witness: lock order reversal:
1st 0xffff800001188c18 sbufsnd (&so->so_snd.sb_lock)
2nd 0xfffffd8074aa02c0 inode (&ip->i_lock)
lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock)
lock order data 0xffffffff830b2c8d -> 0xffffffff8305f254 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:947
#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+0x3f4 sys/kern/uipc_socket.c:1456
#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{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(fffffd8074aa02c0,9,0) at witness_checkorder+0x1024
rw_enter(fffffd8074aa02b0,1) at rw_enter+0x122
rrw_enter(fffffd8074aa02b0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464
VOP_LOCK(fffffd806566b2b0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524
vn_lock(fffffd806566b2b0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564
vfs_lookup(ffff8000371fd3b8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418
namei(ffff8000371fd3b8) at namei+0x7aa sys/kern/vfs_lookup.c:250
unp_connect(ffff800001188a70,fffffd806c823100,ffff80003499c028) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868
uipc_dgram_send(ffff800001188a70,fffffd806ce64600,fffffd806c823100,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607
sosend(ffff800001188a70,fffffd806c823100,ffff8000371fd648,0,0,0) at sosend+0xa40
sendit(ffff80003499c028,3,ffff8000371fd7c0,0,ffff8000371fd880) at sendit+0x721 sys/kern/uipc_syscalls.c:786
sys_sendmsg(ffff80003499c028,ffff8000371fd930,ffff8000371fd880) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604
syscall(ffff8000371fd930) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff8000371fd930) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfdc32fe1780, count: -15
ddb{0}> show registers
rdi 0
rsi 0x40000 acpi_pdirpa+0x2be71
rbp 0xffff8000371fd010
rbx 0xffffffff8306f162 pp_r600_decoded_lanes+0x31454
rdx 0xffff8000012108c0
rcx 0xffff80003499c028
rax 0x3ffff acpi_pdirpa+0x2be70
r8 0xffff8000371fcef0
r9 0x8080808080808080
r10 0x11f3d58fb962ebf9
r11 0xc2a520fa9347ab55
r12 0xfffffd80042b5350
r13 0xfffffd8003acce00
r14 0x3
r15 0xffffffff
rip 0xffffffff812a47a5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff8000371fd000
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=411307 pid=91383 tcnt=2 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003499c7c0,0xffffffff836140d8
process=0xffff8000ffffb670 user=0xffff8000371f8000, vmspace=0xfffffd800934a530
estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
91383 145601 70802 0 2 0 syz-executor
*91383 411307 70802 0 7 0x4000000 syz-executor
39544 177009 11372 0 2 0 syz-executor
39544 177705 11372 0 3 0x4000080 fsleep syz-executor
60699 145001 30691 0 2 0 syz-executor
60699 460462 30691 0 3 0x4000080 fsleep syz-executor
43137 322327 99419 0 2 0x10 syz-executor
43137 478730 99419 0 3 0x4000090 fsleep syz-executor
52846 224878 24224 0 2 0 syz-executor
52846 197049 24224 0 3 0x4000080 kqread syz-executor
52846 466162 24224 0 2 0x4000000 syz-executor
45350 403255 22394 0 2 0x82000 syz-executor
45350 290493 22394 0 4 0x4082000 syz-executor
45350 143393 22394 0 3 0x4002000 suspend syz-executor
20593 62416 97997 0 2 0 syz-executor
20593 132380 97997 0 2 0x4000000 syz-executor
58675 214696 93608 0 3 0x4000080 nanoslp syz-executor
58675 415839 93608 0 3 0x4000080 lockf syz-executor
58675 34721 93608 0 3 0x4000080 fsleep syz-executor
99419 184466 10507 0 3 0x82 nanoslp syz-executor
22394 208445 10507 0 3 0x82 nanoslp syz-executor
30691 347491 10507 0 3 0x82 nanoslp syz-executor
24224 472918 10507 0 3 0x82 nanoslp syz-executor
93608 119669 10507 0 3 0x82 nanoslp syz-executor
70802 118232 10507 0 3 0x82 nanoslp syz-executor
11372 509888 10507 0 3 0x82 nanoslp syz-executor
97997 258027 10507 0 3 0x82 nanoslp syz-executor
78499 88515 0 0 3 0x14200 bored sosplice
10507 292773 6955 0 3 0x82 kqread syz-executor
6955 518954 49510 0 3 0x10008a sigsusp ksh
49510 841 31748 0 3 0x98 kqread sshd-session
31748 280682 82157 0 3 0x92 kqread sshd-session
92477 199159 1 0 3 0x100083 ttyin getty
82157 114629 1 0 3 0x88 kqread sshd
49764 42859 97454 74 3 0x1100092 bpf pflogd
97454 28385 1 0 3 0x80 sbwait pflogd
32750 94092 85445 73 3 0x1100010 ffs_fsync syslogd
85445 77296 1 0 3 0x100082 sbwait syslogd
38746 143636 1 0 3 0x100080 kqread resolvd
13867 117465 86999 77 3 0x100092 kqread dhcpleased
65533 454290 86999 77 3 0x100092 kqread dhcpleased
86999 36131 1 0 3 0x80 kqread dhcpleased
8225 481807 0 0 3 0x14200 bored smr
37884 515171 0 0 2 0x14200 zerothread
14051 27187 0 0 3 0x14200 aiodoned aiodoned
22680 274047 0 0 3 0x14200 syncer update
63344 115742 0 0 3 0x14200 cleaner cleaner
6262 220816 0 0 3 0x14200 reaper reaper
15274 417477 0 0 3 0x14200 pgdaemon pagedaemon
81866 406348 0 0 3 0x14200 bored viomb
95161 171095 0 0 3 0x40014200 acpi0 acpi0
57669 5268 0 0 7 0x40014200 idle1
84718 47257 0 0 3 0x14200 bored softnet3
88293 251295 0 0 3 0x14200 bored softnet2
73726 9787 0 0 3 0x14200 bored softnet1
83672 138018 0 0 3 0x14200 bored softnet0
30 101863 0 0 3 0x14200 bored systqmp
44767 462914 0 0 3 0x14200 bored systq
16295 116538 0 0 3 0x14200 tmoslp softclockmp
14568 72669 0 0 3 0x40014200 tmoslp softclock
90225 415880 0 0 3 0x40014200 idle0
1 51966 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 91383 (syz-executor) thread 0xffff80003499c028 (411307)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835dd500)
#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: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:179 [inline]
#6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577
#7 Xsyscall+0x128
exclusive rwlock sbufsnd r = 0 (0xffff800001188c18)
#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: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:179 [inline]
#6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577
#7 Xsyscall+0x128
Process 32750 (syslogd) thread 0xffff8000ffffd1c8 (94092)
exclusive rrwlock inode r = 0 (0xfffffd806e4ae4e0)
#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:2926
#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{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10231 10113K 10499K 166960K 12753 0
pcb 18 16K 18K 166960K 405 0
rtable 214 11K 12K 166960K 2091 0
pf 40 18K 22K 166960K 197 0
ifaddr 38 7K 8K 166960K 264 0
ifgroup 60 2K 2K 166960K 292 0
sysctl 4 1K 1K 166960K 4 0
counters 66 36K 37K 166960K 188 0
ioctlops 0 0K 4K 166960K 1745 0
iov 0 0K 16K 166960K 69 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1481 93K 94K 166960K 3004 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 16 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 98 0
dirhash 12 2K 2K 166960K 30 0
ACPI 1690 195K 286K 166960K 12418 0
file desc 18 65K 97K 166960K 1936 0
sigio 0 0K 0K 166960K 25 0
proc 70 91K 140K 166960K 1984 0
subproc 104 6K 6K 166960K 742 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 173 0
in_multi 82 6K 7K 166960K 683 0
ether_multi 1 0K 0K 166960K 6 0
mrt 1 0K 0K 166960K 5 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 223 996K 996K 166960K 223 0
exec 0 0K 1K 166960K 1164 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 251 91K 91K 166960K 16595 0
UVM aobj 37 3K 4K 166960K 41 0
pinsyscall 43 86K 106K 166960K 4299 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 2 0K 1K 166960K 62 0
NDP 13 0K 1K 166960K 191 0
temp 77 6824K 6931K 166960K 58592 0
kqueue 14 22K 30K 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 120 322 0 319 4 3 1 3 0 8 0
rtentry 112 714 0 623 4 0 4 4 0 8 0
unpcb 144 855 0 837 7 5 2 2 0 8 1
syncache 336 9 0 9 4 4 0 1 0 8 0
tcpqe 32 2 0 2 1 1 0 1 0 8 0
tcpcb 808 435 0 429 14 12 2 5 0 8 0
arp 120 131 0 117 1 0 1 1 0 8 0
inpcb 336 2129 0 2113 31 28 3 10 0 8 1
nd6 136 189 0 169 1 0 1 1 0 8 0
pkpcb 40 10 0 10 5 5 0 1 0 8 0
kcovpl 48 57 0 49 1 0 1 1 0 8 0
ppxss 1168 7 0 7 3 3 0 1 0 8 0
pfstscr 40 3 0 3 2 2 0 1 0 8 0
pffrag 232 14 0 10 1 0 1 1 0 482 0
pffrnode 88 14 0 10 1 0 1 1 0 8 0
pffrent 40 65 0 61 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 11 0 7 1 0 1 1 0 8 0
pfanchor 1288 2 0 1 1 0 1 1 0 8 0
pftag 88 2 0 2 1 1 0 1 0 8 0
pfstitem 24 177 0 121 1 0 1 1 0 8 0
pfstkey 128 181 0 125 3 0 3 3 0 8 0
pfstate 376 179 0 123 7 0 7 7 0 8 0
pfrule 1344 30 0 23 2 1 1 2 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 2778 0 2367 34 5 29 31 0 8 1
art_table 32 2780 0 2367 4 0 4 4 0 8 0
art_node 16 710 0 628 1 0 1 1 0 8 0
sysvmsgpl 40 20 0 15 4 3 1 1 0 8 0
semapl 112 96 0 86 1 0 1 1 0 8 0
shmpl 112 38 0 4 1 0 1 1 0 8 0
dirhash 1024 29 0 12 3 0 3 3 0 8 0
dino2pl 256 3611 0 2018 101 0 101 101 0 8 0
ffsino 272 3611 0 2018 107 0 107 107 0 8 0
nchpl 144 5461 0 4845 65 39 26 65 0 8 0
uvmvnodes 80 5016 0 0 103 0 103 103 0 8 0
vnodes 216 5016 0 0 279 0 279 279 0 8 0
namei 1024 23487 0 23486 5 4 1 2 0 8 0
percpumem 16 108 0 61 1 0 1 1 0 8 0
pfiaddrpl 120 3 0 1 1 0 1 1 0 8 0
kstatmem 264 148 0 122 3 1 2 3 0 8 0
acpiwqpl 32 2 0 2 1 0 1 1 1 8 1
scsiplug 72 2 0 2 2 2 0 1 0 8 0
scxspl 216 37884 0 37883 14 13 1 8 1 8 0
plimitpl 152 288 0 269 1 0 1 1 0 8 0
sigapl 424 2142 0 2091 10 3 7 7 0 8 0
futexpl 64 17600 0 17596 5 4 1 1 0 8 0
knotepl 120 392 0 0 10 0 10 10 0 8 0
kqueuepl 216 419 0 408 7 6 1 5 0 8 0
pipepl 320 358 0 331 3 0 3 3 0 8 0
fdescpl 496 2122 0 2090 10 5 5 6 0 8 0
filepl 152 11798 0 11539 40 26 14 18 0 8 4
lockfpl 104 576 0 570 1 0 1 1 0 8 0
lockfspl 48 211 0 206 1 0 1 1 0 8 0
sessionpl 144 75 0 66 1 0 1 1 0 8 0
pgrppl 48 151 0 134 1 0 1 1 0 8 0
ucredpl 104 1481 0 1467 1 0 1 1 0 8 0
zombiepl 144 2091 0 2091 1 0 1 1 0 8 1
processpl 1160 2142 0 2091 5 1 4 5 0 8 0
procpl 648 3940 0 3878 9 3 6 7 0 8 0
srpgc 96 10 0 10 4 3 1 1 0 8 1
sosppl 168 4 0 4 4 3 1 1 0 8 1
sockpl 664 3335 0 3298 43 38 5 15 0 8 0
mcl64k 65536 2 0 0 1 0 1 1 0 8 0
mcl16k 16384 4 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 5 0 0 1 0 1 1 0 8 0
mcl4k 4096 5 0 0 1 0 1 1 0 8 0
mcl2k2 2112 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 248 0 0 31 1 30 31 0 8 0
mtagpl 96 19 0 0 1 0 1 1 0 8 0
mbufpl 256 572 0 0 33 0 33 33 0 8 0
bufpl 280 10037 0 3228 487 0 487 487 0 8 0
anonpl 24 330540 0 322134 65 14 51 57 0 185 0
amapchunkpl 152 52970 0 52151 44 12 32 34 0 158 0
amappl16 200 6217 0 6192 50 36 14 15 0 8 11
amappl15 192 13 0 13 1 1 0 1 0 8 0
amappl14 184 219 0 207 1 0 1 1 0 8 0
amappl13 176 8 0 8 1 1 0 1 0 8 0
amappl12 168 3544 0 3511 4 2 2 3 0 8 0
amappl11 160 58 0 44 1 0 1 1 0 8 0
amappl10 152 10 0 9 2 1 1 1 0 8 0
amappl9 144 159 0 159 2 2 0 1 0 8 0
amappl8 136 20 0 18 1 0 1 1 0 8 0
amappl7 128 251 0 239 1 0 1 1 0 8 0
amappl6 120 727 0 726 1 0 1 1 0 8 0
amappl5 112 331 0 319 1 0 1 1 0 8 0
amappl4 104 501 0 480 1 0 1 1 0 8 0
amappl3 96 9471 0 9355 4 1 3 4 0 8 0
amappl2 88 2473 0 2393 2 0 2 2 0 8 0
amappl1 80 17083 0 16494 15 0 15 15 0 8 0
amappl 88 15758 0 15570 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 128 254 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 19 0 18 1 0 1 1 0 8 0
aobjpl 72 40 0 4 1 0 1 1 0 8 0
uaddrrnd 24 2122 0 2090 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2122 0 2090 1 0 1 1 0 8 0
vmmpekpl 168 18415 0 18374 4 1 3 3 0 8 0
vmmpepl 168 135950 0 133999 124 28 96 96 0 357 9
vmsppl 440 2121 0 2090 6 2 4 5 0 8 0
rwobjpl 56 44089 0 38071 92 4 88 88 0 8 2
pdppl 4096 4251 0 4180 176 103 73 87 0 8 2
pvpl 32 29557 0 0 238 0 238 238 0 265 0
pmappl 248 2121 0 2090 3 0 3 3 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 551 0 162 12 0 12 12 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(fffffd8074aa02c0,9,0) at witness_checkorder+0x1024
rw_enter(fffffd8074aa02b0,1) at rw_enter+0x122
rrw_enter(fffffd8074aa02b0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464
VOP_LOCK(fffffd806566b2b0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524
vn_lock(fffffd806566b2b0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564
vfs_lookup(ffff8000371fd3b8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418
namei(ffff8000371fd3b8) at namei+0x7aa sys/kern/vfs_lookup.c:250
unp_connect(ffff800001188a70,fffffd806c823100,ffff80003499c028) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868
uipc_dgram_send(ffff800001188a70,fffffd806ce64600,fffffd806c823100,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607
sosend(ffff800001188a70,fffffd806c823100,ffff8000371fd648,0,0,0) at sosend+0xa40
sendit(ffff80003499c028,3,ffff8000371fd7c0,0,ffff8000371fd880) at sendit+0x721 sys/kern/uipc_syscalls.c:786
sys_sendmsg(ffff80003499c028,ffff8000371fd930,ffff8000371fd880) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604
syscall(ffff8000371fd930) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff8000371fd930) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfdc32fe1780, count: -15
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
ddb{1}> trace
x86_ipi_db(ffff800029b7bff0) 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:1219
sched_idle(ffff800029b7bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182
end trace frame: 0x0, count: -5