[squid-users] Warning about "Invalid entries" in cache.log (rock-store)

[Tom Tom]

Hi

I'm running Squid 3.5.11 (Linux, 64Bit) with 16 workers and 4
cache_dir's (rock) configured.

The 4 rock-caches where newly builded a few days ago. In the meantime,
during squid-startup, I receive warnings like this:
...
...
2015/11/26 00:07:41 kid17| WARNING: Ignoring malformed cache entry.
2015/11/26 00:07:41 kid17| WARNING: Ignoring malformed cache entry.
2015/11/26 00:07:41 kid17| WARNING: Ignoring malformed cache entry.
2015/11/26 00:07:41 kid17| WARNING: Ignoring malformed cache entry.
2015/11/26 00:07:41 kid17| WARNING: Ignoring malformed cache entry.
2015/11/26 00:07:42 kid17| Finished rebuilding storage from disk.
2015/11/26 00:07:42 kid17|   2879999 Entries scanned
2015/11/26 00:07:42 kid17|      1092 Invalid entries.
2015/11/26 00:07:42 kid17|         4 With invalid flags.
2015/11/26 00:07:42 kid17|    158845 Objects loaded.
2015/11/26 00:07:42 kid17|         0 Objects expired.
...
...


How critical are the "Invalid entries"? What's the reason for these?

Thanks a lot.
Kind regards,
Tom