https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66303
--- Comment #3 from Tatsushi Inagaki <e29253 at jp dot ibm.com> --- Created attachment 35641 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35641&action=edit gdb session of callback() called from runtime.Caller(skip==3)
