[Dovecot] mbox sync/lock issue, rc28 and later

Timo Sirainen tss at iki.fi
Fri Apr 6 20:36:27 EEST 2007

On 6.4.2007, at 20.08, Jeff A. Earickson wrote:

>> But what do you mean duplicated the messages? Same messages exist  
>> multiple times in the mbox file? The only reason I can think of  
>> how that could happen is if you expunged a lot of data from the  
>> middle of the mbox, and then in the middle of the move that  
>> external modification check cancelled the sync.
> That seems to be what happened.  I had marked a bunch of messages  
> as deleted,
> and had done "expunge" in Pine to trash them.  Then pine gave its  
> internal
> error.  Afterwords, most of the deleted messages were gone, some at  
> the
> end were not (not marked as deleted), and about 20 messages in the  
> middle
> of the mailbox were duplicated again at the end.  I think a new  
> message came
> in too.  Except for the duplication and the undeletes, no messages  
> were
> mangled.  I just had to re-delete some messages.
> After this odd behavior, I went looking for a core file (none), and  
> I checked
> my syslogs.  That is when I found the pile of messages about  
> "modified while
> syncing".  I found this message 1161 times in my syslogs since  
> March 28, 50
> times today.  Nobody has complained about anything though.

I guess this has something to do with NFS attribute caching then. For  
now you could disable the check by changing  
mbox_sync_file_is_ext_modified() to just contain "return FALSE;" in  

Hmm. Wonder if I should add a new setting for this or just disable  
the check completely for v1.0.. The reason why I added it in the  
first place was because I wanted to know if some mbox problems were  
caused by locking problems or real bugs in Dovecot. If the settings  
are correct it's a bit useless to do this check.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PGP.sig
Type: application/pgp-signature
Size: 186 bytes
Desc: This is a digitally signed message part
Url : http://dovecot.org/pipermail/dovecot/attachments/20070406/8303fd2d/attachment.pgp 

More information about the dovecot mailing list