On Fri, 26 Aug 2022 at 06:56, Rebecca Ribas via Gcc <gcc@gcc.gnu.org> wrote: > > Hi gcc list, > > I'm learning c++ coroutines but I ran into a behavior that I can't make > sense of. > > Here is the godbolt link: https://godbolt.org/z/rdPo8ceKP > > In some cases, it appears that temporaries are incorrectly freed, the code > shows test1 and test2 that works as expected, but test3 raises a "used > after free" error from address sanitizer that doesn't make sense to me. > > I'm aware that there are some potential caveats with passing references to > a coroutine, so I'm possibly missing some subtle detail. But it looks like > it might be a gcc bug since the same doesn't happen with clang.
Yes, it's probably a bug. There have been a few bugs with temporaries and coroutines, e.g. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98401 If yours is different to that one, please file a new bug in bugzilla. If you need an account, please email the address given when trying to sign up for an account and we'll create one promptly. Thanks! > > I tested a few different versions of g++ available on ubuntu and godbolt > but got the same result. > > The compilations flags I used were: -ggdb3 -Og -std=c++20 -Wall -Wextra > -Werror -D_GLIBCXX_DEBUG -fsanitize=address > > Cheers!
