On 9/26/19 3:20 PM, Jonathan Wakely wrote:
Fix data race when _Safe_iterator_base::_M_detach() runs concurrently
with
the _Safe_container_base destructor.
PR libstdc++/91910
* src/c++11/debug.cc (_Safe_iterator_base::_M_detach()): Load pointer
atomically and lock the mutex before accessing the sequence.
(_Safe_iterator_base::_M_reset()): Clear _M_sequence atomically.
Tested x86_64-linux. I plan to commit this to trunk unless somebody
sees a problem with it.
Thanks to the additional _M_sequence check in _M_detach_single() this
patch looks good.
François
