From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from magic.merlins.org ([209.81.13.136]:36246 "EHLO mail1.merlins.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751113AbaEWORX (ORCPT ); Fri, 23 May 2014 10:17:23 -0400 Date: Fri, 23 May 2014 07:17:22 -0700 From: Marc MERLIN To: Duncan <1i5t5.duncan@cox.net> Cc: linux-btrfs@vger.kernel.org, takeuchi_satoru@jp.fujitsu.com Subject: Re: 3.15.0-rc5: now sync and mount are hung on call_rwsem_down_write_failed Message-ID: <20140523141722.GA11991@merlins.org> References: <20140522090921.GA12037@merlins.org> <20140522131528.GB22952@merlins.org> <20140523002243.GE12312@merlins.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20140523002243.GE12312@merlins.org> Sender: linux-btrfs-owner@vger.kernel.org List-ID: I had btrfs send/receive running. Plugging the power in caused laptop-mode to remount my root partition. That hung, and in turn all of btrfs hung too. 7668 root btrfs send home_ro.20140523 - 7669 root btrfs receive /mnt/btrfs_po sleep_on_page 12118 root mount /dev/mapper/cryptroot call_rwsem_down_write_failed 10678 merlin mencoder -passlogfile dsc04 sleep_on_page Clearly, it takes very little for 3.15rc5 to deadlock :( (I wasn't running balance or snapshot this time) I was able to kill btrfs send and receive, but mencoder is very hung, and sync does not finish either: 10654 merlin sync sync_inodes_sb 17191 merlin sync call_rwsem_down_read_failed I'm not posting the sysrq-w every time, but I have it available if needed. Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/