login: witness: lock order reversal: 1st 0xffff800001291200 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd805f9ceed8 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83120c01 -> 0xffffffff830cf67f 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:537 #2 soreceive+0x28e sys/kern/uipc_socket.c:876 #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:537 #2 sosplice+0x40d sys/kern/uipc_socket.c:1358 #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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd805f9ceed8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd805f9ceec0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd805f9ceec0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8075bb5bf0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8075bb5bf0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff800034563eb8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800034563eb8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800001291040,fffffd8062454400,ffff8000ffff67c0) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800001291040,fffffd80623fff00,fffffd8062454400,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800001291040,fffffd8062454400,ffff800034564138,0,0,0) at sosend+0x804 sendit(ffff8000ffff67c0,3,ffff8000345642b0,0,ffff800034564370) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff8000ffff67c0,ffff800034564420,ffff800034564370) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff800034564420) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034564420) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4abd96ed120, count: -15 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800034563b30 rbx 0xfffffd800433e7a0 rdx 0 rcx 0xffff8000ffff67c0 rax 0xffffffff834ccff0 cpu_info_full_primary+0x1ff0 r8 0xffff800034563a10 r9 0x8080808080808080 r10 0xce8a64ad059724f3 r11 0xb9663d96cba669 r12 0 r13 0xfffffd8003b56f00 r14 0x3 r15 0xffffffff rip 0xffffffff82a6fbd5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800034563b20 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=193928 pid=38964 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=0xffff8000ffff6028,0xffffffff8360c558 process=0xffff80003c643910 user=0xffff80003455f000, vmspace=0xfffffd806c00c018 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38964 197915 27973 0 3 0x80 fsleep syz-executor *38964 193928 27973 0 7 0x4000000 syz-executor 22475 35757 63323 0 3 0x80 fsleep syz-executor 22475 485385 63323 0 3 0x4000080 netacc syz-executor 28565 13651 50964 0 3 0x80 fsleep syz-executor 28565 125630 50964 0 3 0x4000080 fsleep syz-executor 28565 256140 50964 0 3 0x4000080 sbwait syz-executor 28565 498558 50964 0 3 0x4000080 fsleep syz-executor 99170 101473 49586 0 3 0x80 fsleep syz-executor 99170 5269 49586 0 3 0x4000080 bell syz-executor 99170 170124 49586 0 3 0x4000080 bell syz-executor 93702 298865 55946 0 3 0x80 fsleep syz-executor 93702 36930 55946 0 3 0x4000080 pipewr syz-executor 63464 394573 2033 0 3 0x80 fsleep syz-executor 63464 450128 2033 0 3 0x4000080 fsleep syz-executor 63464 66682 2033 0 3 0x4000080 fifor syz-executor 7789 299539 76829 60928 3 0x90 fsleep syz-executor 7789 309278 76829 60928 3 0x4000090 lockf syz-executor 7546 270036 83382 0 3 0x80 fsleep syz-executor 7546 256157 83382 0 3 0x4000080 sbwait syz-executor 73433 84176 1 0 3 0x100083 ttyin getty 76829 145489 8565 0 3 0x82 nanoslp syz-executor 52341 70802 0 0 3 0x14280 nfsidl nfsio 59207 419908 0 0 3 0x14280 nfsidl nfsio 39 211759 0 0 3 0x14280 nfsidl nfsio 10015 351853 0 0 3 0x14280 nfsidl nfsio 2840 177603 0 0 3 0x14280 nfsidl nfsio 14732 308542 0 0 3 0x14280 nfsidl nfsio 33499 425068 0 0 3 0x14280 nfsidl nfsio 56559 139932 0 0 3 0x14280 nfsidl nfsio 65480 401570 0 0 3 0x14280 nfsidl nfsio 92624 423725 0 0 3 0x14280 nfsidl nfsio 6357 72243 0 0 3 0x14280 nfsidl nfsio 7935 249078 0 0 3 0x14280 nfsidl nfsio 38677 14417 0 0 3 0x14280 nfsidl nfsio 43513 379825 0 0 3 0x14280 nfsidl nfsio 5353 329355 0 0 3 0x14280 nfsidl nfsio 50651 359936 0 0 3 0x14280 nfsidl nfsio 145 379494 0 0 3 0x14280 nfsidl nfsio 1981 457707 0 0 3 0x14280 nfsidl nfsio 95057 83306 0 0 3 0x14280 nfsidl nfsio 19025 393857 0 0 3 0x14280 nfsidl nfsio 57745 58971 0 0 3 0x14200 bored sosplice 27973 87172 8565 0 3 0x82 nanoslp syz-executor 50964 180287 8565 0 3 0x82 nanoslp syz-executor 55946 167863 8565 0 3 0x82 nanoslp syz-executor 83382 373806 8565 0 3 0x82 nanoslp syz-executor 49586 494569 8565 0 3 0x82 nanoslp syz-executor 2033 156061 8565 0 3 0x82 nanoslp syz-executor 63323 71260 8565 0 3 0x82 nanoslp syz-executor 8565 354641 55096 0 3 0x82 kqread syz-executor 55096 190009 60836 0 3 0x10008a sigsusp ksh 60836 515774 63568 0 3 0x98 kqread sshd-session 63568 265064 37255 0 3 0x92 kqread sshd-session 37255 496092 1 0 3 0x88 kqread sshd 80740 3934 77482 74 3 0x1100092 bpf pflogd 77482 114600 1 0 3 0x80 sbwait pflogd 67792 461046 99810 73 3 0x1100090 kqread syslogd 99810 454510 1 0 3 0x100082 sbwait syslogd 19204 10459 1 0 3 0x100080 kqread resolvd 91928 491252 55372 77 3 0x100092 kqread dhcpleased 13542 31857 55372 77 3 0x100092 kqread dhcpleased 55372 188895 1 0 3 0x80 kqread dhcpleased 47489 212859 0 0 3 0x14200 bored smr 73991 306600 0 0 3 0x14200 pgzero zerothread 95867 33542 0 0 3 0x14200 aiodoned aiodoned 68752 198266 0 0 3 0x14200 syncer update 8745 114401 0 0 3 0x14200 cleaner cleaner 63816 308285 0 0 3 0x14200 reaper reaper 5157 504916 0 0 3 0x14200 pgdaemon pagedaemon 846 241787 0 0 3 0x14200 bored viomb 19574 149508 0 0 3 0x40014200 acpi0 acpi0 40404 34391 0 0 7 0x40014200 idle1 80864 28837 0 0 3 0x14200 bored softnet3 72648 20305 0 0 3 0x14200 bored softnet2 74592 69370 0 0 3 0x14200 bored softnet1 3053 262258 0 0 3 0x14200 bored softnet0 25616 101034 0 0 3 0x14200 bored systqmp 57997 141464 0 0 3 0x14200 bored systq 39070 152913 0 0 3 0x14200 tmoslp softclockmp 30270 518769 0 0 3 0x40014200 tmoslp softclock 22698 382415 0 0 3 0x40014200 idle0 1 455386 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 38964 (syz-executor) thread 0xffff8000ffff67c0 (193928) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8360db10) #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 (0xffff800001291200) #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:537 #3 sosend+0x2e2 sys/kern/uipc_socket.c:625 #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 Process 7546 (syz-executor) thread 0xffff80003c5b9990 (256157) exclusive rwlock sbufrcv r = 0 (0xffff800001290bc0) #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:537 #3 soreceive+0x28e sys/kern/uipc_socket.c:876 #4 recvit+0x40a sys/kern/uipc_syscalls.c:1072 #5 sys_recvmmsg+0x3d3 sys/kern/uipc_syscalls.c:963 #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10223 11042K 11848K 166960K 12570 0 pcb 17 14K 15K 166960K 167 0 rtable 191 5K 7K 166960K 560 0 pf 34 17K 22K 166960K 99 0 ifaddr 36 6K 8K 166960K 71 0 ifgroup 51 2K 2K 166960K 102 0 sysctl 4 1K 1K 166960K 4 0 counters 62 36K 36K 166960K 92 0 ioctlops 0 0K 4K 166960K 1555 0 iov 1 4K 28K 166960K 55 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1426 90K 90K 166960K 2185 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 36 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 1019 0 sigio 1 0K 0K 166960K 31 0 proc 72 91K 140K 166960K 672 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 259 0 in_multi 80 6K 7K 166960K 168 0 ether_multi 1 0K 0K 166960K 7 0 mrt 0 0K 0K 166960K 4 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 555 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 73K 77K 166960K 11250 0 UVM aobj 19 6K 6K 166960K 19 0 pinsyscall 43 86K 102K 166960K 2185 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 51 0 NDP 11 0K 2K 166960K 51 0 temp 60 6895K 6962K 166960K 50965 0 kqueue 13 20K 32K 166960K 197 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 95 0 92 1 0 1 1 0 8 0 rtentry 112 162 0 75 4 0 4 4 0 8 0 unpcb 144 625 0 598 5 3 2 4 0 8 1 syncache 336 13 0 13 3 3 0 1 0 8 0 tcpcb 808 276 0 269 9 3 6 8 0 8 5 arp 120 28 0 13 1 0 1 1 0 8 0 inpcb 376 1121 0 1108 10 2 8 8 0 8 6 nd6 136 38 0 15 1 0 1 1 0 8 0 pkpcb 40 15 0 15 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 7 0 7 2 2 0 1 0 8 0 pfstscr 40 2 0 2 2 2 0 1 0 8 0 pffrag 232 8 0 2 1 0 1 1 0 482 0 pffrnode 88 8 0 2 1 0 1 1 0 8 0 pffrent 40 11 0 5 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 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 113 0 29 1 0 1 1 0 8 0 pfstkey 128 115 0 31 4 0 4 4 0 8 0 pfstate 376 115 0 31 10 0 10 10 0 8 0 pfrule 1344 33 0 26 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 623 0 247 30 3 27 30 0 8 0 art_table 32 625 0 247 4 0 4 4 0 8 0 art_node 16 160 0 84 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 6 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 30 0 20 1 0 1 1 0 8 0 shmpl 112 16 0 0 1 0 1 1 0 8 0 dirhash 1024 30 0 13 3 0 3 3 0 8 0 dino2pl 256 3289 0 1787 95 0 95 95 0 8 0 ffsino 280 3289 0 1787 109 0 109 109 0 8 0 nchpl 144 4713 0 3028 63 0 63 63 0 8 0 uvmvnodes 80 3817 0 0 78 0 78 78 0 8 0 vnodes 216 3817 0 0 213 0 213 213 0 8 0 namei 1024 16362 0 16361 3 2 1 2 0 8 0 percpumem 16 60 0 15 1 0 1 1 0 8 0 kstatmem 264 52 0 30 2 0 2 2 0 8 0 scsiplug 72 8 0 8 3 3 0 1 0 8 0 scxspl 216 14005 0 14005 10 8 2 8 1 8 2 plimitpl 152 201 0 184 1 0 1 1 0 8 0 sigapl 424 1351 0 1280 10 1 9 9 0 8 0 futexpl 64 15248 0 15237 1 0 1 1 0 8 0 knotepl 120 342 0 0 11 0 11 11 0 8 0 kqueuepl 216 308 0 299 3 2 1 3 0 8 0 pipepl 328 188 0 160 3 0 3 3 0 8 0 fdescpl 504 1310 0 1278 5 0 5 5 0 8 0 filepl 152 8171 0 7933 18 6 12 15 0 8 2 lockfpl 104 424 0 419 1 0 1 1 0 8 0 lockfspl 48 135 0 131 1 0 1 1 0 8 0 sessionpl 144 36 0 27 1 0 1 1 0 8 0 pgrppl 48 59 0 42 1 0 1 1 0 8 0 ucredpl 104 1492 0 1478 1 0 1 1 0 8 0 zombiepl 144 1280 0 1280 1 0 1 1 0 8 1 processpl 1168 1351 0 1280 6 0 6 6 0 8 0 procpl 648 2836 0 2753 9 1 8 8 0 8 0 srpgc 96 4 0 4 3 2 1 1 0 8 1 sosppl 168 10 0 10 2 2 0 1 0 8 0 sockpl 688 1865 0 1822 14 5 9 11 0 8 5 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 25 0 0 1 0 1 1 0 8 0 mbufpl 256 302 0 0 19 0 19 19 0 8 0 bufpl 280 4526 0 138 314 0 314 314 0 8 0 anonpl 24 226578 0 217850 97 20 77 77 0 185 0 amapchunkpl 152 35732 0 35102 31 5 26 26 0 158 1 amappl16 200 5588 0 5313 50 24 26 26 0 8 0 amappl15 192 6 0 6 2 2 0 1 0 8 0 amappl14 184 135 0 123 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 1976 0 1944 4 1 3 3 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 25 0 22 1 0 1 1 0 8 0 amappl7 128 124 0 111 1 0 1 1 0 8 0 amappl6 120 198 0 195 1 0 1 1 0 8 0 amappl5 112 146 0 134 1 0 1 1 0 8 0 amappl4 104 378 0 358 1 0 1 1 0 8 0 amappl3 96 7231 0 7105 4 0 4 4 0 8 0 amappl2 88 753 0 690 2 0 2 2 0 8 0 amappl1 80 13106 0 12529 16 1 15 15 0 8 1 amappl 88 10729 0 10537 5 0 5 5 0 92 0 dma32768 32768 2 0 2 2 1 1 1 0 8 1 dma8192 8192 1 0 1 1 1 0 1 0 8 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 128 254 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 18 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1310 0 1278 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1310 0 1278 1 0 1 1 0 8 0 vmmpekpl 168 12926 0 12883 3 0 3 3 0 8 0 vmmpepl 168 89669 0 87486 112 7 105 105 0 357 2 vmsppl 456 1309 0 1278 6 1 5 5 0 8 0 rwobjpl 64 31670 0 26625 84 2 82 82 0 8 0 pdppl 4096 2627 0 2556 109 38 71 85 0 8 0 pvpl 32 19646 0 0 160 1 159 159 0 265 0 pmappl 248 1309 0 1278 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 313 0 55 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd805f9ceed8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd805f9ceec0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd805f9ceec0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8075bb5bf0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8075bb5bf0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff800034563eb8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800034563eb8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800001291040,fffffd8062454400,ffff8000ffff67c0) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800001291040,fffffd80623fff00,fffffd8062454400,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800001291040,fffffd8062454400,ffff800034564138,0,0,0) at sosend+0x804 sendit(ffff8000ffff67c0,3,ffff8000345642b0,0,ffff800034564370) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff8000ffff67c0,ffff800034564420,ffff800034564370) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff800034564420) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034564420) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4abd96ed120, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b5bff0) 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 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029b5bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5