login: witness: lock order reversal:
1st 0xffff800001694108 sbufrcv (&so->so_rcv.sb_lock)
2nd 0xfffffd806f08aa50 inode (&ip->i_lock)
lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock)
lock order data 0xffffffff83339003 -> 0xffffffff8338b2bb is missing
lock order [2] inode (&ip->i_lock) -> [1] 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:878
#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:685
#7 vndioctl+0xdfc sys/dev/vnd.c:486
#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:775
#12 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:438
witness_checkorder(fffffd806f08aa50,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806f08aa38,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffffd806f08aa38,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd800d4e1b10,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd800d4e1b10,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_getcwd_common(fffffd800d4e1b10,fffffd80756a3a50,0,0,200,0,57a86c032228360b) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287
vn_isunder(fffffd800d4e1b10,fffffd80756a3a50,ffff80003c4aa2e0) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694
unp_externalize(fffffd800cf87400,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090
soreceive(ffff800001694018,ffff80003e8f53c8,ffff80003e8f5378,0,ffff80003e8f53b0,ffff80003e8f553c,394227d7dfec1a6c) at soreceive+0xc24 sys/kern/uipc_socket.c:1017
recvit(ffff80003c4aa2e0,8,ffff80003e8f5510,0,ffff80003e8f55c0) at recvit+0x40b sys/kern/uipc_syscalls.c:1078
sys_recvmsg(ffff80003c4aa2e0,ffff80003e8f5670,ffff80003e8f55c0) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878
syscall(ffff80003e8f5670) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003e8f5670) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6c25ad963b0, count: -14
ddb{0}> show registers
rdi 0
rsi 0x80000 acpi_pdirpa+0x6be71
rbp 0xffff80003e8f4e50
rbx 0
rdx 0xffff80000158fc40
rcx 0xffff80003c4aa2e0
rax 0x7ffff acpi_pdirpa+0x6be70
r8 0xffff80003e8f4d30
r9 0x8080808080808080
r10 0x99a3b0dc1a8f4501
r11 0xfb603177600da55f
r12 0xfffffd8003f4e880
r13 0xfffffd8004737890
r14 0x3
r15 0xffffffff8341e509 substchar+0x900e
rip 0xffffffff8266fea5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80003e8f4e40
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=61058 pid=45832 tcnt=2 stat=onproc
flags process=1000000<CHROOT> proc=4000000<THREAD>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003c4aad40,0xffffffff83a0e5c0
process=0xffff8000fffe49c0 user=0xffff80003e8f0000, vmspace=0xfffffd800b0633d0
estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
45832 272575 92471 0 2 0x1000000 syz-executor
*45832 61058 92471 0 7 0x5000000 syz-executor
95891 132830 13272 0 3 0x80 nanoslp syz-executor
95891 74971 13272 0 3 0x4000080 netcon syz-executor
95891 466247 13272 0 3 0x4000080 fsleep syz-executor
42894 244601 7694 0 2 0 syz-executor
42894 74054 7694 0 3 0x4000080 fsleep syz-executor
65488 21060 35079 0 2 0 syz-executor
65488 513083 35079 0 2 0x4000000 syz-executor
80432 317794 38066 0 2 0 syz-executor
80432 119919 38066 0 3 0x4000080 fsleep syz-executor
2300 269949 76845 0 3 0x80 nanoslp syz-executor
2300 216048 76845 0 3 0x4000080 kqsel syz-executor
2300 5111 76845 0 3 0x4000080 fsleep syz-executor
47837 125082 56727 0 3 0x3000 suspend syz-executor
47837 332434 56727 0 3 0x4081000 biowait syz-executor
47837 288774 56727 0 3 0x4081000 fltagain2 syz-executor
63572 306264 1727 0 3 0x80 nanoslp syz-executor
63572 221757 1727 0 3 0x4000080 kqread syz-executor
63572 247266 1727 0 3 0x4000080 fsleep syz-executor
63572 317749 1727 0 3 0x4000080 fsleep syz-executor
15278 380995 0 0 3 0x14280 nfsidl nfsio
94713 226574 0 0 3 0x14280 nfsidl nfsio
28577 464196 0 0 3 0x14280 nfsidl nfsio
80902 511161 0 0 3 0x14280 nfsidl nfsio
74829 400469 0 0 3 0x14280 nfsidl nfsio
99033 671 0 0 3 0x14280 nfsidl nfsio
50950 470754 0 0 3 0x14280 nfsidl nfsio
62032 17565 0 0 3 0x14280 nfsidl nfsio
30872 112353 0 0 3 0x14280 nfsidl nfsio
56326 488160 0 0 3 0x14280 nfsidl nfsio
7335 147029 0 0 3 0x14280 nfsidl nfsio
98793 176680 0 0 3 0x14280 nfsidl nfsio
51496 121751 0 0 3 0x14280 nfsidl nfsio
86305 87748 0 0 3 0x14280 nfsidl nfsio
66044 343147 0 0 3 0x14280 nfsidl nfsio
31561 212859 0 0 3 0x14280 nfsidl nfsio
72980 238494 0 0 3 0x14280 nfsidl nfsio
94609 279010 0 0 3 0x14280 nfsidl nfsio
78201 206596 0 0 3 0x14280 nfsidl nfsio
1388 301715 0 0 3 0x14280 nfsidl nfsio
89387 460920 0 0 3 0x14200 acct acct
19045 314942 1 0 3 0x100083 ttyopn getty
76845 400274 91408 0 3 0x82 nanoslp syz-executor
56727 121919 91408 0 3 0x82 nanoslp syz-executor
92471 4922 91408 0 3 0x82 nanoslp syz-executor
35079 226483 91408 0 3 0x82 nanoslp syz-executor
1727 219020 91408 0 2 0x2 syz-executor
13272 273818 91408 0 3 0x82 nanoslp syz-executor
38066 369475 91408 0 3 0x82 nanoslp syz-executor
7694 9515 91408 0 3 0x82 nanoslp syz-executor
38030 146997 85763 0 3 0x100082 sbwait arp
85763 358179 1 0 3 0x10008a sigsusp sh
91408 60775 36958 0 2 0x2 syz-executor
36958 67626 98248 0 3 0x10008a sigsusp ksh
98248 302428 63549 0 3 0x98 kqread sshd-session
63549 372388 54115 0 3 0x92 kqread sshd-session
54115 454710 1 0 3 0x88 kqread sshd
88653 437829 87635 74 3 0x1100092 bpf pflogd
87635 307245 1 0 3 0x80 sbwait pflogd
43840 415387 2118 73 3 0x1100090 kqread syslogd
2118 122852 1 0 3 0x100082 sbwait syslogd
17750 354984 1 0 3 0x100080 kqread resolvd
54636 439707 51401 77 3 0x100092 kqread dhcpleased
47254 146583 51401 77 3 0x100092 kqread dhcpleased
51401 248521 1 0 3 0x80 kqread dhcpleased
94121 293869 0 0 3 0x14200 bored smr
85661 211542 0 0 2 0x14200 zerothread
82990 36897 0 0 3 0x14200 aiodoned aiodoned
78326 461781 0 0 3 0x14200 syncer update
21332 145853 0 0 3 0x14200 cleaner cleaner
65627 160063 0 0 3 0x14200 reaper reaper
354 449396 0 0 3 0x14200 pgdaemon pagedaemon
23356 378190 0 0 3 0x14200 bored viomb
36293 61620 0 0 3 0x40014200 acpi0 acpi0
29326 511422 0 0 7 0x40014200 idle1
27229 388883 0 0 3 0x14200 bored softnet1
17443 512632 0 0 3 0x14200 bored softnet0
26080 137030 0 0 3 0x14200 bored systqmp
41209 128897 0 0 3 0x14200 bored systq
22641 362870 0 0 3 0x14200 tmoslp softclockmp
39529 127258 0 0 3 0x40014200 tmoslp softclock
86923 512070 0 0 3 0x40014200 idle0
1 505980 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{0}> show all locks
Process 45832 (syz-executor) thread 0xffff80003c4aa2e0 (61058)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83973148)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 unp_externalize+0x155 sys/kern/uipc_usrreq.c:-1
#2 soreceive+0xc24 sys/kern/uipc_socket.c:1017
#3 recvit+0x40b sys/kern/uipc_syscalls.c:1078
#4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#6 Xsyscall+0x128
exclusive rwlock sbufrcv r = 0 (0xffff800001694108)
#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 soreceive+0x27d sys/kern/uipc_socket.c:878
#4 recvit+0x40b sys/kern/uipc_syscalls.c:1078
#5 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878
#6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#7 Xsyscall+0x128
Process 47837 (syz-executor) thread 0xffff80002a28ca90 (332434)
exclusive rrwlock inode r = 0 (0xfffffd8072eb8588)
#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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vn_write+0x18f sys/kern/vfs_vnops.c:405
#6 dofilewritev+0x242 sys/kern/sys_generic.c:380
#7 sys_write+0xa2 sys/kern/sys_generic.c:300
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11097 12108K 12297K 166960K 14179 0
pcb 18 16K 32K 166960K 794 0
rtable 246 15K 16K 166960K 933 0
pf 35 17K 82K 166960K 232 0
ifaddr 42 8K 8K 166960K 197 0
ifgroup 58 2K 3K 166960K 328 0
sysctl 4 1K 9K 166960K 37 0
counters 70 37K 39K 166960K 332 0
ioctlops 0 0K 4K 166960K 2034 0
iov 0 0K 28K 166960K 141 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1462 92K 93K 166960K 3426 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 43 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 212 0
dirhash 12 2K 3K 166960K 51 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 20 73K 248K 166960K 2648 0
sigio 0 0K 0K 166960K 46 0
proc 73 115K 164K 166960K 1058 0
subproc 81 5K 5K 166960K 153 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 335 0
in_multi 87 6K 6K 166960K 330 0
ether_multi 1 0K 0K 166960K 28 0
mrt 1 0K 0K 166960K 19 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 977 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 4K 166960K 5 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 268 176K 184K 166960K 25760 0
UVM aobj 122 20K 20K 166960K 165 0
pinsyscall 46 92K 101K 166960K 3992 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 205 0
NDP 12 0K 1K 166960K 131 0
temp 78 8684K 8806K 166960K 135629 0
kqueue 15 24K 32K 166960K 507 0
SYN cache 2 8K 16K 166960K 3 0
ddb{0}> 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 120 375 0 371 4 3 1 3 0 8 0
rtentry 176 287 0 193 5 0 5 5 0 8 0
unpcb 144 2042 0 2021 18 16 2 11 0 8 1
syncache 336 16 0 16 4 3 1 1 0 8 1
tcpqe 32 3 0 3 1 1 0 1 0 8 0
tcpcb 736 877 0 869 11 9 2 7 0 8 1
arp 136 43 0 27 1 0 1 1 0 8 0
inpcb 328 3662 0 3582 33 23 10 13 0 8 3
nd6 152 54 0 31 1 0 1 1 0 8 0
pkpcb 40 22 0 22 4 3 1 1 0 8 1
kcovpl 48 17 0 8 1 0 1 1 0 8 0
mppekey 1024 2 0 2 2 2 0 1 0 8 0
ppxss 1192 92 0 92 4 3 1 1 0 8 1
pppxif 1504 12 0 12 4 4 0 1 0 8 0
pffrag 232 17 0 5 1 0 1 1 0 482 0
pffrnode 88 17 0 5 1 0 1 1 0 8 0
pffrent 40 26 0 13 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
pfrktable 1344 1 0 1 1 1 0 1 0 8 0
rttmr 136 5 0 5 3 2 1 1 0 8 1
art_heap8 4096 4 0 0 4 0 4 4 0 8 0
art_heap4 256 1315 0 909 36 10 26 28 0 8 0
art_table 40 1319 0 909 5 0 5 5 0 8 0
art_node 32 284 0 202 1 0 1 1 0 8 0
sysvmsgpl 40 24 0 16 1 0 1 1 0 8 0
semupl 112 2 0 2 2 1 1 1 0 8 1
semapl 112 210 0 200 1 0 1 1 0 8 0
shmpl 112 123 0 9 4 0 4 4 0 8 0
dirhash 1024 43 0 26 3 0 3 3 0 8 0
dino2pl 256 6466 0 4940 96 0 96 96 0 8 0
ffsino 296 6466 0 4940 118 0 118 118 0 8 0
nchpl 144 10013 0 8291 64 0 64 64 0 8 0
rtmask 32 24 0 24 4 3 1 1 0 8 1
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 36516 0 36516 3 2 1 2 0 8 1
percpumem 16 181 0 131 1 0 1 1 0 8 0
vcpupl 3968 5 0 0 1 0 1 1 0 8 0
vmpool 848 38 0 33 2 1 1 1 0 8 0
kstatmem 264 196 0 168 5 2 3 3 0 8 1
scsiplug 72 10 0 10 6 6 0 1 0 8 0
scxspl 216 77707 0 77706 14 12 2 8 1 8 1
plimitpl 152 799 0 777 1 0 1 1 0 8 0
sigapl 424 2941 0 2870 8 0 8 8 0 8 0
knotepl 120 1088 0 0 32 0 32 32 0 8 0
kqueuepl 224 1033 0 1022 12 10 2 5 0 8 0
pipepl 344 559 0 528 6 2 4 6 0 8 1
fdescpl 528 2880 0 2846 3 0 3 3 0 8 0
filepl 160 21255 0 20942 36 20 16 25 0 8 1
lockfpl 104 1482 0 1479 3 2 1 2 0 8 0
lockfspl 48 498 0 495 1 0 1 1 0 8 0
sessionpl 144 41 0 32 1 0 1 1 0 8 0
pgrppl 48 88 0 70 1 0 1 1 0 8 0
ucredpl 104 3588 0 3574 1 0 1 1 0 8 0
zombiepl 144 3343 0 3342 1 0 1 1 0 8 0
processpl 1232 2941 0 2870 7 1 6 7 0 8 0
procpl 664 7118 0 7034 10 2 8 8 0 8 0
sosppl 176 24 0 24 4 3 1 1 0 8 1
sockpl 752 6236 0 6131 75 61 14 41 0 8 3
mcl64k 65536 10 0 0 2 0 2 2 0 8 0
mcl16k 16384 10 0 0 2 0 2 2 0 8 0
mcl12k 12288 5 0 0 1 0 1 1 0 8 0
mcl9k 9216 4 0 0 1 0 1 1 0 8 0
mcl8k 8192 7 0 0 1 0 1 1 0 8 0
mcl4k 4096 125 0 0 16 0 16 16 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 124 0 0 13 1 12 12 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 1174 0 0 72 0 72 72 0 8 0
bufpl 280 32242 0 26106 439 0 439 439 0 8 0
anonpl 32 11666 0 0 96 1 95 95 0 246 0
amapchunkpl 152 88911 0 88178 57 24 33 34 0 158 3
amappl16 200 12161 0 11966 83 61 22 28 0 8 8
amappl15 192 5 0 5 1 1 0 1 0 8 0
amappl14 184 12 0 12 2 2 0 1 0 8 0
amappl13 176 534 0 532 1 0 1 1 0 8 0
amappl12 168 3318 0 3272 3 0 3 3 0 8 0
amappl11 160 9 0 9 2 2 0 1 0 8 0
amappl10 152 46 0 32 1 0 1 1 0 8 0
amappl9 144 250 0 250 1 1 0 1 0 8 0
amappl8 136 48 0 46 1 0 1 1 0 8 0
amappl7 128 116 0 114 1 0 1 1 0 8 0
amappl6 120 397 0 381 1 0 1 1 0 8 0
amappl5 112 85 0 74 1 0 1 1 0 8 0
amappl4 104 508 0 474 1 0 1 1 0 8 0
amappl3 96 15515 0 15409 4 1 3 3 0 8 0
amappl2 88 3047 0 2967 2 0 2 2 0 8 0
amappl1 80 21748 0 21116 15 0 15 15 0 8 0
amappl 88 24432 0 24249 5 0 5 5 0 92 0
uvmvnodes 80 188 0 0 4 0 4 4 0 8 0
dma65536 65536 1 0 1 1 1 0 1 0 8 0
dma16384 16384 1 0 1 1 1 0 1 0 8 0
dma8192 8192 1 0 1 1 1 0 1 0 8 0
dma4096 4096 2 0 2 2 2 0 1 0 8 0
dma1024 1024 1 0 0 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 9 0 9 4 3 1 1 0 8 1
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 72 164 0 43 3 0 3 3 0 8 0
uaddrrnd 24 2880 0 2846 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2880 0 2846 1 0 1 1 0 8 0
vmmpekpl 168 25168 0 25120 3 0 3 3 0 8 0
vmmpepl 168 190599 0 188348 130 20 110 110 0 357 10
vmsppl 488 2879 0 2846 5 0 5 5 0 8 0
rwobjpl 80 52752 0 51282 38 2 36 36 0 8 0
pdppl 4096 5844 0 5763 120 39 81 84 0 8 0
pvpl 32 21104 0 0 170 0 170 170 0 265 0
pmappl 256 2917 0 2879 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 397 0 74 10 0 10 10 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:438
witness_checkorder(fffffd806f08aa50,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806f08aa38,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffffd806f08aa38,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd800d4e1b10,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd800d4e1b10,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_getcwd_common(fffffd800d4e1b10,fffffd80756a3a50,0,0,200,0,57a86c032228360b) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287
vn_isunder(fffffd800d4e1b10,fffffd80756a3a50,ffff80003c4aa2e0) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694
unp_externalize(fffffd800cf87400,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090
soreceive(ffff800001694018,ffff80003e8f53c8,ffff80003e8f5378,0,ffff80003e8f53b0,ffff80003e8f553c,394227d7dfec1a6c) at soreceive+0xc24 sys/kern/uipc_socket.c:1017
recvit(ffff80003c4aa2e0,8,ffff80003e8f5510,0,ffff80003e8f55c0) at recvit+0x40b sys/kern/uipc_syscalls.c:1078
sys_recvmsg(ffff80003c4aa2e0,ffff80003e8f5670,ffff80003e8f55c0) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878
syscall(ffff80003e8f5670) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003e8f5670) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6c25ad963b0, count: -14
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
ddb{1}> trace
x86_ipi_db(ffff8000299ddff0) 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
acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224
sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191
end trace frame: 0x0, count: -5