There are new PTFs available for z/VSE 5.1 and 5.2.
Let me start with the most critical one, which is also flagged as HIPER ("High Impact or Pervasive APAR"). It is related to Linux Fast Path (LFP).
VSE/AF - Connector - Linux Fast Path (LFP)
z/VSE 5.1 APAR PI35642 (UI25398), z/VSE 5.2 APAR PI35643 (PTF UI25399): DATA SEQUENCE ERROR WHEN USING Z/VSE FAST PATH TO LINUX ON SYSTEM Z
When using z/VSE Fast Path to Linux on System z (LFP) to send huge amounts of data from remote to z/VSE, parts of the data may arrive on z/VSE in a wrong sequence. This can happen under rare circumstances, for example when the IUCV message limit is reached due to heavy workload.
The Linux Fast Path Daemon (LFPD) has been corrected to ensure the correct data sequence.
VSE/AF - VSE Supervisor
z/VSE 5.1 APAR DY47596 (PTF UD54103), z/VSE 5.2 APAR DY47595 (PTF UD54097): HARDWAIT FFF DUE TO AN OPERATION EXCEPTION IN SGLOCK
HARDWAIT FFF due to an OPERATION EXCEPTION in the SGLOCK VSE Supervisor routine. SGLOCK is a macro that will be included into the VSE Supervisor during Supervisor generation. It provides the LOCK / UNLOCK Supervisor Service Call (SVC) VSE services.
SGLOCK and $IJBEQDQ have been changed to preserve Register 6.
Don't forget to apply the corresponding generation feature PTFs, if you generate your own Supervisor.
You will find both problems on our corrective service page too. It is here.