I've just noticed my box was displaying the spinner, unresponsive to the remote and not recording.
Here's the debug log: Enigma2-25-07-2015_20-46-21.log
NOTE that the SIGSEGV signal at the end put the whole thing into a loop - it was generating the same signal ~200 times a second (from looking at the later debug log, which is just a series of repeating errors) until I logged into the box and rebooted it.