linux-kernel - Re: [PATCH 1/3] rcu: Return early if callback is not specified

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Message-ID: <e1e70709-b799-4da1-9f0f-9d222b315db4@nvidia.com>
Date: Mon, 16 Jun 2025 22:25:11 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: Boqun Feng <boqun.feng@...il.com>, Uladzislau Rezki <urezki@...il.com>
Cc: Boqun Feng <boqun@...me.name>, "Paul E. McKenney" <paulmck@...nel.org>,
 Joel Fernandes <joel@...lfernandes.org>,
 Neeraj Upadhyay <Neeraj.Upadhyay@....com>, RCU <rcu@...r.kernel.org>,
 LKML <linux-kernel@...r.kernel.org>,
 Frederic Weisbecker <frederic@...nel.org>,
 Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH 1/3] rcu: Return early if callback is not specified

On 6/12/2025 5:03 PM, Boqun Feng wrote:
[..]
> 
>> The kernel robot reports it and it is already a strong indication that
>> the subsystem is not hardened against invalid inputs:
>>
>> "BUG: unable to handle kernel NULL pointer dereference in rcu_core (3)"
>>
>> so this in the rcu_core() which is part of RCU.
>>
>> But, anyway Joel should decide. I shared my opinion :)
>>
> 
> Of course, my point is that the urgency is not high enough so we have to
> put it in rcu/fixes, but it's a fix, and if Joel had the time to do
> it, feel free. Joel's decision.
> 
Yeah I feel Vlad's fix for a crash is important so I'll send this up to Linus
for 6.16 after some testing this week. For the other 2 patches, since that is
triggered by a trace point, I'll just let Neeraj take them for 6.17.

thanks,

 - Joel