I get sigsegv when doing
(make-instance 'standard-class :name 3)
The sigsegv is observed both on Linux FC4 compiled
from source (2.39) and Windows distributed binaries
(2.39, with gettext and readline), as well as in an
older 2.36 FC4 build I tried.
Attached is a gdb session as suggested in impnotes
(built with --with-debug etc)