Re: BUG at drivers/xen/balloon.c:353

[David Vrabel <david.vrabel@citrix.com>]

On 10/09/13 17:12, Ian Jackson wrote:
> Now that we are on Linux 3.4.y, I am once again trying to commission
> my pair of weevils.  Things are better than they were but it's still
> totally broken.
> 
> Below you can see the logs from my adhoc osstest flight 19169.  I
> looked at one of the save/restore failures (test-amd64-i386-xl) and
> see this:
> 
> Sep 10 00:03:09.073066 [  240.142970] kernel BUG at drivers/xen/balloon.c:353!
> 
> I'd appreciate any help available with debugging this.  The logs are
> here:
> 
>   http://www.chiark.greenend.org.uk/~xensrcts/logs/19169/test-amd64-i386-xl/info.html
> 
> I looked at the code in balloon.c:
> 
> 		BUG_ON(!xen_feature(XENFEAT_auto_translated_physmap) &&
> 		       phys_to_machine_mapping_valid(pfn));
> 
> Ian.
> 
> Sep 10 00:03:08.629133 [  240.142955] ------------[ cut here ]------------
> Sep 10 00:03:09.073066 [  240.142970] kernel BUG at drivers/xen/balloon.c:353!
> Sep 10 00:03:09.073102 [  240.142974] invalid opcode: 0000 [#1] SMP 
> Sep 10 00:03:09.081064 [  240.142978] Modules linked in: xen_acpi_processor xen_gntalloc ext4 jbd2 mbcache e1000e
> Sep 10 00:03:09.093059 [  240.142987] CPU: 6 PID: 847 Comm: kworker/6:1 Not tainted 3.11.0+ #1

There's a know bug in this area with 3.11+ (3.12-rc0) and there is
pending pull request for the fix.

I am a bit confused by the reference to 3.4.y above.  Is this BUG in a
guest running 3.11+ on a host with 3.4.y as dom0?  Or have you
accidentally installed 3.11+ as your dom0 kernel?

David