Assertion failure in MmRebalanceMemoryConsumersAndWait()

While testing Firefox 48 (from RAPPS) with two tabs opened: one for chat.reactos.org, and the second for discord.com, I hit the condition of running low on memory (my VM has "only" 512MB of RAM to test these sorts of scenarios), when suddenly MmRebalanceMemoryConsumersAndWait() hit the following assertion:

Assertion X:\reactos\ntoskrnl\mm\balance.c(302): PsGetCurrentProcess()->AddressCreationLock.Owner != KeGetCurrentThread()

See the attached log for more details.