Re: Crash in GC during save-application

[Byron_Davies-R15546@email.sps.mot.com]

We finally tracked this down.  The cause of the problem was a fixnum-declared 
variable that got too large and overflowed, causing damage to something or 
other.  The short-term result was a negative integer where there should have 
been a positive.  The long-term result was a crash during the save-application 
GC, which also corrupted something in PRAM.

Macsbug, which we had previously found useful in diagnosing MCL crashes, 
actually seemed to make this one worse.  With Macsbug, this problem would crash 
the Mac.  Once we removed Macsbug, MCL would exit somewhat more gracefully with 
an error of "Type 1".  This still didn't provide any direct information about 
the bug, but it made continued experimentation a little easier.

Thanks to everyone for their sympathy and suggestions.  I hope this information 
will prove useful to others.

Byron Davies
Motorola Semiconductor
R15546@email.mot.com