o split log_init() in slurmd_job_log_init() into a log_alter() and

  log_set_argv0() to avoid reinitializing the log mutex.
  This avoids spurious debug messages on job stderr when default stderr
  logging is high (a rare but annoying bug)

src/slurmd/mgr.c

@@ -1053,21 +1053,22 @@ _slurmd_job_log_init(slurmd_job_t *job)
 	 */
 	conf->log_opts.stderr_level = LOG_LEVEL_ERROR + job->debug;
 
+	snprintf(argv0, sizeof(argv0), "slurmd[%s]", conf->hostname);
+
+	/* 
+	 * reinitialize log 
+	 */
+	log_alter(conf->log_opts, 0, NULL);
+	log_set_argv0(argv0);
+
 	/* Connect slurmd stderr to job's stderr */
 	if (dup2(job->task[0]->perr[1], STDERR_FILENO) < 0) {
 		error("job_log_init: dup2(stderr): %m");
 		return;
 	}
+}
 
-	fd_set_nonblocking(STDERR_FILENO);
-
-	snprintf(argv0, sizeof(argv0), "slurmd[%s]", conf->hostname);
 
-	/* 
-	 * reinitialize log 
-	 */
-	log_init(argv0, conf->log_opts, 0, NULL);
-}
 
 
 /*