Hi all,
This issue happens due to a Deadlock. The JAVA processes are hanging and during the execution of GETSYNC methods the ABAP task that executed this method goes to blocked mode waiting for JAVA to write on the SYNC.DAT file (that works as sincronization checkpoint log). However, as I said JAVA is hanging and nothing will be written. Now both stacks upgrade are hanging.
I solved this issue in a way that is not recommended (in my case the system being updated was just a test system being used only for me). However it worked just fine. So here it goes, I manually wrote on the SYNC file what the GETSYNC method wanted to read. After the ABAP stack upgrade was finished I restarted the the upgrade only for the java stack though the flag -javaonly.
You have to make sure the event has sucessufully finished checking the log of the ABAP task being performed and adding the following line in the SYNC file:
V1: TOOL=SAPup EVENT=<EVENT_NAME> STATUS FINISHED
I think in your case the event is called SCS. It is very likely this problem will happen with other getsync methods so be prepared to edit this file more than once.
Hope it helps,
Hyago Sallet.