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> I also wonder about the performance cost of a recursive lock.
An alternative is to disable the garbage collector in malloc():
 def malloc(self, size):
 ...
 enabled = gc.isenabled()
 if enabled:
 # disable the garbage collector to avoid a deadlock if block
 # is freed (if self.free() is called)
 gc.disable()
 try:
 with self._lock:
 size = self._roundup(max(size,1), self._alignment)
 ...
 return block
 finally:
 if enabled:
 gc.enable()
gc.disable() and gc.enable() just set an internal flag and so should be fast.