From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Lehmann Subject: Re: 100% system time hang with git f2fs Date: Fri, 2 Oct 2015 10:53:40 +0200 Message-ID: <20151002085340.GA3105@schmorp.de> References: <01bf01d0f777$45df5ee0$d19e1ca0$@samsung.com> <20150926032218.GA4311@schmorp.de> <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> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1Zhw68-0001Eg-AY for linux-f2fs-devel@lists.sourceforge.net; Fri, 02 Oct 2015 08:53:48 +0000 Received: from mail.nethype.de ([5.9.56.24]) by sog-mx-3.v43.ch3.sourceforge.com with esmtps (TLSv1:AES128-SHA:128) (Exim 4.76) id 1Zhw66-00022W-Se for linux-f2fs-devel@lists.sourceforge.net; Fri, 02 Oct 2015 08:53:48 +0000 Received: from [10.0.0.5] (helo=doom.schmorp.de) by mail.nethype.de with esmtp (Exim 4.84) (envelope-from ) id 1Zhw60-0000ix-JR for linux-f2fs-devel@lists.sourceforge.net; Fri, 02 Oct 2015 08:53:40 +0000 Received: from [10.0.0.1] (helo=cerebro.laendle) by doom.schmorp.de with esmtp (Exim 4.84) (envelope-from ) id 1Zhw60-0002gJ-Eh for linux-f2fs-devel@lists.sourceforge.net; Fri, 02 Oct 2015 08:53:40 +0000 Received: from root by cerebro.laendle with local (Exim 4.84) (envelope-from ) id 1Zhw60-0000oh-E5 for linux-f2fs-devel@lists.sourceforge.net; Fri, 02 Oct 2015 10:53:40 +0200 Content-Disposition: inline In-Reply-To: <20151001185124.GA9803@schmorp.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: linux-f2fs-devel@lists.sourceforge.net On Thu, Oct 01, 2015 at 08:51:24PM +0200, Marc Lehmann wrote: > Ok, for completeness, here is the full log and a description of what was > going on. Ok, so I did a fsck, which took one hour, which is not very good, but I don't use fsck very often. It didn't find any problems (everything Ok). However, I have a freeze. When I mount the volume, start a du on it, and after a while do: echo 3 >/proc/sys/vm/drop_caches Then this process hangs with 100% sys time. /proc/../stack gives no usable backtrace. umount on the f2fs volume also hangs: [] call_rwsem_down_write_failed+0x13/0x20 [] unregister_shrinker+0x1d/0x70 [] deactivate_locked_super+0x41/0x60 [] deactivate_super+0x4e/0x70 [] cleanup_mnt+0x43/0x90 [] __cleanup_mnt+0x12/0x20 [] task_work_run+0xc4/0xe0 [] do_notify_resume+0x97/0xb0 [] int_signal+0x12/0x17 [] 0xffffffffffffffff -- The choice of a Deliantra, the free code+content MORPG -----==- _GNU_ http://www.deliantra.net ----==-- _ generation ---==---(_)__ __ ____ __ Marc Lehmann --==---/ / _ \/ // /\ \/ / schmorp@schmorp.de -=====/_/_//_/\_,_/ /_/\_\ ------------------------------------------------------------------------------