FreeBSD/ZFS on 9.3-RELEASE chews up memory with "wide" directories when calling readdir, etc; causes trap 12 panics

[Garrett Cooper]

Hi,
	Long story short, I had a lot of mail spooled up in /var/spool. When I did ls /var/spool, ZFS chewed up almost all 12GB of my memory in <10 mins (because there were enough files there) and the system eventually panicked because [I assume that a memory allocation failed and] a trap 12 panic was caught. I don’t have the exact details, but it should be relatively easy to repro (YMMV if you have a boatload of RAM):

repro_end=10000000000
for i in $(seq 1 $repro_end); do mktemp tmp.XXXXXXXXXXXX; done
ls

	This might be ameliorated via r281026, but this change is only available in CURRENT (so far), and I haven’t tested it.
	Are there any comments about this scalability issue with FreeBSD/ZFS?
Thanks,
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