linux-kernel - alpha: futex regression bisected

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Message-ID: <4F420256.2090600@orcon.net.nz>
Date:	Mon, 20 Feb 2012 21:20:38 +1300
From:	Michael Cree <mcree@...on.net.nz>
To:	Michel Lespinasse <walken@...gle.com>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>
CC:	linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
	Matt Turner <mattst88@...il.com>
Subject: alpha: futex regression bisected

I have noticed some user space problems (pulseaudio crashes in pthread
code, glibc/nptl test suite failures, java compiler freezes on SMP alpha
systems) that arise when using a 2.6.39 or later kernel on Alpha.
Bisecting between 2.6.38 and 2.6.39 (using glibc/nptl test suite as
criterion for good/bad kernel) eventually leads to:

8d7718aa082aaf30a0b4989e1f04858952f941bc is the first bad commit
commit 8d7718aa082aaf30a0b4989e1f04858952f941bc
Author: Michel Lespinasse <walken@...gle.com>
Date:   Thu Mar 10 18:50:58 2011 -0800

    futex: Sanitize futex ops argument types

    Change futex_atomic_op_inuser and futex_atomic_cmpxchg_inatomic
    prototypes to use u32 types for the futex as this is the data type the
    futex core code uses all over the place.

Looking at the commit I see there is a change of the uaddr argument in
the Alpha architecture specific code for futexes from int to u32, but I
don't see why this should cause a problem.

I am hoping someone better than I at Alpha assembly (Richard?, Ivan?)
might be able to look at the commit and propose a fix!

Cheers
Michael.
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