Adding Periodic Snapshot Tasks generates errors in debug log.
Adding periodic snapshot tasks to a clean FreeNAS 11.2-U1 install results in the following errors filling up /var/log/debug.log:
FreeNAS /autosnap.py: [ws4py:360] Closing message received (1000) 'b'''
These errors repeat every minute. If you delete all the periodic snapshot tasks, the errors disappear. The snapshots still seem to be taken, but the error is a bit jarring...and clutters up the debug.log file when you're looking for other issues.