On 12. Jan 2024, at 9.37, John Alex. via dovecot <dovecot@dovecot.org> wrote:
> 
> Hi,
> 
> since I upgraded dovecot to version 2.3.21 on a FreeBSD 13.2 system, I've 
> been seeing a few occurences of the following warnings daily:
> 
> Jan 11 13:13:25 dimokritos dovecot[33170]: 
> lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox 
> /var/vmail/users/user1/mdbox/storage: Inconsistency in map index (5,40 != 
> 5,56)
> Jan 11 13:13:25 dimokritos dovecot[33170]: 
> lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking index file 
> /var/vmail/users/user1/mdbox/storage/dovecot.map.index
> Jan 11 13:13:25 dimokritos dovecot[33170]: 
> lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox 
> /var/vmail/users/user1/mdbox/storage: rebuilding indexes
> Jan 11 13:13:26 dimokritos dovecot[33170]: 
> lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking index file 
> /var/vmail/users/user1/mdbox/storage/dovecot.map.index

Hmm. I can't seem to be able to reproduce it easily at least. Looking at the 
code changes, I do see now that there is one related change that may be wrong, 
or at least the commit message is wrong: 
https://github.com/dovecot/core/commit/aae93d3ea73004ba1883bbf91c9e40f613ffc857 
- although it shouldn't affect anything unless there are already some other 
errors. But maybe there's something I don't see right now. Can you try if the 
errors go away by reverting this change?

> Should I be worried about data loss due to these index inconsistencies?

No data loss, but it can lead to inefficient rebuilds.
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