linux-kernel - Regression on linux-next (next-20250312)

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Message-ID: <SJ1PR11MB61295DE21A1184AEE0786E25B9D22@SJ1PR11MB6129.namprd11.prod.outlook.com>
Date: Fri, 14 Mar 2025 09:17:40 +0000
From: "Borah, Chaitanya Kumar" <chaitanya.kumar.borah@...el.com>
To: "robin.murphy@....com" <robin.murphy@....com>
CC: "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	"intel-xe@...ts.freedesktop.org" <intel-xe@...ts.freedesktop.org>, "Kurmi,
 Suresh Kumar" <suresh.kumar.kurmi@...el.com>, "Saarinen, Jani"
	<jani.saarinen@...el.com>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>
Subject: Regression on linux-next (next-20250312)

Hello Robin,

Hope you are doing well. I am Chaitanya from the linux graphics team in Intel.

This mail is regarding a regression we are seeing in our CI runs[1] on linux-next repository.

Since the version next-20250312 [2], we are seeing the following regression

`````````````````````````````````````````````````````````````````````````````````
<4>[    6.246790] reg-dummy reg-dummy: late IOMMU probe at driver bind, something fishy here!
<4>[    6.246812] WARNING: CPU: 0 PID: 1 at drivers/iommu/iommu.c:449 __iommu_probe_device+0x140/0x570
<4>[    6.246822] Modules linked in:
<4>[    6.246830] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.14.0-rc6-next-20250312-next-20250312-g9fbcd7b32bf7+ #1
<4>[    6.246838] Hardware name: Intel Corporation Arrow Lake Client Platform/MTL-S UDIMM 2DPC EVCRB, BIOS MTLSFWI1.R00.4400.D85.2410100007 10/10/2024
<4>[    6.246847] RIP: 0010:__iommu_probe_device+0x140/0x570
`````````````````````````````````````````````````````````````````````````````````
Details log can be found in [3].

After bisecting the tree, the following patch [4] seems to be the first "bad" commit

`````````````````````````````````````````````````````````````````````````````````````````````````````````
commit bcb81ac6ae3c2ef95b44e7b54c3c9522364a245c
Author: Robin Murphy mailto:robin.murphy@....com
Date:   Fri Feb 28 15:46:33 2025 +0000

    iommu: Get DT/ACPI parsing into the proper probe path

`````````````````````````````````````````````````````````````````````````````````````````````````````````

We also verified that if we revert the patch the issue is not seen.

Could you please check why the patch causes this regression and provide a fix if necessary?

Thank you.

Regards

Chaitanya

[1] https://intel-gfx-ci.01.org/tree/linux-next/combined-alt.html?
[2] https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20250312
[3] https://intel-gfx-ci.01.org/tree/linux-next/next-20250312/bat-arls-6/boot0.txt
[4] https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20250312&id=bcb81ac6ae3c2ef95b44e7b54c3c9522364a245c