linux-ext4 - System hang with EXT4

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Date:	Mon, 23 Nov 2009 18:16:06 -0800
From:	Justin Maggard <jmaggard10@...il.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: System hang with EXT4

Hi all,

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.

-Justin
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