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bbfa235
(Get the code!)
Thanks a lot for your hard work in investigating this issue, very appreciated!
I've been fighting with this IRQ problem for almost 2 years now. Same thing as you reported, those random "soft resetting link" messages and drive resets out of the blue.
Unfortunately, no one wants to tackle this issue, which I believe is also a bug deeply rooted in the 3.x kernels.
The only way out _for me_ was just playing dice with the drives: swapping what is on the external PCI IDE/SATA controller, until there are no more errors. It's like human beings: some pairs just would not match. :)
It can, however, get quite time-consuming with lots of drives, and 4 hours of continuous "reswap-reboot" cycles are not rare at all. But once it works, it will keep working, so it pays off after all :)
BTW I'm sick and tired of hearing "your drive is faulty". NO. IT'S NOT! It will sometimes just work solely on the onboard SATA controller and not on _any_ SATA controller card plugged into the PCI port.
Besides, I am pretty sure that people even tossed out their innocent drives just because that kernel or udev bug (or feature?!) drove them insane.
P.S. bug 978384 either does not exist, was removed or you mistyped the bug number. Gives me a 404 here...