linux-kernel - RE: [PATCH] Revert "exec: make de_thread() freezable (was: Re: Linux 4.20-rc4)

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Date:   Thu, 6 Dec 2018 18:07:23 +0900
From:   "Chanho Min" <chanho.min@....com>
To:     "'Pavel Machek'" <pavel@....cz>
Cc:     "'Oleg Nesterov'" <oleg@...hat.com>,
        "'Ingo Molnar'" <mingo@...nel.org>,
        "'Linus Torvalds'" <torvalds@...ux-foundation.org>,
        "'Linux List Kernel Mailing'" <linux-kernel@...r.kernel.org>,
        "'Rafael J. Wysocki'" <rafael.j.wysocki@...el.com>,
        "'Thomas Gleixner'" <tglx@...utronix.de>,
        "'Peter Zijlstra'" <a.p.zijlstra@...llo.nl>,
        "'Michal Hocko'" <mhocko@...e.com>, <seungho1.park@....com>
Subject: RE: [PATCH] Revert "exec: make de_thread() freezable (was: Re: Linux 4.20-rc4)

> >
> > I am sorry for the reverting this patch. It's also my fault that
> > I didn't check lockdep. But, We decided to keep this patch in our product.
> > Freeze fail is a real problem we've had for the last two years,
> > whereas lockdep's notice is not a real problem.
> > We hope this issue will be resolved soon.
> 
> I guess it makes sense for your usage.
> 
> How often do you see the failures without the patch?
Very rare, it happens about 1 in 1000 suspends.

Chanho,