From: Jan Kara Subject: Re: xfstests generic/130 hang with non-4k block size ext4 on 4.7-rc1 kernel Date: Fri, 3 Jun 2016 13:58:44 +0200 Message-ID: <20160603115844.GB2470@quack2.suse.cz> References: <20160531140922.GM5140@eguan.usersys.redhat.com> <20160531154017.GC5357@thunk.org> <20160601063822.GH10350@eguan.usersys.redhat.com> <20160601165800.GI10350@eguan.usersys.redhat.com> <20160602085840.GH19636@quack2.suse.cz> <20160602121750.GC32574@quack2.suse.cz> <20160603101612.GJ10350@eguan.usersys.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jan Kara , Theodore Ts'o , Eryu Guan , linux-ext4@vger.kernel.org To: Eryu Guan Return-path: Received: from mx2.suse.de ([195.135.220.15]:33642 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751727AbcFCL6r (ORCPT ); Fri, 3 Jun 2016 07:58:47 -0400 Content-Disposition: inline In-Reply-To: <20160603101612.GJ10350@eguan.usersys.redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Fri 03-06-16 18:16:12, Eryu Guan wrote: > On Thu, Jun 02, 2016 at 02:17:50PM +0200, Jan Kara wrote: > > > > So I was trying but I could not reproduce the hang either. Can you find out > > which page is jbd2 thread waiting for and dump page->index, page->flags and > > also bh->b_state, bh->b_blocknr of all 4 buffer heads attached to it via > > page->private? Maybe that will shed some light... > > I'm using crash on live system when the hang happens, so I got the page > address from "bt -f" > > #6 [ffff880212343b40] wait_on_page_bit at ffffffff8119009e > ffff880212343b48: ffffea0002c23600 000000000000000d > ffff880212343b58: 0000000000000000 0000000000000000 > ffff880212343b68: ffff880213251480 ffffffff810cd000 > ffff880212343b78: ffff88021ff27218 ffff88021ff27218 > ffff880212343b88: 00000000c1b4a75a ffff880212343c68 > ffff880212343b98: ffffffff811901bf Thanks for debugging! In the end I was able to reproduce the issue on my UML instance as well and I'm debugging what's going on. Honza -- Jan Kara SUSE Labs, CR