Comment 74 for bug 1428121
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0e1f616
(Get the code!)
Well, the biggest question is whether this is specific to what parameter, IOW, which condition triggers the bug. Is it only on your mobo models, or only on a certain chipset, or only on some chipset revisions, or specific to (all) Haswell models, or happening only with combination of IOMMU (or any other kernel) setup?
It's hard to answer without more testing.
And, I have a bunch of (more than 20) Haswell machines here for testing, and none of them show such a problem. That's why I didn't apply any patch, so far; i.e. you're the only person hitting the issue, and it can be worked around by a known option :)
Once if we can narrow down the condition, I'd be glad to apply the fix.