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From: Frederic Weisbecker <frederic@kernel.org>
To: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Cc: Joel Fernandes <joelagnelf@nvidia.com>,
	linux-kernel@vger.kernel.org,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@kernel.org>,
	Joel Fernandes <joel@joelfernandes.org>,
	Josh Triplett <josh@joshtriplett.org>,
	Boqun Feng <boqun.feng@gmail.com>,
	Uladzislau Rezki <urezki@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Zqiang <qiang.zhang1211@gmail.com>,
	rcu@vger.kernel.org, bpf@vger.kernel.org, xiqi2@huawei.com
Subject: Re: [PATCH 2/2] rcu: Fix lockup when RCU reader used while IRQ exiting
Date: Thu, 12 Jun 2025 13:37:48 +0200	[thread overview]
Message-ID: <aEq8DAHY0ycCOmoN@localhost.localdomain> (raw)
In-Reply-To: <5568ff6b-6d5c-ea63-3c4a-c0714103aa9d@huawei.com>

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

  reply	other threads:[~2025-06-12 11:37 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-06-09 18:01 [PATCH 1/2] context_tracking: Provide helper to determine if we're in IRQ Joel Fernandes
2025-06-09 18:01 ` [PATCH 2/2] rcu: Fix lockup when RCU reader used while IRQ exiting Joel Fernandes
2025-06-09 19:49   ` Boqun Feng
2025-06-09 23:26     ` Frederic Weisbecker
2025-06-10  0:49       ` Boqun Feng
2025-06-10 12:23   ` Frederic Weisbecker
2025-06-10 15:47     ` Joel Fernandes
2025-06-12  3:06     ` Xiongfeng Wang
2025-06-12 11:37       ` Frederic Weisbecker [this message]
2025-06-11 16:05   ` Boqun Feng
2025-06-11 16:16     ` Paul E. McKenney
2025-06-11 16:21       ` Boqun Feng
2025-06-09 18:05 ` [PATCH 1/2] context_tracking: Provide helper to determine if we're in IRQ Joel Fernandes
2025-06-11 16:25 ` Frederic Weisbecker

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