Re: [Xen-devel] xen 4.3 test report (another bug)

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, May 31, 2013 at 03:07:00PM +0400, Vasiliy Tolstov wrote:
> 2013/5/31 Wei Liu <wei.liu2@xxxxxxxxxx>:
> > If you didn't have more DomU up and running, this looks like a leak
> > somewhere.
> >
> 
> on this node i'm only have 3 domains with bad network. all other 30
> domains work's fine.
> 
> >> (XEN) mm.c:1695:d0 Bad L1 flags 400000
> >>
> >
> > And this... I have now idea at the moment.
> >
> >
> > And I would also need your Dom0 configuration, dmesg log in Dom0.
> 
> Bingo. On another server with this kernel and xen i have:
> 
> [131872.141036] vif vif-139-0 vif139.0: Too many frags
> [131872.141042] vif139.0: fatal error; disabling device
> 
> What from dom0 configuration i need to provide?
> 

Ah, this is a known issue. MAX_SKB_FRAGS in DomU is larger than the one
in Dom0, Dom0 thinks the packet is malicious and disconnect the vif.
Patches have been upstreamed to fix this, but the backporting to 3.8 is
not kicked off.

If you don't bother applying patches and rebuilding your kernel, you can
probably want until the backport happens.

If you cannot wait, look for email sent by Ian Campbell with title:
"xen-netback stable backports request (regression fixes)".


Wei.

> --
> Vasiliy Tolstov,
> e-mail: v.tolstov@xxxxxxxxx
> jabber: vase@xxxxxxxxx

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