Release : 19.0
Component : DMLO
This maybe an issue with the stack size is specified in the STKSIZE parameter of the USDTPARM macro.
First verify that you are using the 19.0 USDTPARM and also that the STKSIZE value is in the range is 4K - 16K.
CUSTOM.SRCLIB(USDTPARM)
> <...+....1....+....2....+....3....+....4....+....5....+....6....+....7..
000559 STKSIZE=4096 40 DEFAULT PUSH STACK SIZE
000560 *--------------------------------------------------------------------*