[Dovecot] Issues with VANISHED CHANGEDSINCE

[Michael J Rubinsky]

I've been seeing the following wonky behavior with Dovecot. Currently  
this is with Dovecot 2.0.19, but I was also seeing it in earlier  
versions as well, including versions from the 1.x series.  Some  
background, this is from Horde's ActiveSync library, when it is trying  
to determine what UIDs have recently been expunged.  I can guarantee  
that when this command was sent, there was only one or two emails that  
were removed since the provided MODSEQ value.

C: 8 UID FETCH 1:* UID (VANISHED CHANGEDSINCE 587742)
S: * VANISHED (EARLIER)  
1:119944,119947:123482,123484:128043,128045:130388,130390:130456,130458:132127,132129:135832,135834:136201,136203:136301,136303:136316,136318:138502,138504:140099,140101:141908,141910:142607,142609:142744,142746:142865,142867:143160,143164:143173,143176:143179,143181:143187,143189:143190,143192:143195,143197:143270,143272:143273,143275:143280,143282:143302,143305:143307,143309:143318,143320:143333,143335:143337,143339:143341,143343:143375,143377:143400,143402:143551,143553:143637,143640:143706,143708:144069,144071:144178,144180:144307,144309:144316,144318:144329,144331:144931,144933:144983,144985:145000,145002:145069,145071:145072,145074:145132,145136:145178,145180:145191,145193


Also, to verify it wasn't something screwy with my server, Michael  
Slusarz provided me with this from his server:

<quote>
There's definitely something wonky going on in the code.  There's a  
certain tipping point of modseqs where the values become incorrect.   
For a mailbox with HIGHESTMODSEQ of 54004, I see this:

a uid fetch 1:* UID (VANISHED CHANGEDSINCE 53881)
* VANISHED (EARLIER) 1:37308,37310:40788,40791:41032,41034:41083
a OK Fetch completed.
b uid fetch 1:* UID (VANISHED CHANGEDSINCE 53882)
* VANISHED (EARLIER) 41029:41030,41047:41083
b OK Fetch completed.
</quote>


Thanks for any guidance.
-- 
mike

The Horde Project (www.horde.org)
mrubinsk at horde.org
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