linux-kernel - Re: Deadlock at reboot?

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Date:   Fri, 4 Mar 2022 16:32:28 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Deadlock at reboot?

On Fri, Mar 04, 2022 at 04:20:42PM +0100, Maxime Ripard wrote:
> Hi Greg,
> 
> On Fri, Mar 04, 2022 at 03:15:36PM +0100, Greg Kroah-Hartman wrote:
> > On Fri, Mar 04, 2022 at 11:49:42AM +0100, Maxime Ripard wrote:
> > > Hi,
> > > 
> > > I'm not entirely sure who I'm supposed to send this to, so apologies if
> > > I forgot somebody.
> > > 
> > > I've had an issue when rebooting on and off for a couple of monthes, but
> > > I got a stacktrace from lockdep today:
> > > 
> > > [71721.872904] reboot: Restarting system
> > > [71721.876743] ------------[ cut here ]------------
> > > [71721.877081]
> > > [71721.877084] ======================================================
> > > [71721.877086] WARNING: possible circular locking dependency detected
> > > [71721.877088] 5.17.0-rc6-next-20220303-v8+ #10 Not tainted
> > 
> > This is linux-next, does this also happen on Linus's tree?
> > 
> > If not, can you bisect to find the offending commit?
> 
> Like I said, it appeared with multiple versions across the past few
> monthes (I only ever got the trace with that next-version though) so I'm
> not sure the issue has been introduced recently.
> 
> I'll try a couple of recent Linus' tags, and bisect if I can find
> something of interest.

It happens with 5.17-rc6, I'll try with older releases

Maxime

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