[Dovecot] Still corrupt indexes in 1A4

[Alen Salamun]

Hi All!

I have done some more debugging now on actual problem. If I login as 
affected user and try to acces affected IMAP folder I get this in logs:

Nov  2 13:14:35 golem dovecot: imap(marko): Effective uid=543, gid=545
Nov  2 13:14:35 golem dovecot: imap(marko): maildir: 
data=/home/marko/Maildir
Nov  2 13:14:35 golem dovecot: imap(marko): maildir: 
root=/home/marko/Maildir, index=/home/marko/Maildir, control=, inbox=
Nov  2 13:14:35 golem dovecot: imap(marko): pool_system_malloc(): Out of 
memory
Nov  2 13:14:35 golem dovecot: child 26172 (imap) returned error 83 (Out 
of memory)

What is interesting is, that this imap child is frozen. If I try to 
access other folder it won't work anymore. If I kill this process 
everything works again in same session.

As mentioned before only thing that works is deleting dovecot-uidlist in 
affected folder!

BR,
Alen

Alen Salamun wrote:
> Hello All!
> 
> Well I still have users which almost daily get corrupt dovecot files in 
> their IMAP folders (Maildir style) and are unable to read their mail in 
> this particular folders. When I delete dovecot files in this folder (rm 
> -rf dove*) user can again read all messages.
> 
> This is regular Linux CentOS 4.2 with SAN storage (boot from SAN) as 
> disks. So this is EXT3 on LVM.
> 
> BUT it is VERY interesting that than happens only to two users which are 
> connected to the server via slow links (reading via Thunderbird or 
> Squirrelmail). It never happened (now for weeks) to other 10 users which 
> use it localy or at home (on speedy links).
> 
> It's very hard for me to exactly pinpoint the problem, since it never 
> happens to me.
> 
> But when it happened to one user again I asked him to send me 
> screenshoot of it. I could see there that SquirrelMail said:
> 
> "Warning: fgets() [function fgets]: SSL: fatal protocol error in 
> /usr/share/squirrelmail/functions/imap_general.php on line 93."
> 
> Examining this file this line is in function:
> 
> --------SQUIRRELMAIL PHP SOURCE------------
> /**
>  * Custom fgets function: gets a line from the IMAP server,
>  * no matter how big it may be.
>  * @param stream imap_stream the stream to read from
>  * @return string a line
>  */
> function sqimap_fgets($imap_stream) {
>     $read = '';
>     $buffer = 4096;
>     $results = '';
>     $offset = 0;
>     while (strpos($results, "\r\n", $offset) === false) {
>         if (!($read = fgets($imap_stream, $buffer))) {<- THIS IS LINE 93
>         /* this happens in case of an error */
>         /* reset $results because it's useless */
>         $results = false;
>             break;
>         }
>         if ( $results != '' ) {
>             $offset = strlen($results) - 1;
>         }
>         $results .= $read;
>     }
>     return $results;
> }
> }
> -------------------------------------------
> 
> Looks like dovecot drops connection or something. Well must be related 
> to corrupt dovecot files in particular folder, since deleting them 
> solves the problem.
> 
> BR,
> Alen Salamun