Possible memory leak?

[fw42]

After using cld3-asm, I've noticed the following warning after a while (not right away):

Cannot enlarge memory arrays to size 16781312 bytes (OOM). Either (1) compile with -s TOTAL_MEMORY=X with X higher than the current value 16777216, (2) compile with -s ALLOW_MEMORY_GROWTH=1 which allows increasing the size at runtime, or (3) if you want malloc to return NULL (0) instead of this abort, compile with -s ABORTING_MALLOC=0

Looks like maybe a possible memory leak. Is this a known issue? It seems to get worse with higher concurrency.