kvm: Dump state on SIGQUIT
This patch adds state dumping to SIGQUIT signal handler to make debugging
infinite loops easier. If a kernel gets stuck under KVM, you can press Ctrl-4
and then use 'addr2line' to figure out the exact location where it's stuck from
the reported 'rip':
^\[ 0.000000] Calibrating delay loop... Registers:
rip:
ffffffff816a0c83 rsp:
ffffffff81c01eb8 flags:
0000000000000246
rax:
00000000ffff8ad0 rbx:
ffffffff81d541a0 rcx:
00000000ffffffff
rdx:
00000000ffff8ad0 rsi:
0000000000000046 rdi:
0000000000002000
rbp:
ffffffff81c01f28 r8:
00000000000003fd r9:
0000000000000000
r10:
0000000000000000 r11:
000000000000000d r12:
ffffffff81d56d20
r13:
0000000000000000 r14:
ffffffffffffffff r15:
0000000000013690
cr0:
000000008005003b cr2:
0000000000000000 cr3:
0000000001c08000
cr4:
00000000000006b0 cr8:
0000000000000000
Segment registers:
register selector base limit type p dpl db s l g avl
cs 0010
0000000000000000 ffffffff 0b 1 0 0 1 1 1 0
ss 0000
0000000000000000 ffffffff 00 0 0 0 0 0 0 0
ds 0000
0000000000000000 ffffffff 00 0 0 0 0 0 0 0
es 0000
0000000000000000 ffffffff 00 0 0 0 0 0 0 0
fs 0000
0000000000000000 ffffffff 00 0 0 0 0 0 0 0
gs 0000
ffff880002000000 ffffffff 00 0 0 0 0 0 0 0
tr 0040
ffff880002011bc0 00002087 0b 1 0 0 0 0 0 0
ldt 0000
0000000000000000 ffffffff 00 0 0 0 0 0 0 0
gdt
ffff880002004000 0000007f
idt
ffffffff81de9000 00000fff
[ efer:
0000000000000d01 apic base:
0000000000000000 nmi: enabled ]
Interrupt bitmap:
0000000000000000 0000000000000000 0000000000000000 0000000000000000
Code:
Stack:
penberg@tiger:~/vm$ addr2line -e vmlinux
0xffffffff816a0c83
/home/penberg/linux/init/calibrate.c:149
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
projects / karo-tx-linux.git / commit