From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Lehmann Subject: Re: 100% system time hang with git f2fs Date: Sat, 3 Oct 2015 08:29:09 +0200 Message-ID: <20151003062909.GA2318@schmorp.de> References: <20150926052551.GA2243@schmorp.de> <20150926075253.GD13619@jaegeuk-mac02.hsd1.ca.comcast.net> <20150926135957.GB9860@schmorp.de> <20150928175944.GA16945@jaegeuk-mac02.mot.com> <20150929110204.GA7608@schmorp.de> <20150929231310.GA6010@jaegeuk-mac02.mot.com> <20151001121120.GA7340@schmorp.de> <20151001185124.GA9803@schmorp.de> <20151002085340.GA3105@schmorp.de> <20151002165124.GA2586@jaegeuk-mac02> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1ZiGJq-0005Ge-TD for linux-f2fs-devel@lists.sourceforge.net; Sat, 03 Oct 2015 06:29:18 +0000 Received: from mail.nethype.de ([5.9.56.24]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:AES128-SHA:128) (Exim 4.76) id 1ZiGJp-0006JF-6m for linux-f2fs-devel@lists.sourceforge.net; Sat, 03 Oct 2015 06:29:18 +0000 Content-Disposition: inline In-Reply-To: <20151002165124.GA2586@jaegeuk-mac02> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: Jaegeuk Kim Cc: linux-f2fs-devel@lists.sourceforge.net On Fri, Oct 02, 2015 at 09:51:24AM -0700, Jaegeuk Kim wrote: > > However, I have a freeze. When I mount the volume, start a du on it, and after > > a while do: > > How was your scenario? > Did you delete device before, or just plain mount and umount? After writing >2TB to it, I let it idle/gc for a while, then unmounted. Then did a fsck and mount, and let it idle for the night. On the next day, I did a du for a speed test, relaised I hadn't dropped the caches, interrupted the du, and then trie drop_caches with the result. > This should be shrinker is stuck on mutex. I suspect a deadlock. > Can you do this, if you meet this again? Will do. Btw, I already mentioned that /proc/*/stack didn't give a useful backtrace. Since it was apparently running, I thought maybe run cat /.../stack in a loop, and indeed, after a minute, I got one backtrace out of it (the process doing the echo): http://ue.tst.eu/2562aec1c51d4bad3d7b8b83380956a7.txt Maybe that is already useful? It indeed mentions the shrinker. (I did this after my mail, so didn't include it). -- The choice of a Deliantra, the free code+content MORPG -----==- _GNU_ http://www.deliantra.net ----==-- _ generation ---==---(_)__ __ ____ __ Marc Lehmann --==---/ / _ \/ // /\ \/ / schmorp@schmorp.de -=====/_/_//_/\_,_/ /_/\_\ ------------------------------------------------------------------------------