[Bug libstdc++/70794] New: vector.push_back() crashes with std::bad_alloc after 2^32 calls

[numien at deathwyrm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70794

            Bug ID: 70794
           Summary: vector.push_back() crashes with std::bad_alloc after
                    2^32 calls
           Product: gcc
           Version: 5.3.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: numien at deathwyrm dot com
  Target Milestone: ---

Created attachment 38340
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38340&action=edit
Minimal test program

Despite std::vector::max_size() returning 18446744073709551615, a test program
to repeatedly call std::vector::push_back() crashes on the 4294967297th
iteration with a std::bad_alloc exception.

I am compiling in 64-bit mode, and my system should have plenty of memory. The
fact it's reaching exactly 2^32 indicates to me that it's likely a bug.

The test program I used is attached.