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

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Message-ID: <20260102123009.453dfb90@gandalf.local.home>
Date: Fri, 2 Jan 2026 12:30:09 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Joel Fernandes <joelagnelf@...dia.com>
Cc: "Paul E . McKenney" <paulmck@...nel.org>, 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, 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.

Thanks,

-- Steve