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How are zombies created ?
There are wide variety of reasons why a zombie is created.
The most common causes are due to user action:
- The node tree is deleted, replaced or reloaded whilst jobs are running
- A task is rerun, whilst in a submitted or active state
- A job is forced to new state, i.e. complete
More rarer causes might be:
- ecf script errors, where we have multiple calls to init and complete child command s
- The child command s in the ecf script are placed in the background. In this case, the order in which the child command contact the server, may be indeterminate.
- Load leveller submitting a job twice
- Server crash and recovered check point file is out of date
- Machine crash
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