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Date:	Fri, 13 Jul 2012 14:06:40 +0000 (UTC)
Subject: [Bug 44731] ext4 deadlock under heavy io?

Mirek Rusin <> changed:

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--- Comment #1 from Mirek Rusin <>  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

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