Kernel paging request error

Kernel paging request error

[Sławek Kosowski]

Reposting from xen-users (no response)
I'm having a problem with: http://pastebin.com/CuGHqwhy
It occurs on the reboot, but sometimes, when I try to start manually one of
my machines. Sometime, one of the machines does not want to start
permanently and I have to reinstall/restore it.
This problem comes for me randomly, but maybe there is a trigger. 
I've tried to follow:
http://xen.1045712.n5.nabble.com/2-6-32-27-dom0-BUG-unable-to-handle-kernel-paging-request-td3323011.html
and raise /proc/sys/vm/min_free_kbytes, but it did not help.

System info:
Debian, Linux dom0 3.2.0-0.bpo.3-amd64
i libxenstore3.0 4.0.1-5.4 
Xenstore communications library for Xen
ii xen-hypervisor-4.0-amd64 4.0.1-5.4 The
Xen Hypervisor on AMD64
ii xen-linux-system-3.2.0-0.bpo.3-amd64 3.2.23-1~bpo60+2 Xen
system with Linux 3.2 on 64-bit PCs (meta-package)
ii xen-linux-system-amd64 3.2+45~bpo60+1 Xen
system with Linux for 64-bit PCs (meta-package)
ii xen-tools 4.2-1 Tools
to manage Xen virtual servers
ii xen-utils-4.0 4.0.1-5.4 XEN
administrative tools
ii xen-utils-common 4.0.0-1 XEN
administrative tools - common files
ii xenstore-utils 4.0.1-5.4 
Xenstore utilities for Xen
ii xenwatch 0.5.4-2 
Virtualization utilities, mostly for Xen


Any advices how to solve ?
Can it be a hardware problem with RAM ?

Regards
Slawek

Re: Kernel paging request error

[Jan Beulich]

>>> On 23.10.12 at 20:44, Sławek Kosowski<slawek.k_xl@wp.pl> wrote:
> Reposting from xen-users (no response)
> I'm having a problem with: http://pastebin.com/CuGHqwhy 
> It occurs on the reboot, but sometimes, when I try to start manually one of
> my machines. Sometime, one of the machines does not want to start
> permanently and I have to reinstall/restore it.
> This problem comes for me randomly, but maybe there is a trigger. 

Please look for earlier posts of similar problems (and their resolution)
before posting here.

> I've tried to follow:
> http://xen.1045712.n5.nabble.com/2-6-32-27-dom0-BUG-unable-to-handle-kernel-paging-requ 
> est-td3323011.html
> and raise /proc/sys/vm/min_free_kbytes, but it did not help.

Just picking some random "unable to handle kernel paging request"
report doesn't help; xsave-related issues (caused by a bogus
kernel side patch in certain distros) have been discussed quite
recently here.

Jan

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: Kernel paging request error

[Ian Campbell]

On Tue, 2012-10-23 at 19:44 +0100, Sławek Kosowski wrote:
> Reposting from xen-users (no response)
> I'm having a problem with: http://pastebin.com/CuGHqwhy
> It occurs on the reboot, but sometimes, when I try to start manually one of
> my machines. Sometime, one of the machines does not want to start
> permanently and I have to reinstall/restore it.

One experiment to try, based on Debian bug #642154 would be to try
"noxsave" and/or "noxsaveopt" on your kernel command line. Please try
each independently and both together.

I thought this sort of thing was ironed out before 3.2. Since you are
running a bpo kernel you could also consider running a backport of Xen
4.1 from Wheezy as well.

> This problem comes for me randomly, but maybe there is a trigger. 
> I've tried to follow:
> http://xen.1045712.n5.nabble.com/2-6-32-27-dom0-BUG-unable-to-handle-kernel-paging-request-td3323011.html
> and raise /proc/sys/vm/min_free_kbytes, but it did not help.

That is a completely unrelated problem, "BUG unable to handle kernel
paging request" is a very generic error message which is common to loads
of different potential issues.

[...]

Ian.


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: Kernel paging request error

[Sławek Kosowski]

Thank you, now I don't have any errors after reboot, we'll see how it will be in the future.

Regards
Slawek

> On Tue, 2012-10-23 at 19:44 +0100, Sławek Kosowski wrote:
> > Reposting from xen-users (no response)
> > I'm having a problem with: http://pastebin.com/CuGHqwhy
> > It occurs on the reboot, but sometimes, when I try to start manually one 
> of
> > my machines. Sometime, one of the machines does not want to start
> > permanently and I have to reinstall/restore it.
> 
> One experiment to try, based on Debian bug #642154 would be to try
> "noxsave" and/or "noxsaveopt" on your kernel command line. Please try
> each independently and both together.
> 
> I thought this sort of thing was ironed out before 3.2. Since you are
> running a bpo kernel you could also consider running a backport of Xen
> 4.1 from Wheezy as well.
> 
> > This problem comes for me randomly, but maybe there is a trigger.
> > I've tried to follow:
> > http://xen.1045712.n5.nabble.com/2-6-32-27-dom0-BUG-unable-to-handle-kernel-paging-request-td3323011.html
> > and raise /proc/sys/vm/min_free_kbytes, but it did not help.
> 
> That is a completely unrelated problem, "BUG unable to handle kernel
> paging request" is a very generic error message which is common to loads
> of different potential issues.
> 
> [...]
> 
> Ian.