Re: [Xen-devel] [Xen-users] kernel 3.9.2 - xen 4.2.2/4.3rc1 => BUG unable to handle kernel paging request netif_poll+0x49c/0xe8

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.07.13 at 15:43, Dion Kant <g.w.kant@xxxxxxxxxx> wrote:
> Hello Wei and all other interested people,
> 
> I saw this thread from around May. It got silent on this thread after
> your post on May 31.
> 
> Is there any progress on this problem?

We didn't receive feedback on the effect of the debugging patch
Wei had posted on that day
(http://lists.xenproject.org/archives/html/xen-devel/2013-05/msg03138.html).

Without knowing whether the possible issue pointed out earlier in
the thread is an actual one, or whether we need to look for
something else, we can't really make any progress here.

> I spent already quite some time in getting grip on the issue. I added a
> bug to bugzilla.novell.com but no response. See
> https://bugzilla.novell.com/show_bug.cgi?id=826374 for details.
> Apparently for hitting this bug (i.e. make it all the way to the crash),
> it is required to use some hardware which performs not too slow. With
> this I mean it is easy to find hardware which is unable to reproduce the
> issue.

You having picked the wrong component (Kernel instead of Xen)
may be part of the problem.

> 2013-07-03T23:51:16.560229+02:00 domUA kernel: [   97.562370] netfront:
> Too many frags

The fix for this is already in the queue (and half of it already
committed at least to our master branch). But this isn't necessarily
connected to the crash/corruption you observe (but I do think that
crash and corruption are just two different manifestations of the
same problem).

Jan


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