From: Dmitry Monakhov Subject: Re: System hang with EXT4 Date: Fri, 11 Dec 2009 04:29:48 +0300 Message-ID: <87fx7ixppv.fsf@openvz.org> References: <150c16850911231816t514bb1dds4deb541b14a5bad6@mail.gmail.com> <20091208151816.GB3141@atrey.karlin.mff.cuni.cz> <150c16850912091723x7659bf4ke42f209595ceb147@mail.gmail.com> <150c16850912101541k5293b3d7l947b5850fed707b1@mail.gmail.com> <150c16850912101543q231fb703u130c9e646289a8fe@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: ext4 development To: Justin Maggard Return-path: Received: from mail.2ka.mipt.ru ([194.85.80.4]:50811 "EHLO mail.2ka.mipt.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762161AbZLKB3g convert rfc822-to-8bit (ORCPT ); Thu, 10 Dec 2009 20:29:36 -0500 Received: from dmon-lp ([unknown] [10.55.93.124]) by mail.2ka.mipt.ru (Sun Java(tm) System Messaging Server 7u2-7.02 64bit (built Apr 16 2009)) with ESMTPA id <0KUG00A13SDFNE30@mail.2ka.mipt.ru> for linux-ext4@vger.kernel.org; Fri, 11 Dec 2009 04:34:30 +0300 (MSK) In-reply-to: <150c16850912101543q231fb703u130c9e646289a8fe@mail.gmail.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Justin Maggard writes: > On Wed, Dec 9, 2009 at 5:23 PM, Justin Maggard = wrote: >> On Tue, Dec 8, 2009 at 7:18 AM, Jan Kara wrote: >>> =C2=A0Can you still switch consoles after the system hangs (it's go= od 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 picture= s of >>> as many screens as possible using console scrollback)? Thanks. >> >> Thanks for the response. =C2=A0Console scrollback doesn't seem to wo= rk for >> me in that mode. =C2=A0I tried it three times. =C2=A0Two of the time= s the list >> was empty. =C2=A0The other time, the screen just listed a bunch of r= m >> processes. > > I have a little more information to add. =C2=A0After noticing the rec= ent > "Fix potential quota deadlock" patch on the mailing list, I figured i= t > would be worth a shot to try it without quotas enabled. =C2=A0This al= so > avoids the system hang. =C2=A0I tried applying that patch, but still = had > the same symptoms using that kernel. =C2=A0So I'm seeing a consistent > system hang with ext4 when delalloc and quotas are enabled on an SMP > system. =C2=A0With either quotas or delalloc disabled, it doesn't han= g. > Both enabled on a single processor system also doesn't hang. You also may try another patch "[PATCH] ext4: fix sleep inside spinlock issue aka #14739 V2" > > -Justin > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4"= in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html