linux-kernel - Re: [PATCH] debug workqueue flushing deadlocks with lockdep

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <1183626201.7054.56.camel@twins>
Date:	Thu, 05 Jul 2007 11:03:21 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Oleg Nesterov <oleg@...sign.ru>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Sattler <tsattler@....de>
Subject: Re: [PATCH] debug workqueue flushing deadlocks with lockdep

On Wed, 2007-07-04 at 21:34 +0200, Johannes Berg wrote:
> This patch adds a fake lock to each workqueue in order to debug things
> where you have something like
> 
>   my_function() -> lock(); ...; flush_workqueue(); ...
> vs
>   run_workqueue() -> my_work() -> ...; lock(); ...
> 
> which can obviously deadlock if my_work is scheduled when my_function()
> is invoked (but hasn't locked yet.)
> 
> Signed-off-by: Johannes Berg <johannes@...solutions.net>

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/