If you have problems loading a core file, check whether you have a truncated core file. If you have the maximum allowable size of core files set too low when the core file is created, then dbx cannot read the resulting truncated core file. In the C shell, you can set the maximum allowable core file size using the limit command (see the limit(1) man page). In the Bourne shell and Korn shell, use the ulimit command (see the limit(1) man page). You can change the limit on core file size in your shell startup file, re-source the startup file, and then rerun the program that produced the core file to produce a complete core file.
If the core file is incomplete, and the stack segment is missing, then stack trace information is not available. If the runtime linker information is missing, then the list of load objects is not available. In this case, you get an error message about librtld_db.so not being initialized. If the list of light weight processes (LWPs) is missing, then no thread information, LWP information, or stack trace information is available. If you run the where command, you get an error saying the program was not active.