Corruption of index files

Hi All,

after upgrading my mail server (dovecot 1.1.7 -> 2.2.13) I get tons of messages about corrupted index files in the syslog ("Error: Corrupted transaction log" and "Warning: fscking index file .. dovecot.index".

I tried flock and even dotlock, but the problems persist.

The system is a VPS with an overlay filesystem which did work flawlessly with the old dovecot install and is not reporting any errors in the host machine.

From time to time I get warnings about an exceeded inotify limit for the dovecot user - might this be a problem? Anybody has an idea what might be the cause those problems and how to track them down.

Oliver

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