linux-kernel - Re: KVM segfaults with 3.5 while installing ubuntu 12.04

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Message-ID: <50181647.5000701@profihost.ag>
Date:	Tue, 31 Jul 2012 19:30:47 +0200
From:	Stefan Priebe <s.priebe@...fihost.ag>
To:	Avi Kivity <avi@...hat.com>
CC:	mtosatti@...hat.com, kvm@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: KVM segfaults with 3.5 while installing ubuntu 12.04

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
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
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
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