2367366 - Diagnostics Agent does not start: ERROR => SfCreateShm: Shm in use by process <xxxx>

The Diagnostics Agent doesn't start. In the dev_jstart.new file, you can see an error like below:

I  [Thr 01] MtxInit: 30002 0 2
F  [Thr 01] *** ERROR => SfCreateShm: Shm in use by process 787224. [jsfxxshm_mt. 1277]
F  [Thr 01] *** ERROR => SfEStartupError: SfCInstanceManager::initShm: SfCreateShm failed (rc = 13 already in use)  [sfxxinst.hpp 406]
F  [Thr 01] *** ERROR => Operation failed: SfEStartupError: SfCInstanceManager::initShm: SfCreateShm failed (rc = 13 already in use) [sfxxmain_mt. 1186]
F 
F  ********************************************************************************
F  *** ERROR => Shared memory initialization failed.
F  ***
F  *** Please see section 'Instance initialization issues'
F  *** in SAP Note 1316652 for additional information and trouble shooting advice.
F  ********************************************************************************
F 
F  [Thr 01] *** LOG => exiting (exitcode -21001, retcode 2).

This process number changes from case to case.

Diagnostics Agent start-up.

Diagnostics Agent not starting Diagnostics Agent fails to start , KBA , SV-SMG-INS-DIA , Configuration of Root Cause Analysis related infrastructure , SV-SMG-DIA-SRV-AGT , Agent Framework , Problem