https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107590
--- Comment #9 from Peter Dimov <pdimov at gmail dot com> --- The easiest way to reproduce the issue is with the following test: https://github.com/boostorg/smart_ptr/blob/c577d68b0272fd0bddc88ea60a8db07219391589/test/spinlock_test.cpp This crashes because - presumably - sp2 is on an odd address. The definition of the spinlock class is here: https://github.com/boostorg/smart_ptr/blob/c577d68b0272fd0bddc88ea60a8db07219391589/include/boost/smart_ptr/detail/spinlock_gcc_atomic.hpp
