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LSan crashes a lot recently, and it seems to be caused by tls. Since we're not actually making use of C11s _Thread_local we can set the use_tls=0 option. This causes a false positive in dlopen() that apprently uses thread locals. We suppress this with __lsan_disable()/__lsan_enable().
This might also cause new leaks in other libraries, we'll have to run CI to see. 🙂
/cc @ju1ius