Don't crash on most common gen_server:call errors

src/ejabberd_sql.erl

@@ -580,8 +580,13 @@ sql_query_internal(#sql_query{} = Query) ->
                 sqlite ->
                     sqlite_sql_query(Query)
             end
-        catch
-            Class:Reason ->
+        catch exit:{timeout, _} ->
+		{error, <<"timed out">>};
+	      exit:{killed, _} ->
+		{error, <<"killed">>};
+	      exit:{normal, _} ->
+		{error, <<"terminated unexpectedly">>};
+	      Class:Reason ->
                 ST = erlang:get_stacktrace(),
                 ?ERROR_MSG("Internal error while processing SQL query: ~p",
                            [{Class, Reason, ST}]),

src/mod_stream_mgmt.erl

@@ -682,6 +682,8 @@ inherit_session_state(#{user := U, server := S,
 			    {error, <<"Previous session PID is dead">>};
 			  exit:{normal, _} ->
 			    {error, <<"Previous session PID has exited">>};
+			  exit:{killed, _} ->
+			    {error, <<"Previous session PID has been killed">>};
 			  exit:{timeout, _} ->
 			    ejabberd_sm:close_session(OldSID, U, S, R),
 			    ejabberd_c2s:stop(OldPID),