From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vc0-f179.google.com ([209.85.220.179]:44726 "EHLO mail-vc0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751139AbaF0Bh3 (ORCPT ); Thu, 26 Jun 2014 21:37:29 -0400 Received: by mail-vc0-f179.google.com with SMTP id id10so4366532vcb.24 for ; Thu, 26 Jun 2014 18:37:28 -0700 (PDT) MIME-Version: 1.0 Date: Thu, 26 Jun 2014 21:37:27 -0400 Message-ID: Subject: Blocked tasks on 3.15.1 From: Rich Freeman To: linux-btrfs@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: I've been getting blocked tasks on 3.15.1 generally at times when the filesystem is somewhat busy (such as doing a backup via scp/clonezilla writing to the disk). A week ago I had enabled snapper for a day which resulted in a daily cleanup of about 8 snapshots at once, which might have contributed, but I've been limping along since. Here is a pastebin of my dmesg from the hung tasks and a subsequent Alt-SysRq-W: http://pastebin.com/yYdcxFTE When this happens the system remains somewhat stable, but no writes to the disk succeed, and I start getting load averages in the dozens as tasks start blocking. On reboot the system generally works fine, though it can hang a day or two later. I'm happy to try patches, or try to capture any other output that is helpful the next time this happens - the system is fairly stable as long as I capture things someplace other than my btrfs file systems. I didn't see anything quite like this on the list. I updated my kernel around the time this behavior started, and was on 3.15.0 previously (though I haven't tried reverting yet). Rich