linux-kernel - Re: next-20250324: x86_64: BUG: kernel NULL pointer dereference __pci_enable_msi

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Message-ID: <Z-UvxG4EIeO5zOgU@macbook.local>
Date: Thu, 27 Mar 2025 12:00:20 +0100
From: Roger Pau Monné <roger.pau@...rix.com>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	PCI <linux-pci@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	lkft-triage@...ts.linaro.org,
	Linux Regressions <regressions@...ts.linux.dev>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	shivamurthy.shastri@...utronix.de,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Anders Roxell <anders.roxell@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sasha Levin <sashal@...nel.org>
Subject: Re: next-20250324: x86_64: BUG: kernel NULL pointer dereference
 __pci_enable_msi_range

On Thu, Mar 27, 2025 at 02:10:21PM +0530, Naresh Kamboju wrote:
> On Tue, 25 Mar 2025 at 20:23, Roger Pau Monné <roger.pau@...rix.com> wrote:
> >
> > On Tue, Mar 25, 2025 at 04:56:33PM +0300, Dan Carpenter wrote:
> > > If I had to guess, I'd say that it was related to Fixes: d9f2164238d8
> > > ("PCI/MSI: Convert pci_msi_ignore_mask to per MSI domain flag").  I
> > > suspect d->host_data can be NULL.  I could be wrong, but let's add Roger
> > > to the CC list just in case.
> >
> > Indeed, sorry.  There's a patch from Thomas to switch to using
> > pci_msi_domain_supports() for fetching the flag, as there's no
> > guarantee all call contexts will have an associated msi_domain_info:
> 
> Thanks Roger for the clarification.
> LKFT started noticing this issue on the Linus Torvalds master branch from
> March 26, 2025 at git describe: v6.14-1979-g61af143fbea4
> 
> Anders bisected and confirmed that,
>   # first bad commit:
>      [c3164d2e0d181027da8fc94f8179d8607c3d440f]
>      PCI/MSI: Convert pci_msi_ignore_mask to per MSI domain flag
> 

Hello,

The fix has already been committed to Linux master, commit hash
3ece3e8e5976c49c3f887e5923f998eabd54ff40.

Regards, Roger.