From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cc-smtpout1.netcologne.de ([89.1.8.211]:47701 "EHLO cc-smtpout1.netcologne.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1948894AbcBSQAN (ORCPT ); Fri, 19 Feb 2016 11:00:13 -0500 Subject: Re: task btrfs-cleaner:770 blocked for more than 120 seconds. To: bo.li.liu@oracle.com References: <20160211191741.GA4762@localhost.localdomain> <20160212032226.GA10542@localhost.localdomain> <20160212203426.GA24399@localhost.localdomain> <20160214213224.GB28882@localhost.localdomain> <20160215034219.2f0df0ce@natsu> <56C5BA8C.1020106@netcologne.de> <20160218165943.GB2492@localhost.localdomain> Cc: Btrfs BTRFS From: Christian Rohmann Message-ID: <56C73C09.3080207@netcologne.de> Date: Fri, 19 Feb 2016 17:00:09 +0100 MIME-Version: 1.0 In-Reply-To: <20160218165943.GB2492@localhost.localdomain> Content-Type: text/plain; charset=windows-1252 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hey liubo, thanks for the quick response. On 02/18/2016 05:59 PM, Liu Bo wrote: >> Apparently also with 4.4 there is some sort of blocking happening ... >> > just at 38580: > OK, what does 'sysrq-w' say? The problem has not appeared again for some time. Do I need to catch it right when it happens? If so, what evidence should I collect and how? Regards Christian