If so, it's not obvious where: scilab does contain some C/C++ code (as well as Java), but there aren't any asm() or __builtin_ia32* calls in it, or any -march options in the build log. Maybe it's in a dependency, not scilab itself?
There is an open "illegal instruction crash in Xcos" bug upstream, which may or may not be related: https://bugzilla.scilab.org/show_bug.cgi?id=11003#c6
Alexis Murzeau wrote:
will such bug-fix upstream release be accepted in buster, now that we are in full freeze ?
Generally not: Debian prefers not to fix minor bugs during freeze because this might accidentally create major ones.
https://release.debian.org/buster/freeze_policy.html