It caused some troubles when a lock inside kmalloc is contended
because task local storage would allocate memory using kmalloc.
It'd create a recusion and even crash in my system.
There could be a couple of workarounds but I think the simplest
one is to use a pre-allocated hash map.
We could fix the task local storage to use the safe BPF allocator,
but it takes time so let's change this until it happens actually.