I just ran into the same problem and wanted to add that the lock file was _not_ automatically unlinked on a restart. My hourly get-news cronjob failed for multiple days in a row.
Manually removing the lockfile fixed the stack-smash error, so thanks for pointing that out. Regards Christian -- ....Christian.Garbs....................................https://www.cgarbs.de "Verzeihung Herr Ober, wie komme ich zur Toilette?" "Immer der Nase nach!"