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  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 21 Mar 2014 08:17:06 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Pavel Shilovsky <piastry@...rsoft.ru>
Cc:	Jeff Layton <jlayton@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-cifs <linux-cifs@...r.kernel.org>,
	Steve French <sfrench@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <williams@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, uobergfe@...hat.com
Subject: Re: [RFC PATCH] cifs: Fix possible deadlock with cifs and work
 queues

On Fri, 21 Mar 2014 12:32:12 +0400
Pavel Shilovsky <piastry@...rsoft.ru> wrote:


> Read and write codepaths both obtain lock_sem for read and then wait
> for cifsiod_wq to complete and release lock_sem. They don't do any
> lock_sem operations inside their work task queued to cifsiod_wq. But
> oplock code can obtain/release lock_sem in its work task. So, that's
> why I agree with Jeff and suggest to move the oplock code to a
> different work queue (cifsioopd_wq?) but leave read and write
> codepaths use cifsiod_wq.

OK, how about I submit a second patch that moves the reader and writer
to its own "safe" workqueue?

-- Steve

--
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/

Powered by blists - more mailing lists