When are machine checks suppose to be recoverable?

[David Woodhouse]

On Mon, 2005-08-22 at 23:56 -0300, Marcelo Tosatti wrote:
> "My dual G4 PowerMac crashes sometimes when it probes for the (absent)
> serial ports. Theoretically it's supposed to take a machine check and
> recover -- but it doesn't always work like that."
> 
> Maybe you just need the proper entry in the exception table for IO
> inb/outb?
> 
> Is there a stacktrace, David?

No, just a silent death when probing for one of the serial ports;
usually not the first. It doesn't seem to even make it into the machine
check handler. Adding printks into serial_inb and serial_outb makes it
much less likely to happen -- could be something bizarre about alignment
of the instructions which cause the machine check, or time elapsed from
one machine check to the next.

-- 
dwmw2