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A chord completion function will raise the TimeoutError exception also if some/all of its group tasks have set: ignore_result=True
When the completion function fires it can’t find any results for the completed group tasks, therefore it assumes they have been cleared from the result backend due to a timeout.
It’s hard to tell without seeing your code if this is the case.
Anyway, make sure you don’t ignore results for the group tasks.
Source:stackexchange.com