https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116369
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #4) > Note I think there is a front-end (and a library) issue too. > > In libstdc++-v3/include/debug/safe_base.h we have: > ``` > /// The list of mutable iterators that reference this container > _Safe_iterator_base* _M_iterators; > > /// The list of constant iterators that reference this container > _Safe_iterator_base* _M_const_iterators; > > /// The container version number. This number may never be 0. > mutable unsigned int _M_version; > > ``` > > The segfault is the store to _M_const_iterators. Which should have been > marked as mutable Why? It's only ever written to in the constructor and in non-const member functions. One of those functions is _M_detach_all() which is called from the destructor, but that's fine because 'this' is non-const during construction and destruction. (This makes me wonder how any object with a non-trivial destructor that calls some non-inline function can ever be placed in rodata, because the destructor could perform arbitrary writes to data members which aren't necessarily removed by DSE.)
