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--- Comment #47 from ---
(In reply to Warner Losh from comment #45)
This is also my conclusion of the problem.

I have managed to overcome the interrupt timeout matters by disabling the pci
express MSI interrupt signalling in loader.conf with 'hw.pci.enable_msi="0".

Disabling this globally solves this issue but this will cause issues with other
pci express devices that do not fully function with MSI-X interrupt signalling.

Should these specific pci express controllers be added to a quirk list or what
would be the correct way of solving the issue?

What this tunable means?
excerpt from man pci:
hw.pci.enable_msi (Defaults to 1)
 Enable support for Message Signalled Interrupts (MSI).  MSI
 interrupts can be disabled by setting this tunable to 0.

some additional details on pci express interrupts:

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