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Old 07-08-2010, 04:11 PM
Julien Cristau
 
Default Bug#588426: linux-image-2.6.32-5-amd64: fail to boot in a kvm virtual machine

On Thu, Jul 8, 2010 at 10:36:48 +0200, Vincent Danjean wrote:

> Package: linux-2.6
> Version: 2.6.32-16
> Severity: important
>
> Hi,
>
> I tried to install linux-image-2.6.32-5-amd64/2.6.32-16 in a kvm virtual
> machine. With this kernel, it fails to boot. The virtual machine freeze after
> the line:
> [ 0.324387] Write protecting the kernel read-only data: 4220k
> (see below the full boot log taken from a serial console)
> I tried to boot both with a serial console (attached to a tty in the host)
> and with a vga video emulated screen. Same things happened.
>
> The kvm machine is a lenny with a few package from unstable
>
> Regards,
> Vincent
>
> PS: the severity can be increased if lots of people experiments the same thing
> or lowered if this is specific to my configuration.
>
Likely the same as reported by weasel at
http://lkml.indiana.edu/hypermail/linux/kernel/1007.0/02385.html

Cheers,
Julien
 
Old 07-08-2010, 04:20 PM
Cristian Greco
 
Default Bug#588426: linux-image-2.6.32-5-amd64: fail to boot in a kvm virtual machine

On Thu, 08 Jul 2010 10:36:48 +0200
Vincent Danjean <vdanjean@debian.org> wrote:

> Package: linux-2.6
> Version: 2.6.32-16
> Severity: important
>
> Hi,
>
> I tried to install linux-image-2.6.32-5-amd64/2.6.32-16 in a kvm
> virtual machine. With this kernel, it fails to boot. The virtual
> machine freeze after the line:
> [ 0.324387] Write protecting the kernel read-only data: 4220k
> (see below the full boot log taken from a serial console)
> I tried to boot both with a serial console (attached to a tty in the
> host) and with a vga video emulated screen. Same things happened.
>
> The kvm machine is a lenny with a few package from unstable
>
> Regards,
> Vincent
>
> PS: the severity can be increased if lots of people experiments the
> same thing or lowered if this is specific to my configuration.

Hi,

I can confirm I had the very same problem with a kvm virtual machine
(amd64) upgraded from squeeze to sid. Downgrading to 2.6.32-15 from
squeeze made it able to boot again.

Thanks,
--
Cristian Greco
GPG key ID: 0xCF4D32E4
 
Old 07-12-2010, 08:22 AM
Bjørn Mork
 
Default Bug#588426: linux-image-2.6.32-5-amd64: fail to boot in a kvm virtual machine

Vincent Danjean <vdanjean@debian.org> writes:

> Package: linux-2.6
> Version: 2.6.32-16
> Severity: important

[..]

> PS: the severity can be increased if lots of people experiments the same thing
> or lowered if this is specific to my configuration.

At first, I thought that the severity was appropriate as this bug
doesn't break *all* systems, and the kernel is somewhat special in that
most bugs will affect "the whole system".

But I must admit that I was a bit surprised when 2.6.32-17 was uploaded
without a fix for this problem. It makes me wonder if the severity
shouldn't have been higher after all.... Just to be clear: This bug
does break all KVM based systems, making them completely unbootable, and
requiring console access to fix. I'm pretty sure there are plenty of
KVM based hosting solutions around where this will be a severe problem.

Is KVM a supported "hardware" platform i Debian? I would expect so. If
it is, then please raise the severity of this bug high enough to reflect
this.


Thanks,
Bjørn



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Old 07-12-2010, 11:02 AM
Ben Hutchings
 
Default Bug#588426: linux-image-2.6.32-5-amd64: fail to boot in a kvm virtual machine

On Mon, 2010-07-12 at 10:22 +0200, Bjørn Mork wrote:
> Vincent Danjean <vdanjean@debian.org> writes:
>
> > Package: linux-2.6
> > Version: 2.6.32-16
> > Severity: important
>
> [..]
>
> > PS: the severity can be increased if lots of people experiments the same thing
> > or lowered if this is specific to my configuration.
>
> At first, I thought that the severity was appropriate as this bug
> doesn't break *all* systems, and the kernel is somewhat special in that
> most bugs will affect "the whole system".
>
> But I must admit that I was a bit surprised when 2.6.32-17 was uploaded
> without a fix for this problem. It makes me wonder if the severity
> shouldn't have been higher after all.... Just to be clear: This bug
> does break all KVM based systems, making them completely unbootable, and
> requiring console access to fix. I'm pretty sure there are plenty of
> KVM based hosting solutions around where this will be a severe problem.

I haven't seen a fix for it yet.

> Is KVM a supported "hardware" platform i Debian? I would expect so. If
> it is, then please raise the severity of this bug high enough to reflect
> this.

Yes, it's supported. Indeed we often use it to test new kernel builds.

Ben.

--
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.
 
Old 07-12-2010, 12:15 PM
Bjørn Mork
 
Default Bug#588426: linux-image-2.6.32-5-amd64: fail to boot in a kvm virtual machine

Ben Hutchings <ben@decadent.org.uk> writes:
> On Mon, 2010-07-12 at 10:22 +0200, Bjørn Mork wrote:
>
>> But I must admit that I was a bit surprised when 2.6.32-17 was uploaded
>> without a fix for this problem. It makes me wonder if the severity
>> shouldn't have been higher after all.... Just to be clear: This bug
>> does break all KVM based systems, making them completely unbootable, and
>> requiring console access to fix. I'm pretty sure there are plenty of
>> KVM based hosting solutions around where this will be a severe problem.
>
> I haven't seen a fix for it yet.

Ah, sorry, I thought the fix was clear from the bug report:

Peter Palfrader has bisected it down to commit 1345126c
"x86, paravirt: Add a global synchronization point for pvclock"
which sounds very reasonable, IMHO. See
http://lkml.indiana.edu/hypermail/linux/kernel/1007.0/02385.html

To be absolutely sure this is correct, I just built a kernel based on
your 2.6.32-17 with commit 1345126c reverted, and that does indeed boot
under KVM. The revert patch is attached. Please try it.

I do hope this goes into next 2.6.32-stable as well, although the
discussion following Peter Palfrader's bisect seems a bit discouraging.
"that patch shouldn't affect anything outside..." Right. Well, it
does. So please revert it in stable.


Thanks,
Bjørn
 
Old 07-14-2010, 04:17 PM
Sheldon Hearn
 
Default Bug#588426: linux-image-2.6.32-5-amd64: fail to boot in a kvm virtual machine

Affects i686 as well.

Ciao,
Sheldon.




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Old 07-18-2010, 05:15 PM
Timo Juhani Lindfors
 
Default Bug#588426: linux-image-2.6.32-5-amd64: fail to boot in a kvm virtual machine

This should probably be merged with #588509?





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