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

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Message-ID: <CA+G9fYumyaftJ9FaK+74g5iw-v9RV4qDT-SLg1XGk8G7ub2EXA@mail.gmail.com>
Date: Thu, 27 Mar 2025 14:10:21 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Roger Pau Monné <roger.pau@...rix.com>
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 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

>
> https://lore.kernel.org/xen-devel/87v7rxzct0.ffs@tglx/

Lore report link,
 - https://lore.kernel.org/all/CA+G9fYs4-4y=edxddERXQ_fMsW_nUJU+V0bSMHFDL3St7NiLxQ@mail.gmail.com/

>
> Regards, Roger.