We’ve been having an issue on one of our machines recently which uses rrdtool on zfs along side nfs where it wedges hard every few weeks. Machine is still pingable but won’t respond on existing or new sessions.
We believe we’ve just tracked down the issue to a leak in fadvise which rrdtool uses causing kvm exhaustion which in turn triggers a bug in zfs.
This leak has already been fixed in stable by svn r234661
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