"ko1 (Koichi Sasada)" <redmine / ruby-lang.org> wrote: > Ad-hoc solution, but environment variable (such as > RUBY_THREAD_MACHINE_STACK_SIZE) is enough for this issue? I think environment variable is too ugly, but it's your (or matz's) choice to support it. Also, it seems the recursive structure problem with gc_mark_children() is gone since r37075. Probably better to discuss #6695 instead.