From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from magic.merlins.org ([209.81.13.136]:45562 "EHLO mail1.merlins.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751938AbaDGQFH (ORCPT ); Mon, 7 Apr 2014 12:05:07 -0400 Received: from merlin by mail1.merlins.org with local (Exim 4.80 #2) id 1WXC2k-0006Lc-MM for ; Mon, 07 Apr 2014 09:05:06 -0700 Date: Mon, 7 Apr 2014 09:05:06 -0700 From: Marc MERLIN To: linux-btrfs@vger.kernel.org Subject: btrfs on 3.14rc5 stuck on "btrfs_tree_read_lock sync" Message-ID: <20140407160506.GG10789@merlins.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-btrfs-owner@vger.kernel.org List-ID: I was debugging my why backup failed to run, and eventually found it was stuck on sync: 14080 18:18 btrfs_tree_read_lock sync This was hung for hours on this lock. Strangely, it looks like taking my sysrq-w hung the machine pretty hard for close to 30sec, but this seems to have unhung sync and in the end btrfs send completed after that. Sysqrq-w is here: http://marc.merlins.org/tmp/sysrq-btrfs-sync-hang.txt 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/