- client: if a job's finish file has been there > 10 sec,

do atp->abort_task() rather than atp->kill_task();
    the latter will restart it infinitely on Unix
- client: prefix timestamp to stderr messages

client/app_control.cpp

@@ -121,7 +121,7 @@ bool ACTIVE_TASK_SET::poll() {
     }
 
     // Check for finish files every 10 sec.
-    // If we already found a finish file, kill the app;
+    // If we already found a finish file, abort the app;
     // it must be hung somewhere in boinc_finish();
     //
     static double last_finish_check_time = 0;
@@ -131,7 +131,9 @@ bool ACTIVE_TASK_SET::poll() {
             ACTIVE_TASK* atp = active_tasks[i];
             if (atp->task_state() == PROCESS_UNINITIALIZED) continue;
             if (atp->finish_file_time) {
-                atp->kill_task(false);
+                // process is still there 10 sec after it wrote finish file.
+                // abort the job
+                atp->abort_task(EXIT_ABORTED_BY_CLIENT, "finish file present too long");
             } else if (atp->finish_file_present()) {
                 atp->finish_file_time = gstate.now;
             }

client/main.cpp

@@ -110,8 +110,8 @@ void log_message_error(const char* msg) {
     );
 #else
     snprintf(evt_msg, sizeof(evt_msg),
-        "%s\n",
-        msg
+        "%s %s\n",
+        time_string, msg
     );
 #endif
     if (!gstate.executing_as_daemon) {