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

From Tejun Heo <tj@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing MQ IO
Date 2016-04-25 18:10 +0200
Message-ID <rrRfd-hZ-35@gated-at.bofh.it> (permalink)
References <rrQCw-89O-45@gated-at.bofh.it> <rrQVP-8hY-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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

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Thread

[PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing MQ IO Roman Pen <roman.penyaev@profitbricks.com> - 2016-04-25 17:30 +0200
  Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Tejun Heo <tj@kernel.org> - 2016-04-25 17:50 +0200
    Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Tejun Heo <tj@kernel.org> - 2016-04-25 18:10 +0200
      Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Roman Penyaev <roman.penyaev@profitbricks.com> - 2016-04-25 18:50 +0200
    Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Roman Penyaev <roman.penyaev@profitbricks.com> - 2016-04-25 18:40 +0200
      Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Tejun Heo <tj@kernel.org> - 2016-04-25 19:10 +0200
        Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Roman Penyaev <roman.penyaev@profitbricks.com> - 2016-04-25 19:50 +0200
          Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Tejun Heo <tj@kernel.org> - 2016-04-25 20:00 +0200
    Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Peter Hurley <peter@hurleysoftware.com> - 2016-04-26 03:30 +0200
      Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Tejun Heo <tj@kernel.org> - 2016-04-26 17:20 +0200
        Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Peter Hurley <peter@hurleysoftware.com> - 2016-04-26 19:30 +0200
          Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Tejun Heo <tj@kernel.org> - 2016-04-26 19:50 +0200
            Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Peter Hurley <peter@hurleysoftware.com> - 2016-04-26 22:10 +0200
            Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Hannes Reinecke <hare@suse.de> - 2016-04-27 08:00 +0200
              Re: [PATCH 1/1] [RFC] workqueue: fix ghost PENDING flag while doing  MQ IO Tejun Heo <tj@kernel.org> - 2016-04-27 21:10 +0200

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