 8 0 semapl 112 36 0 26 1 0 1 1 0 8 0 shmpl 112 20 0 2 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 3143 0 1636 95 0 95 95 0 8 0 ffsino 272 3143 0 1636 102 0 102 102 0 8 0 nchpl 144 4519 0 2826 63 0 63 63 0 8 0 uvmvnodes 80 3653 0 0 75 0 75 75 0 8 0 vnodes 216 3653 0 0 203 0 203 203 0 8 0 namei 1024 15896 0 15895 2 1 1 2 0 8 0 percpumem 16 58 0 10 1 0 1 1 0 8 0 kstatmem 264 48 0 20 3 0 3 3 0 8 1 scsiplug 72 4 0 4 3 3 0 1 0 8 0 scxspl 216 13162 0 13162 15 12 3 8 1 8 3 plimitpl 152 277 0 260 1 0 1 1 0 8 0 sigapl 424 1321 0 1269 8 2 6 7 0 8 0 futexpl 64 15443 0 15434 1 0 1 1 0 8 0 knotepl 120 546 0 0 17 0 17 17 0 8 0 kqueuepl 216 301 0 289 5 2 3 5 0 8 2 pipepl 320 265 0 236 8 0 8 8 0 8 5 fdescpl 496 1301 0 1269 5 0 5 5 0 8 0 filepl 152 9153 0 8886 22 4 18 18 0 8 7 lockfpl 104 398 0 393 1 0 1 1 0 8 0 lockfspl 48 119 0 114 1 0 1 1 0 8 0 sessionpl 144 29 0 21 1 0 1 1 0 8 0 pgrppl 48 49 0 33 1 0 1 1 0 8 0 ucredpl 104 1893 0 1879 1 0 1 1 0 8 0 zombiepl 144 1269 0 1269 1 0 1 1 0 8 1 processpl 1160 1321 0 1269 5 1 4 5 0 8 0 procpl 648 2719 0 2657 7 1 6 6 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 3 0 3 2 1 1 1 0 8 1 sockpl 664 2071 0 2032 26 14 12 20 0 8 8 mcl64k 65536 5 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 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 134 0 0 17 0 17 17 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 31 0 0 1 0 1 1 0 8 0 mbufpl 256 625 0 0 39 0 39 39 0 8 0 bufpl 280 5055 0 103 354 0 354 354 0 8 0 anonpl 24 254485 0 250146 58 19 39 51 0 185 4 amapchunkpl 152 36829 0 36262 33 7 26 32 0 158 2 amappl16 200 6698 0 6663 32 29 3 15 0 8 0 amappl15 192 13 0 13 1 1 0 1 0 8 0 amappl14 184 138 0 126 1 0 1 1 0 8 0 amappl13 176 13 0 13 1 1 0 1 0 8 0 amappl12 168 1995 0 1962 4 2 2 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 10 0 10 1 1 0 1 0 8 0 amappl9 144 133 0 133 1 1 0 1 0 8 0 amappl8 136 33 0 30 1 0 1 1 0 8 0 amappl7 128 121 0 109 1 0 1 1 0 8 0 amappl6 120 195 0 194 1 0 1 1 0 8 0 amappl5 112 149 0 137 1 0 1 1 0 8 0 amappl4 104 350 0 329 1 0 1 1 0 8 0 amappl3 96 6739 0 6642 3 0 3 3 0 8 0 amappl2 88 1652 0 1566 3 0 3 3 0 8 0 amappl1 80 11693 0 11122 16 2 14 14 0 8 0 amappl 88 10687 0 10504 5 0 5 5 0 92 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 8 0 8 2 2 0 1 0 8 0 dma128 128 256 0 256 4 4 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 22 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1301 0 1269 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1301 0 1269 1 0 1 1 0 8 0 vmmpekpl 168 11964 0 11922 3 0 3 3 0 8 0 vmmpepl 168 88416 0 86492 99 9 90 95 0 357 0 vmsppl 448 1300 0 1269 6 2 4 5 0 8 0 rwobjpl 56 31494 0 26878 67 1 66 66 0 8 0 pdppl 4096 2609 0 2538 117 44 73 85 0 8 2 pvpl 32 15382 0 0 125 1 124 124 0 265 0 pmappl 248 1300 0 1269 4 1 3 3 0 8 1 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 448 0 63 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff834f2ff0) 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(ffffffff835a0960) at __mp_lock+0x19e __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835a0960) at __mp_lock+0x19e sys/kern/kern_lock.c:144 intr_handler(ffff800029f955d0,ffff800000079e00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f __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(ffffffff835a0960) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835a0960) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffffffff834f2ff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, 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(fffffd806b435c58,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806b435c48,1) at rw_enter+0x122 rrw_enter(fffffd806b435c48,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8060451980,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8060451980,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800037211998) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800037211998) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000013f1a40,fffffd806fa2d400,ffff80003339d978) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000013f1a40,fffffd805f553800,fffffd806fa2d400,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000013f1a40,fffffd806fa2d400,ffff800037211c28,0,0,8) at sosend+0xa40 sendit(ffff80003339d978,3,ffff800037211da0,8,ffff800037211e60) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80003339d978,ffff800037211f10,ffff800037211e60) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800037211f10) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800037211f10) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x82ffdbf0ab0, count: -15