witness: lock order reversal: 1st 0xffff800010fd1be8 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd80689c1a38 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff830be9a1 -> 0xffffffff8306b4aa 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(fffffd80689c1a38,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80689c1a28,1) at rw_enter+0x122 rrw_enter(fffffd80689c1a28,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd80600d82b0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80600d82b0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800037284de8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800037284de8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fd1a40,fffffd806cd9e200,ffff80003723f980) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800010fd1a40,fffffd806e915300,fffffd806cd9e200,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800010fd1a40,fffffd806cd9e200,ffff800037285078,0,0,0) at sosend+0xa40 sendit(ffff80003723f980,6,ffff8000372851f0,0,ffff8000372852b0) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80003723f980,ffff800037285360,ffff8000372852b0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800037285360) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800037285360) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x38cefa37610, count: -15 ddb{1}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff800037284a40 rbx 0xfffffd80042c2140 rdx 0xffff800001290c40 rcx 0xffff80003723f980 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff800037284920 r9 0x8080808080808080 r10 0x87a1bb542711fef6 r11 0xfb2a017d2d37f829 r12 0 r13 0xfffffd8003adae00 r14 0x3 r15 0xffffffff rip 0xffffffff81610e15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800037284a30 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=249054 pid=30453 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003723f470,0xffffffff835f1e20 process=0xffff800037272d50 user=0xffff800037280000, vmspace=0xfffffd8063a2d3a8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 30453 469890 84297 0 2 0x10 syz-executor *30453 249054 84297 0 7 0x4000010 syz-executor 91093 113112 29990 0 7 0 syz-executor 91093 506428 29990 0 3 0x4000080 kqsel syz-executor 91093 172718 29990 0 3 0x4000080 kqsel syz-executor 96916 404463 21116 0 3 0x80 nanoslp syz-executor 96916 301775 21116 0 3 0x4000080 sbwait syz-executor 96916 305058 21116 0 3 0x4000080 fsleep syz-executor 91728 60952 50637 0 3 0x80 nanoslp syz-executor 91728 476260 50637 0 3 0x4000080 ttyin syz-executor 91728 84808 50637 0 3 0x4000080 fsleep syz-executor 52029 120335 54955 -1 3 0x90 nanoslp syz-executor 52029 399693 54955 -1 3 0x4000090 netcon syz-executor 52029 152071 54955 -1 3 0x4000090 fsleep syz-executor 52029 73579 54955 -1 3 0x4000090 fsleep syz-executor 17567 243305 19178 0 3 0x80 nanoslp syz-executor 17567 23156 19178 0 3 0x4000080 dtread syz-executor 17567 36010 19178 0 3 0x4000080 fsleep syz-executor 21116 458422 16725 0 3 0x82 nanoslp syz-executor 11249 503244 1 0 3 0x100083 ttyin getty 62892 44268 0 0 3 0x14280 nfsidl nfsio 85746 268215 0 0 3 0x14280 nfsidl nfsio 10005 407035 0 0 3 0x14280 nfsidl nfsio 54345 351233 0 0 3 0x14280 nfsidl nfsio 57848 433918 0 0 3 0x14280 nfsidl nfsio 43748 89158 0 0 3 0x14280 nfsidl nfsio 99488 49949 0 0 3 0x14280 nfsidl nfsio 71448 223404 0 0 3 0x14280 nfsidl nfsio 98840 324186 0 0 3 0x14280 nfsidl nfsio 70047 469701 0 0 3 0x14280 nfsidl nfsio 6085 156037 0 0 3 0x14280 nfsidl nfsio 21003 6260 0 0 3 0x14280 nfsidl nfsio 17918 310236 0 0 3 0x14280 nfsidl nfsio 24914 308668 0 0 3 0x14280 nfsidl nfsio 90720 119533 0 0 3 0x14280 nfsidl nfsio 81102 257009 0 0 3 0x14280 nfsidl nfsio 8946 88237 0 0 3 0x14280 nfsidl nfsio 90413 468816 0 0 3 0x14280 nfsidl nfsio 13394 298657 0 0 3 0x14280 nfsidl nfsio 24608 505162 0 0 3 0x14280 nfsidl nfsio 2716 154717 0 0 3 0x14200 acct acct 48946 231281 0 0 3 0x14200 bored sosplice 84297 165833 16725 0 3 0x82 nanoslp syz-executor 29990 18715 16725 0 3 0x82 nanoslp syz-executor 19178 429050 16725 0 3 0x82 nanoslp syz-executor 67340 81284 16725 0 3 0x82 nanoslp syz-executor 75228 453020 16725 0 3 0x82 nanoslp syz-executor 50637 364670 16725 0 3 0x82 nanoslp syz-executor 54955 498743 16725 0 3 0x82 nanoslp syz-executor 16725 155494 1578 0 3 0x82 kqread syz-executor 1578 434222 63209 0 3 0x10008a sigsusp ksh 63209 160858 78026 0 3 0x98 kqread sshd-session 78026 106498 18779 0 3 0x92 kqread sshd-session 18779 324785 1 0 3 0x88 kqread sshd 29784 96711 33668 74 3 0x1100092 bpf pflogd 33668 464780 1 0 3 0x80 sbwait pflogd 87776 271249 46890 73 3 0x1100090 kqread syslogd 46890 308943 1 0 3 0x100082 sbwait syslogd 40022 209685 1 0 3 0x100080 kqread resolvd 75513 418699 21343 77 3 0x100092 kqread dhcpleased 36223 46518 21343 77 3 0x100092 kqread dhcpleased 21343 8647 1 0 3 0x80 kqread dhcpleased 21411 156043 0 0 3 0x14200 bored smr 52917 45577 0 0 2 0x14200 zerothread 23814 479653 0 0 3 0x14200 aiodoned aiodoned 32579 185408 0 0 3 0x14200 syncer update 21115 253150 0 0 3 0x14200 cleaner cleaner 39009 63177 0 0 3 0x14200 reaper reaper 60528 303737 0 0 3 0x14200 pgdaemon pagedaemon 21772 133771 0 0 3 0x14200 bored viomb 52749 357125 0 0 3 0x40014200 acpi0 acpi0 4129 116592 0 0 3 0x40014200 idle1 30212 129802 0 0 3 0x14200 bored softnet3 3344 144266 0 0 3 0x14200 bored softnet2 57660 518852 0 0 3 0x14200 bored softnet1 63023 328159 0 0 3 0x14200 bored softnet0 72487 248135 0 0 3 0x14200 bored systqmp 7726 445565 0 0 3 0x14200 bored systq 90240 51862 0 0 3 0x14200 tmoslp softclockmp 35629 410490 0 0 3 0x40014200 tmoslp softclock 40142 362850 0 0 3 0x40014200 idle0 1 445747 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 30453 (syz-executor) thread 0xffff80003723f980 (249054) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8359d538) #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 (0xffff800010fd1be8) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10234 11297K 11577K 166960K 11885 0 pcb 21 12K 12K 166960K 93 0 rtable 249 7K 7K 166960K 434 0 pf 34 17K 25K 166960K 72 0 ifaddr 43 7K 7K 166960K 60 0 ifgroup 55 2K 2K 166960K 81 0 sysctl 2 0K 0K 166960K 2 0 counters 64 36K 36K 166960K 80 0 ioctlops 0 0K 4K 166960K 1520 0 iov 0 0K 12K 166960K 23 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1372 86K 87K 166960K 1716 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 24 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 89K 166960K 602 0 sigio 0 0K 0K 166960K 12 0 proc 72 91K 152K 166960K 617 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 46 0 in_multi 99 7K 7K 166960K 129 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 463 0 fusefs mount 1 32K 32K 166960K 1 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 252 73K 77K 166960K 7282 0 UVM aobj 19 2K 2K 166960K 21 0 pinsyscall 43 86K 104K 166960K 1761 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 23 0 NDP 12 0K 2K 166960K 40 0 temp 51 6821K 6892K 166960K 12648 0 kqueue 13 20K 34K 166960K 102 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 68 0 65 1 0 1 1 0 8 0 rtentry 112 133 0 17 4 0 4 4 0 8 0 unpcb 144 346 0 323 4 2 2 3 0 8 0 syncache 336 8 0 8 2 1 1 1 0 8 1 tcpqe 32 2 0 2 2 1 1 1 0 8 1 tcpcb 808 144 0 136 2 0 2 2 0 8 1 arp 120 21 0 3 1 0 1 1 0 8 0 inpcb 336 589 0 566 7 4 3 7 0 8 0 nd6 136 31 0 4 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 5 0 5 2 1 1 1 0 8 1 pffrag 232 4 0 0 1 0 1 1 0 482 0 pffrnode 88 4 0 0 1 0 1 1 0 8 0 pffrent 40 69 0 65 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 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 43 0 0 1 0 1 1 0 8 0 pfstkey 128 43 0 0 2 0 2 2 0 8 0 pfstate 376 43 0 0 5 0 5 5 0 8 0 pfrule 1344 23 0 17 2 0 2 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 519 0 60 29 0 29 29 0 8 0 art_table 32 521 0 60 4 0 4 4 0 8 0 art_node 16 132 0 27 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 6 1 0 1 1 0 8 0 semapl 112 21 0 11 1 0 1 1 0 8 0 shmpl 112 18 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2368 0 860 95 0 95 95 0 8 0 ffsino 272 2368 0 860 102 0 102 102 0 8 0 nchpl 144 3235 0 1542 63 0 63 63 0 8 0 uvmvnodes 80 2678 0 0 55 0 55 55 0 8 0 vnodes 216 2678 0 0 149 0 149 149 0 8 0 namei 1024 11096 0 11095 2 1 1 2 0 8 0 percpumem 16 54 0 8 1 0 1 1 0 8 0 kstatmem 264 40 0 16 2 0 2 2 0 8 0 scxspl 216 9805 0 9805 10 2 8 8 1 8 8 plimitpl 152 94 0 76 1 0 1 1 0 8 0 sigapl 424 937 0 865 9 0 9 9 0 8 0 futexpl 64 7342 0 7337 1 0 1 1 0 8 0 knotepl 120 548 0 0 17 0 17 17 0 8 0 kqueuepl 216 181 0 170 3 0 3 3 0 8 2 pipepl 320 181 0 154 4 1 3 4 0 8 0 fdescpl 496 897 0 865 5 0 5 5 0 8 0 filepl 152 4951 0 4679 16 2 14 14 0 8 3 lockfpl 104 172 0 168 1 0 1 1 0 8 0 lockfspl 48 75 0 71 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 43 0 26 1 0 1 1 0 8 0 ucredpl 104 751 0 735 1 0 1 1 0 8 0 zombiepl 144 867 0 865 1 0 1 1 0 8 0 processpl 1160 937 0 865 6 0 6 6 0 8 0 procpl 648 1724 0 1640 8 0 8 8 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 5 0 5 1 0 1 1 0 8 1 sockpl 664 1178 0 1129 12 5 7 12 0 8 2 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 141 0 0 18 0 18 18 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 10 0 0 1 0 1 1 0 8 0 mbufpl 256 174 0 0 11 0 11 11 0 8 0 bufpl 280 4047 0 100 282 0 282 282 0 8 0 anonpl 24 211739 0 208173 60 1 59 59 0 185 30 amapchunkpl 152 23733 0 23185 26 0 26 26 0 158 4 amappl16 200 5692 0 5667 15 1 14 14 0 8 10 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 130 0 118 1 0 1 1 0 8 0 amappl13 176 46 0 46 2 2 0 1 0 8 0 amappl12 168 1573 0 1541 3 1 2 2 0 8 0 amappl11 160 57 0 43 1 0 1 1 0 8 0 amappl10 152 30 0 30 1 1 0 1 0 8 0 amappl9 144 148 0 148 1 1 0 1 0 8 0 amappl8 136 21 0 19 1 0 1 1 0 8 0 amappl7 128 114 0 102 1 0 1 1 0 8 0 amappl6 120 200 0 198 1 0 1 1 0 8 0 amappl5 112 172 0 160 1 0 1 1 0 8 0 amappl4 104 342 0 324 1 0 1 1 0 8 0 amappl3 96 4388 0 4282 3 0 3 3 0 8 0 amappl2 88 1219 0 1131 3 0 3 3 0 8 0 amappl1 80 10142 0 9575 15 1 14 15 0 8 0 amappl 88 6827 0 6637 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 20 0 2 1 0 1 1 0 8 0 uaddrrnd 24 897 0 865 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 897 0 865 1 0 1 1 0 8 0 vmmpekpl 168 8954 0 8914 3 0 3 3 0 8 0 vmmpepl 168 64818 0 62895 95 0 95 95 0 357 4 vmsppl 448 896 0 865 6 2 4 5 0 8 0 rwobjpl 56 25052 0 21406 56 1 55 55 0 8 3 pdppl 4096 1801 0 1730 103 32 71 83 0 8 0 pvpl 32 16888 0 0 137 0 137 137 0 265 0 pmappl 248 896 0 865 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 393 0 43 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(ffffffff8349fff0) 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 __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(ffffffff8359d330) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8359d330) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 intr_handler(ffff80003378bf50,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc intr_handler(ffff80003378c0c0,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(ffffffff8359d330) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8359d330) 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 end of kernel end trace frame: 0x721a18668750, 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:437 witness_checkorder(fffffd80689c1a38,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80689c1a28,1) at rw_enter+0x122 rrw_enter(fffffd80689c1a28,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd80600d82b0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80600d82b0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800037284de8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800037284de8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fd1a40,fffffd806cd9e200,ffff80003723f980) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800010fd1a40,fffffd806e915300,fffffd806cd9e200,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800010fd1a40,fffffd806cd9e200,ffff800037285078,0,0,0) at sosend+0xa40 sendit(ffff80003723f980,6,ffff8000372851f0,0,ffff8000372852b0) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80003723f980,ffff800037285360,ffff8000372852b0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800037285360) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800037285360) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x38cefa37610, count: -15