linux-kernel - Re: [BUG] mutex deadlock of dpm_resume() in low memory situation

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Date: Thu, 28 Dec 2023 15:40:09 +0900
From: Youngmin Nam <youngmin.nam@...sung.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: len.brown@...el.com, pavel@....cz, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, d7271.choe@...sung.com,
	janghyuck.kim@...sung.com, hyesoo.yu@...sung.com, "Rafael J. Wysocki"
	<rjw@...ysocki.net>, Greg KH <gregkh@...uxfoundation.org>, Youngmin Nam
	<youngmin.nam@...sung.com>, hs.gil@...sung.com
Subject: Re: [BUG] mutex deadlock of dpm_resume() in low memory situation

On Wed, Dec 27, 2023 at 09:50:01PM +0100, Rafael J. Wysocki wrote:
> On Wed, Dec 27, 2023 at 7:58 PM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> >
> > On Wednesday, December 27, 2023 7:39:20 PM CET Rafael J. Wysocki wrote:
> > > On Wednesday, December 27, 2023 5:08:40 PM CET Greg KH wrote:
> > > > On Wed, Dec 27, 2023 at 05:42:50PM +0900, Youngmin Nam wrote:
> > > > > Could you look into this issue ?
> > > >
> > > > Can you submit a patch that resolves the issue for you, as you have a
> > > > way to actually test this out?  That would be the quickest way to get it
> > > > resolved, and to help confirm that this is even an issue at all.
> > >
> > > Something like the appended patch should be sufficient to address this AFAICS.
> > >
> > > I haven't tested it yet (will do so shortly), so all of the usual disclaimers
> > > apply.
> > >
> > > I think that it can be split into 2 patches, but for easier testing here
> > > it goes in one piece.
> >
> > Well, please scratch this, it will not handle "async" devices properly.
> 
> This
> 
> https://lore.kernel.org/linux-pm/6019796.lOV4Wx5bFT@kreacher/
> 
> should address the issue properly (it has been lightly tested).
> 
> Please give it a go and let me know if it works for you (on top of 6.7-rc7).
> 
Thanks for your help.
Actually, this is very rare case on our side and it is the first time for us to see this issue.
Anyway, let me test and let you know.