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

From: Tejun Heo
Date: Thu Feb 25 2016 - 17:01:19 EST

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.

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