From: Justin Maggard Subject: System hang with EXT4 Date: Mon, 23 Nov 2009 18:16:06 -0800 Message-ID: <150c16850911231816t514bb1dds4deb541b14a5bad6@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 To: ext4 development Return-path: Received: from mail-px0-f204.google.com ([209.85.216.204]:49833 "EHLO mail-px0-f204.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752241AbZKXCP7 (ORCPT ); Mon, 23 Nov 2009 21:15:59 -0500 Received: by pxi42 with SMTP id 42so3770308pxi.5 for ; Mon, 23 Nov 2009 18:16:06 -0800 (PST) Sender: linux-ext4-owner@vger.kernel.org List-ID: 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