From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [PATCH 0/4] locks: flock and lease related bugfixes, and remove
 i_flctx counters
Date: Tue, 17 Feb 2015 20:20:49 +0000
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Cc: Jeff Layton <jeff.layton@primarydata.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
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	Christoph Hellwig <hch@lst.de>,
	Dave Chinner <david@fromorbit.com>,
	Sasha Levin <sasha.levin@oracle.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
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On Tue, Feb 17, 2015 at 11:55:01AM -0800, Linus Torvalds wrote:

> Can we get that truncated series tested with some flock test suite? I
> assume there is *some* filesystem tester that tests some basic flock
> stuff, even if it clearly didn't catch the race due to the unlock in
> the middle..

LTP runltp -f syscalls does cover some of that; BTW, looks like fcntl11,
fcntl11_64, fcntl21 and fcntl21_64 in there got broken by something already
merged.  Hadn't don bisect yet, but seeing
 * NAME
 *      fcntl11.c
 *
 * DESCRIPTION
 *      Testcase to check locking of regions of a file
 *
 * ALGORITHM  
 *      Test changing lock sections around a write lock
and
 * NAME
 *      fcntl21.c
 *
 * DESCRIPTION
 *      Check locking of regions of a file
 *
 * ALGORITHM
 *      Test changing lock sections around a read lock

I'd say that file locking merge is most likely suspect...