bugfix? (unconfirmed, testing): segfault when writing asynchronously

I have undone a very small optimization with using pre-malloced memory,
which seems to have some issues. Now I am doing mallocs and at least in
test environment this seems to solve the issue. The code now needs more
review. If it runs flawlessly for some time, I may try to re-enable to
pre-malloc, but not necessarily: its performance benefit is very mild
(aka: I don't think it justifies introducing bigger complexities).

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