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Subject: Re: [PATCH 3/3] x86/quirks: Add parameter to clear MSIs early on boot
To:     "Guilherme G. Piccoli" <gpiccoli@canonical.com>,
        linux-pci@vger.kernel.org, kexec@lists.infradead.org,
        x86@kernel.org
Cc:     linux-kernel@vger.kernel.org, bhelgaas@google.com,
        dyoung@redhat.com, bhe@redhat.com, vgoyal@redhat.com,
        tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
        andi@firstfloor.org, lukas@wunner.de, billy.olsen@canonical.com,
        cascardo@canonical.com, ddstreet@canonical.com,
        fabiomirmar@canonical.com, gavin.guo@canonical.com,
        jay.vosburgh@canonical.com, kernel@gpiccoli.net, mfo@canonical.com,
        shan.gavin@linux.alibaba.com
References: <20181018183721.27467-1-gpiccoli@canonical.com>
 <20181018183721.27467-3-gpiccoli@canonical.com>
From:   Sinan Kaya <okaya@kernel.org>
Message-ID: <6fd4e2d2-c0ac-b26d-9a14-0379b4421679@kernel.org>
Date:   Thu, 18 Oct 2018 16:08:27 -0400
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On 10/18/2018 2:37 PM, Guilherme G. Piccoli wrote:
> We observed a kdump failure in x86 that was narrowed down to MSI irq
> storm coming from a PCI network device. The bug manifests as a lack of
> progress in the boot process of kdump kernel, and a flood of kernel
> messages like:
> 
> [...]
> [ 342.265294] do_IRQ: 0.155 No irq handler for vector
> [ 342.266916] do_IRQ: 0.155 No irq handler for vector
> [ 347.258422] do_IRQ: 14053260 callbacks suppressed
> [...]

These kind of issues are usually fixed by fixing the network driver's
shutdown routine to ensure that MSI interrupts are cleared there.