linux-ext4 - [Bug 44731] ext4 deadlock under heavy io?

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Message-Id: <20120713140640.313E311FAD0@bugzilla.kernel.org>
Date:	Fri, 13 Jul 2012 14:06:40 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 44731] ext4 deadlock under heavy io?

https://bugzilla.kernel.org/show_bug.cgi?id=44731


Mirek Rusin <mirek@...com> changed:

           What    |Removed                     |Added
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                 CC|                            |mirek@...com




--- Comment #1 from Mirek Rusin <mirek@...com>  2012-07-13 14:06:39 ---
Some additional information:

- this hang situation happens very rarely, I'd say maybe every 10TBytes of data
written (at 1Gbit/sec).
- there are maximum of 32 threads doing io.
- each io operation is at most 0.5MB of data (written or read) per syscall with
an exception of fallocate, which can be rarely large, ie. 60GB.
- this situation happens on both empty volumes (where fallocate can find
continuous blocks to do any requested fallocate) and, what seems more often,
when disk is close to being full.
- the volume is LSI RAID6 with 500MB cache and 24x 2TB hard drives
- i'm able to do several hundred of ios per second normally, the hang seems to
be caused by the kernel itself and not hardware
- during the hang i can access and write to the volume from other
processes/threads.

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