linux-kernel - [BUG 4.1.11] EXT4-fs error: ext4_xattr_block_get:299

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Date:	Tue, 19 Apr 2016 16:38:15 +0200
From:	Philipp Hahn <hahn@...vention.de>
To:	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>
Cc:	Jens Thorp-Hansen <thorp-hansen@...vention.de>,
	Stefan Gohmann <gohmann@...vention.de>
Subject: [BUG 4.1.11] EXT4-fs error: ext4_xattr_block_get:299 - Remounting
 filesystem read-only

Hello,

we have a virtual machine running linxu-4.1.11 on VMware ESX. After
swapping hard disks on the host the VM mounted its root file system
read-only two times now after detecting some file system corruption.

I hopefully collected enough data from the system, which I attach to
this mail.

Looking at the ACL block I don't see the EXT4_XATTR_MAGIC.
But I see the string  signature of two EAs ("posix_acl" and
"DOSATTRIB"), so block 14221335 seems to be a corrupted ACL block.

We recently observed several other problems related to EAs, so here for
reference:

* With 3.16 we had on corruption on KVM. I re-checked
<https://bugzilla.kernel.org/show_bug.cgi?id=102731>, which is fixed
since v3.17-rc1~141^2~79, so this is a different bug.
And here we're running on VMware.

* With 4.1.11 we observed samba hanging due to many different EAs:
<https://bugzilla.kernel.org/show_bug.cgi?id=107301>-
Here smbd doesn't get stuck, but the fs gets mounted read-only.

* There is
<http://lkml.iu.edu/hypermail/linux/kernel/1603.2/01585.html>, which has
"ext4_xattr_block_get" in it, but is with 4.5.

Any ideas?

Philipp

PS: I'm subscribed to LKML but not to ext4.
-- 
Philipp Hahn
Open Source Software Engineer

Univention GmbH
be open.
Mary-Somerville-Str. 1
D-28359 Bremen
Tel.: +49 421 22232-0
Fax : +49 421 22232-99
hahn@...vention.de

http://www.univention.de/
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