linux-kernel - Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing MQ IO

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Message-ID: <20160425160023.GA7822@mtj.duckdns.org>
Date:	Mon, 25 Apr 2016 12:00:23 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Roman Pen <roman.penyaev@...fitbricks.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing
 MQ IO

On Mon, Apr 25, 2016 at 11:48:47AM -0400, Tejun Heo wrote:
> Heh, excellent debugging.  I wonder how old this bug is.  cc'ing David

I just went through the history.  So, we used to have clear_bit()
instead of atomic_long_set() but clear_bit() doesn't imply any barrier
either, so kudos to you.  You just debugged an issue which is most
likely has been there for over a decade! :)

-- 
tejun