https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122197
--- Comment #18 from maic <gnu.ojxq8 at dralias dot com> --- I reported a similar mutex one in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123912, but it got closed as a duplicate of this one. I worked around this particular one myself, but I guess there may be different patterns that have a mutex and condition_variable include.
