[PATCH] PR libstdc++/91910 fix data race in Debug Mode destructors

[Jonathan Wakely]

On 26/09/19 14:20 +0100, 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.

We need the same change in the _Safe_local_iterator_base::_M_detach()
function, as in this new patch.


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