uvm_fault(0xfffffd8063dba250, 0x0, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at VOP_LOCK+0x72: movq 0(%rax),%r14
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*292097 74676 0 0x2 0 0K syz-executor.5
VOP_LOCK(fffffd8072624d90,1) at VOP_LOCK+0x72 sys/kern/vfs_vops.c:515
vn_lock(fffffd8072624d90,1) at vn_lock+0x84 sys/kern/vfs_vnops.c:564
vget(fffffd8072624d90,1) at vget+0x200 sys/kern/vfs_subr.c:676
ufs_ihashget(400,cacb) at ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
ffs_vget(ffff8000006d9c00,cacb,ffff80002e423818) at ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314
ufs_lookup() at ufs_lookup+0x122c sys/ufs/ufs/ufs_lookup.c:582
VOP_LOOKUP(fffffd8062463950,ffff80002e423c78,ffff80002e423ca8) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002e423c48) at vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566
namei(ffff80002e423c48) at namei+0x55a sys/kern/vfs_lookup.c:250
vn_open(ffff80002e423c48,30001,0) at vn_open+0xf8 sys/kern/vfs_vnops.c:140
doopenat(ffff80002124e558,ffffff9c,76e59eadc7d0,30000,0,ffff80002e423e20) at doopenat+0x26e sys/kern/vfs_syscalls.c:1126
syscall(ffff80002e423ea0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff80002e423ea0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x76e59eadc2d0, count: 2
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: uvm_fault(0xfffffd8063dba250, 0x0, 0, 1) -> e
ddb{0}> trace
VOP_LOCK(fffffd8072624d90,1) at VOP_LOCK+0x72 sys/kern/vfs_vops.c:515
vn_lock(fffffd8072624d90,1) at vn_lock+0x84 sys/kern/vfs_vnops.c:564
vget(fffffd8072624d90,1) at vget+0x200 sys/kern/vfs_subr.c:676
ufs_ihashget(400,cacb) at ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
ffs_vget(ffff8000006d9c00,cacb,ffff80002e423818) at ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314
ufs_lookup() at ufs_lookup+0x122c sys/ufs/ufs/ufs_lookup.c:582
VOP_LOOKUP(fffffd8062463950,ffff80002e423c78,ffff80002e423ca8) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002e423c48) at vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566
namei(ffff80002e423c48) at namei+0x55a sys/kern/vfs_lookup.c:250
vn_open(ffff80002e423c48,30001,0) at vn_open+0xf8 sys/kern/vfs_vnops.c:140
doopenat(ffff80002124e558,ffffff9c,76e59eadc7d0,30000,0,ffff80002e423e20) at doopenat+0x26e sys/kern/vfs_syscalls.c:1126
syscall(ffff80002e423ea0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff80002e423ea0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x76e59eadc2d0, count: -13
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80002e4235c0
rbx 0xffffffff82bb9ff0 cpu_info_full_primary+0x1ff0
rdx 0
rcx 0xffff80002124e558
rax 0
r8 0x30
r9 0
r10 0xd40e22a498ddc20f
r11 0x1ec548d5455febec
r12 0
r13 0
r14 0xfffffd8072624d90
r15 0
rip 0xffffffff81432252 VOP_LOCK+0x72
cs 0x8
rflags 0x10203 __ALIGN_SIZE+0xf203
rsp 0xffff80002e423570
ss 0x10
VOP_LOCK+0x72: movq 0(%rax),%r14
ddb{0}> show proc
PROC (syz-executor.5) tid=292097 pid=74676 tcnt=1 stat=onproc
flags process=2<EXEC> proc=0
runpri=82, usrpri=82, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0
forw=0xffffffffffffffff, list=0xffff8000228f4010,0xffff8000228f5d58
process=0xffff8000ffff6a08 user=0xffff80002e41e000, vmspace=0xfffffd8063dba250
estcpu=36, cpticks=1, pctcpu=0.1, user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
36434 244621 54400 0 2 0 syz-executor.2
44200 236024 73155 0 2 0 syz-executor.1
44200 278842 73155 0 3 0x4000080 fsleep syz-executor.1
24467 396264 84296 0 2 0 syz-executor.4
24467 304675 84296 0 3 0x4000080 fsleep syz-executor.4
24467 364833 84296 0 3 0x4000080 fsleep syz-executor.4
77757 76369 95024 0 2 0 syz-executor.0
77757 512801 95024 0 3 0x4000080 fsleep syz-executor.0
43635 305301 20966 0 2 0 syz-executor.7
20966 459714 37780 0 3 0x82 nanoslp syz-executor.7
*74676 292097 37780 0 7 0x2 syz-executor.5
95024 146185 37780 0 2 0x482 syz-executor.0
54400 124433 37780 0 3 0x82 nanoslp syz-executor.2
63618 321321 1 0 3 0x100083 ttyin getty
73155 396979 37780 0 3 0x82 nanoslp syz-executor.1
93606 481968 37780 0 2 0x2 syz-executor.6
53882 294096 0 0 3 0x14200 acct acct
34593 336711 0 0 3 0x14280 nfsidl nfsio
73862 3785 0 0 3 0x14280 nfsidl nfsio
16500 40283 0 0 3 0x14280 nfsidl nfsio
21679 513304 0 0 3 0x14280 nfsidl nfsio
13533 19886 0 0 3 0x14280 nfsidl nfsio
80803 321033 0 0 3 0x14280 nfsidl nfsio
33333 376516 0 0 3 0x14280 nfsidl nfsio
39997 482950 0 0 3 0x14280 nfsidl nfsio
59953 117295 0 0 3 0x14280 nfsidl nfsio
25141 432837 0 0 3 0x14280 nfsidl nfsio
49096 257667 0 0 3 0x14280 nfsidl nfsio
11346 479143 0 0 3 0x14280 nfsidl nfsio
93141 261033 0 0 3 0x14280 nfsidl nfsio
82114 227983 0 0 3 0x14280 nfsidl nfsio
76408 73689 0 0 3 0x14280 nfsidl nfsio
89198 409797 0 0 3 0x14280 nfsidl nfsio
26953 79823 0 0 3 0x14280 nfsidl nfsio
72520 275921 0 0 3 0x14280 nfsidl nfsio
52651 373587 0 0 3 0x14280 nfsidl nfsio
40605 102104 0 0 3 0x14280 nfsidl nfsio
5631 65772 0 0 3 0x14200 bored sosplice
6876 338309 50694 0 3 0x100082 netio arp
50694 72581 1 0 3 0x10008a sigsusp sh
42638 338972 37780 0 3 0x82 nanoslp syz-executor.3
84296 416773 37780 0 2 0x482 syz-executor.4
37780 477993 31299 0 3 0x2000082 wait syz-fuzzer
37780 424918 31299 0 2 0x6000482 syz-fuzzer
37780 266221 31299 0 3 0x6000082 thrsleep syz-fuzzer
37780 48076 31299 0 3 0x6000082 thrsleep syz-fuzzer
37780 184249 31299 0 3 0x6000082 thrsleep syz-fuzzer
37780 504988 31299 0 3 0x6000082 wait syz-fuzzer
37780 375017 31299 0 3 0x6000082 wait syz-fuzzer
37780 102685 31299 0 3 0x6000082 wait syz-fuzzer
37780 247681 31299 0 3 0x6000082 kqread syz-fuzzer
37780 170491 31299 0 3 0x6000082 thrsleep syz-fuzzer
37780 60045 31299 0 3 0x6000082 thrsleep syz-fuzzer
37780 387112 31299 0 3 0x6000082 wait syz-fuzzer
37780 82426 31299 0 3 0x6000082 wait syz-fuzzer
37780 320322 31299 0 3 0x6000082 wait syz-fuzzer
37780 144353 31299 0 3 0x6000082 thrsleep syz-fuzzer
37780 130741 31299 0 3 0x6000082 wait syz-fuzzer
31299 32409 43033 0 3 0x10008a sigsusp ksh
43033 108495 23873 0 3 0x9a kqread sshd
23873 417468 1 0 3 0x88 kqread sshd
43795 153740 24084 74 3 0x1100092 bpf pflogd
24084 9500 1 0 3 0x80 netio pflogd
1992 523939 83422 73 3 0x1100090 kqread syslogd
83422 174458 1 0 3 0x100082 netio syslogd
32598 457897 1 0 3 0x100080 kqread resolvd
58684 363890 83035 77 3 0x100092 kqread dhcpleased
62286 127304 83035 77 3 0x100092 kqread dhcpleased
83035 349356 1 0 3 0x80 kqread dhcpleased
83479 122576 0 0 3 0x14200 bored smr
29599 22763 0 0 2 0x14200 zerothread
96236 476678 0 0 3 0x14200 aiodoned aiodoned
72582 283741 0 0 3 0x14200 syncer update
90419 203521 0 0 3 0x14200 cleaner cleaner
81907 355269 0 0 3 0x14200 reaper reaper
13044 259039 0 0 3 0x14200 pgdaemon pagedaemon
23109 120810 0 0 3 0x14200 bored viomb
17065 190508 0 0 3 0x40014200 acpi0 acpi0
45308 307870 0 0 7 0x40014200 idle1
51452 149901 0 0 3 0x14200 bored softnet3
85065 34954 0 0 3 0x14200 bored softnet2
95962 427594 0 0 3 0x14200 bored softnet1
22419 430323 0 0 3 0x14200 bored softnet0
50168 134257 0 0 3 0x14200 bored systqmp
27563 45480 0 0 3 0x14200 bored systq
1894 69184 0 0 3 0x14200 tmoslp softclockmp
80142 375585 0 0 2 0x40014200 softclock
44546 138874 0 0 3 0x40014200 idle0
1 423205 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 74676 (syz-executor.5) thread 0xffff80002124e558 (292097)
Process 93606 (syz-executor.6) thread 0xffff80002123d298 (481968)
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10246 6639K 7085K 78643K 31865 0
pcb 13 22K 26K 78643K 1307 0
rtable 254 15K 16K 78643K 1806 0
pf 35 10K 10K 78643K 269 0
ifaddr 46 16K 17K 78643K 229 0
ifgroup 60 2K 2K 78643K 407 0
sysctl 4 1K 1K 78643K 8 0
counters 62 36K 36K 78643K 284 0
ioctlops 0 0K 4K 78643K 2224 0
iov 0 0K 36K 78643K 2280 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1567 98K 98K 78643K 9724 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 228 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 15 0
dirhash 75 13K 20K 78643K 19395 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 17 61K 85K 78643K 18993 0
sigio 0 0K 0K 78643K 806 0
proc 76 91K 116K 78643K 2011 0
subproc 117 7K 7K 78643K 397 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 744 0
in_multi 99 7K 7K 78643K 443 0
ether_multi 1 0K 0K 78643K 23 0
mrt 1 0K 0K 78643K 21 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 277 1235K 1235K 78643K 277 0
exec 0 0K 1K 78643K 3766 0
tdb 3 0K 0K 78643K 3 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 8 62K 64K 78643K 10 0
UVM amap 585 746K 747K 78643K 186342 0
UVM aobj 131 4K 4K 78643K 140 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 582 0
NDP 15 0K 1K 78643K 182 0
temp 74 5920K 6005K 78643K 179249 0
kqueue 16 20K 27K 78643K 1218 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 977 0 973 15 14 1 5 0 8 0
rtentry 112 437 0 320 4 0 4 4 0 8 0
unpcb 144 23253 0 23238 172 166 6 15 0 8 5
syncache 304 186 0 186 31 30 1 1 0 8 1
tcpqe 32 477 0 477 28 27 1 1 0 8 1
tcpcb 808 18102 0 18085 283 275 8 22 0 8 5
arp 120 63 0 44 1 0 1 1 0 8 0
ipq 40 6 0 6 2 2 0 1 0 8 0
ipqe 40 18 0 18 2 2 0 1 0 8 0
inpcb 368 24438 0 24416 296 288 8 21 0 8 4
nd6 136 103 0 73 2 0 2 2 0 8 0
pkpcb 40 10 0 10 3 3 0 1 0 8 0
kcovpl 48 30 0 21 1 0 1 1 0 8 0
ppxss 1256 49 0 49 13 13 0 1 0 8 0
pffrag 232 141 0 139 6 5 1 1 0 482 0
pffrnode 88 140 0 139 6 5 1 1 0 8 0
pffrent 40 479 0 477 7 6 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 24 482 0 470 1 0 1 1 0 8 0
pfstkey 128 482 0 470 2 0 2 2 0 8 0
pfstate 376 482 0 470 19 15 4 6 0 8 0
pfrule 1344 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 1437 0 959 31 1 30 30 0 8 0
art_table 32 1438 0 959 4 0 4 4 0 8 0
art_node 16 362 0 255 1 0 1 1 0 8 0
sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0
semupl 112 4 0 4 1 1 0 1 0 8 0
semapl 112 10 0 0 1 0 1 1 0 8 0
shmpl 112 137 0 9 4 0 4 4 0 8 0
dirhash 1024 6481 0 6443 7 1 6 7 0 8 0
dino2pl 256 27780 0 26243 97 0 97 97 0 8 0
ffsino 272 27780 0 26243 104 0 104 104 0 8 0
nchpl 144 55900 0 55388 63 40 23 63 0 8 0
uvmvnodes 80 7068 0 0 145 0 145 145 0 8 0
vnodes 216 7068 0 0 393 0 393 393 0 8 0
vnodes: pool(0xffffffff82c9bcf8:vnodes): page inconsistency: page 0x0; at page head addr 0xfffffd8072624f90 (p 0xfffffd8072624000)
namei 1024 182952 0 182951 12 11 1 2 0 8 0
percpumem 16 155 0 111 1 0 1 1 0 8 0
vcpupl 2048 94 0 3 12 0 12 12 0 8 0
vmpool 696 120 0 29 9 0 9 9 0 8 0
kstatmem 264 248 0 222 4 2 2 3 0 8 0
scxspl 216 174268 0 174268 34 33 1 8 1 8 1
plimitpl 152 2923 0 2905 1 0 1 1 0 8 0
sigapl 424 19331 0 19260 13 4 9 9 0 8 0
futexpl 64 169840 0 169836 12 11 1 1 0 8 0
knotepl 120 958 0 0 19 4 15 16 0 8 0
kqueuepl 216 3322 0 3313 80 79 1 8 0 8 0
pipepl 320 4132 0 4100 133 125 8 12 0 8 5
fdescpl 496 19266 0 19236 8 3 5 5 0 8 0
filepl 152 137963 0 137698 256 238 18 27 0 8 7
lockfpl 104 13500 0 13498 26 25 1 2 0 8 0
lockfspl 48 3554 0 3552 1 0 1 1 0 8 0
sessionpl 144 52 0 34 1 0 1 1 0 8 0
pgrppl 48 997 0 979 1 0 1 1 0 8 0
ucredpl 104 16750 0 16731 1 0 1 1 0 8 0
zombiepl 144 19261 0 19260 3 2 1 1 0 8 0
processpl 1072 19331 0 19260 6 1 5 5 0 8 0
procpl 680 51346 0 51256 23 14 9 10 0 8 0
sosppl 168 194 0 194 15 15 0 1 0 8 0
sockpl 488 48703 0 48661 933 919 14 63 0 8 7
mcl64k 65536 17 0 0 3 0 3 3 0 8 0
mcl16k 16384 25 0 0 4 1 3 3 0 8 0
mcl12k 12288 29 0 0 2 0 2 2 0 8 0
mcl9k 9216 15 0 0 2 0 2 2 0 8 0
mcl8k 8192 17 0 0 3 0 3 3 0 8 0
mcl4k 4096 36 0 0 3 0 3 3 0 8 0
mcl2k2 2112 7 0 0 1 0 1 1 0 8 0
mcl2k 2048 480 0 0 40 17 23 40 0 8 0
mtagpl 96 1044 0 0 21 1 20 21 0 8 0
mbufpl 256 13621 0 0 836 0 836 836 0 8 0
bufpl 288 36560 0 29489 506 0 506 506 0 8 0
anonpl 24 1757207 0 1744752 211 108 103 119 0 186 0
amapchunkpl 152 582780 0 581904 135 93 42 52 0 158 1
amappl16 200 30597 0 30106 123 96 27 40 0 8 0
amappl15 192 7 0 7 1 1 0 1 0 8 0
amappl14 184 237 0 219 2 1 1 2 0 8 0
amappl13 176 13 0 13 2 2 0 1 0 8 0
amappl12 168 20276 0 20244 3 1 2 2 0 8 0
amappl11 160 54 0 40 1 0 1 1 0 8 0
amappl10 152 65 0 53 2 1 1 1 0 8 0
amappl9 144 376 0 374 1 0 1 1 0 8 0
amappl8 136 878 0 710 6 0 6 6 0 8 0
amappl7 128 379 0 351 2 0 2 2 0 8 0
amappl6 120 778 0 761 1 0 1 1 0 8 0
amappl5 112 474 0 462 1 0 1 1 0 8 0
amappl4 104 860 0 824 2 1 1 2 0 8 0
amappl3 96 114688 0 114598 20 16 4 4 0 8 0
amappl2 88 21986 0 21903 9 7 2 3 0 8 0
amappl1 80 77333 0 76755 24 11 13 23 0 8 0
amappl 88 183668 0 183373 10 2 8 8 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 72 139 0 9 3 0 3 3 0 8 0
uaddrrnd 24 19386 0 19265 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 19386 0 19265 1 0 1 1 0 8 0
vmmpekpl 168 146844 0 146762 5 0 5 5 0 8 0
vmmpepl 168 1130731 0 1128072 446 301 145 145 0 357 17
vmsppl 464 19385 0 19265 18 2 16 16 0 8 0
rwobjpl 56 267155 0 258170 141 12 129 130 0 8 0
pdppl 4096 38780 0 38621 787 622 165 166 0 8 6
pvpl 32 5366325 0 5347632 634 439 195 339 0 265 7
pmappl 248 19385 0 19265 9 1 8 8 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 3064 0 1245 53 0 53 53 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
VOP_LOCK(fffffd8072624d90,1) at VOP_LOCK+0x72 sys/kern/vfs_vops.c:515
vn_lock(fffffd8072624d90,1) at vn_lock+0x84 sys/kern/vfs_vnops.c:564
vget(fffffd8072624d90,1) at vget+0x200 sys/kern/vfs_subr.c:676
ufs_ihashget(400,cacb) at ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
ffs_vget(ffff8000006d9c00,cacb,ffff80002e423818) at ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314
ufs_lookup() at ufs_lookup+0x122c sys/ufs/ufs/ufs_lookup.c:582
VOP_LOOKUP(fffffd8062463950,ffff80002e423c78,ffff80002e423ca8) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002e423c48) at vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566
namei(ffff80002e423c48) at namei+0x55a sys/kern/vfs_lookup.c:250
vn_open(ffff80002e423c48,30001,0) at vn_open+0xf8 sys/kern/vfs_vnops.c:140
doopenat(ffff80002124e558,ffffff9c,76e59eadc7d0,30000,0,ffff80002e423e20) at doopenat+0x26e sys/kern/vfs_syscalls.c:1126
syscall(ffff80002e423ea0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff80002e423ea0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x76e59eadc2d0, count: -13
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp
x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020d58ff0) at sched_idle+0x41e sys/kern/kern_sched.c:191
end trace frame: 0x0, count: 10
ddb{1}> trace
x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020d58ff0) at sched_idle+0x41e sys/kern/kern_sched.c:191
end trace frame: 0x0, count: -5