Pkg xen devel - Jun 2011 - Bug#631102: xen: Xen guests on Squeeze lose networking randomly

Package: xen-hypervisor-4.0-amd64
Version: 4.0.1-2
Severity: grave
File: xen
Justification: renders package unusable


Debian Squeeze Dom0, up to date.

Networking is handled by OS scripts, such that br0 and br1 are bridge
interfaces.

Without warning, the DomU (Ubuntu 10.04 LTS) loses inbound connectivity.  It
tends to happen after several hours.  It doesn't seem to be affected by
throughput and is triggering on very small ammounts (5MB in and out over that
time).  Having active traffic doesn't help, it still dies.

Updated the DomU to kernel 2.6.35 with no change.  I suspect the problem lies on
the Dom0 side.

It's possible to "revive" the DomU for a short while by getting a
console with xm on Dom0 and then sending pings to the Dom0 and other hosts.

-- System Information:
Debian Release: 6.0.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-xen-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

xen-hypervisor-4.0-amd64 depends on no packages.

Versions of packages xen-hypervisor-4.0-amd64 recommends:
ii  xen-utils-4.0                 4.0.1-2    XEN administrative tools

Versions of packages xen-hypervisor-4.0-amd64 suggests:
pn  xen-docs-4.0                  <none>     (no description available)

-- no debconf information

On 06/20/2011 05:50 PM, Kevin Bowling wrote:
> Debian Squeeze Dom0, up to date.
> 
> Networking is handled by OS scripts, such that br0 and br1 are bridge
interfaces.
> 
> Without warning, the DomU (Ubuntu 10.04 LTS) loses inbound connectivity. 
It tends to happen after several hours.  It doesn't seem to be affected by
throughput and is triggering on very small ammounts (5MB in and out over that
time).  Having active traffic doesn't help, it still dies.
> 
> Updated the DomU to kernel 2.6.35 with no change.  I suspect the problem
lies on the Dom0 side.
> 
> It's possible to "revive" the DomU for a short while by
getting a console with xm on Dom0 and then sending pings to the Dom0 and other
hosts.
My guess is that what's happening isn't what you say. It might well be
due to your switch forgetting about the MAC address of your domU, if
there's no network activity on it (at least that's my guess, and it did
happen as well with Lenny and Debian as domU). I had the issue in many
data centers/switches, and I wrote a small python script to fix it in a
cron job. I have attached the script to this email.

As you can see, this script looks into /etc/xen/auto. So make sure that
you have symlink to configuration files in that folder.

Cheers,

Thomas
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severity 631102 important
tags 631102 moreinfo
thanks

On Mon, Jun 20, 2011 at 05:50:30AM -0400, Kevin Bowling
wrote:
> Without warning, the DomU (Ubuntu 10.04 LTS) loses inbound connectivity. 
It tends to happen after several hours.  It doesn't seem to be affected by
throughput and is triggering on very small ammounts (5MB in and out over that
time).  Having active traffic doesn't help, it still dies.
Does this happen with Debian Squeeze? Support for Ubuntu is not here.
> Updated the DomU to kernel 2.6.35 with no change.  I suspect the problem
lies on the Dom0 side.
.35 is way to old. Update to .39 from Debian unstable if you want to
proof something.

Bastian

-- 
Vulcans believe peace should not depend on force.
		-- Amanda, "Journey to Babel", stardate 3842.3

Your message dated Mon, 10 Dec 2012 00:24:02 +0100
with message-id <50C51D92.7040409 at mendix.com>
and subject line Re: #631102 and #679533.. related?
has caused the Debian Bug report #631102,
regarding xen: Xen guests on Squeeze lose networking randomly
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner at bugs.debian.org
immediately.)


-- 
631102: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=631102
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
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