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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] net: deadlock during net device unregistration
Date: Tue, 30 Sep 2008 06:58:52 -0700 (PDT)
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From: Benjamin Thery <benjamin.thery@bull.net>
Date: Tue, 30 Sep 2008 13:52:31 +0200

> BTW, in the past (last year) dst_gc_task() was run as a timer
> handler and this situation (deadlock with linkwatch_event())
> couldn't occur.

September 12th to be exact :-)  That's when Eric Dumazet's
change went in:

commit 86bba269d08f0c545ae76c90b56727f65d62d57f
Author: Eric Dumazet <dada1@cosmosbay.com>
Date:   Wed Sep 12 14:29:01 2007 +0200

    [PATCH] NET : convert IP route cache garbage collection from softirq processing to a workqueue


But this change went into 2.6.24, so I wonder why it's taken
so long to hit this.