witness: lock order reversal: 1st 0xffff800010fd4450 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd8065ed1d58 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff830a027e -> 0xffffffff8304f7ef 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+0x298 sys/kern/uipc_socket.c:877 #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:179 [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+0x3e3 sys/kern/uipc_socket.c:1386 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1231 #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [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(fffffd8065ed1d58,9,0) at witness_checkorder+0x1024 rw_enter(fffffd8065ed1d48,1) at rw_enter+0x122 rrw_enter(fffffd8065ed1d48,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8064806a70,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8064806a70,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff80002a134528) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80002a134528) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fd42a8,fffffd806cbbd400,ffff8000371ed700) at unp_connect+0x27d sys/kern/uipc_usrreq.c:862 uipc_dgram_send(ffff800010fd42a8,fffffd80647f8300,fffffd806cbbd400,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:601 sosend(ffff800010fd42a8,fffffd806cbbd400,ffff80002a1347b8,0,0,0) at sosend+0xa43 sendit(ffff8000371ed700,5,ffff80002a134930,0,ffff80002a1349f0) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000371ed700,ffff80002a134aa0,ffff80002a1349f0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff80002a134aa0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a134aa0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x45b6c3af510, count: -15 ddb{1}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff80002a134180 rbx 0xffffffff83061629 pp_r600_decoded_lanes+0x34594 rdx 0xffff80000118a880 rcx 0xffff8000371ed700 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff80002a134060 r9 0x8080808080808080 r10 0x2f5cc52a5d209931 r11 0x6fa746b337a338bb r12 0xfffffd80042a0bd0 r13 0xfffffd8003ab7dc0 r14 0x3 r15 0xffffffff rip 0xffffffff816cefe5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a134170 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=194217 pid=17727 tcnt=2 stat=onproc flags process=8000000 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000371ecce0,0xffff8000371edc20 process=0xffff80003724e8a8 user=0xffff80002a12f000, vmspace=0xfffffd806c688018 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 56985 130371 81305 0 2 0x8000000 syz-executor 23424 461218 99850 0 2 0x8000000 syz-executor 17727 381683 12966 0 7 0x8000000 syz-executor *17727 194217 12966 0 7 0xc000000 syz-executor 50301 325046 55442 0 2 0x8000000 syz-executor 50301 73250 55442 0 2 0xc000000 syz-executor 58013 309354 17381 0 3 0x8000080 nanoslp syz-executor 58013 27374 17381 0 3 0xc000080 ttyin syz-executor 16075 170760 51143 0 3 0x8000080 nanoslp syz-executor 16075 304848 51143 0 3 0xc000080 fsleep syz-executor 16075 223514 51143 0 3 0xc000080 kqsel syz-executor 16075 316794 51143 0 3 0xc000080 fsleep syz-executor 17381 245541 21501 0 3 0x8000082 nanoslp syz-executor 51143 402167 21501 0 3 0x8000082 nanoslp syz-executor 12966 434966 21501 0 3 0x8000082 nanoslp syz-executor 99850 411007 21501 0 3 0x8000082 nanoslp syz-executor 55442 331135 21501 0 3 0x8000082 nanoslp syz-executor 81305 281801 21501 0 3 0x8000082 nanoslp syz-executor 4770 511143 21501 0 3 0x8000082 nanoslp syz-executor 76861 18124 0 0 3 0x14280 nfsidl nfsio 69237 499980 0 0 3 0x14280 nfsidl nfsio 57564 464262 0 0 3 0x14280 nfsidl nfsio 28419 199788 0 0 3 0x14280 nfsidl nfsio 63820 139037 0 0 3 0x14280 nfsidl nfsio 28760 410477 0 0 3 0x14280 nfsidl nfsio 53452 371691 0 0 3 0x14280 nfsidl nfsio 8553 287948 0 0 3 0x14280 nfsidl nfsio 89025 453544 0 0 3 0x14280 nfsidl nfsio 30859 30232 0 0 3 0x14280 nfsidl nfsio 33230 96513 0 0 3 0x14280 nfsidl nfsio 43213 444174 0 0 3 0x14280 nfsidl nfsio 45878 488559 0 0 3 0x14280 nfsidl nfsio 23735 50885 0 0 3 0x14280 nfsidl nfsio 27971 405652 0 0 3 0x14280 nfsidl nfsio 72175 90353 0 0 3 0x14280 nfsidl nfsio 35586 131643 0 0 3 0x14280 nfsidl nfsio 49197 170289 0 0 3 0x14280 nfsidl nfsio 59789 332296 0 0 3 0x14280 nfsidl nfsio 26172 207688 0 0 3 0x14280 nfsidl nfsio 81544 164437 0 0 3 0x14200 bored sosplice 6999 458573 26646 0 3 0x18100082 sbwait ndp 26646 441870 95733 0 3 0x810008a sigsusp sh 95733 344889 21501 0 3 0x8000082 wait syz-executor 21501 225532 91104 0 3 0x8000082 kqread syz-executor 91104 46416 16989 0 3 0x810008a sigsusp ksh 16989 501280 38617 0 3 0x18000098 kqread sshd-session 38617 515175 34364 0 3 0x18000092 kqread sshd-session 71887 117851 1 0 3 0x18100083 ttyopn getty 34364 91259 1 0 3 0x18000088 kqread sshd 28044 189567 80447 74 3 0x19100092 bpf pflogd 80447 257756 1 0 3 0x18000080 sbwait pflogd 75463 479825 62567 73 2 0x19100010 syslogd 62567 204239 1 0 3 0x18100082 sbwait syslogd 96782 262831 1 0 3 0x18100080 kqread resolvd 93616 243898 87932 77 3 0x18100092 kqread dhcpleased 80608 124842 87932 77 3 0x18100092 kqread dhcpleased 87932 67873 1 0 3 0x18000080 kqread dhcpleased 35600 193461 0 0 3 0x14200 bored smr 78647 208224 0 0 2 0x14200 zerothread 91938 429949 0 0 3 0x14200 aiodoned aiodoned 21772 348254 0 0 3 0x14200 syncer update 12931 138925 0 0 3 0x14200 cleaner cleaner 48545 498255 0 0 3 0x14200 reaper reaper 96526 490327 0 0 3 0x14200 pgdaemon pagedaemon 81599 330221 0 0 3 0x14200 bored viomb 31526 58148 0 0 3 0x40014200 acpi0 acpi0 15086 270600 0 0 3 0x40014200 idle1 72569 319225 0 0 3 0x14200 bored softnet3 26714 361479 0 0 3 0x14200 bored softnet2 62815 33946 0 0 3 0x14200 bored softnet1 89190 4583 0 0 3 0x14200 bored softnet0 51382 355406 0 0 3 0x14200 bored systqmp 54237 294048 0 0 3 0x14200 bored systq 15969 155959 0 0 3 0x14200 tmoslp softclockmp 35929 298788 0 0 3 0x40014200 tmoslp softclock 82729 415770 0 0 3 0x40014200 idle0 1 21299 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 17727 (syz-executor) thread 0xffff8000371ed700 (194217) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff834f5130) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 unp_connect+0x26c sys/kern/uipc_usrreq.c:862 #2 uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:601 #3 sosend+0xa43 #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:179 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff800010fd4450) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #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:611 #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:179 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 75463 (syslogd) thread 0xffff8000ffffd1c8 (479825) exclusive rrwlock inode r = 0 (0xfffffd806e4775f0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #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 sys_fsync+0x152 sys/kern/vfs_syscalls.c:2931 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10202 10229K 10774K 166960K 12830 0 pcb 17 12K 12K 166960K 112 0 rtable 209 15K 16K 166960K 878 0 pf 34 9K 10K 166960K 99 0 ifaddr 40 14K 16K 166960K 121 0 ifgroup 59 2K 2K 166960K 151 0 sysctl 4 1K 1K 166960K 4 0 counters 66 36K 37K 166960K 118 0 ioctlops 0 0K 4K 166960K 1530 0 iov 0 0K 24K 166960K 31 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1434 90K 91K 166960K 2522 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 5K 9K 166960K 21 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 56 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 19 69K 85K 166960K 901 0 sigio 0 0K 0K 166960K 12 0 proc 70 91K 152K 166960K 965 0 subproc 104 6K 6K 166960K 286 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 223 0 in_multi 77 5K 7K 166960K 266 0 ether_multi 1 0K 0K 166960K 4 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 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 605 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 231 73K 91K 166960K 9363 0 UVM aobj 25 2K 2K 166960K 30 0 pinsyscall 45 90K 104K 166960K 2344 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 97 0 NDP 13 0K 1K 166960K 83 0 temp 75 6815K 6898K 166960K 26219 0 kqueue 14 22K 28K 166960K 113 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 120 117 0 112 1 0 1 1 0 8 0 rtentry 112 287 0 196 4 0 4 4 0 8 0 unpcb 144 844 0 825 8 6 2 4 0 8 1 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 808 268 0 264 9 8 1 8 0 8 0 arp 120 49 0 34 1 0 1 1 0 8 0 inpcb 384 1089 0 1078 16 14 2 9 0 8 0 nd6 136 80 0 61 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 22 0 14 1 0 1 1 0 8 0 ppxss 1168 7 0 7 3 2 1 1 0 8 1 pffrag 232 7 0 3 1 0 1 1 0 482 0 pffrnode 88 7 0 3 1 0 1 1 0 8 0 pffrent 40 96 0 91 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 24 105 0 54 1 0 1 1 0 8 0 pfstkey 128 105 0 54 2 0 2 2 0 8 0 pfstate 376 105 0 53 6 0 6 6 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1119 0 744 34 4 30 30 0 8 0 art_table 32 1120 0 744 4 0 4 4 0 8 0 art_node 16 286 0 204 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 9 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 51 0 41 1 0 1 1 0 8 0 shmpl 112 27 0 5 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2858 0 1330 96 0 96 96 0 8 0 ffsino 272 2858 0 1330 103 0 103 103 0 8 0 nchpl 144 3914 0 2212 64 0 64 64 0 8 0 uvmvnodes 80 3698 0 0 76 0 76 76 0 8 0 vnodes 216 3698 0 0 206 0 206 206 0 8 0 namei 1024 14881 0 14880 3 2 1 2 0 8 0 percpumem 16 73 0 26 1 0 1 1 0 8 0 vcpupl 3904 5 0 0 1 0 1 1 0 8 0 vmpool 696 8 0 3 1 0 1 1 0 8 0 kstatmem 264 78 0 52 3 1 2 3 0 8 0 scsiplug 72 4 0 4 2 2 0 1 0 8 0 scxspl 216 18116 0 18116 11 9 2 8 1 8 2 plimitpl 152 337 0 320 1 0 1 1 0 8 0 sigapl 424 1196 0 1124 10 1 9 9 0 8 0 futexpl 64 9938 0 9936 3 2 1 1 0 8 0 knotepl 120 571 0 0 17 0 17 17 0 8 0 kqueuepl 216 212 0 201 1 0 1 1 0 8 0 pipepl 320 214 0 186 3 0 3 3 0 8 0 fdescpl 496 1156 0 1123 6 1 5 5 0 8 0 filepl 152 7882 0 7628 22 10 12 16 0 8 1 lockfpl 104 306 0 304 1 0 1 1 0 8 0 lockfspl 48 141 0 139 1 0 1 1 0 8 0 sessionpl 144 36 0 27 1 0 1 1 0 8 0 pgrppl 48 64 0 47 1 0 1 1 0 8 0 ucredpl 104 1575 0 1561 1 0 1 1 0 8 0 zombiepl 144 1125 0 1124 1 0 1 1 0 8 0 processpl 1152 1196 0 1124 6 0 6 6 0 8 0 procpl 648 2259 0 2181 9 1 8 8 0 8 0 srpgc 96 6 0 6 2 1 1 1 0 8 1 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 664 2062 0 2028 20 15 5 15 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 223 0 0 28 0 28 28 0 8 0 mtagpl 96 71 0 0 2 0 2 2 0 8 0 mbufpl 256 447 0 0 28 0 28 28 0 8 0 bufpl 280 6052 0 102 425 0 425 425 0 8 0 anonpl 24 213205 0 209725 54 3 51 51 0 185 23 amapchunkpl 152 30284 0 29830 31 0 31 31 0 158 10 amappl16 200 4813 0 4791 30 16 14 14 0 8 12 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 145 0 132 1 0 1 1 0 8 0 amappl13 176 12 0 12 1 1 0 1 0 8 0 amappl12 168 2025 0 1993 4 2 2 3 0 8 0 amappl11 160 66 0 52 1 0 1 1 0 8 0 amappl10 152 32 0 32 1 1 0 1 0 8 0 amappl9 144 137 0 137 2 2 0 1 0 8 0 amappl8 136 20 0 18 1 0 1 1 0 8 0 amappl7 128 139 0 126 1 0 1 1 0 8 0 amappl6 120 302 0 299 1 0 1 1 0 8 0 amappl5 112 201 0 189 1 0 1 1 0 8 0 amappl4 104 376 0 355 1 0 1 1 0 8 0 amappl3 96 6049 0 5942 4 0 4 4 0 8 0 amappl2 88 816 0 749 2 0 2 2 0 8 0 amappl1 80 10876 0 10261 15 0 15 15 0 8 0 amappl 88 8846 0 8685 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 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 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 29 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1164 0 1126 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1164 0 1126 1 0 1 1 0 8 0 vmmpekpl 168 10749 0 10694 4 0 4 4 0 8 0 vmmpepl 168 77517 0 75582 106 9 97 97 0 357 10 vmsppl 440 1163 0 1126 6 1 5 5 0 8 0 rwobjpl 56 28263 0 23568 70 1 69 69 0 8 2 pdppl 4096 2335 0 2257 115 37 78 81 0 8 0 pvpl 32 27156 0 0 220 1 219 219 0 265 0 pmappl 248 1163 0 1126 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 431 0 57 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8343eff0) 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(ffffffff834f4f28) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff834f4f28) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003299fac0,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff834f4f28) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff834f4f28) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003299fc20,ffff80000006c000) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge25_untramp() at Xintr_ioapic_edge25_untramp+0x18f __mp_lock(ffffffff834f4f28) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff834f4f28) 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: 0x7f6131e773c0, 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(fffffd8065ed1d58,9,0) at witness_checkorder+0x1024 rw_enter(fffffd8065ed1d48,1) at rw_enter+0x122 rrw_enter(fffffd8065ed1d48,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8064806a70,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8064806a70,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff80002a134528) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80002a134528) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fd42a8,fffffd806cbbd400,ffff8000371ed700) at unp_connect+0x27d sys/kern/uipc_usrreq.c:862 uipc_dgram_send(ffff800010fd42a8,fffffd80647f8300,fffffd806cbbd400,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:601 sosend(ffff800010fd42a8,fffffd806cbbd400,ffff80002a1347b8,0,0,0) at sosend+0xa43 sendit(ffff8000371ed700,5,ffff80002a134930,0,ffff80002a1349f0) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000371ed700,ffff80002a134aa0,ffff80002a1349f0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff80002a134aa0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a134aa0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x45b6c3af510, count: -15