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Re: Freezable workqueue blocks non-freezable workqueue during the system resume process

From Tejun Heo <tj@kernel.org>
Newsgroups linux.kernel
Subject Re: Freezable workqueue blocks non-freezable workqueue during the system resume process
Date 2016-02-25 23:10 +0100
Message-ID <r6cgG-1Uy-13@gated-at.bofh.it> (permalink)
References <r5bPH-7KL-1@gated-at.bofh.it> <r5nea-7n1-21@gated-at.bofh.it> <r5C3w-16C-11@gated-at.bofh.it>
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Hello, Peter.

On Wed, Feb 24, 2016 at 03:24:30PM +0800, Peter Chen wrote:
> > You might want to complain to the block-layer people about this.  I 
> > don't know if anything can be done to fix it.
> > 
> > Or maybe flush_work and flush_delayed_work can be changed to avoid 
> > blocking if the workqueue is frozen.  Tejun?
> > 
> 
> I have a patch to show the root cause of this issue.
> 
> http://www.spinics.net/lists/linux-usb/msg136815.html

I don't get it.  Why would it deadlock?  Shouldn't things get rolling
once the workqueues are thawed?

Thanks.

-- 
tejun

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Thread

Freezable workqueue blocks non-freezable workqueue during the system  resume process Peter Chen <hzpeterchen@gmail.com> - 2016-02-23 04:30 +0100
  Re: Freezable workqueue blocks non-freezable workqueue during the  system resume process Peter Chen <hzpeterchen@gmail.com> - 2016-02-23 11:00 +0100
  Re: Freezable workqueue blocks non-freezable workqueue during the  system resume process Alan Stern <stern@rowland.harvard.edu> - 2016-02-23 16:40 +0100
    Re: Freezable workqueue blocks non-freezable workqueue during the  system resume process Peter Chen <hzpeterchen@gmail.com> - 2016-02-24 08:30 +0100
      Re: Freezable workqueue blocks non-freezable workqueue during the  system resume process Tejun Heo <tj@kernel.org> - 2016-02-25 23:10 +0100
        Re: Freezable workqueue blocks non-freezable workqueue during the  system resume process Peter Chen <hzpeterchen@gmail.com> - 2016-02-26 07:30 +0100
          Re: Freezable workqueue blocks non-freezable workqueue during the  system resume process Tejun Heo <tj@kernel.org> - 2016-03-02 17:10 +0100
            Re: Freezable workqueue blocks non-freezable workqueue during the  system resume process Jan Kara <jack@suse.cz> - 2016-03-03 10:40 +0100

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