linux-kernel - Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.

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

Message-ID: <1304091436.2559.8.camel@mulgrave.site>
Date:	Fri, 29 Apr 2011 10:37:16 -0500
From:	James Bottomley <James.Bottomley@...e.de>
To:	sedat.dilek@...il.com
Cc:	Chris Mason <chris.mason@...cle.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback
 related.

On Fri, 2011-04-29 at 12:23 +0200, Sedat Dilek wrote:
> But as I see these RCU (CPU) stalls, the patch from [1] might be worth a try.
> First, I have seen negative effects on my UP-system was when playing
> with linux-next [2].
> It was not clear what the origin was and the the side-effects were
> somehow "bizarre".
> The issue could be easily reproduced by tar-ing the kernel build-dir
> to an external USB-hdd.
> The issue kept RCU and TIP folks really busy.
> Before stepping 4 weeks in the dark, give it a try and let me know in
> case of success.

Well, it's highly unlikely because that's a 2.6.39 artifact and the bug
showed up in 2.6.38 ... I tried it just in case with no effect, so we
know it isn't the cause.

> For the systemd/cgroups part of the discussion (yes, I followed this
> thread in parallel):
> The patch from [4] might be interesting (untested here).

What makes you think that?  This patch is about rcu problems in cgroup
manipulation through the mounted cgroup control filesystems.  The bug in
question manifests when all of that is quiescent, so it's not likely to
be related.

James


--
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/