I am debugging a driver with a very interesting quality:  If I do nothing
at all to hardware, and just initialize its softc, the kernel panics if
the driver is loaded.  (Not always right away, but within a minute.)  No
interrupts or everything; just zero out the softc in foo_attach.

If I don't initialize the softc, all is fine.

Is it possible that the softc (which is right around 10k) is somehow
Too Big?

-s