linux-ext4 - [Bug 14256] kernel BUG at fs/ext3/super.c:435

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Date:	Tue, 19 Jan 2010 19:56:43 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14256] kernel BUG at fs/ext3/super.c:435

http://bugzilla.kernel.org/show_bug.cgi?id=14256


Jan Kara <jack@...e.cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dvhltc@...ibm.com




--- Comment #26 from Jan Kara <jack@...e.cz>  2010-01-19 19:56:41 ---
OK, I've spent some time looking into this. It's definitely a futex problem -
futexes take reference to inode and apparently this test case takes some code
path where we don't drop all the inode references we have acquired. I've tried
to find that place by looking into the code but wasn't successful.

I think the problem is caused by futex rewrite that happened between 2.6.30 and
2.6.31 so I'm adding Darren to CC (who was author of most of the patches).
Darren, I'm able to reproduce the problem with 2.6.33-rc3 kernel so apparently
the problem isn't fixed yet. I'll attach here a minimal test program that
triggers the problem.

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