When TPX is using L-Serv, a potential hang condition may be observed.
This can occur if you are running the IBM z/OS diagnostic tool IGVDGNPP
TPX is a victim, not the cause.
Release : 5.4
Environment : TPX for Z/OS
Defect identified in L-Serv.
If L-Serv is used to share your TPX VSAM files then consider applying the new L-Serv solution LU16372.
This fixes a potential hang condition.