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Re: [Xen-users] kernel BUG at /usr/src/linux-stable/drivers/net/xen-netback/netback.c:540!

On 12/19/2014 11:06 AM, Ian Campbell wrote:
On Thu, 2014-12-18 at 22:36 +0100, Hans de Bruin wrote:
On 12/17/2014 11:06 PM, Hans de Bruin wrote:

I just opgraded my test-host and guest to 3.14.27. Which probable was
not a good idea. A nfsroot guest triggers a kernel BUG in the host when
is starts its mediatomb deamon. Before the upgrade the host and guest
were running 3.14.23:

After some testing it looks like the guest is to blame, It does not
matter if the host is running .23 or .27, but if the guest boots .27 the
BUG happens and always when mediatomb is starting.

The above is after start-up of the host and the first boot of the guest.
When a .23 guest is successfully started, it can be shut down and
restarted with a .27 kernel.

Is there anything I should test or check before I start mailing to the

Please check later kernels for netback fixes, I have a feeling this
issue was fixed but I don't recall the details.

I choose 3.14 because its is the latest long term stable. the .27 has a xen-netfront fix (http://lwn.net/Articles/626580/):

Seth Forshee (1):
      xen-netfront: Remove BUGs on paged skb data which crosses
      a page boundary

It could have broken my upgrade (along with all the other fixes since .23). I will try 3.17.7. The 3.18 series have a bisected bug that spontaneously unmount my nfs-volumes.


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