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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

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.

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