linux-ext4 - [Bug 12579] ext4 filesystem hang

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Message-Id: <20090212152406.C59BC108041@picon.linux-foundation.org>
Date:	Thu, 12 Feb 2009 07:24:06 -0800 (PST)
From:	bugme-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 12579] ext4 filesystem hang

http://bugzilla.kernel.org/show_bug.cgi?id=12579


sandeen@...hat.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Regression|0                           |1




------- Comment #1 from sandeen@...hat.com  2009-02-12 07:24 -------
Finally had some time, and I've tracked this down to the page-writeback.c
changes since .28 - backing them all out the testcase runs overnight.  Still
working out which one and why.  I suppose it's still possible it's an ext4 bug
but if so the page-writeback.c changes exposed it.

It's a classic deadlock; I usually have 2 threads stuck, pdflush vs. the livecd
creator doing an fsync.  Each is waiting for a page the other has locked.

-Eric


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