If you invoked ISPF in test/trace mode

ISPF passes control to TSO/E. A TSO/E error message is displayed and, if a SYSUDUMP, SYSABEND, or SYSMDUMP data set was preallocated, a dump is taken. To obtain more detailed failure-related information, see TSO/E messages for ISMF abends. For more information on allocating a dump data set and the dump format, see z/OS MVS JCL User's Guide and z/OS MVS JCL Reference.

Note: Test mode is set automatically any time you invoke the ISPF/PDF dialog test facility. It remains set until you exit from ISPF.