[Dovecot] ZFS Index corruption and Connection reset by peer

[Frank Bonnet]

On 06/08/2010 02:41 PM, Timo Sirainen wrote:
> On ti, 2010-06-08 at 14:20 +0200, Philippe Chevalier wrote:
> 
>> dovecot: IMAP(<user>@domain.org): Corrupted transaction log file /home/<user>/Mail/Maildir/INBOX/dovecot.index.log seq 13: record size too small +(type=0x0, offset=5560, size=0) (sync_offset=5652)
> ..
>> After some digging, I "solved" this problem with mmap_disable = yes in
>> dovecot.conf. Index corruption doesn't seem to occur anymore.
>>
>> Is this normal? I thought this problem occured only on NFS filesystem
>> and eventually on old versions of ZFS. Hasn't this been fixed?
> 
> Apparently it doesn't work perfectly..
> 
>> Is there an option in ZFS that would allow mmap calls without
>> corruption. Has it something to do with compression ?
> 
> I've no idea about ZFS.
> 
>> Other problem, that I have been unable to solve so far, is that a lot of
>> entries show up in my logs about :
>>
>> dovecot: imap-login: net_disconnect() failed: Connection reset by peer
> 
> This means close() failed with:
> 
> [ECONNRESET]	The underlying object was a stream socket that was
> 			shut down by the peer before all pending data was
> 			delivered.
> 
> This is the first time I've heard of this happening.. I see this shows
> up the first time in FreeBSD 6.3 man pages. Hmm. I don't like it. I
> guess I could work around it, but I think I'll first go complain about
> it to FreeBSD people.
> 

I get the same error messages at FreeBSD 7.2 ( many of them )

Jun 08 15:01:24 IMAP(xxxxxxxx): Error: close(client out) failed:
Connection reset by peer