Resolution:
If native code running on an Engine fails (in the sense that it is terminated by the operating system), a temporary file recording the message generated by the failure is written in the Engine installation directory. Upon startup, Engine instances will check for the existence of such a file, and, if it is found, will report its contents to the Manager, which will print them in the log.

Common messages include:
"Segmentation fault" (on UNIX Engines)
"ACCESS VIOLATION" (on Windows Engines)