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From:   "Chanho Min" <chanho.min@lge.com>
To:     "'Pavel Machek'" <pavel@ucw.cz>
Cc:     "'Oleg Nesterov'" <oleg@redhat.com>,
        "'Ingo Molnar'" <mingo@kernel.org>,
        "'Linus Torvalds'" <torvalds@linux-foundation.org>,
        "'Linux List Kernel Mailing'" <linux-kernel@vger.kernel.org>,
        "'Rafael J. Wysocki'" <rafael.j.wysocki@intel.com>,
        "'Thomas Gleixner'" <tglx@linutronix.de>,
        "'Peter Zijlstra'" <a.p.zijlstra@chello.nl>,
        "'Michal Hocko'" <mhocko@suse.com>, <seungho1.park@lge.com>
References: <CAHk-=wgdsXyCaLsFEpyUpAeRqVS69u=xo4rzEN+cS=xwz2gajg@mail.gmail.com> <20181203074700.GA21240@gmail.com> <20181203115601.GA31795@redhat.com> <20181204091736.GD73770@gmail.com> <20181205143618.GA9535@redhat.com> <02a901d48d41$40aff110$c20fd330$@lge.com> <20181206085748.GA16059@amd>
In-Reply-To: <20181206085748.GA16059@amd>
Subject: RE: [PATCH] Revert "exec: make de_thread() freezable (was: Re: Linux 4.20-rc4)
Date:   Thu, 6 Dec 2018 18:07:23 +0900
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> >
> > 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,