The latest FindZombieHandles fails after running ProcessCreateTests from this branch/commit:
bdb648c
The error message printed is:
(0xC0000023) - {Buffer Too Small}
The buffer is too small to contain the entry. No information has been written to the buffer.
I have not seen the message trigger under other cases. I suspect the problem is caused by there being a very large number of processes that are holding zombie process handles, rather than it being a problem with a very large number of zombie process handles.