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

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Message-ID: <20260109113850.2133c5ff@gandalf.local.home>
Date: Fri, 9 Jan 2026 11:38:50 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Yao Kai <yaokai34@...wei.com>
Cc: Joel Fernandes <joelagnelf@...dia.com>, <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>, Tengda Wu <wutengda2@...wei.com>,
 <liuyongqiang13@...wei.com>, <yujiacheng3@...wei.com>
Subject: Re: [PATCH -next 1/8] rcu: Fix rcu_read_unlock() deadloop due to
 softirq

On Mon, 5 Jan 2026 12:16:11 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Sun, 4 Jan 2026 11:20:07 +0800
> Yao Kai <yaokai34@...wei.com> wrote:
> 
> > Yes, I tested Steve's patch. It fixes the issue too.
> > 
> > Tested-by: Yao Kai <yaokai34@...wei.com>  
> 
> Thanks for testing. I'll send out a formal patch.
> 
> And yes, I agree we should do both.

FYI, the tracing recursion protection made it to mainline:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5f1ef0dfcb5b7f4a91a9b0e0ba533efd9f7e2cdb

-- Steve