From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: writeback hang in current mainline Date: Wed, 26 May 2010 15:44:57 +0200 Message-ID: <20100526134457.GQ23411@kernel.dk> References: <20100526111326.GA28541@lst.de> <20100526112125.GJ23411@kernel.dk> <20100526114018.GA30107@lst.de> <20100526114950.GK23411@kernel.dk> <20100526120855.GA30912@lst.de> <20100526122126.GL23411@kernel.dk> <20100526124549.GA32550@lst.de> <20100526125614.GM23411@kernel.dk> <20100526134208.GA2557@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org To: Christoph Hellwig Return-path: Received: from 0122700014.0.fullrate.dk ([95.166.99.235]:56305 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753888Ab0EZNo6 (ORCPT ); Wed, 26 May 2010 09:44:58 -0400 Content-Disposition: inline In-Reply-To: <20100526134208.GA2557@lst.de> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Wed, May 26 2010, Christoph Hellwig wrote: > On Wed, May 26, 2010 at 02:56:15PM +0200, Jens Axboe wrote: > > On Wed, May 26 2010, Christoph Hellwig wrote: > > > On Wed, May 26, 2010 at 02:21:26PM +0200, Jens Axboe wrote: > > > > Ugh ok I see it, I had the caller_frees reverted. Try this :-) > > > > > > This seems to fix it. Running some more tests now. > > > > Goodie, then the analysis at least is correct. A potentially cleaner fix > > would be to just allocate the WB_SYNC_NONE && sb_pinned work struct on > > the stack, since then we can get rid of that nastiness in > > wb_work_complete() as well (and not pass 'sb_pinned' around so much). > > > > If you have time, care to test this one as well? > > Both this and the previous one hang hard in xfstests 007, with no chance > of getting a backtrace. > > For now I would recommend to revert > 21c12849fef73efc9a898b6702fe421fd774f515 and > 29c795f02e68ecd7bb1374844d3e55e882ac158f, > which makes xfstests run fine for me. OK, thanks for the testing. I'll revert the two and work up a real solution once I have the test equipment online again. -- Jens Axboe