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Date: Sat, 19 Jul 2008 10:01:35 -0700 From: Ben Greear <greearb@...delatech.com> To: Ben Greear <greearb@...delatech.com>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: [BUG, NET] deadlock tearing down a bridged interface Dave Chinner wrote: > On Fri, Jul 18, 2008 at 08:44:58AM -0700, Ben Greear wrote: > >> Dave Chinner wrote: >> >>> Folks, >>> >>> 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. >>> >>> >> We have been chasing a refcount bug in 2.6.25 that only happens when >> 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... > Our problem is the refcount hang while trying to remove a netdevice. It appears to be an ipv6 related leakage of some sort, and not directly related to bridges. Thanks, Ben -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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