linux-kernel - Re: Tasks stuck in futex code (in 3.14-rc6)

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Message-ID: <20140320100848.GC10406@linux.vnet.ibm.com>
Date:	Thu, 20 Mar 2014 15:38:48 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	torvalds@...ux-foundation.org, LKML <linux-kernel@...r.kernel.org>,
	paulus@...ba.org, tglx@...utronix.de,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, mingo@...nel.org
Subject: Re: Tasks stuck in futex code (in 3.14-rc6)

> This problem suggests that we missed a wakeup for a task that was adding
> itself to the queue in a wait path. And the only place that can happen
> is with the hb spinlock check for any pending waiters. Just in case we
> missed some assumption about checking the hash bucket spinlock as a way
> of detecting any waiters (powerpc?), could you revert this commit and
> try the original atomic operations variant:
> 
> https://lkml.org/lkml/2013/12/19/630

I think the above url and the commit id that I reverted i.e
git://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b0c29f79ecea0b6fbcefc999
are the same.

Or am I missing something? 

-- 
Thanks and Regards
Srikar Dronamraju

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