linux-kernel - Re: [PATCH v4][RESEND x4] lockdep: fix deadlock issue between lockdep and rcu

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Message-ID: <Zq5KmTEnalIOHf6a@boqun-archlinux>
Date: Sat, 3 Aug 2024 08:19:53 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: "Paul E. McKenney" <paulmck@...nel.org>,
	Carlos Llamas <cmllamas@...gle.com>, Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>,
	Bart Van Assche <bvanassche@....org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Stultz <jstultz@...gle.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	linux-kernel@...r.kernel.org, kernel-team@...roid.com,
	Zhiguo Niu <zhiguo.niu@...soc.com>, stable@...r.kernel.org,
	Xuewen Yan <xuewen.yan@...soc.com>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v4][RESEND x4] lockdep: fix deadlock issue between
 lockdep and rcu

On Fri, Aug 02, 2024 at 05:16:19PM +0200, Peter Zijlstra wrote:
> On Wed, Jun 26, 2024 at 03:15:14PM -0700, Boqun Feng wrote:
> > On Tue, Jun 25, 2024 at 07:38:15AM -0700, Paul E. McKenney wrote:
> > > On Thu, Jun 20, 2024 at 10:54:34PM +0000, Carlos Llamas wrote:
> > > > From: Zhiguo Niu <zhiguo.niu@...soc.com>
> > > > 
> > > > There is a deadlock scenario between lockdep and rcu when
> > > > rcu nocb feature is enabled, just as following call stack:
> > > 
> > > I have pulled this into -rcu for further review and testing.
> > > 
> > > If someone else (for example, the lockdep folks) would like to take this:
> > > 
> > > Acked-by: Paul E. McKenney <paulmck@...nel.org>
> > > 
> > 
> > FWIW, I add this patch and another one [1] to my tree:
> > 
> > 	git://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git lockdep
> > 
> > (based on today's tip/locking/core)
> > 
> > I figured I have time to handle lockdep-only patches, which shouldn't
> > be a lot. So Ingo & Peter, I'm happy to help. If you need me to pick up
> > lockdep patches and send a PR against tip/master or tip/locking/core,
> > please let me know.
> 
> Sorry, I've been hopelessly behind on everything. Yes it would be nice
> if you could help vacuum up some of the lockdep patches.
> 

Glad I can help! I will send a PR to tip tree between rc2 and rc3.

Regards,
Boqun

>