Description:
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When the user simply calls ->do on a GearmanClient, the context member of the task structure will be set to the client structure - and not to the assumed gearman_task_obj structure.

This leads to an invalid efree() in _php_free_task when the number of received bytes causes the correct bit to be set (the ->do_data_size from client will be used when referring to ->flags of obj).

As the gearman_task_obj never gets created when a simple do is called, it seems that there's no need to clean it up either. The patch simply checks if the context is the same as the client of the task, and if so, just returns without doing the call to free.

Patch:
http://e-mats.org/resources/php_gearman.c.patch