[Bug 42829] KVM Guest with virtio network driver loses network connectivity

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=42829





--- Comment #5 from Steve <stefan.bosak@gmail.com>  2012-03-01 23:04:37 ---
Results of my test:
===================

In all test cases host configuration is the same:
-------------------------------------------------
kernel: latest 3.3-rc5+
compiler: gcc (4.7.0-pre9999 20120225 rev. 184573)
glibc-2.14.1-r2
bridge-utils-1.5
iproute2-3.1.0
ethtool-3.2

other system stuff: all latest from their git repos
util-linux, net-tools, kmod, udev, seabios, qemu-kvm

In all test cases guest configuration except kernel is the same:
----------------------------------------------------------------
compiler: gcc 4.6.2
glibc-2.14.1-r2
iproute2-3.1.0
ethtool-3.2

other system stuff: all latest from their git repos
util-linux, net-tools, kmod, udev


1) guest kernel =v2.6.39
   - works fine more than 5min
2) guest kernel =v3.0
   - virtio network goes down in less then 1min of test
3) guest kernel latest v3.3-rc5+
   - virtio network goes down in less then 1min of test


I continue with tracking in kernel tags after v2.6.39:

4) guest kernel =v3.0-rc1
   - works fine more than 5min

5) guest kernel =v3.0-rc5
   - virtio network goes down in less then 1min of test

6) guest kernel =v3.0-rc3
   - works fine more than 5min

I shortly look at =v3.0-rc5, problem could be somewhere in this tag.

Later I would like to locate problematic commit
with git bisecting and after I report my results.

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