jonathan@uunet.uu.net (Jonathan Hue) (04/21/89)
Why do all of our Suns spit out "spurious level X interrupt" kernel printfs? (Sun-3/[12]60, SunOS 3.5) We see these whenever we rewind the 1/2" tape drive (Fujitsu on a Xylogics 472), which seem to be harmless, and sometimes when using a National Instrments GPIB controller (connected to an Eikonix scanner, using their driver). These aren't harmless, as the machine dies soon afterwards, usually due to a kernel bus error. I think I know what a spurious interrupt is, it's when something tugs on IRQ[1-7], and the CPU performs an interrupt acknowledge cycle and doesn't see DSACK[01], so it gets a bus error. I'm curious why they occur, it seems like a hw bug on someone's part. -Jonathan uunet!jvc!jonathan