Yeah.

mv the files aside, delete them or truncate them to 0 bytes with cat </dev/null > [file]

Don't, whatever you do, put spurious characters in them, you'll crash your filer.

Bugs have been logged for both the problem and the sm file crashes and fixes are in the pipe.

Can you tell we suffer(ed) from both these problems? 8)

The problem arises when clients with open mounts (and probably locks on files) quietly go away, followed by the filer itself rebooting and trying to fond those now-dead clients. It never gives up unless you butcher the sm/* files, carefully!

Hope that helps.