linux-kernel - Re: [RESEND] [BUG] futex_unlock_pi() hurts my brain and may cause application deadlock

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Message-Id: <20070731.184119.41636411.davem@davemloft.net>
Date:	Tue, 31 Jul 2007 18:41:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	johnstul@...ibm.com
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	rostedt@...dmis.org, sripathik@...ibm.com
Subject: Re: [RESEND] [BUG] futex_unlock_pi() hurts my brain and may cause
 application deadlock

From: john stultz <johnstul@...ibm.com>
Date: Tue, 31 Jul 2007 16:53:39 -0700

> 	I sent this fix for this back in the 2.6.21-rt9 era, and I thought to
> picked it up, but I think it arrived amid some futex churn and
> apparently has been dropped or was just lost.
> 
> Some of our testers have been reporting futex deadlocks and this fix
> resolves it, so I believe it to still be needed.

This bug seems to exist in mainline too.

Sparc users have been seeing something that smells like this
bug, I will ask them to test this fix out.
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