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From devnull@lkml.org Wed May 8 06:08:23 2024 Delivery-date: Wed, 27 May 2009 07:50:09 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759341AbZE0FtX (ORCPT ); Wed, 27 May 2009 01:49:23 -0400 Received: from smtp-102-tuesday.noc.nerim.net ([62.4.17.102]:61502 "EHLO mallaury.nerim.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752219AbZE0FtV (ORCPT ); Wed, 27 May 2009 01:49:21 -0400 Received: from brouette (damien.wyart.pck.nerim.net [213.41.244.197]) by mallaury.nerim.net (Postfix) with ESMTP id 639F5A1062; Wed, 27 May 2009 07:49:21 +0200 (CEST) Received: by brouette (Postfix, from userid 1000) id 9ED6545F11; Wed, 27 May 2009 07:49:21 +0200 (CEST) Date: Wed, 27 May 2009 07:49:21 +0200 From: Damien Wyart To: Jens Axboe Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, chris.mason@oracle.com, david@fromorbit.com, hch@infradead.org, akpm@linux-foundation.org, jack@suse.cz, yanmin_zhang@linux.intel.com, richard@rsk.demon.co.uk Subject: Re: [PATCH 0/12] Per-bdi writeback flusher threads v7 Message-Id: <20090527054921.GA4127@localhost.localdomain> References: <1243330430-9964-1-git-send-email-jens.axboe@oracle.com> <20090526152501.GA20968@localhost.localdomain> <20090526164117.GJ11363@kernel.dk> <20090526170845.GA3226@localhost.localdomain> <20090526204703.GM11363@kernel.dk> <20090526211119.GO11363@kernel.dk> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="AhhlLboLdkugWU4S" Content-Disposition: inline In-Reply-To: <20090527052101.GA28517@localhost.localdomain> User-Agent: Mutt/1.5.19 (2009-05-25) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-Id: X-Mailing-List: linux-kernel@vger.kernel.org --AhhlLboLdkugWU4S Content-Type: text/plain; charset=us-ascii Content-Disposition: inline > > > OK, I spotted the problem. If we fallback to the on-stack allocation in > > > bdi_writeback_all(), then we do the wait for the work completion with > > > the bdi_lock mutex held. This can deadlock with bdi_forker_task(), so if > > > we require that to be invoked to make progress (happens if a thread > > > needs to be restarted), then we have a deadlock on that mutex. > > > I'll cook up a fix for this, but probably not before the morning. > > Untested fix. I think it should work, but I haven't run it here yet. > Thanks for your feedback and explanations. Will not be able to test the > patch before the afternoon. Will then give feedback as soon as I can. Of > course, I can also test a new fix or series if you send one in the > morning, after your own testing. Just ran a quick test with your fix applied and ran into the same problem: manual sync stays in D state. I could capture SysRq-T, I am attaching part of the output (which was very big and continuously displaying). Hope this helps, -- Damien Wyart --AhhlLboLdkugWU4S Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: attachment; filename="sysrq_t.gz" Content-Transfer-Encoding: quoted-printable =1F=8B=08=08#=D4=1CJ=00=03sysrq_t=00=ED]Is+9r=BE=FBW=F0>=D1=D1=D8=0B=D5=E1= =B0=0F=F6uN=E3=83#&&*PX$=86=B8=0DI=BD=C5=BF=DEH=00=B5=89=A4=94=D5C=F6[=BAt= =D0=AB'=12=89=A5=90_~=99=00=12=7F5_W=ACZ=91=EA7!=7Fcd=D5=1E=F7=AF=FE|=F6=AB= =17=7F=DC=F9=CDo=AB=FF2=9B=CD=EA=7F=8E=C6=FA=DF=FE=ED=AF=1F}y=F5=F7=7F=B7= =84=F3PI=F5=1F=FFX=FD=E7=EAd=9F=BD{=DD=F8=BF=90/=F2W=F2=85r=BC=08=1F=E4DD= =F3|<=AF=B7~=FFzn=8Ef=F7=04"9=8D2=BDD=CA=A4=84=13=9B=9Be=0Ek=DB=80=B4c=B3= =DE=9D=FD=F1=F8z8Gy=CCDy=9C`=E5)=CF-I=F2=0E=FB=CD=A6=E9=1BZ=9A =02=15=08=F4= x=81=AA4=D0=ED=9B=D3=D7S=03rA=8C=AE@=0E=A5hA=81=D8: j=92=8C=CFf=0D=CD!QJ=ED= =F0B=A8R}=F7>=9B=17_DHv[=C4=C6=9C=CE=AB=AD?=9D=CC=93_=1D=FD=C1=9B=B3w+=B1= =8219ak=8E=F5=8A<=B0qH=EDKs8z=BF=3D=9C=1Bh=C3=EB!=B6=A2u=B1=19.=A0=E5=D5=81= =E7=9E=9C=8F_=9B=F3> 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