netdev - Re: [PATCH] net: deadlock during net device unregistration

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Message-ID: <48E232AF.7060501@bull.net>
Date:	Tue, 30 Sep 2008 16:07:43 +0200
From:	Benjamin Thery <benjamin.thery@...l.net>
To:	David Miller <davem@...emloft.net>
Cc:	jarkao2@...il.com, netdev@...r.kernel.org, dlezcano@...ibm.com,
	dada1@...mobay.com
Subject: Re: [PATCH] net: deadlock during net device unregistration

David Miller wrote:
> From: Benjamin Thery <benjamin.thery@...l.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@...mosbay.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.

Maybe because we manage to reproduce it only with network namespaces so
far and there isn't much netns users at the moment (and netns is still
incomplete in mainline).

Benjamin

> 
> 


-- 
B e n j a m i n   T h e r y  - BULL/DT/Open Software R&D

    http://www.bull.com
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