linux-kernel - Re: "PCI/MSI: Mask MSI-X vectors only on success" (boot problem on c4.large)

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Date:   Mon, 10 Jan 2022 09:10:37 +0100
From:   Stefan Roese <sr@...x.de>
To:     Andrea Righi <andrea.righi@...onical.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Michal Simek <michal.simek@...inx.com>,
        Marek Vasut <marex@...x.de>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: "PCI/MSI: Mask MSI-X vectors only on success" (boot problem on
 c4.large)

Hi Andrea,

On 1/7/22 18:32, Andrea Righi wrote:
> I'm experiencing some boot problems on c4.large instances on AWS with
> this commit applied (system stuck at boot - no oops or panic, just
> stuck):
> 
>   83dbf898a2d4 ("PCI/MSI: Mask MSI-X vectors only on success")
> 
> If I revert this commit the boot completes correctly (found doing a
> bisect).
> 
> I'm using a 5.15.12 kernel. Let me know if there's anything I can do to
> better track down the issue. For now I've just reverted the commit.

Sorry, I don't have a good idea what might go wrong here. Perhaps Thomas
has some thoughts on this?

Thanks,
Stefan