Signal Stack Error

[Stuart Hansen]

We have a Lisp based dynamic simulator that we have been using without
problems on a Sun 3/60 running SunOS release 4.0 and SCL release 2.1.3.

We recently upgraded to a SPARCstation 1, running SunOS 4.0.3. and SCL
release 3.0, patched to 3.0.1.  When running on the SPARCstation the
simulator consistently crashes about 30 minutes into the simulation giving
the error:

"Sigcontext pointer doesn't point to signal stack as expected.
 Recursive interrupts on signal stack.
 Stopping lisp.
 Stopped (signal)"

This error occurs whether we are using the compiled version or the
interpreted version.

Any insights or assistance would be appreciated.

Stuart Hansen
shansen at herky.cs.uiowa.edu