When External Security Manager tracing is enabled, and when ES is under load, CASTMC may crash with RTS114 on dfh0msg:

230307 11401005      34830 XXXX     CASSP0014S Process termination due to RTS error.
Execution error : file 'dfh0msg'
error code: 114, pc=0, call=1, seg=0
114     Attempt to access item beyond bounds of memory (Signal 11) 11:40:10
230307 11401015                     CASCD1049S IMS TM Control Process for Server DIMS exited with value 0000000255 11:40:10
230307 11401016      39940 XXXX     CASSP0002I Server manager informed of process termination, pinfo =  W,0000034830 11:40:10

Full article: https://portal.microfocus.com/s/article/KM000015866