netdev - Re: CPU stalls with CONFIG_PREEMPT_RT enabled on next-20251006 (Renesas RZ/G2L & RZ/G3E)

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Message-ID: <dd6d8632-7102-4ebc-92e6-f566683f4a33@lunn.ch>
Date: Tue, 7 Oct 2025 20:30:01 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc: netdev <netdev@...r.kernel.org>,
	Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Subject: Re: CPU stalls with CONFIG_PREEMPT_RT enabled on next-20251006
 (Renesas RZ/G2L & RZ/G3E)

On Tue, Oct 07, 2025 at 05:40:09PM +0100, Lad, Prabhakar wrote:
> Hi All,
> 
> With CONFIG_PREEMPT_RT enabled, I’m observing CPU stalls from the Rx
> path on two different drivers across Renesas platforms.

Do you have lockdep/CONFIG_PROVE_LOCKING enabled? Is this a deadlock?
Something else is already holding the lock?

	Andrew