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anyone else ever seen this?

    Date: Wed, 17 Jan 90 17:16 EST
    From: jka@vega.crd.ge.com (Jim Aragones)

    On a different note than the "How I think Symbolics should run their
    company" conversations...

Actually, I suspect hardware failure.  The variable FLIPPED can take on
only the values T or NIL, according to the source code.

Of course, since you edited out the backtrace, and didn't include any
information about the software version you're running, this can only be
considered to be a guess.  I've never seen this failure mode before.

1    Trap: The first argument given to the ROT instruction, 2217307480, was not a fixnum.
0    While in the function SI:FLIP-EPHEMERAL-SPACES  SI:GC-FLIP-EPHEMERAL-SPACES-NOW  SI:GC-PROCESS

    The condition signalled was DBG:WRONG-TYPE-ARGUMENT-TRAP
    Trap microcode PC = #o167 in 3670-MIC 420
    Error-table entry = (WRONG-TYPE-ARGUMENT ANY (:FIXNUM))

    1SI:FLIP-EPHEMERAL-SPACES0  (P.C. = 102)
       Rest arg (SI:LEVELS): NIL
       Local 1 (SI:FLIP-MASK): 2217307480
       Local 2 (SI:FLIPPED): 22395
       Local 3 (SI:LEVEL): 4
       Special SYS:INHIBIT-SCHEDULING-FLAG: T

    ...


    I think its easily explained, if you look here |
						   V
    3600 Processor, 6144K words Physical memory, 137500K words Swapping space.

    We were quite amused :-)