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

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Message-ID: <20240802151619.GN39708@noisy.programming.kicks-ass.net>
Date: Fri, 2 Aug 2024 17:16:19 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Boqun Feng <boqun.feng@...il.com>
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 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.