Even more diagnostic messages for bug 28223.

Try to figure out _where exactly_ we are first encountering NULs in
microdescriptors, and what we are doing when that happens.

1 files changed, 16 insertions, 1 deletions

diff --git a/src/feature/dirparse/microdesc_parse.c b/src/feature/dirparse/microdesc_parse.c
index 5a75af3994..1e26901ce8 100644
--- a/src/feature/dirparse/microdesc_parse.c
+++ b/src/feature/dirparse/microdesc_parse.c
@@ -159,7 +159,22 @@ microdescs_parse_from_string(const char *s, const char *eos,
 
     if (tokenize_string(area, s, start_of_next_microdesc, tokens,
                         microdesc_token_table, flags)) {
-      log_warn(LD_DIR, "Unparseable microdescriptor");
+      const char *location;
+      switch (where) {
+        case SAVED_NOWHERE:
+          location = "download or generated string";
+          break;
+        case SAVED_IN_CACHE:
+          location = "cache";
+          break;
+        case SAVED_IN_JOURNAL:
+          location = "journal";
+          break;
+        default:
+          location = "unknown location";
+          break;
+      }
+      log_warn(LD_DIR, "Unparseable microdescriptor found in %s", location);
       goto next;
     }