This error is reported when starting a webapp:

Jul 26 10:54:21 intel-corei7-64 kernel: audit: type=1400 audit(1564138461.831:7): lsm=SMACK fn=smack_inode_permission action=denied subject="User::App::webapps-falling-blocks" object="System" requested=rw pid=624 comm="web-runtime" name="wamsocket.lock" dev="tmpfs" ino=28322

The main WAM service has already created /tmp/wamsocket.lock during boot-up (path is not right, see SPEC-2684), but when we start a webapp, a new instance of the WebAppMgr binary is started (launcher process) with the webapp smack labels, which sets up the scene before handing control to the running WebAppMgr instance (browser process).

The launcher process probably tries to create the socket too but this is not possible due to its smack labels, hence the error message.