panic: kernel diagnostic assertion "_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_device.c", line 230
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
192231 75679 0 0 0 1 syz-executor.0
*505203 92961 0 0 0x4000000 0 syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824526a8) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c05ca,ffffffff8244b560,e6,ffffffff824ced3e) at __assert+0x25 sys/kern/subr_prf.c:161
udv_reference(ffff800000b52480) at udv_reference+0x84 sys/uvm/uvm_device.c:230
uvm_mapent_clone(fffffd8008586730,0,3000,0,7,7) at uvm_mapent_clone+0x1a2 sys/uvm/uvm_map.c:3810
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c uvm_mapent_share sys/uvm/uvm_map.c:3840 [inline]
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c sys/uvm/uvm_map.c:3739
vm_impl_init_vmx(ffff800023293a40,ffff800021252540) at vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
vmmioctl(a00,c5005601,ffff800000b57800,1,ffff800021252540) at vmmioctl+0x1f2
VOP_IOCTL(fffffd806e154830,c5005601,ffff800000b57800,1,fffffd807f7d86c0,ffff800021252540) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd80645e5280,c5005601,ffff800000b57800,ffff800021252540) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021252540,ffff800023291538,ffff800023291580) at sys_ioctl+0x4a2
syscall(ffff800023291600) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800023291600) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x35472f3d600, count: 1
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: kernel diagnostic assertion "_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_device.c", line 230
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824526a8) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c05ca,ffffffff8244b560,e6,ffffffff824ced3e) at __assert+0x25 sys/kern/subr_prf.c:161
udv_reference(ffff800000b52480) at udv_reference+0x84 sys/uvm/uvm_device.c:230
uvm_mapent_clone(fffffd8008586730,0,3000,0,7,7) at uvm_mapent_clone+0x1a2 sys/uvm/uvm_map.c:3810
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c uvm_mapent_share sys/uvm/uvm_map.c:3840 [inline]
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c sys/uvm/uvm_map.c:3739
vm_impl_init_vmx(ffff800023293a40,ffff800021252540) at vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
vmmioctl(a00,c5005601,ffff800000b57800,1,ffff800021252540) at vmmioctl+0x1f2
VOP_IOCTL(fffffd806e154830,c5005601,ffff800000b57800,1,fffffd807f7d86c0,ffff800021252540) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd80645e5280,c5005601,ffff800000b57800,ffff800021252540) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021252540,ffff800023291538,ffff800023291580) at sys_ioctl+0x4a2
syscall(ffff800023291600) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800023291600) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x35472f3d600, count: -14
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800023290ea0
rbx 0xffffffff82828bff cpu_info_full_primary+0x2bff
rdx 0x8b
rcx 0x2
rax 0x8c
r8 0xffffffff820a9ca4 kprintf+0x144
r9 0x1
r10 0xc1772241ca573511
r11 0xbf97a082c3efaf64
r12 0xffffffff82828a00 cpu_info_full_primary+0x2a00
r13 0
r14 0
r15 0x1
rip 0xffffffff8230ccb8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800023290e90
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=505203 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=32, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff8000212522a0,0xffff8000212527f0
process=0xffff8000ffffae18 user=0xffff80002328c000, vmspace=0xfffffd806f035e68
estcpu=36, cpticks=6, pctcpu=0.0
user=0, sys=2, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
75679 192231 53394 0 7 0 syz-executor.0
75679 192092 53394 0 2 0x4000000 syz-executor.0
92961 85714 36435 0 2 0 syz-executor.1
*92961 505203 36435 0 7 0x4000000 syz-executor.1
36435 453157 13710 0 2 0x482 syz-executor.1
53394 465636 13710 0 2 0x482 syz-executor.0
13710 486600 38023 0 3 0x82 thrsleep syz-fuzzer
13710 505906 38023 0 2 0x4000482 syz-fuzzer
13710 348493 38023 0 3 0x4000082 thrsleep syz-fuzzer
13710 300960 38023 0 3 0x4000082 thrsleep syz-fuzzer
13710 160694 38023 0 3 0x4000082 thrsleep syz-fuzzer
13710 414039 38023 0 3 0x4000082 thrsleep syz-fuzzer
13710 485736 38023 0 3 0x4000082 thrsleep syz-fuzzer
13710 514877 38023 0 3 0x4000082 kqread syz-fuzzer
38023 216163 15155 0 3 0x10008a sigsusp ksh
15155 71207 8610 0 3 0x9a select sshd
31193 521155 1 0 3 0x100083 ttyin getty
8610 208689 1 0 3 0x88 select sshd
71651 273758 64881 74 3 0x100092 bpf pflogd
64881 312229 1 0 3 0x80 netio pflogd
17629 345331 60661 73 3 0x100090 kqread syslogd
60661 462567 1 0 3 0x100082 netio syslogd
74182 522701 1 0 3 0x100080 kqread resolvd
98664 304609 22109 77 3 0x100092 kqread dhcpleased
54119 360830 22109 77 3 0x100092 kqread dhcpleased
22109 448930 1 0 3 0x80 kqread dhcpleased
78801 515149 0 0 3 0x14200 bored smr
77706 204608 0 0 2 0x14200 zerothread
76585 474381 0 0 3 0x14200 aiodoned aiodoned
99809 146253 0 0 3 0x14200 syncer update
57919 106289 0 0 3 0x14200 cleaner cleaner
70758 187519 0 0 3 0x14200 reaper reaper
12900 458268 0 0 3 0x14200 pgdaemon pagedaemon
24502 199352 0 0 3 0x14200 bored crynlk
95810 100075 0 0 3 0x14200 bored crypto
84794 225045 0 0 3 0x14200 bored viomb
93805 416084 0 0 3 0x40014200 acpi0 acpi0
90720 83800 0 0 3 0x40014200 idle1
55617 350080 0 0 3 0x14200 bored softnet
46275 264796 0 0 3 0x14200 bored systqmp
68420 146462 0 0 3 0x14200 bored systq
91271 50830 0 0 3 0x40014200 bored softclock
37642 347058 0 0 3 0x40014200 idle0
1 23560 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 92961 (syz-executor.1) thread 0xffff800021252540 (505203)
shared rwlock vmmaplk r = 0 (0xfffffd806f035e80)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 uvm_share+0xd2 vm_map_lock_read_ln sys/uvm/uvm_map.c:5447 [inline]
#1 uvm_share+0xd2 sys/uvm/uvm_map.c:3691
#2 vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
#3 vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
#3 vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
#4 vmmioctl+0x1f2
#5 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
#6 vn_ioctl+0xba sys/kern/vfs_vnops.c:531
#7 sys_ioctl+0x4a2
#8 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#9 Xsyscall+0x128
exclusive rwlock vmmaplk r = 0 (0xfffffd8008586748)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5425
#3 uvm_share+0xaa vm_map_lock_read_ln sys/uvm/uvm_map.c:5446 [inline]
#3 uvm_share+0xaa sys/uvm/uvm_map.c:3691
#4 vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
#5 vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
#5 vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
#6 vmmioctl+0x1f2
#7 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
#8 vn_ioctl+0xba sys/kern/vfs_vnops.c:531
#9 sys_ioctl+0x4a2
#10 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#10 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#11 Xsyscall+0x128
exclusive rwlock vmlistlock r = 0 (0xffff800000655c78)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 vm_create+0x12e vm_impl_init sys/arch/amd64/amd64/vmm.c:1688 [inline]
#1 vm_create+0x12e sys/arch/amd64/amd64/vmm.c:1510
#2 vmmioctl+0x1f2
#3 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
#4 vn_ioctl+0xba sys/kern/vfs_vnops.c:531
#5 sys_ioctl+0x4a2
#6 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#7 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10118 6420K 6420K 78643K 11208 0
pcb 13 8K 8K 78643K 13 0
rtable 106 3K 3K 78643K 172 0
ifaddr 44 10K 10K 78643K 45 0
counters 44 34K 34K 78643K 44 0
ioctlops 1 2K 4K 78643K 1483 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 6 0
vnodes 1216 76K 76K 78643K 1222 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 1K 1K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 6 17K 25K 78643K 39 0
proc 67 87K 111K 78643K 334 0
subproc 32 2K 2K 78643K 34 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 33 2K 2K 78643K 33 0
ether_multi 1 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 25 122K 122K 78643K 25 0
exec 0 0K 2K 78643K 404 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 0
UVM amap 233 43K 43K 78643K 2145 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 10 0K 0K 78643K 10 0
temp 65 4195K 4259K 78643K 2358 0
kqueue 10 14K 14K 78643K 10 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 21 0 18 1 0 1 1 0 8 0
rtentry 112 45 0 1 2 0 2 2 0 8 0
unpcb 120 36 0 20 1 0 1 1 0 8 0
syncache 296 4 0 4 1 1 0 1 0 8 0
tcpqe 32 2119 0 2119 1 0 1 1 0 8 1
tcpcb 736 10 0 6 1 0 1 1 0 8 0
arp 120 6 0 0 1 0 1 1 0 8 0
inpcb 304 42 0 35 1 0 1 1 0 8 0
nd6 48 6 0 0 1 0 1 1 0 8 0
kcovpl 48 2 0 0 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 12 0 1 1 0 1 1 0 8 0
pfstkey 112 12 0 1 1 0 1 1 0 8 0
pfstate 320 12 0 1 1 0 1 1 0 8 0
pfrule 1360 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 256 188 0 0 12 0 12 12 0 8 0
art_table 32 189 0 0 2 0 2 2 0 8 0
art_node 16 44 0 4 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1443 0 32 89 0 89 89 0 8 0
ffsino 272 1443 0 32 95 0 95 95 0 8 0
nchpl 144 1677 0 57 61 0 61 61 0 8 0
uvmvnodes 72 1487 0 0 28 0 28 28 0 8 0
vnodes 224 1487 0 0 88 0 88 88 0 8 0
namei 1024 4695 0 4695 2 1 1 1 0 8 1
percpumem 16 34 0 0 1 0 1 1 0 8 0
vcpupl 2048 1 0 0 1 0 1 1 0 8 0
vmpool 560 2 0 0 1 0 1 1 0 8 0
scxspl 216 4964 0 4964 10 2 8 8 0 8 8
plimitpl 152 17 0 8 1 0 1 1 0 8 0
sigapl 424 289 0 254 5 0 5 5 0 8 1
futexpl 56 73 0 73 1 0 1 1 0 8 1
knotepl 112 58 0 0 2 0 2 2 0 8 0
kqueuepl 216 11 0 0 1 0 1 1 0 8 0
pipepl 336 83 0 72 1 0 1 1 0 8 0
fdescpl 496 273 0 254 3 0 3 3 0 8 0
filepl 152 1254 0 1129 5 0 5 5 0 8 0
lockfpl 104 9 0 7 1 0 1 1 0 8 0
lockfspl 48 5 0 3 1 0 1 1 0 8 0
sessionpl 144 18 0 7 1 0 1 1 0 8 0
pgrppl 48 18 0 7 1 0 1 1 0 8 0
ucredpl 96 63 0 51 1 0 1 1 0 8 0
zombiepl 144 254 0 254 2 1 1 1 0 8 1
processpl 1072 289 0 254 3 0 3 3 0 8 0
procpl 672 307 0 263 4 0 4 4 0 8 0
sockpl 480 99 0 73 4 0 4 4 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 5 0 0 1 0 1 1 0 8 0
mcl4k 4096 4 0 0 1 0 1 1 0 8 0
mcl2k 2048 268 0 0 33 0 33 33 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 310 0 0 19 0 19 19 0 8 0
bufpl 280 3436 0 136 236 0 236 236 0 8 0
anonpl 24 58192 0 36624 133 2 131 131 0 186 1
amapchunkpl 152 4540 0 3862 30 2 28 28 0 158 0
amappl16 200 947 0 139 43 0 43 43 0 8 0
amappl14 184 7 0 1 1 0 1 1 0 8 0
amappl13 176 30 0 28 1 0 1 1 0 8 0
amappl12 168 17 0 12 1 0 1 1 0 8 0
amappl11 160 47 0 33 1 0 1 1 0 8 0
amappl10 152 41 0 35 1 0 1 1 0 8 0
amappl9 144 243 0 238 1 0 1 1 0 8 0
amappl8 136 360 0 327 2 0 2 2 0 8 0
amappl7 128 71 0 57 1 0 1 1 0 8 0
amappl6 120 132 0 120 1 0 1 1 0 8 0
amappl5 112 173 0 154 1 0 1 1 0 8 0
amappl4 104 571 0 548 1 0 1 1 0 8 0
amappl3 96 53 0 45 1 0 1 1 0 8 0
amappl2 88 475 0 421 2 0 2 2 0 8 0
amappl1 80 7949 0 7496 15 4 11 13 0 8 1
amappl 88 1829 0 1653 5 0 5 5 0 92 1
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 64 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 275 0 254 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 275 0 254 1 0 1 1 0 8 0
vmmpekpl 168 6582 0 6551 2 0 2 2 0 8 0
vmmpepl 168 29334 0 27087 134 0 134 134 0 357 36
vmsppl 368 274 0 254 2 0 2 2 0 8 0
rwobjpl 56 8598 0 7010 24 0 24 24 0 8 1
pdppl 4096 558 0 509 70 20 50 50 0 8 1
pvpl 32 178822 0 153334 208 1 207 207 0 265 0
pmappl 224 274 0 254 2 0 2 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 336 0 24 9 0 9 9 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824526a8) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c05ca,ffffffff8244b560,e6,ffffffff824ced3e) at __assert+0x25 sys/kern/subr_prf.c:161
udv_reference(ffff800000b52480) at udv_reference+0x84 sys/uvm/uvm_device.c:230
uvm_mapent_clone(fffffd8008586730,0,3000,0,7,7) at uvm_mapent_clone+0x1a2 sys/uvm/uvm_map.c:3810
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c uvm_mapent_share sys/uvm/uvm_map.c:3840 [inline]
uvm_share(fffffd8008586730,0,7,fffffd806f035e68,20000000,200000) at uvm_share+0x45c sys/uvm/uvm_map.c:3739
vm_impl_init_vmx(ffff800023293a40,ffff800021252540) at vm_impl_init_vmx+0xb4 sys/arch/amd64/amd64/vmm.c:1591
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b vm_impl_init sys/arch/amd64/amd64/vmm.c:1690 [inline]
vm_create(ffff800000b57800,ffff800021252540) at vm_create+0x19b sys/arch/amd64/amd64/vmm.c:1510
vmmioctl(a00,c5005601,ffff800000b57800,1,ffff800021252540) at vmmioctl+0x1f2
VOP_IOCTL(fffffd806e154830,c5005601,ffff800000b57800,1,fffffd807f7d86c0,ffff800021252540) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd80645e5280,c5005601,ffff800000b57800,ffff800021252540) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021252540,ffff800023291538,ffff800023291580) at sys_ioctl+0x4a2
syscall(ffff800023291600) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800023291600) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x35472f3d600, count: -14
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a 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+0x23
end of kernel
end trace frame: 0x7f7ffffd9c30, count: 12
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a 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+0x23
end of kernel
end trace frame: 0x7f7ffffd9c30, count: -3