linux-kernel - Re: Linux 6.3-rc2

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Date:   Tue, 14 Mar 2023 12:40:18 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 6.3-rc2

On Tue, Mar 14, 2023 at 12:18:33PM +0100, Frederic Weisbecker wrote:
> How does the following look like as a culprit?
> 
> 62b95a7b44d1 (ARM: 9282/1: vfp: Manipulate task VFP state with softirqs disabled)

Ooh yeah, that asm implementation of local_bh_{dis,en}able completely
miss out on the lockdep state tracking. Also I think it breaks RCU, note
how __local_bh_disable_ip() explicitly does rcu_read_lock() for the
first bh-disable.