From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12579] ext4 filesystem hang
Date: Thu, 12 Feb 2009 10:48:52 -0800 (PST)
Message-ID: <20090212184852.E347B108043@picon.linux-foundation.org>
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------- Comment #4 from tytso@mit.edu 2009-02-12 10:48 -------
>> 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.
>
> Two commits which are already in the mainline which fixed some changes
> after .28 are
>
> 89e1219004b3657cc014521663eeef0744f1c99d
> dcf6a79dda5cc2a2bec183e50d829030c0972aaa
>
I read Eric's email as saying he tracked it down to the
page-writeback.c changes *after* 2.6.28. Eric, is that what you
meant?
- Ted
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