[Dovecot] Cached message size larger than expected

[Steven Haigh]

On 14/02/14 15:20, Steven Haigh wrote:
> Hi guys,
> 
> I recently turned on IMAP zlib compression for Maildir and noticed that
> I've started getting these errors in the maillog.
> 
> Error: Cached message size larger than expected (1627 > 1548)
> Error: Maildir filename has wrong S value, renamed the file from
> /home/crc.id.au/netwiz/.System Generated.Cron
> Jobs/cur/1392224150.M52270P1073.mail.crc.id.au,S=1627:2,S,Z to /home/crc.
> id.au/netwiz/.System Generated.Cron
> Jobs/cur/1392224150.M52270P1073.mail.crc.id.au,S=1627:2,S,Z
> Error: Corrupted index cache file /home/crc.id.au/netwiz/.System
> Generated.Cron Jobs/dovecot.index.cache: Broken physical size for mail
> UID 10916
> Error: read(zlib(/home/crc.id.au/netwiz/.System Generated.Cron
> Jobs/cur/1392224150.M52270P1073.mail.crc.id.au,S=1627:2,S,Z)) failed:
> Invalid argument
> Disconnected: Internal error occurred. Refer to server log for more
> information. [2014-02-14 15:08:20]
> 
> For these emails, I can no longer retrieve the contents of those
> messages in my mail client.
> 
> I noticed a thread similar to this for Dovecot 2.1.3 (or so) - however
> I'm getting the same on 2.2.12.
> 
> Has there been any solutions for this?

Looking further into this, it seems like the file has been compressed twice:

# file 1392222687.M581212P24455.mail.crc.id.au\,S\=2165\:2\,S\,Z
1392222687.M581212P24455.mail.crc.id.au,S=2165:2,S,Z: gzip compressed
data, was "1392222687.M581212P24455.mail.c", from Unix, last modified:
Thu Feb 13 03:31:27 2014, max compression

# gzip -l 1392222687.M581212P24455.mail.crc.id.au\,S\=2165\:2\,S\,Z
         compressed        uncompressed  ratio uncompressed_name
               2165                2084   0.1%
1392222687.M581212P24455.mail.crc.id.au,S=2165:2,S,Z

If I use the following, I get the actual body of the email content.
# gunzip -c 1392222687.M581212P24455.mail.crc.id.au\,S\=2165\:2\,S\,Z |
gunzip -c

This doesn't seem right for mail that has been sent, or moved from the
inbox to the trash folder...

Is it possible that when the mail is moved between folders, it is
somehow compressed a second time?

-- 
Steven Haigh

Email: netwiz at crc.id.au
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299

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