witness: lock order reversal:
1st 0xffff800010fddb80 sbufsnd (&so->so_snd.sb_lock)
2nd 0xfffffd806f5321e0 inode (&ip->i_lock)
lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock)
lock order data 0xffffffff8343210f -> 0xffffffff833d2795 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:232
#1 sblock+0xb7 sys/kern/uipc_socket2.c:536
#2 soreceive+0x28e sys/kern/uipc_socket.c:881
#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 sys/kern/vfs_vnops.c:-1
#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 sys/kern/sys_generic.c:-1
#11 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#11 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#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:232
#1 sblock+0xb7 sys/kern/uipc_socket2.c:536
#2 sosplice+0x40d sys/kern/uipc_socket.c:1366
#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:579
#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:438
witness_checkorder(fffffd806f5321e0,9,0) at witness_checkorder+0x10fb sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806f5321c8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:232
rrw_enter(fffffd806f5321c8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:605
VOP_LOCK(fffffd806d1b2878,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
vn_lock(fffffd806d1b2878,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_lookup(ffff800034fe9208) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418
namei(ffff800034fe9208) at namei+0x7aa sys/kern/vfs_lookup.c:250
unp_connect(ffff800010fdd9a8,fffffd806c30e800,ffff800037fee030) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868
uipc_dgram_send(ffff800010fdd9a8,fffffd806bfcaf00,fffffd806c30e800,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607
sosend(ffff800010fdd9a8,fffffd806c30e800,ffff800034fe9488,0,0,8) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff800037fee030,3,ffff800034fe9600,8,ffff800034fe96c0) at sendit+0x721 sys/kern/uipc_syscalls.c:779
sys_sendmsg(ffff800037fee030,ffff800034fe9770,ffff800034fe96c0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597
syscall(ffff800034fe9770) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800034fe9770) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5cd0b5903d0, count: -15
ddb{0}> show registers
rdi 0
rsi 0x80000 acpi_pdirpa+0x6be71
rbp 0xffff800034fe8e80
rbx 0xfffffd8004744938
rdx 0xffff800001458f40
rcx 0xffff800037fee030
rax 0x7ffff acpi_pdirpa+0x6be70
r8 0xffff800034fe8d60
r9 0x8080808080808080
r10 0xb5e4982ceda4abb7
r11 0x783b234b907aa35b
r12 0
r13 0xfffffd8003f5cf00
r14 0x3
r15 0xffffffff
rip 0xffffffff82a95135 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff800034fe8e70
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=342634 pid=6452 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=0xffff800037fee7e0,0xffff800037fee560
process=0xffff80003c4aa210 user=0xffff800034fe4000, vmspace=0xfffffd806c004b60
estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
18824 132794 20275 0 2 0 syz-executor
18824 467687 20275 0 3 0x4000080 fsleep syz-executor
6452 46652 81452 0 2 0 syz-executor
* 6452 342634 81452 0 7 0x4000000 syz-executor
40084 471070 56694 0 2 0 syz-executor
75685 47516 64991 0 2 0 syz-executor
75685 293580 64991 0 3 0x4000080 fsleep syz-executor
72644 238247 56112 0 3 0x80 nanoslp syz-executor
72644 496351 56112 0 2 0x4000000 syz-executor
64991 437344 34130 0 3 0x82 nanoslp syz-executor
26250 257269 0 0 3 0x14280 nfsidl nfsio
93938 243940 0 0 3 0x14280 nfsidl nfsio
60568 308319 0 0 3 0x14280 nfsidl nfsio
98593 255599 0 0 3 0x14280 nfsidl nfsio
3062 319057 0 0 3 0x14280 nfsidl nfsio
69535 519047 0 0 3 0x14280 nfsidl nfsio
46095 377888 0 0 3 0x14280 nfsidl nfsio
49107 184737 0 0 3 0x14280 nfsidl nfsio
58820 89698 0 0 3 0x14280 nfsidl nfsio
31112 376945 0 0 3 0x14280 nfsidl nfsio
30897 131128 0 0 3 0x14280 nfsidl nfsio
14333 211334 0 0 3 0x14280 nfsidl nfsio
12128 497961 0 0 3 0x14280 nfsidl nfsio
4433 192097 0 0 3 0x14280 nfsidl nfsio
86401 123285 0 0 3 0x14280 nfsidl nfsio
74846 174846 0 0 3 0x14280 nfsidl nfsio
28599 463157 0 0 3 0x14280 nfsidl nfsio
48466 408790 0 0 3 0x14280 nfsidl nfsio
66728 116035 0 0 3 0x14280 nfsidl nfsio
78481 444544 0 0 3 0x14280 nfsidl nfsio
7828 84258 34130 0 2 0x2 syz-executor
81456 397481 0 0 3 0x14200 acct acct
430 11562 0 0 3 0x14200 bored sosplice
96816 63100 96231 0 3 0x100082 sbwait arp
96231 361840 18972 0 3 0x10008a sigsusp sh
56112 1210 34130 0 3 0x82 nanoslp syz-executor
20275 194777 34130 0 3 0x82 nanoslp syz-executor
18972 165140 34130 0 3 0x82 wait syz-executor
56694 351657 34130 0 3 0x82 nanoslp syz-executor
81452 344074 34130 0 3 0x82 nanoslp syz-executor
7818 30690 34130 0 3 0x82 wait syz-executor
34130 90492 29986 0 3 0x82 kqread syz-executor
29986 389950 12286 0 3 0x10008a sigsusp ksh
12286 33793 37651 0 3 0x98 kqread sshd-session
37651 105660 82522 0 3 0x92 kqread sshd-session
85532 222653 1 0 3 0x100083 ttyin getty
82522 491620 1 0 3 0x88 kqread sshd
39404 436253 90474 74 3 0x1100092 bpf pflogd
90474 506420 1 0 3 0x80 sbwait pflogd
66016 401371 58380 73 3 0x1100090 kqread syslogd
58380 54855 1 0 3 0x100082 sbwait syslogd
23845 425322 1 0 3 0x100080 kqread resolvd
13340 371183 69948 77 3 0x100092 kqread dhcpleased
11512 150366 69948 77 3 0x100092 kqread dhcpleased
69948 370923 1 0 3 0x80 kqread dhcpleased
66236 153639 0 0 3 0x14200 bored smr
40877 31401 0 0 2 0x14200 zerothread
43722 193593 0 0 3 0x14200 aiodoned aiodoned
54391 297526 0 0 3 0x14200 syncer update
75998 185015 0 0 3 0x14200 cleaner cleaner
11506 440290 0 0 3 0x14200 reaper reaper
5359 4919 0 0 3 0x14200 pgdaemon pagedaemon
89902 219538 0 0 3 0x14200 bored viomb
31904 417756 0 0 3 0x40014200 acpi0 acpi0
6748 287611 0 0 7 0x40014200 idle1
55819 8559 0 0 3 0x14200 bored softnet3
60777 390940 0 0 3 0x14200 bored softnet2
69944 1184 0 0 3 0x14200 bored softnet1
59840 8942 0 0 3 0x14200 bored softnet0
34801 320016 0 0 3 0x14200 bored systqmp
42179 150393 0 0 3 0x14200 bored systq
31510 444454 0 0 3 0x14200 tmoslp softclockmp
60274 259784 0 0 3 0x40014200 tmoslp softclock
8250 4173 0 0 3 0x40014200 idle0
1 258850 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 6452 (syz-executor) thread 0xffff800037fee030 (342634)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8391fc68)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 unp_connect+0x26c sys/kern/uipc_usrreq.c:868
#2 uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607
#3 sosend+0x804 sys/kern/uipc_socket.c:-1
#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:579
#7 Xsyscall+0x128
exclusive rwlock sbufsnd r = 0 (0xffff800010fddb80)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2 sblock+0xb7 sys/kern/uipc_socket2.c:536
#3 sosend+0x2e2 sys/kern/uipc_socket.c:630
#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:579
#7 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10211 11100K 11283K 166960K 11772 0
pcb 17 16K 18K 166960K 207 0
rtable 215 8K 9K 166960K 455 0
pf 43 19K 19K 166960K 88 0
ifaddr 44 7K 7K 166960K 73 0
ifgroup 62 2K 2K 166960K 108 0
sysctl 4 1K 9K 166960K 8 0
counters 72 37K 37K 166960K 130 0
ioctlops 0 0K 4K 166960K 1765 0
iov 0 0K 12K 166960K 50 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1333 84K 84K 166960K 1737 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 13 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 21 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 18 65K 93K 166960K 535 0
sigio 0 0K 0K 166960K 75 0
proc 72 91K 140K 166960K 618 0
subproc 72 4K 4K 166960K 90 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 51 0
in_multi 89 6K 7K 166960K 129 0
ether_multi 1 0K 0K 166960K 5 0
mrt 0 0K 0K 166960K 3 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 79 360K 360K 166960K 79 0
exec 0 0K 1K 166960K 428 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 223 154K 168K 166960K 6374 0
UVM aobj 21 4K 4K 166960K 21 0
pinsyscall 44 88K 106K 166960K 1696 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 24 0
NDP 14 0K 1K 166960K 48 0
temp 79 8696K 8761K 166960K 14748 0
kqueue 14 22K 26K 166960K 86 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 26 0 0 1 0 1 1 0 8 0
rtpcb 120 73 0 69 1 0 1 1 0 8 0
rtentry 176 135 0 41 5 0 5 5 0 8 0
unpcb 144 239 0 221 3 1 2 2 0 8 1
syncache 336 5 0 5 1 1 0 1 0 8 0
tcpcb 808 100 0 96 1 0 1 1 0 8 0
arp 128 21 0 4 1 0 1 1 0 8 0
inpcb 328 655 0 647 19 12 7 13 0 8 6
nd6 144 28 0 6 1 0 1 1 0 8 0
pkpcb 40 5 0 5 1 1 0 1 0 8 0
kcovpl 48 10 0 2 1 0 1 1 0 8 0
ppxss 1192 24 0 23 2 1 1 1 0 8 0
pppxif 1504 1 0 1 1 0 1 1 0 8 1
pfstscr 40 1 0 1 1 1 0 1 0 8 0
pffrag 232 2 0 0 1 0 1 1 0 482 0
pffrnode 88 2 0 0 1 0 1 1 0 8 0
pffrent 40 71 0 68 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 46 0 1 1 0 1 1 0 8 0
pfstkey 128 50 0 5 2 0 2 2 0 8 0
pfstate 384 47 0 3 5 0 5 5 0 8 0
pfrule 1344 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 554 0 147 27 1 26 26 0 8 0
art_table 32 556 0 147 4 0 4 4 0 8 0
art_node 16 131 0 47 1 0 1 1 0 8 0
sysvmsgpl 40 3 0 3 2 2 0 1 0 8 0
semapl 112 17 0 7 1 0 1 1 0 8 0
shmpl 112 18 0 0 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 2343 0 841 95 0 95 95 0 8 0
ffsino 288 2343 0 841 109 0 109 109 0 8 0
nchpl 144 3067 0 1373 64 0 64 64 0 8 0
rtmask 32 8 0 8 1 1 0 1 0 8 0
uvmvnodes 80 2597 0 0 53 0 53 53 0 8 0
vnodes 216 2597 0 0 145 0 145 145 0 8 0
namei 1024 10456 0 10455 2 1 1 2 0 8 0
percpumem 16 80 0 29 1 0 1 1 0 8 0
kstatmem 264 62 0 32 4 1 3 3 0 8 1
scsiplug 72 1 0 1 1 1 0 1 0 8 0
scxspl 216 9202 0 9202 3 2 1 2 1 8 1
plimitpl 152 76 0 58 1 0 1 1 0 8 0
sigapl 424 862 0 790 9 0 9 9 0 8 0
knotepl 120 313 0 0 10 0 10 10 0 8 0
kqueuepl 224 188 0 176 3 0 3 3 0 8 2
pipepl 336 143 0 116 3 0 3 3 0 8 0
fdescpl 520 822 0 790 3 0 3 3 0 8 0
filepl 160 4640 0 4355 20 6 14 16 0 8 1
lockfpl 104 235 0 233 2 1 1 2 0 8 0
lockfspl 48 53 0 51 1 0 1 1 0 8 0
sessionpl 144 26 0 17 1 0 1 1 0 8 0
pgrppl 48 40 0 23 1 0 1 1 0 8 0
ucredpl 104 716 0 702 1 0 1 1 0 8 0
zombiepl 144 791 0 790 1 0 1 1 0 8 0
processpl 1240 862 0 790 6 0 6 6 0 8 0
procpl 656 1448 0 1372 8 0 8 8 0 8 1
srpgc 96 4 0 4 1 1 0 1 0 8 0
sosppl 168 4 0 4 1 1 0 1 0 8 0
sockpl 728 981 0 947 24 14 10 16 0 8 6
mcl64k 65536 3 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 127 0 0 16 0 16 16 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 28 0 0 4 0 4 4 0 8 0
mtagpl 96 8 0 0 1 0 1 1 0 8 0
mbufpl 256 268 0 0 17 0 17 17 0 8 0
bufpl 280 3035 0 125 208 0 208 208 0 8 0
anonpl 32 9724 0 0 79 0 79 79 0 246 0
amapchunkpl 152 21058 0 20634 36 10 26 31 0 158 5
amappl16 200 2542 0 2517 18 16 2 15 0 8 0
amappl15 192 13 0 12 1 0 1 1 0 8 0
amappl14 184 125 0 112 1 0 1 1 0 8 0
amappl13 176 3 0 3 1 1 0 1 0 8 0
amappl12 168 1505 0 1471 3 1 2 2 0 8 0
amappl11 160 49 0 35 1 0 1 1 0 8 0
amappl10 152 12 0 12 1 1 0 1 0 8 0
amappl9 144 244 0 244 1 1 0 1 0 8 0
amappl8 136 24 0 22 1 0 1 1 0 8 0
amappl7 128 123 0 110 1 0 1 1 0 8 0
amappl6 120 198 0 194 1 0 1 1 0 8 0
amappl5 112 136 0 126 1 0 1 1 0 8 0
amappl4 104 331 0 311 1 0 1 1 0 8 0
amappl3 96 3787 0 3688 5 1 4 4 0 8 0
amappl2 88 690 0 622 2 0 2 2 0 8 0
amappl1 80 10540 0 9917 15 1 14 15 0 8 0
amappl 88 5568 0 5422 5 0 5 5 0 92 0
dma32768 32768 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 7 0 7 2 2 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 20 0 0 1 0 1 1 0 8 0
uaddrrnd 24 822 0 790 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 822 0 790 1 0 1 1 0 8 0
vmmpekpl 168 8250 0 8200 3 0 3 3 0 8 0
vmmpepl 168 57768 0 55798 101 8 93 101 0 357 2
vmsppl 480 821 0 790 5 0 5 5 0 8 0
rwobjpl 72 20212 0 16656 66 0 66 66 0 8 0
pdppl 4096 1651 0 1580 109 34 75 85 0 8 4
pvpl 32 17623 0 0 144 1 143 143 0 265 0
pmappl 256 821 0 790 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 399 0 40 11 0 11 11 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(fffffd806f5321e0,9,0) at witness_checkorder+0x10fb sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffd806f5321c8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:232
rrw_enter(fffffd806f5321c8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:605
VOP_LOCK(fffffd806d1b2878,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
vn_lock(fffffd806d1b2878,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vfs_lookup(ffff800034fe9208) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418
namei(ffff800034fe9208) at namei+0x7aa sys/kern/vfs_lookup.c:250
unp_connect(ffff800010fdd9a8,fffffd806c30e800,ffff800037fee030) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868
uipc_dgram_send(ffff800010fdd9a8,fffffd806bfcaf00,fffffd806c30e800,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607
sosend(ffff800010fdd9a8,fffffd806c30e800,ffff800034fe9488,0,0,8) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff800037fee030,3,ffff800034fe9600,8,ffff800034fe96c0) at sendit+0x721 sys/kern/uipc_syscalls.c:779
sys_sendmsg(ffff800037fee030,ffff800034fe9770,ffff800034fe96c0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597
syscall(ffff800034fe9770) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800034fe9770) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5cd0b5903d0, count: -15
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+0x41e sys/dev/acpi/acpicpu_x86.c:1218
sched_idle(ffff8000299ddff0) at sched_idle+0x448 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: -5