Sorry, I should explain a bit more. Gentoo Linux uses a tool named emerge to handle packages. It is written in python. So, by that command I initiated re-compilation of python itself but it crashed quickly. At that moment emerge called the python available on the system at that time which was configured using --with-pydebug.
Meanwhile I went to install DUMA http://duma.sourceforge.net/ and started to re-run emerge.
# emerge duma
# export LD_PRELOAD=/usr/lib64/libduma.so.0.0.0
# sysctl -w vm.max_map_count=1000000
# emerge dev-lang/python:2.7
Thanks for your analysis, will try to stitch something.