Re: domU crash with kernel BUG at drivers/net/xen-netfront.c:305

[Vasily Evseenko <svpcom@gmail.com>]

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Hi,
There are no clear steps to reproduce.
Bug triggered only by high tcp network load (webserver pattern - many
small connections) every one - two days.
See xen, dom0 and domU's info in attachment. I can provide any
additional info.
I've tried dom0/domU kernels 3.10.23 (vanilla, from centos-xen) and
3.10.25,  xen 4.2.3 and 4.3.1.

On 12/27/2013 03:53 PM, Wei Liu wrote:
> On Fri, Dec 27, 2013 at 03:09:17PM +0400, Vasily Evseenko wrote:
>> Hi,
>>
>> I've got domU crash (~ every 1-2 days under high network (tcp) load)
>> with message:
>>
> Do you have clear steps on how to reproduce this issue?
>
>> domU's are under high TCP load (a lot of small tcp connections (web server))
>> sometimes  i've got on dom0:
>> ---
>> [2013-12-26 00:16:30] (XEN) grant_table.c:289:d0 Increased maptrack size
>> to 2 frames
>> [2013-12-26 03:53:18] (XEN) grant_table.c:1858:d0 Bad grant reference
>> 99221507
>> [2013-12-26 03:53:18] (XEN) grant_table.c:1858:d0 Bad grant reference
>> 43646979
>> [2013-12-26 03:53:18] (XEN) grant_table.c:1858:d0 Bad grant reference
>> 43646979
>> [2013-12-26 03:53:18] (XEN) grant_table.c:1858:d0 Bad grant reference
>> 99221507
>> [2013-12-26 06:15:14] (XEN) grant_table.c:1858:d0 Bad grant reference
>> 43646979
>> [2013-12-26 06:15:14] (XEN) grant_table.c:1858:d0 Bad grant reference
>> 99221507
>> [2013-12-26 06:15:14] (XEN) grant_table.c:1858:d0 Bad grant reference
>> 99221507
>> [2013-12-26 06:15:14] (XEN) grant_table.c:1858:d0 Bad grant reference
>> 99221507
>>
> Grant reference this big doesn't look right. Frontend is passing garbage
> to backend. Given that the numbers showed above have certain pattern
> there might be a bug in frontend somewhere.
>
>> ---
>>
>> It seems the root of problem in dom0 messages above. Is it HW failure or
>> some internal kernel structures overflow?
>>
> It's not hardware failure, more likely to be overflow. In order to fix
> this you need to provide more info on your workload, software setup etc.
>
> Wei.
>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xen.org
>> http://lists.xen.org/xen-devel


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