On Fri, Jul 18, 2008 at 08:44:58AM -0700, Ben Greear wrote:Our problem is the refcount hang while trying to remove a netdevice. It appears
Dave Chinner wrote:
Folks,We have been chasing a refcount bug in 2.6.25 that only happens when
I just deadlocked networking on a 2.6.24 kernel. Basically I
was trying to restart the bridge interface I use for UML sessions
because it wasn't passing packets. This happens occasionally
when I leave a UML session too long in gdb, so I bounced the
bridge to get it working again.
IPv6 module is loaded.
Which causes what problem? The deadlock I reported or the bridge occasionally
hanging? Is that a problem in 2.6.24?
The deadlock is the one I'm concerned about - it appears that
netdev_run_todo() can only wait on a single interface at a time,
so if we are tearing down two interfaces concurrently where one
has a reference on the other a deadlock is just waiting to happen...