qemu segfaulting when booting ext3 image

qemu segfaulting when booting ext3 image

[Khem Raj]

Hi

I am seeing qemu segfaulting when booting ext3 image. The same rootfs
boots fine over nfs. It does not give any useful message
as to what happened. I am using the runqemu script. Same used to work
fine 3 weeks back. I tried to blame compilers but the behavior
is same irrespective of gcc version I use or even eglibc/uclibc

Its on x86_64/ubuntu 11.04 host.

Anyone experiencing it ? bisecting can be a long excercise for this.

Thanks
-Khem

Re: qemu segfaulting when booting ext3 image

[Zhai, Edwin]

Did you installed Nvidia proprietary driver? Any error mesg from the 
runqemu script?
I can't figure out one case that nfs root works and ext3 image doesn't...


Khem Raj wrote:
>
> Hi
>
> I am seeing qemu segfaulting when booting ext3 image. The same rootfs
> boots fine over nfs. It does not give any useful message
> as to what happened. I am using the runqemu script. Same used to work
> fine 3 weeks back. I tried to blame compilers but the behavior
> is same irrespective of gcc version I use or even eglibc/uclibc
>
> Its on x86_64/ubuntu 11.04 host.
>
> Anyone experiencing it ? bisecting can be a long excercise for this.
>
> Thanks
> -Khem
>
> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
>

Re: qemu segfaulting when booting ext3 image

[Khem Raj]

On Mon, May 2, 2011 at 5:41 PM, Zhai, Edwin <edwin.zhai@intel.com> wrote:
> Did you installed Nvidia proprietary driver? Any error mesg from the runqemu
> script?

yes I did and I think that could be a culprit but then why would it
work with nfs boot.
there is no useful message from script it just collapses

> I can't figure out one case that nfs root works and ext3 image doesn't...
>
>
> Khem Raj wrote:
>>
>> Hi
>>
>> I am seeing qemu segfaulting when booting ext3 image. The same rootfs
>> boots fine over nfs. It does not give any useful message
>> as to what happened. I am using the runqemu script. Same used to work
>> fine 3 weeks back. I tried to blame compilers but the behavior
>> is same irrespective of gcc version I use or even eglibc/uclibc
>>
>> Its on x86_64/ubuntu 11.04 host.
>>
>> Anyone experiencing it ? bisecting can be a long excercise for this.
>>
>> Thanks
>> -Khem
>>
>> _______________________________________________
>> Openembedded-core mailing list
>> Openembedded-core@lists.openembedded.org
>> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
>>
>
> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
>

Re: qemu segfaulting when booting ext3 image

[Mark Hatle]

On 5/3/11 12:27 PM, Khem Raj wrote:
> On Mon, May 2, 2011 at 5:41 PM, Zhai, Edwin <edwin.zhai@intel.com> wrote:
>> Did you installed Nvidia proprietary driver? Any error mesg from the runqemu
>> script?
> 
> yes I did and I think that could be a culprit but then why would it
> work with nfs boot.
> there is no useful message from script it just collapses

The script tries to detect the nvidia drivers.  If it finds them is supposed to
issue a warning.  Sounds like your system might not have a version that it knows
how to detect.

>> I can't figure out one case that nfs root works and ext3 image doesn't...

Good question, I don't know.  In my experience both NFS and ext3 root crashes
with the nvidia drivers.  I have a patch to the version of QEMU I use that
disables all of GL to work around the problem.

I believe it's mhatle/qemu on poky-contrib... but it hasn't been updated for a
while now.

--Mark

>>
>>
>> Khem Raj wrote:
>>>
>>> Hi
>>>
>>> I am seeing qemu segfaulting when booting ext3 image. The same rootfs
>>> boots fine over nfs. It does not give any useful message
>>> as to what happened. I am using the runqemu script. Same used to work
>>> fine 3 weeks back. I tried to blame compilers but the behavior
>>> is same irrespective of gcc version I use or even eglibc/uclibc
>>>
>>> Its on x86_64/ubuntu 11.04 host.
>>>
>>> Anyone experiencing it ? bisecting can be a long excercise for this.
>>>
>>> Thanks
>>> -Khem
>>>
>>> _______________________________________________
>>> Openembedded-core mailing list
>>> Openembedded-core@lists.openembedded.org
>>> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
>>>
>>
>> _______________________________________________
>> Openembedded-core mailing list
>> Openembedded-core@lists.openembedded.org
>> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
>>
> 
> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core

Re: qemu segfaulting when booting ext3 image

[Khem Raj]

On (03/05/11 12:32), Mark Hatle wrote:
> >> I can't figure out one case that nfs root works and ext3 image doesn't...
> 
> Good question, I don't know.  In my experience both NFS and ext3 root crashes
> with the nvidia drivers.  I have a patch to the version of QEMU I use that
> disables all of GL to work around the problem.

just pass "<-nographic>" to the script

> 
> I believe it's mhatle/qemu on poky-contrib... but it hasn't been updated for a
> while now.

Re: qemu segfaulting when booting ext3 image

[Mark Hatle]

On 5/3/11 12:47 PM, Khem Raj wrote:
> On (03/05/11 12:32), Mark Hatle wrote:
>>>> I can't figure out one case that nfs root works and ext3 image doesn't...
>>
>> Good question, I don't know.  In my experience both NFS and ext3 root crashes
>> with the nvidia drivers.  I have a patch to the version of QEMU I use that
>> disables all of GL to work around the problem.
> 
> just pass "<-nographic>" to the script
> 
>>
>> I believe it's mhatle/qemu on poky-contrib... but it hasn't been updated for a
>> while now.

-nographic was not enough as the libGL system was still be initialized, and that
for me is where the crash occurred..

--Mark

> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core

Re: qemu segfaulting when booting ext3 image

[Scott Garman]

On 05/03/2011 10:32 AM, Mark Hatle wrote:
> On 5/3/11 12:27 PM, Khem Raj wrote:
>> On Mon, May 2, 2011 at 5:41 PM, Zhai, Edwin<edwin.zhai@intel.com>  wrote:
>>> Did you installed Nvidia proprietary driver? Any error mesg from the runqemu
>>> script?
>>
>> yes I did and I think that could be a culprit but then why would it
>> work with nfs boot.
>> there is no useful message from script it just collapses
>
> The script tries to detect the nvidia drivers.  If it finds them is supposed to
> issue a warning.  Sounds like your system might not have a version that it knows
> how to detect.

The Nvidia libGL bug caused a segfault in qemu when booting images, so 
it should be pretty obvious if that's what's causing it.

Given that Khem is booting the nfs version successfully, and not seeing 
any error message, I think this might be a new error.

Scott

-- 
Scott Garman
Embedded Linux Engineer - Yocto Project
Intel Open Source Technology Center

Re: qemu segfaulting when booting ext3 image

[Khem Raj]

On Tue, May 3, 2011 at 11:43 AM, Scott Garman <scott.a.garman@intel.com> wrote:
> On 05/03/2011 10:32 AM, Mark Hatle wrote:
>>
>> On 5/3/11 12:27 PM, Khem Raj wrote:
>>>
>>> On Mon, May 2, 2011 at 5:41 PM, Zhai, Edwin<edwin.zhai@intel.com>  wrote:
>>>>
>>>> Did you installed Nvidia proprietary driver? Any error mesg from the
>>>> runqemu
>>>> script?
>>>
>>> yes I did and I think that could be a culprit but then why would it
>>> work with nfs boot.
>>> there is no useful message from script it just collapses
>>
>> The script tries to detect the nvidia drivers.  If it finds them is
>> supposed to
>> issue a warning.  Sounds like your system might not have a version that it
>> knows
>> how to detect.
>
> The Nvidia libGL bug caused a segfault in qemu when booting images, so it
> should be pretty obvious if that's what's causing it.
>
> Given that Khem is booting the nfs version successfully, and not seeing any
> error message, I think this might be a new error.
>

the host system is 64-bit kubuntu 11.04 with nvidia proprietary
drivers. IIRC it worked fine without them but that was a month back.


> Scott
>
> --
> Scott Garman
> Embedded Linux Engineer - Yocto Project
> Intel Open Source Technology Center
>
> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
>

Re: qemu segfaulting when booting ext3 image

[Scott Garman]

On 05/03/2011 11:43 AM, Scott Garman wrote:
> On 05/03/2011 10:32 AM, Mark Hatle wrote:
>> On 5/3/11 12:27 PM, Khem Raj wrote:
>>> On Mon, May 2, 2011 at 5:41 PM, Zhai, Edwin<edwin.zhai@intel.com> wrote:
>>>> Did you installed Nvidia proprietary driver? Any error mesg from the
>>>> runqemu
>>>> script?
>>>
>>> yes I did and I think that could be a culprit but then why would it
>>> work with nfs boot.
>>> there is no useful message from script it just collapses
>>
>> The script tries to detect the nvidia drivers. If it finds them is
>> supposed to
>> issue a warning. Sounds like your system might not have a version that
>> it knows
>> how to detect.
>
> The Nvidia libGL bug caused a segfault in qemu when booting images, so
> it should be pretty obvious if that's what's causing it.
>
> Given that Khem is booting the nfs version successfully, and not seeing
> any error message, I think this might be a new error.

Of course, after replying to this message, I read the subject line when 
it reappeared on the list. My apologizes for not understanding that qemu 
is indeed segfaulting.

So it's quite possible Khem is running into the same bug.

Scott

-- 
Scott Garman
Embedded Linux Engineer - Yocto Project
Intel Open Source Technology Center

Re: qemu segfaulting when booting ext3 image

[Zhai, Edwin]

Raj,
We have a bug for Nvidia driver @ 
http://bugzilla.pokylinux.org/show_bug.cgi?id=649
and a fix @
http://git.pokylinux.org/cgit.cgi/poky-contrib/commit/?h=gzhai/fix2&id=f596757000465a4b8350e16f21553a23b8bbedfa

I think it deserves a try.

BTW, where is your gl library, including original one and Nvidia's? I 
doubt the layout may changes in ubuntu 11.04, so that our code failed to 
detect it.

Thanks,
edwin


Khem Raj wrote:
>
> On Tue, May 3, 2011 at 11:43 AM, Scott Garman 
> <scott.a.garman@intel.com> wrote:
> > On 05/03/2011 10:32 AM, Mark Hatle wrote:
> >>
> >> On 5/3/11 12:27 PM, Khem Raj wrote:
> >>>
> >>> On Mon, May 2, 2011 at 5:41 PM, Zhai, Edwin<edwin.zhai@intel.com> 
>  wrote:
> >>>>
> >>>> Did you installed Nvidia proprietary driver? Any error mesg from the
> >>>> runqemu
> >>>> script?
> >>>
> >>> yes I did and I think that could be a culprit but then why would it
> >>> work with nfs boot.
> >>> there is no useful message from script it just collapses
> >>
> >> The script tries to detect the nvidia drivers.  If it finds them is
> >> supposed to
> >> issue a warning.  Sounds like your system might not have a version 
> that it
> >> knows
> >> how to detect.
> >
> > The Nvidia libGL bug caused a segfault in qemu when booting images, 
> so it
> > should be pretty obvious if that's what's causing it.
> >
> > Given that Khem is booting the nfs version successfully, and not 
> seeing any
> > error message, I think this might be a new error.
> >
>
> the host system is 64-bit kubuntu 11.04 with nvidia proprietary
> drivers. IIRC it worked fine without them but that was a month back.
>
>
> > Scott
> >
> > --
> > Scott Garman
> > Embedded Linux Engineer - Yocto Project
> > Intel Open Source Technology Center
> >
> > _______________________________________________
> > Openembedded-core mailing list
> > Openembedded-core@lists.openembedded.org
> > http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
> >
>
> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
>

Re: qemu segfaulting when booting ext3 image

[Khem Raj]

On Wed, May 4, 2011 at 5:40 PM, Zhai, Edwin <edwin.zhai@intel.com> wrote:
> Raj,
> We have a bug for Nvidia driver @
> http://bugzilla.pokylinux.org/show_bug.cgi?id=649
> and a fix @
> http://git.pokylinux.org/cgit.cgi/poky-contrib/commit/?h=gzhai/fix2&id=f596757000465a4b8350e16f21553a23b8bbedfa
>
> I think it deserves a try.
>
> BTW, where is your gl library, including original one and Nvidia's? I doubt
> the layout may changes in ubuntu 11.04, so that our code failed to detect
> it.

yes this helps indeed. Please propose this patch for oe-core's
scripts/runqemu-internal

Thanks
-Khem

Re: qemu segfaulting when booting ext3 image

[Zhai, Edwin]

Khem Raj wrote:
>
> On Wed, May 4, 2011 at 5:40 PM, Zhai, Edwin <edwin.zhai@intel.com> wrote:
> > Raj,
> > We have a bug for Nvidia driver @
> > http://bugzilla.pokylinux.org/show_bug.cgi?id=649
> > and a fix @
> > 
> http://git.pokylinux.org/cgit.cgi/poky-contrib/commit/?h=gzhai/fix2&id=f596757000465a4b8350e16f21553a23b8bbedfa 
> <http://git.pokylinux.org/cgit.cgi/poky-contrib/commit/?h=gzhai/fix2&id=f596757000465a4b8350e16f21553a23b8bbedfa> 
>
> >
> > I think it deserves a try.
> >
> > BTW, where is your gl library, including original one and Nvidia's? 
> I doubt
> > the layout may changes in ubuntu 11.04, so that our code failed to 
> detect
> > it.
>
> yes this helps indeed. Please propose this patch for oe-core's
> scripts/runqemu-internal
>

After discussion, we found this patch only works for Ubuntu(Fedora 
installed Nvidia driver in different way), and there is no elegant fix 
for all distribution. So we decided that just give out useful info and 
let end user to do the right thing for their own distribution.

> Thanks
> -Khem
>
> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
>

Re: qemu segfaulting when booting ext3 image

[Khem Raj]

On (05/05/11 14:31), Zhai, Edwin wrote:
> 
> 
> Khem Raj wrote:
> >
> >On Wed, May 4, 2011 at 5:40 PM, Zhai, Edwin <edwin.zhai@intel.com> wrote:
> >> Raj,
> >> We have a bug for Nvidia driver @
> >> http://bugzilla.pokylinux.org/show_bug.cgi?id=649
> >> and a fix @
> >> http://git.pokylinux.org/cgit.cgi/poky-contrib/commit/?h=gzhai/fix2&id=f596757000465a4b8350e16f21553a23b8bbedfa <http://git.pokylinux.org/cgit.cgi/poky-contrib/commit/?h=gzhai/fix2&id=f596757000465a4b8350e16f21553a23b8bbedfa>
> >
> >>
> >> I think it deserves a try.
> >>
> >> BTW, where is your gl library, including original one and
> >Nvidia's? I doubt
> >> the layout may changes in ubuntu 11.04, so that our code failed
> >to detect
> >> it.
> >
> >yes this helps indeed. Please propose this patch for oe-core's
> >scripts/runqemu-internal
> >
> 
> After discussion, we found this patch only works for Ubuntu(Fedora
> installed Nvidia driver in different way), and there is no elegant
> fix for all distribution. So we decided that just give out useful
> info and let end user to do the right thing for their own
> distribution.

We could always poke for distro type and distro versions if need be via
parsing ( /etc/lsb-release e.g.)
and do whatever distro needs in conditionals.

> 
> >Thanks
> >-Khem
> >
> >_______________________________________________
> >Openembedded-core mailing list
> >Openembedded-core@lists.openembedded.org
> >http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
> >
> 
> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core

-- 
-Khem