[NTG-context] Would Multiple Processes Cause: luatex: execution interrupted

I run context in a task queue with four worker processes. It is possible that context is invoked simultaneously to process distinct input files by tasks running in separate worker processes. I see periodic fatal errors, as follows: mtx-context | fatal error: no return code, message: luatex: execution interrupted However, the same input files can be processed by context directly without errors. Is it possible that context running in simultaneous but separate processes conflict? This is LuaTeX, Version beta-0.70.1-2011051923 (rev 4277) ConTeXt ver: 2011.05.18 18:04 MKIV fmt: 2011.7.2 int: english/english