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I think, that the log file permissions are too weak in moment, this helps:

tfoerste@t44 ~/devel/tor $ cat /tmp/log640.patch
diff --git a/src/common/log.c b/src/common/log.c
index 5f7151b..f679336 100644
--- a/src/common/log.c
+++ b/src/common/log.c
@@ -1086,7 +1086,7 @@ add_file_log(const log_severity_list_t *severity, const char *filename,
   int open_flags = O_WRONLY|O_CREAT;
   open_flags |= truncate_log ? O_TRUNC : O_APPEND;
 
-  fd = tor_open_cloexec(filename, open_flags, 0644);
+  fd = tor_open_cloexec(filename, open_flags, 0640);
   if (fd<0)
     return -1;
   if (tor_fd_seekend(fd)<0) {