linux-kernel - Re: Suspicious RCU usage in enable_drhd_fault

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Message-ID: <20250116-ludicrous-mature-ferret-8956dc@leitao>
Date: Thu, 16 Jan 2025 05:34:24 -0800
From: Breno Leitao <leitao@...ian.org>
To: Baolu Lu <baolu.lu@...ux.intel.com>
Cc: Ido Schimmel <idosch@...sch.org>, iommu@...ts.linux.dev,
	dwmw2@...radead.org, tglx@...utronix.de, peterz@...radead.org,
	linux-kernel@...r.kernel.org
Subject: Re: Suspicious RCU usage in enable_drhd_fault_handling()

Hello Baolu,

On Tue, Oct 29, 2024 at 09:15:55AM +0800, Baolu Lu wrote:
> On 2024/10/28 16:43, Ido Schimmel wrote:
> > Hi,
> > 
> > I have recently enabled CONFIG_RCU_EXPERT and CONFIG_PROVE_RCU_LIST in
> > our debug configuration file and started observing the following splat
> > [1] on one of our machines during boot. Searched the archives, but did
> > not find a similar report.
> > 
> > Not sure what is the right fix as I am not familiar with this code, but
> > I can easily test patches.
> 
> Thanks for reporting this issue. I've been able to reproduce it locally
> and will work on a fix. I'll let you know as soon as I have an update.

Have you had a chance to look at this problem? I am still seeing it in
6.13-rc7.

Thanks
--breno