netdev - Re: panic 2.6.27-rc3-git2, qdisc_dequeue

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Message-ID: <20080817103141.GC2907@ami.dom.local>
Date:	Sun, 17 Aug 2008 12:31:41 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
Cc:	netdev@...r.kernel.org
Subject: Re: panic 2.6.27-rc3-git2, qdisc_dequeue_head

On Sun, Aug 17, 2008 at 01:01:55PM +0300, Denys Fedoryshchenko wrote:
> Ok, now things finally organized.
> fixing patch #1 was missing.
> 
> Rebooting system to this kernel. But strange thing, without fixing patch #1 it 
> didn't crash for whole night, and 1-3 hours now (with same options as 
> before).

The fixing patch #1 was intended to fix only one issue shown in the
warnings: qdisc_watchdog scheduled leaf qdiscs for qdisc_run(), so
they were dequeued directly (skipping root qdiscs) and with wrong
locks.

The fixing patch #2 changes qdisc locking generally, so it probably
fixed other locking issues btw. like this last oops seen after the
patch #1. But still there is this (not critical) issue of skipping
root qdiscs while dequeuing after qdisc_watchdog, which has to be done
by the fixing patch #1.

Jarek P.
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