Re: Fwd: Re: GC crashes

[Richard M. Stallman]

    I've asked Friedrich to check if the crashes go away with
    hyperthreading turned off.  If so, this may be a Linux bug, or a GCC
    bug.

This is useful progress.  It sure seems to explain why the bug
never happens for most of us.  However, it does not directly
help us localize and fix the bug.

If we determine that the bug happens with certain versions of GCC
and not with certain other versions, that would help more.
Because then it would be possible to compile some files with each
GCC version, and thus determine which file is at fault.
Then, by splitting that file in different places, it would be
possible to determine which function is at fault.  Then
comparing the assembler code made from that function by the two
GCC versions one might spot the bug.

There's no way to use the hyperthreading variable to do this
because we can't run some files with hyperthreading and some files
without.