Negative time values on LoadLeveler (FERMI) notification emails

Dear FERMI Users,
after a system upgrade some users are experiencing abnormal crash of their jobs.
The problem has been identified, but not yet solved. The problem occurs when more than one runjob command is executed simultaneously in the same batch script. The typical case is sub-blocking jobs.
This means that until the problem is not fixed you should not run these kind of jobs.
The problem can be detected in the LoadLeveler notification email if you find negative time values like these:
Job Step User Time: -24855 -3:-14:-8Job Step System Time: -24855 -3:-14:-8We apologise for the inconvenience.Best regards,
HPC User Support @ CINECA