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[Xen-bugs] [Bug 100] New: Bridge dies with > 1 domU using it

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Subject: [Xen-bugs] [Bug 100] New: Bridge dies with > 1 domU using it
From: sean@xxxxxxxxx
Date: Wed, 13 Jul 2005 10:56:26 +0000
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           Summary: Bridge dies with > 1 domU using it
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux-2.6
            Status: NEW
          Severity: major
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: sean@xxxxxxxxx

My setup (duplicated on 2 machines, 1 is 2x700 PIII other is 1x800PIII)

Dom0 base OS: Mandriva 10.2
Xen Source  : latest unstable from 2005 07 10
Vmtools     : latest cvs from yesterday
Xen Kernel  : default built from Xen Hg tree (no modifications beyond that)
Networking  : bridged on interface br0, br0 has staticly assigned ip
                (Mandriva provides a nice set of scripts to setup bridging which
                defaults to br0, so I used that.)
DomU Networking : all domU dhcp to get their IP addresses

Bringing up the first DomU works as expected, ip address assigned, routing
all works.

Bringing up the second DomU has the effect of *killing* the bridge.  Dom1's
network interface no longer works, sshing to br0 interface no longer works,
Dom2 never gets an IP via dhcp (although the broadcast packets *are* seen on
the DHCP server).

This looks like it also does the same thing under XenD, though it doesn't
seem to kill the br0 outright, just all the vifs stop working.

I've left these machines up for a number of days (laziness) and networking only
gets worse after that.  After a day or so the second interface card in the
machines (which I was using as an administrative lan) also just entirely stops
responding to traffic.  I can 100% reproduce this problem, so please let me know
any other information that would be good to have and I can add it.

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