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problem with ux400
Date: Tue, 26 Jun 90 15:05:33 -0400
We've been having a problem with our ux400.
Every so often, it pops into the cold load stream with the following error:
--> Error in the dispatcher, using the cold load stream <--
Trap: The second argument to the %32-BIT-DIFFERENCE instruction, #<DTP-PACKED-I
NSTRUCTION- 77 37777777777>, was not a fixnum
Arg 0 (PROCESS::PROC): #<PROCESS::SIMPLE-PROCESS Main X Blinkers UNAGI:0.0 0
(Genera on GLENSIDE) (0 500000) 1055205>
Arg 1 (TIME): -2046770035
s-A, <Resume>: Supply replacement argument
s-B: Return a value from the %32-BIT-DIFFERENCE instruction
s-C: Retry the %32-BIT-DIFFERENCE instruction
s-D, <Abort>: Restart process Main X Blinkers UNAGI:0.0 0 (Genera on GLENSIDE)
It happens for different processes (e.g. Ethernet, Main X Screen) as well.
Glenside is the name of our UX-400 board- it is embedded in Unagi, a
Sun 4/280. We're running genera 8.0.
We don't have the source for this function.
The source code isn't very enlightening. %32-BIT-DIFFERENCE is only
called once, and the second argument is simply the value of the global
I suspect some kind of hardware error. That bogus argument,
#<DTP-PACKED-INSTRUCTION-77 37777777777> looks like something with all
its bits on (38 of the 40 bits in a word are evident from the numbers in
the printed rep, but I don't know the internal tag for
DTP-PACKED-INSTRUCTION offhand). The only places where
*PROCESS-START-TIME* is assigned it is always assigned the value of
(SYS:%MICROSECOND-CLOCK), so perhaps this is returning the bogus value
(I don't have an I machine, so I'm not sure where this is implemented).