Simon Marlow authored Mar 28, 2012 and pcapriotti committed Apr 01, 2012

If we overflow the current stack chunk and copy its entire contents
into the next stack chunk, we could end up with two UNDERFLOW_FRAMEs.
We had a special case to catch this in the case when the old stack
chunk was the last one (ending in STOP_FRAME), but it went wrong for
other chunks.

I found this bug while poking around in the core dump attached to
options and running the nofib suite: imaginary/wheel_sieve2 crashed
with +RTS -kc600 -kb300.

I don't know if this is the cause of all the symptoms reported in

MERGED from commit 734f1d48