linux-ext4 - [Bug 75881] lazyinit failure on new mdadm raid5 & encrypted array

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Message-ID: <bug-75881-13602-IjaLGhcsR3@https.bugzilla.kernel.org/>
Date:	Sun, 11 May 2014 19:05:54 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 75881] lazyinit failure on new mdadm raid5 & encrypted array

https://bugzilla.kernel.org/show_bug.cgi?id=75881

Theodore Tso <tytso@....edu> changed:

           What    |Removed                     |Added
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                 CC|                            |tytso@....edu

--- Comment #1 from Theodore Tso <tytso@....edu> ---
Is this something you can reliably reproduce?  The log doesn't tell us anything
useful, and it's not clear whether the problem is with the dm-crypt (i.e.,
LUKS) layer, or with the ext4 layer.   All the log tells us is that we are
waiting forever for a block I/O operation to finish in the jbd2 commit thread,
and this is causing the lazyinit thread to give a soft lockup warning (meaning
that two minutes has gone by without any forward progress taking place).

I suspect the problem is in an interaction between the dm-crypt and md raid5
code, which is being tickled by the I/O patterns that you've described.  But
before we kick this over to the the device mapper developers, the first
question is whether you can reliably reproduce the problem.

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