ip_allocator | helps ISP 's subnet their IPv4 and IPv6 address space | TCP library

Thanks to Passer By who prompted me to go through the Boost.Interprocess documentation again, I stumbled upon this example, which luckily is exactly what I'm trying to do. After confirming that it works on my end (it does), I started gradually morphing it into a copy of my own program, and found the issue.

The difference was the choice of either std::vector or boost::interprocess::vector (also known as boost::container::vector). std::vector is supposed to work fine with a custom allocator, but the issue lies in Microsoft's implementation: _Orphan_all, the function where the access violation happens, is part of the Debug Iterators functionality. That system keeps track of which iterator belongs to which container, but does so by storing raw pointers, which become stale as the vector changes address spaces and end up causing the crash when the vector tries to update the bookkeeping data upon destruction.

Indeed, compiling in Release mode (where _ITERATOR_DEBUG_LEVEL == 0 and debug iterators are deactivated) or using Boost's vector implementation both work flawlessly.