uvm_fault(0xffffffff838fce98, 0xffff8000253b2004, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at ffs_fragextend+0x1c8: movl 0x4(%rbx),%r14d
TID PID UID PRFLAGS PFLAGS CPU COMMAND
61475 52326 0 0 0 1 syz-executor
*371210 77492 0 0x2 0x1 0K syz-executor
ffs_fragextend(fffffd806f562bb8,4,78ae8,3000,3800) at ffs_fragextend+0x1c8 ffs_cgread sys/ufs/ffs/ffs_alloc.c:856 [inline]
ffs_fragextend(fffffd806f562bb8,4,78ae8,3000,3800) at ffs_fragextend+0x1c8 sys/ufs/ffs/ffs_alloc.c:890
ffs_realloccg(fffffd806f562bb8,2,78ae8,3000,3800,fffffd80097fb270,b28f66ed1551b04,fffffd806da64a70) at ffs_realloccg+0x53a sys/ufs/ffs/ffs_alloc.c:225
ffs2_balloc(fffffd806f562bb8,afb1,58,fffffd80097fb270,1,ffff80002a3ce4a8) at ffs2_balloc+0x54d sys/ufs/ffs/ffs_balloc.c:516
ffs_write(ffff80002a3ce530) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806abc48b8,ffff80002a3ce5e0,3,fffffd80097fb270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a282550,fffffd806abc48b8,fffffd80097fb270,ffff80002a3ce6b0,ffff80002a3ce690) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691
ktrsyscall(ffff80002a282550,5b,10,ffff80002a3ce840) at ktrsyscall+0x340 ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrsyscall(ffff80002a282550,5b,10,ffff80002a3ce840) at ktrsyscall+0x340 sys/kern/kern_ktrace.c:183
syscall(ffff80002a3ce840) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline]
syscall(ffff80002a3ce840) at syscall+0x304 sys/arch/amd64/amd64/trap.c:746
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b39b3a44e50, count: 6
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(0xffffffff838fce98, 0xffff8000253b2004, 0, 1) -> d
ddb{0}> trace
ffs_fragextend(fffffd806f562bb8,4,78ae8,3000,3800) at ffs_fragextend+0x1c8 ffs_cgread sys/ufs/ffs/ffs_alloc.c:856 [inline]
ffs_fragextend(fffffd806f562bb8,4,78ae8,3000,3800) at ffs_fragextend+0x1c8 sys/ufs/ffs/ffs_alloc.c:890
ffs_realloccg(fffffd806f562bb8,2,78ae8,3000,3800,fffffd80097fb270,b28f66ed1551b04,fffffd806da64a70) at ffs_realloccg+0x53a sys/ufs/ffs/ffs_alloc.c:225
ffs2_balloc(fffffd806f562bb8,afb1,58,fffffd80097fb270,1,ffff80002a3ce4a8) at ffs2_balloc+0x54d sys/ufs/ffs/ffs_balloc.c:516
ffs_write(ffff80002a3ce530) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806abc48b8,ffff80002a3ce5e0,3,fffffd80097fb270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a282550,fffffd806abc48b8,fffffd80097fb270,ffff80002a3ce6b0,ffff80002a3ce690) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691
ktrsyscall(ffff80002a282550,5b,10,ffff80002a3ce840) at ktrsyscall+0x340 ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrsyscall(ffff80002a282550,5b,10,ffff80002a3ce840) at ktrsyscall+0x340 sys/kern/kern_ktrace.c:183
syscall(ffff80002a3ce840) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline]
syscall(ffff80002a3ce840) at syscall+0x304 sys/arch/amd64/amd64/trap.c:746
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b39b3a44e50, count: -9
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80002a3ce1d0
rbx 0xffff8000253b2000
rdx 0
rcx 0xffff80002a282550
rax 0xfffffd806856ea10
r8 0xffffffffffffffff
r9 0x78ae8 acpi_pdirpa+0x64959
r10 0xffff80002a3ce3a8
r11 0x9ac01261568e8873
r12 0x7
r13 0xffff800000b2d800
r14 0
r15 0xffff800000b2d800
rip 0xffffffff813311b8 ffs_fragextend+0x1c8
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80002a3ce100
ss 0x10
ffs_fragextend+0x1c8: movl 0x4(%rbx),%r14d
ddb{0}> show proc
PROC (syz-executor) tid=371210 pid=77492 tcnt=1 stat=onproc
flags process=2<EXEC> proc=1<INKTR>
runpri=32, usrpri=84, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a2827e8,0xffff8000333e9278
process=0xffff8000fffeeb68 user=0xffff80002a3c9000, vmspace=0xfffffd800b027b70
estcpu=34, cpticks=83, pctcpu=0.24, user=2, sys=81, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
52326 61475 55666 0 7 0 syz-executor
52326 258652 55666 0 2 0x4000000 syz-executor
70068 502126 77742 0 2 0 syz-executor
70068 19388 77742 0 2 0x4000000 syz-executor
58792 485622 8869 0 2 0 syz-executor
58792 143882 8869 0 3 0x4000080 fifow syz-executor
58792 411491 8869 0 3 0x4000080 fsleep syz-executor
8887 147798 62575 0 2 0xc80 syz-executor
8887 269827 62575 0 3 0x4000080 ttyout syz-executor
8887 431777 62575 0 3 0x4000080 netacc syz-executor
8887 240148 62575 0 3 0x4000080 fsleep syz-executor
93966 61987 77492 60929 2 0xc90 syz-executor
93966 209677 77492 60929 3 0x4000090 ttyout syz-executor
93966 380168 77492 60929 3 0x4000090 fsleep syz-executor
10161 459336 88170 0 2 0xc80 syz-executor
10161 313331 88170 0 3 0x4000080 kqread syz-executor
10161 82857 88170 0 3 0x4000080 fsleep syz-executor
8869 100263 42285 0 2 0xc82 syz-executor
38508 450084 0 0 3 0x14200 acct acct
20793 202769 42285 0 2 0xc82 syz-executor
62575 338239 42285 0 2 0xc82 syz-executor
88373 181771 1 0 3 0x100083 ttyopn getty
63065 439307 0 0 3 0x14200 bored sosplice
*77492 371210 42285 0 7 0x3 syz-executor
88170 333026 42285 0 2 0xc82 syz-executor
93016 5025 42285 0 2 0xc82 syz-executor
55666 151363 42285 0 2 0xc82 syz-executor
77742 109812 42285 0 3 0x82 nanoslp syz-executor
42285 408966 50748 0 3 0x82 kqread syz-executor
50748 359214 75392 0 3 0x10008a sigsusp ksh
75392 122064 83632 0 3 0x98 kqread sshd-session
83632 418963 80184 0 3 0x92 kqread sshd-session
80184 411363 1 0 3 0x88 kqread sshd
10035 329319 21501 74 3 0x1100092 bpf pflogd
21501 207245 1 0 3 0x80 sbwait pflogd
24478 299146 20063 73 3 0x1100090 kqread syslogd
20063 399357 1 0 3 0x100082 sbwait syslogd
81916 520245 1 0 3 0x100080 kqread resolvd
24936 493026 79187 77 3 0x100092 kqread dhcpleased
38802 108552 79187 77 3 0x100092 kqread dhcpleased
79187 444503 1 0 3 0x80 kqread dhcpleased
3797 510990 0 0 3 0x14200 bored smr
81187 219836 0 0 2 0x14200 zerothread
67695 226094 0 0 3 0x14200 aiodoned aiodoned
61894 361464 0 0 3 0x14200 syncer update
98049 197294 0 0 3 0x14200 cleaner cleaner
95379 25775 0 0 3 0x14200 reaper reaper
109 201978 0 0 3 0x14200 pgdaemon pagedaemon
48401 376671 0 0 3 0x14200 bored viomb
48836 214254 0 0 3 0x40014200 acpi0 acpi0
92344 94160 0 0 3 0x40014200 idle1
22658 178122 0 0 3 0x14200 bored softnet1
51107 299313 0 0 3 0x14200 bored softnet0
82926 404215 0 0 3 0x14200 bored systqmp
59178 237783 0 0 3 0x14200 bored systq
70532 336343 0 0 3 0x14200 tmoslp softclockmp
94248 52750 0 0 3 0x40014200 tmoslp softclock
99163 125112 0 0 3 0x40014200 idle0
1 152684 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{0}> show all locks
Process 77492 (syz-executor) thread 0xffff80002a282550 (371210)
exclusive rrwlock inode r = 0 (0xfffffd806f562c58)
#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+0xa3 sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vget+0x2a2 sys/kern/vfs_subr.c:693
#6 ktrwriteraw+0x175 sys/kern/kern_ktrace.c:688
#7 ktrsyscall+0x340 ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
#7 ktrsyscall+0x340 sys/kern/kern_ktrace.c:183
#8 syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline]
#8 syscall+0x304 sys/arch/amd64/amd64/trap.c:746
#9 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838f9630)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
#1 ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183
#2 syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline]
#2 syscall+0x304 sys/arch/amd64/amd64/trap.c:746
#3 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10209 11035K 11702K 166960K 12184 0
pcb 18 13K 20K 166960K 230 0
rtable 204 9K 9K 166960K 512 0
pf 38 18K 81K 166960K 143 0
ifaddr 39 6K 8K 166960K 98 0
ifgroup 55 2K 2K 166960K 157 0
sysctl 4 1K 9K 166960K 13 0
counters 68 36K 37K 166960K 170 0
ioctlops 0 0K 4K 166960K 1777 0
iov 0 0K 24K 166960K 124 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1364 86K 86K 166960K 2040 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 1K 1K 166960K 46 0
dirhash 12 2K 2K 166960K 45 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 18 65K 236K 166960K 1224 0
sigio 0 0K 0K 166960K 14 0
proc 73 115K 164K 166960K 721 0
subproc 72 4K 4K 166960K 99 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 170 0
in_multi 85 6K 7K 166960K 187 0
ether_multi 1 0K 0K 166960K 14 0
mrt 1 0K 0K 166960K 13 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 97 440K 440K 166960K 97 0
exec 0 0K 1K 166960K 620 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 262 160K 176K 166960K 12835 0
UVM aobj 10 2K 2K 166960K 12 0
pinsyscall 43 86K 103K 166960K 2421 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 1K 166960K 73 0
NDP 12 0K 2K 166960K 69 0
temp 72 8649K 8755K 166960K 56959 0
kqueue 15 24K 33K 166960K 253 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 120 110 0 106 1 0 1 1 0 8 0
rtentry 176 156 0 73 5 0 5 5 0 8 0
unpcb 144 939 0 915 5 2 3 4 0 8 2
syncache 336 8 0 8 3 3 0 1 0 8 0
tcpqe 32 3 0 3 2 2 0 1 0 8 0
tcpcb 736 379 0 371 8 1 7 7 0 8 6
arp 136 18 0 6 1 0 1 1 0 8 0
inpcb 328 1223 0 1207 12 5 7 7 0 8 5
nd6 144 31 0 11 1 0 1 1 0 8 0
pkpcb 40 13 0 13 4 3 1 1 0 8 1
kcovpl 48 11 0 3 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 1 0 1 0 8 0
ppxss 1192 39 0 39 2 1 1 1 0 8 1
pppxif 1504 3 0 3 2 1 1 1 0 8 1
pfstscr 40 1 0 1 1 1 0 1 0 8 0
pffrag 232 8 0 1 1 0 1 1 0 482 0
pffrnode 88 8 0 1 1 0 1 1 0 8 0
pffrent 40 18 0 10 1 0 1 1 0 8 0
pfosfp 40 1430 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1430 0 714 21 0 21 21 0 8 0
pfrktable 1344 1 0 1 1 1 0 1 0 8 0
pfanchor 1288 2 0 0 1 0 1 1 0 8 0
pftag 88 1 0 0 1 0 1 1 0 8 0
pfstitem 24 70 0 27 1 0 1 1 0 8 0
pfstkey 128 73 0 29 2 0 2 2 0 8 0
pfstate 384 69 0 28 5 0 5 5 0 8 0
pfrule 1344 25 0 20 2 1 1 2 0 8 0
rttmr 136 5 0 5 2 2 0 1 0 8 0
art_heap8 4096 3 0 0 3 0 3 3 0 8 0
art_heap4 256 735 0 352 32 7 25 28 0 8 0
art_table 40 738 0 352 5 0 5 5 0 8 0
art_node 32 152 0 78 1 0 1 1 0 8 0
sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 41 0 31 1 0 1 1 0 8 0
shmpl 112 9 0 2 1 0 1 1 0 8 0
dirhash 1024 40 0 23 3 0 3 3 0 8 0
dino2pl 256 3534 0 2022 95 0 95 95 0 8 0
ffsino 296 3534 0 2022 117 0 117 117 0 8 0
nchpl 144 5172 0 3466 64 0 64 64 0 8 0
rtmask 32 5 0 5 3 2 1 1 0 8 1
uvmvnodes 80 3922 0 0 81 0 81 81 0 8 0
vnodes 216 3922 0 0 218 0 218 218 0 8 0
namei 1024 18286 0 18286 1 0 1 1 0 8 1
percpumem 16 100 0 51 1 0 1 1 0 8 0
kstatmem 264 98 0 70 4 1 3 3 0 8 1
scsiplug 72 7 0 7 3 2 1 1 0 8 1
scxspl 216 22210 0 22210 10 6 4 8 1 8 4
plimitpl 152 352 0 335 1 0 1 1 0 8 0
sigapl 424 1542 0 1492 9 2 7 8 0 8 0
knotepl 120 535 0 0 16 0 16 16 0 8 0
kqueuepl 224 614 0 602 10 5 5 7 0 8 4
pipepl 344 207 0 180 3 0 3 3 0 8 0
fdescpl 528 1499 0 1467 3 0 3 3 0 8 0
filepl 160 9507 0 9269 20 5 15 16 0 8 4
lockfpl 104 634 0 632 4 3 1 4 0 8 0
lockfspl 48 162 0 160 1 0 1 1 0 8 0
sessionpl 144 30 0 21 1 0 1 1 0 8 0
pgrppl 48 49 0 32 1 0 1 1 0 8 0
ucredpl 104 1164 0 1150 1 0 1 1 0 8 0
zombiepl 144 1494 0 1492 1 0 1 1 0 8 0
processpl 1232 1542 0 1492 6 0 6 6 0 8 0
procpl 664 3351 0 3290 9 3 6 8 0 8 0
sosppl 168 8 0 8 2 1 1 1 0 8 1
sockpl 752 2347 0 2303 18 6 12 12 0 8 7
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl9k 9216 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 120 0 0 15 0 15 15 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 67 0 0 8 0 8 8 0 8 0
mtagpl 96 5 0 0 1 0 1 1 0 8 0
mbufpl 256 1155 0 0 72 0 72 72 0 8 0
bufpl 280 8974 0 2831 439 0 439 439 0 8 0
anonpl 32 8813 0 0 72 1 71 71 0 246 0
amapchunkpl 152 42585 0 41980 47 19 28 40 0 158 0
amappl16 200 4502 0 4467 21 9 12 16 0 8 5
amappl15 192 6 0 6 1 1 0 1 0 8 0
amappl14 184 164 0 152 1 0 1 1 0 8 0
amappl13 176 5 0 5 1 1 0 1 0 8 0
amappl12 168 2206 0 2174 4 1 3 3 0 8 0
amappl11 160 51 0 37 1 0 1 1 0 8 0
amappl10 152 6 0 5 1 0 1 1 0 8 0
amappl9 144 249 0 249 2 1 1 1 0 8 1
amappl8 136 20 0 17 1 0 1 1 0 8 0
amappl7 128 123 0 110 1 0 1 1 0 8 0
amappl6 120 230 0 227 1 0 1 1 0 8 0
amappl5 112 137 0 127 1 0 1 1 0 8 0
amappl4 104 325 0 305 1 0 1 1 0 8 0
amappl3 96 7423 0 7316 3 0 3 3 0 8 0
amappl2 88 1779 0 1698 2 0 2 2 0 8 0
amappl1 80 13734 0 13129 15 0 15 15 0 8 0
amappl 88 11892 0 11701 5 0 5 5 0 92 0
dma65536 65536 1 0 1 1 1 0 1 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma2048 2048 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 7 0 7 2 1 1 1 0 8 1
dma128 128 255 0 255 2 1 1 1 0 8 1
dma64 64 39 0 39 2 2 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 11 0 2 1 0 1 1 0 8 0
uaddrrnd 24 1500 0 1468 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1500 0 1468 1 0 1 1 0 8 0
vmmpekpl 168 12760 0 12708 3 0 3 3 0 8 0
vmmpepl 168 98736 0 96670 106 7 99 104 0 357 4
vmsppl 488 1499 0 1468 5 0 5 5 0 8 0
rwobjpl 80 31299 0 26398 103 0 103 103 0 8 2
pdppl 4096 3008 0 2936 116 42 74 86 0 8 2
pvpl 32 17309 0 0 141 1 140 140 0 265 0
pmappl 256 1499 0 1468 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 369 0 58 9 0 9 9 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
ffs_fragextend(fffffd806f562bb8,4,78ae8,3000,3800) at ffs_fragextend+0x1c8 ffs_cgread sys/ufs/ffs/ffs_alloc.c:856 [inline]
ffs_fragextend(fffffd806f562bb8,4,78ae8,3000,3800) at ffs_fragextend+0x1c8 sys/ufs/ffs/ffs_alloc.c:890
ffs_realloccg(fffffd806f562bb8,2,78ae8,3000,3800,fffffd80097fb270,b28f66ed1551b04,fffffd806da64a70) at ffs_realloccg+0x53a sys/ufs/ffs/ffs_alloc.c:225
ffs2_balloc(fffffd806f562bb8,afb1,58,fffffd80097fb270,1,ffff80002a3ce4a8) at ffs2_balloc+0x54d sys/ufs/ffs/ffs_balloc.c:516
ffs_write(ffff80002a3ce530) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806abc48b8,ffff80002a3ce5e0,3,fffffd80097fb270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a282550,fffffd806abc48b8,fffffd80097fb270,ffff80002a3ce6b0,ffff80002a3ce690) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:691
ktrsyscall(ffff80002a282550,5b,10,ffff80002a3ce840) at ktrsyscall+0x340 ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrsyscall(ffff80002a282550,5b,10,ffff80002a3ce840) at ktrsyscall+0x340 sys/kern/kern_ktrace.c:183
syscall(ffff80002a3ce840) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline]
syscall(ffff80002a3ce840) at syscall+0x304 sys/arch/amd64/amd64/trap.c:746
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b39b3a44e50, count: -9
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299edff0) 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
end of kernel
end trace frame: 0x72bf484fdf90, count: 12
ddb{1}> trace
x86_ipi_db(ffff8000299edff0) 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
end of kernel
end trace frame: 0x72bf484fdf90, count: -3