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

Garrett Cooper yaneurabeya at
Tue Apr 7 06:37:59 UTC 2015

	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):

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

	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?
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 496 bytes
Desc: Message signed with OpenPGP using GPGMail
URL: <>

More information about the freebsd-stable mailing list