Bug: No irq handler for vector (irq -1) on C602

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Hello,

ran into this error for a first time over veru large hardware
span/uptime (the server which experienced the error is identical to
others, and I had absolutely none of MSI-related problems with this
hardware ever).

Running 3.10 at host, I had one (of many) VM on it which produced
enormous count of context switches due to mess inside (hundreds of
active apache-itk workers). All VM threads are pinned to the first
sibling for every core on two-head system, e.g. having 24 HT cores and
second half is just HT siblings, cpuset cg limits threads only to
first. The error itself was produced a second after reset event for
this VM (through libvirt, if exact call matters):

[7696746.523478] do_IRQ: 11.233 No irq handler for vector (irq -1)

Since there are no hints for this exact error recently, and it
triggered by critical part of the kernel code, I think it may be
interesting to re-raise the issue (or, at least, make a better bound
for error source).
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