Comment 23 for bug 1521173

Btw, I reported mine upstream long ago and got response from upstream that "I've thought about this problem a bit, but realistically I don't have time to do the fix I'd like to do /.../ Anybody else who is interested should feel free to take a crack at it."

See http://permalink.gmane.org/gmane.linux.kernel.pci/48697

Also some googling finds me a few other reports with very similar symptoms, e g:

https://bugzilla.kernel.org/show_bug.cgi?id=111601

https://lkml.org/lkml/2015/9/2/573