So in Linux you got a message like,

Task Failed : Domain <SOAM>: session manager received in Session with ID <1201> for task with ID <1> from SIM with ID <d5fc1fae-ffff-ffff-c000-0011251e5277-1228-4852>, SIM process ID <28556>, Service with ID <d999e966-ffff-ffff-c000-000000000000-1461509040-28556>, Service process ID <28588>, executed on host <*******>, for Application <SampleAppCPP> which contains following error description <Domain <Application>: Service invoke call failed. The service process has exit unexpectedly with exit code: 11 State:Signalled. Check your service code.>. Check SIM log. Fix the application.

In such case, core file is dumped under Symphony DE work directory (normally $SOAM_HOME/work). You can backtrace the problem through debugging the core file with gdb.

If your application prestarts service, you can attach the service process to gdb, set breakpoint on onInvoke function inside your service code and step through.