Re: KVM segfaults with 3.5 while installing ubuntu 12.04

[Stefan Priebe <s.priebe@profihost.ag>]

Am 31.07.2012 16:54, schrieb Avi Kivity:
> On 07/31/2012 02:59 PM, Stefan Priebe - Profihost AG wrote:
>> Hello list,
>>
>> i hope it is correct to list the maintainers of kvm. While trying to
>> install ubuntu 12.04 amd64 on a kvm based vm the KVM process segfaults
>> while ubuntu tries to detect the HW:
>> kvm[2978]: segfault at 7fb90d9035e0 ip 00007fb90d9035e0
>> sp00007fff652e4ed8 error 15
>>
>> This does not happen with a rhel6 based 2.6.32 kernel so i thought this
>> must be a bug in vanilla 3.5.0 kernel.
>>
>> Is this known? What information do you need?
>>
> Please build qemu with debug information, generate a core, and post a
> backtrace.

mhm tried that but i can't get it to work:

gdb /usr/bin/qemu-system-x86_64 /core

GNU gdb (GDB) 7.0.1-debian
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License GPLv3+: GNU GPL version 3 or later 
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This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...

warning: The current binary is a PIE (Position Independent Executable), 
which
GDB does NOT currently support.  Most debugger features will fail if used
in this session.

Reading symbols from /usr/bin/qemu-system-x86_64...done.

warning: core file may not match specified executable file.
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Core was generated by `/usr/bin/qemu-system-x86_64 -id 103 -chardev 
socket,id=qmp,path=/var/run/qemu-s'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f6ca10faed8 in ?? ()
(gdb) where
#0  0x00007f6ca10faed8 in ?? ()
#1  0x00007f6ca54e0098 in ?? ()
#2  0x00007f6ca10faf18 in ?? ()
#3  0x00007f6ca10fae98 in ?? ()
#4  0x00007fffc18a5330 in ?? ()
#5  0x40620711c948c800 in ?? ()
#6  0x00007fffc18a51f0 in ?? ()
#7  0x00007f6ca54e0e25 in ?? ()
#8  0x00007f6ca10faf18 in ?? ()
#9  0x00007f6ca10fae98 in ?? ()
#10 0x0000000000000000 in ?? ()

Greets,
Stefan