[PATCH 3/3] x86/quirks: Add parameter to clear MSIs early on boot

Sinan Kaya okaya at kernel.org
Thu Oct 18 13:08:27 PDT 2018

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.

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