The new secret memory pool was causing CI failures in the fuzzing code,
due to the fuzzer compiling its binaries with memory sanitizer support.
https://doc.rust-lang.org/beta/unstable-book/compiler-flags/sanitizer.html
Using lazy_static was – intentionally – introducing a memory leak, but the
LeakSanitizer detected this and raised an error.
Now by using thread_local we are calling the destructors and so – while still being a
memory leak in practice – the LeakSanitizer no longer detects this behaviour as an error.
Alternatively we could have used a known-leaks list with the leak-sanitizer, but this would have increased the complexity of the build setup.
Finally, this was likely triggered with the migration to memsec, because libsodium circumvents the malloc/free calls,
relying on direct calls to MMAP.
