linux-kernel - Re: [PATCH 2/2] rcu: Fix lockup when RCU reader used while IRQ exiting

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Message-ID: <aEq8DAHY0ycCOmoN@localhost.localdomain>
Date: Thu, 12 Jun 2025 13:37:48 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: Xiongfeng Wang <wangxiongfeng2@...wei.com>
Cc: Joel Fernandes <joelagnelf@...dia.com>, linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Uladzislau Rezki <urezki@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>, rcu@...r.kernel.org,
	bpf@...r.kernel.org, xiqi2@...wei.com
Subject: Re: [PATCH 2/2] rcu: Fix lockup when RCU reader used while IRQ
 exiting

Le Thu, Jun 12, 2025 at 11:06:07AM +0800, Xiongfeng Wang a écrit :
> +cc (Qi, my colleague who helps testing the modification)
> 
> On 2025/6/10 20:23, Frederic Weisbecker wrote:
> > Le Mon, Jun 09, 2025 at 02:01:24PM -0400, Joel Fernandes a écrit :
> >> During rcu_read_unlock_special(), if this happens during irq_exit(), we
> 
> ...skipped...
> 
> We have tested the below modification without the modification written by Joel
> using the previous syzkaller benchmark. The kernel still panic.
> The dmesg log is attached.

Yes, it's a cleanup that doesn't include Joel's change yet. So this is
expected.

Thanks.

-- 
Frederic Weisbecker
SUSE Labs