linux-ext4 - Re: RT/ext4/jbd2 circular dependency

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]

Date:	Thu, 13 Nov 2014 20:06:44 +0100
From:	Jan Kara <jack@...e.cz>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Chris Friesen <chris.friesen@...driver.com>,
	Austin Schuh <austin@...oton-tech.com>, pavel@...linux.ru,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-ext4@...r.kernel.org, adilger.kernel@...ger.ca,
	rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: RT/ext4/jbd2 circular dependency

On Thu 30-10-14 19:24:37, Ted Tso wrote:
> On Thu, Oct 30, 2014 at 10:11:26PM +0100, Thomas Gleixner wrote:
> > 
> > That's a way better explanation than what I saw in the commit logs and
> > it actually maps to the observed traces and stackdumps.
> 
> I can't speak for Jan, but I suspect he didn't realize that there was
> a problem.  The commit description in b34090e5e2 makes it clear that
> the intent was a performance improvement, and not an attempt to fix a
> potential deadlock bug.
  Yeah, correct. When I wrote b34090e5e2 I did that because I have realized
that journal reservations would create similar deadlock opportunity as
Chris has observed. I hadn't realized the problem is already in the code :)

								Honza

-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html