Your actually fighting two issues here.

The "to many iterations" part is harmless and can be ignored, it has
nothing to do with why the system crashes.

Your system is crashing because an IRQ gets disabled, when an IRQ get
disabled, that means anything using it stops talking with the kernel, if
thats your harddisk controler, the machine isn't going to last long
before it dies.

Disable SMP to fix the problem...

Now SMP is not the true problem here, but when you disable SMP, you
remove things like MSI/MSI-X and APIC, IOAPIC and other SMP related
features thats *known* to be broken on many motherboards. The reason I
don't say to disable the sub SMP features, is because SMP on those same
motherboards might be just as broken without MSI/MSI-X and IO-APIC
enabled, and can still crash.

Bottom line is Many Cheap Motherboard + SMP = crap. (Especially Nvidia
based ones, but I don't have information that points the finger at the
nvidia chipset being broken, it's according to the limited information I
have the motherboard vendors that has implemented the Nvidia chipset
badly and broken it)

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Random pauses when transferring data at gigabit speeds with forcedeth driver
https://bugs.launchpad.net/bugs/130075
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