linux-ext4 - Re: xfstests generic/130 hang with non-4k block size ext4 on 4.7-rc1 kernel

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Message-ID: <20160609150405.GB19882@quack2.suse.cz>
Date:	Thu, 9 Jun 2016 17:04:05 +0200
From:	Jan Kara <jack@...e.cz>
To:	Nikola Pajkovsky <nikola.pajkovsky@...ddata.com>
Cc:	Holger Hoffstätte 
	<holger@...lied-asynchrony.com>, linux-ext4@...r.kernel.org,
	Jan Kara <jack@...e.com>
Subject: Re: xfstests generic/130 hang with non-4k block size ext4 on 4.7-rc1
 kernel

On Thu 09-06-16 09:23:29, Nikola Pajkovsky wrote:
> Holger Hoffstätte <holger@...lied-asynchrony.com> writes:
> 
> > On Wed, 08 Jun 2016 14:56:31 +0200, Jan Kara wrote:
> > (snip)
> >> Attached patch fixes the issue for me. I'll submit it once a full xfstests
> >> run finishes for it (which may take a while as our server room is currently
> >> moving to a different place).
> >> 
> >> 								Honza
> >> -- 
> >> Jan Kara <jack@...e.com>
> >> SUSE Labs, CR
> >> From 3a120841a5d9a6c42bf196389467e9e663cf1cf8 Mon Sep 17 00:00:00 2001
> >> From: Jan Kara <jack@...e.cz>
> >> Date: Wed, 8 Jun 2016 10:01:45 +0200
> >> Subject: [PATCH] ext4: Fix deadlock during page writeback
> >> 
> >> Commit 06bd3c36a733 (ext4: fix data exposure after a crash) uncovered a
> >> deadlock in ext4_writepages() which was previously much harder to hit.
> >> After this commit xfstest generic/130 reproduces the deadlock on small
> >> filesystems.
> >
> > Since you marked this for -stable, just a heads-up that the previous patch
> > for the data exposure was rejected from -stable (see [1]) because it
> > has the mismatching "!IS_NOQUOTA(inode) &&" line, which didn't exist
> > until 4.6. I removed it locally but Greg probably wants an official patch.
> >
> > So both this and the previous patch need to be submitted.
> >
> > [1] http://permalink.gmane.org/gmane.linux.kernel.stable/18074{4,5,6}
> 
> I'm just wondering if the Jan's patch is not related to blocked
> processes in following trace. It very hard to hit it and I don't have
> any reproducer.

This looks like a different issue. Does the machine recover itself or is it
a hard hang and you have to press a reset button?

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR
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