From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaegeuk Kim Subject: Re: 100% system time hang with git f2fs Date: Fri, 2 Oct 2015 09:51:24 -0700 Message-ID: <20151002165124.GA2586@jaegeuk-mac02> References: <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> <20151002085340.GA3105@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-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1Zi3YS-0004qD-3u for linux-f2fs-devel@lists.sourceforge.net; Fri, 02 Oct 2015 16:51:32 +0000 Received: from mail.kernel.org ([198.145.29.136]) by sog-mx-3.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1Zi3YR-0007BO-6w for linux-f2fs-devel@lists.sourceforge.net; Fri, 02 Oct 2015 16:51:32 +0000 Content-Disposition: inline In-Reply-To: <20151002085340.GA3105@schmorp.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: Marc Lehmann Cc: linux-f2fs-devel@lists.sourceforge.net On Fri, Oct 02, 2015 at 10:53:40AM +0200, Marc Lehmann wrote: > 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: How was your scenario? Did you delete device before, or just plain mount and umount? > echo 3 >/proc/sys/vm/drop_caches > > Then this process hangs with 100% sys time. /proc/../stack gives no usable > backtrace. This should be shrinker is stuck on mutex. I suspect a deadlock. Can you do this, if you meet this again? # echo l > /proc/sysrq-trigger # echo w > /proc/sysrq-trigger # demsg Thanks, > > 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 > -=====/_/_//_/\_,_/ /_/\_\ > > ------------------------------------------------------------------------------ > _______________________________________________ > Linux-f2fs-devel mailing list > Linux-f2fs-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel ------------------------------------------------------------------------------