From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:2194 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751064AbaEWUV6 (ORCPT ); Fri, 23 May 2014 16:21:58 -0400 Message-ID: <537FAE91.20308@fb.com> Date: Fri, 23 May 2014 16:24:49 -0400 From: Chris Mason MIME-Version: 1.0 To: Marc MERLIN , Duncan <1i5t5.duncan@cox.net> CC: , Subject: Re: 3.15.0-rc5: now sync and mount are hung on call_rwsem_down_write_failed References: <20140522090921.GA12037@merlins.org> <20140522131528.GB22952@merlins.org> <20140523002243.GE12312@merlins.org> <20140523141722.GA11991@merlins.org> In-Reply-To: <20140523141722.GA11991@merlins.org> Content-Type: text/plain; charset="ISO-8859-1" Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 05/23/2014 10:17 AM, Marc MERLIN wrote: > 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. Hi Marc, Can I have the sysrq-w from this one if it's still available? -chris