Use a namespaced version of `jemalloc` about tabmat

[MarcAntoineSchmidtQC]

I'm really out of my depth with this and I'm not sure @tbenthompson has the time to work on this. Is there someone that could take care of this from the engineering team @xhochy?

[xhochy]

Maybe @cbourjau can do this ;)

[jtilly]

I'm a bit confused why this would make a difference. It is my understanding that on MacOS, jemalloc is built with --with-jemalloc-prefix="je_" by default. And it's on MacOS, where we're running into the error. Why would building the conda package with this prefix change this? Isn't jemalloc already namespaced on MacOS?

[xhochy]

The issue here is that loading a default jemalloc build also overloads C++'s new and delete operators. In the above trace, we see a C++ deallocation that was previously done with the system allocator (see also jemalloc/jemalloc#1701) . We can workaround this issue by using a namespaced version of jemalloc that also doesn't override the C++ allocator by default. I'm adding such a jemalloc build as part of conda-forge/jemalloc-feedstock#25 with the package name jemalloc-local.