2010-08-19 19:04:05

by Patrick McLean

[permalink] [raw]
Subject: [Bug #16572][REGRESSION, bisected] random panics in bridging on 2.6.34+

Hi,

I am getting random panics with KVM/bridging on 2.6.34+ (including
latest git as of this morning).

There is a screenshot of the panic message in bugzilla at
https://bugzilla.kernel.org/show_bug.cgi?id=16572

It seems to happen when I have KVM virtual machines running with
bridging mode, most often when any of the virtual machines talk to the
network, or sometimes when they are brought up or down.

I bisected it down to this commit:

commit 68b7c895be336b19f4c38d7cb500132fabba0afd
Author: Herbert Xu <[email protected]>
Date: Sat Feb 27 19:41:40 2010 +0000

bridge: Allow tail-call on br_pass_frame_up

This patch allows tail-call on the call to br_pass_frame_up
in br_handle_frame_finish. This is now possible because of the
previous patch to call br_pass_frame_up last.

Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>