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If tab completion using ast_module_helper is attempted during startup, deadlock will ensue because the CLI will attempt to lock the module list while it is already locked by the loader. This causes deadlock because when the loader tries to acquire the CLI lock, they are blocked on each other. Waiting for startup to complete is not feasible because the CLI lock is acquired while waiting, so deadlock will ensure regardless of whether or not a lock on the module list is attempted. To prevent deadlock, we immediately abort if tab completion is attempted on the module list before Asterisk is fully booted. ASTERISK-30039 #close Change-Id: Idd468906c512bb196631e366a8f597a0e2e9271d