linux-ext4 - Re: System hang with EXT4

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Message-ID: <20091208151816.GB3141@atrey.karlin.mff.cuni.cz>
Date:	Tue, 8 Dec 2009 16:18:16 +0100
From:	Jan Kara <jack@...e.cz>
To:	Justin Maggard <jmaggard10@...il.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: System hang with EXT4

  Hi,

> I've recently run into an issue with ext4 and delayed allocation where
> my system will silently hang just seconds into a dbench run.  I first
> saw this using 2.6.30.9, but it still happens with 2.6.32-rc8.  I've
> tried with an SMP x86_64 system, and a UP i386 system.  The SMP x86_64
> system hangs every time for me within 15 seconds, but the UP i386
> system never hangs on me.  If I remount with -o nodelalloc on the SMP
> system, the hang goes away.  There are no messages printed out by the
> kernel; it just locks hard.  Has anyone seen this before?  I'm just
> running "dbench 500" to produce this behavior.
  Can you still switch consoles after the system hangs (it's good to
debug this on a text console)? If yes, could you press Alt-Sysrq-w and
take a picture of the console by digital camera or so (take pictures of
as many screens as possible using console scrollback)? Thanks.

								Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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