linux-kernel - Re: [PATCH 1/1] x86, ticketlock: spin_unlock

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Message-ID: <20141201220929.GA7305@redhat.com>
Date:	Mon, 1 Dec 2014 23:09:29 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"Paul E.McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Waiman Long <Waiman.Long@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] x86, ticketlock: spin_unlock_wait() can livelock

On 12/01, Linus Torvalds wrote:
>
> Can you point to the report that you
> think this might be the cause of?

Please look at https://bugzilla.redhat.com/show_bug.cgi?id=1128995

but let me repeat, so far this is just my speculation. Plus this is
the old rhel6 kernel.

Oleg.

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