https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66547
--- Comment #1 from Matthew Peters <matt at hpamotorsport dot com> --- Adding some notes. The stack is a local stack generated with "static WORK_AREA(...)" from ChibiOS. I've checked and the stack is aligned at the beginning of performance_suite_thread. I've been unable to make a test that produces the error.