linux-kernel - Re: [PATCH -next 1/8] rcu: Fix rcu_read

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Message-ID: <68b5b122-036b-475a-85bb-e39830f99fbe@paulmck-laptop>
Date: Fri, 2 Jan 2026 11:51:10 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Joel Fernandes <joelagnelf@...dia.com>,
	Boqun Feng <boqun.feng@...il.com>, rcu@...r.kernel.org,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang@...ux.dev>, Shuah Khan <shuah@...nel.org>,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	Yao Kai <yaokai34@...wei.com>, Tengda Wu <wutengda2@...wei.com>
Subject: Re: [PATCH -next 1/8] rcu: Fix rcu_read_unlock() deadloop due to
 softirq

On Fri, Jan 02, 2026 at 12:30:09PM -0500, Steven Rostedt wrote:
> On Fri, 2 Jan 2026 12:28:07 -0500
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > Stacktrace should have recursion protection too.
> > 
> > Can you try this patch to see if it would have fixed the problem too?
> 
> As I believe the recursion protection should be in the tracing
> infrastructure more than in RCU. As RCU is used as an active participant in
> the kernel whereas tracing is supposed to be only an observer.
> 
> If tracing is the culprit, it should be the one that is fixed.

Makes sense to me!  But then it would...  ;-)

							Thanx, Paul