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

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Date:   Fri, 7 Jan 2022 18:32:40 +0100
From:   Andrea Righi <andrea.righi@...onical.com>
To:     Stefan Roese <sr@...x.de>
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: "PCI/MSI: Mask MSI-X vectors only on success" (boot problem on
 c4.large)

Hi Stefan,

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.

Thanks,
-Andrea