dovecot and broken uidlist

Maciej Milaszewski
Thu, 28 Jan 2021 16:14:53 -0000

Hi
For test I crete a new director with 2.3.13 and node 2.3.13 I mount
storage via nfs with this same options:

rw,sec=sys,noexec,noatime,tcp,hard,rsize=65536,wsize=65536,intr,nordirplus,nfsvers=3,tcp,actimeo=120

I create a simple MTA and change MX to thi same like director1

In kernel 5.8.0-0.bpo.2-amd64 problem exists
In kernel 3.x - not exists

In problem exists I check Maildir/dovecot-uidlist

3 V1424432537 N16208 G92c4ee0d93aa1260c629000009c4ba82
16144 :1611352119.M505834P25597.dovecot2,S=18282,W=18620
16145 :1611352123.M269121P19872.dovecot2,S=18266,W=18604
16146 :1611762747.M502108P9747.dovecot7,S=6595,W=6726
16150 :1611835594.M756718P9986.dovecot7,S=62439,W=63817
16163 :1611828091.M231204P5202.dovecot7,S=19348,W=19855
16208 :1611849420.M137743P24417.dovecot7,S=12064,W=12296
16209 :1611828091.M144806P5202.dovecot7,S=2806,W=2865
16210 :1611837438.M678475P12027.dovecot7,S=17713,W=18072
16211 :1611757939.M493064P7136.dovecot7,S=30783,W=31520
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@$

If not exists:

16144 :1611352119.M505834P25597.dovecot2,S=18282,W=18620
16145 :1611352123.M269121P19872.dovecot2,S=18266,W=18604
16146 :1611762747.M502108P9747.dovecot7,S=6595,W=6726
16150 :1611835594.M756718P9986.dovecot7,S=62439,W=63817
16163 :1611828091.M231204P5202.dovecot7,S=19348,W=19855
16208 :1611849420.M137743P24417.dovecot7,S=12064,W=12296
16209 :1611828091.M144806P5202.dovecot7,S=2806,W=2865
16210 :1611837438.M678475P12027.dovecot7,S=17713,W=18072
16211 :1611757939.M493064P7136.dovecot7,S=30783,W=31520

On 23.01.2021 00:59, Alessio Cecchi wrote:
>
> Hi,
>
> after some tests I notice a difference in dovecot-uidlist line format
> when message is read from "old kernel" and "new
kernel":
>
> 81184 G1611334252.M95445P32580.mail05.myserver.com
> :1611334252.M95445P32580.mail05.myserver.com,S=38689,W=39290
> 81185 G1611336004.M47750P3921.mail01.myserver.com
> :1611336004.M47750P3921.mail01.myserver.com,S=15917,W=16212
> 81186 G1611338535.M542784P10852.mail03.myserver.com
> :1611338535.M542784P10852.mail03.myserver.com,S=12651,W=12855
> 81187 G1611341375.M164702P13505.mail01.myserver.com
> :1611341375.M164702P13505.mail01.myserver.com,S=8795,W=8964
> 81189 G1611354389.M984432P14754.mail06.myserver.com
> :1611354389.M984432P14754.mail06.myserver.com,S=3038,W=3096
> 81191 :1611355746.M365669P10402.mail03.myserver.com,S=3049,W=3107
> 81193 :1611356442.M611719P20778.mail01.myserver.com,S=1203,W=1230
> 81194 G1611356752.M573233P27082.mail01.myserver.com
> :1611356752.M573233P27082.mail01.myserver.com,S=1210,W=1238
> 81195 G1611356991.M905681P30704.mail01.myserver.com
> :1611356991.M905681P30704.mail01.myserver.com,S=1220,W=1249
> 81197 :1611357210.M42178P1962.mail01.myserver.com,S=1220,W=1250
> 81199 :1611357560.M26894P7157.mail01.myserver.com,S=1233,W=1264
>
> With "old kernel" (where all works fine) UID number are
incremental
> and in the line there is one more field that start with
"G1611...".
>
> With "new kernel" (where error comes) UID number skip always a
number
> and the field "G1611..." is missing.
>
> Maciej, do you also have this behavior?
>
> Why Dovecot create different uidlist line format with different kernel?
>
> Il 22/01/21 17:50, Maciej Milaszewski ha scritto:
>> Hi
>> I using pop/imap and LMTP via director and user go back in dovecot node
>>
>> Current: 10.0.100.22 (expires 2021-01-22 17:42:44)
>> Hashed: 10.0.100.22
>> Initial config: 10.0.100.22
>>
>> I have 6 dovecot backands and index via local ssd disk
>> mail_location = maildir:~/Maildir:INDEX=/var/dovecot_indexes%h
>>
>> user never log in two different nodes in this same time
>>
>> I update debian from 8 to 9 (and to 10) and tested via kerlnel 4.x and
>> 5.x and problem exists
>> If I change kernel to 3.16.x problem not exists
>> I tested like:
>>
>> problem exists:
>> dovecot1-5 with 4.x
>> and
>> dovecot1-4 - with 3.19.x
>> dovecot5 - with 4.x
>> and
>> dovecot1-5 - with 5.x
>> and
>> dovecot1-4 - with 4.x
>> dovecot5 - with 5.x
>>
>> not exists:
>> dovecot1-5 - with 3.19.x
>>
>> not exists:
>> dovecot1-5 - with 3.19.x+kernel-care
>>
>> I use NetAPP with mount options:
>>
rw,sec=sys,noexec,noatime,tcp,soft,rsize=32768,wsize=32768,intr,nordirplus,nfsvers=3,actimeo=120
>> I try with nocto and without nocto
>>
>> big guys from NetApp says "nfs 4.x need auth via kerberos
...."
>>
>>
>>
>> On 22.01.2021 16:08, Alessio Cecchi wrote:
>>> Hi Maciej,
>>>
>>> I'm using LDA for delivery email in mailbox (Maildir) and I
>>> think(hope) that switching to LMTP via director will fix my
problem,
>>> but I d'ont know why wiht old kernel works and with recent no.
>>>
>>> Are you using POP/IMAP and LMTP via director so any update to
dovecot
>>> indexes is done from the same server?
>>>
>>> Il 19/01/21 16:22, Maciej Milaszewski ha scritto:
>>>> Hi
>>>> I use lmtp and you ?
>>>>
>>>> On 19.01.2021 10:45, Alessio Cecchi wrote:
>>>>> Hi Maciej,
>>>>>
>>>>> I had the same issue when I switched dovecot backend from
Cento 6 to
>>>>> Centos 7.
>>>>>
>>>>> Also my configuration is similar to you, Dovecot Direcot,
Dovecot
>>>>> backend that share Maildir via NFS on NetApp.
>>>>>
>>>>> For local delivery of emails are you using LDA or LMTP?
I'm using LDA.
>>>>>
>>>>> Let me know.
>>>>>
>>>>> Thanks
>>>>>
>>>>> Il 13/01/21 15:56, Maciej Milaszewski ha scritto:
>>>>>> Hi
>>>>>> I have been trying resolve my problem with dovecot for
a few days and I
>>>>>> dont have idea....
>>>>>>
>>>>>> My environment is: dovecot director+5 dovecot guest
>>>>>>
>>>>>> dovecot-2.2.36.4 from source
>>>>>> Linux 3.16.0-11-amd64
>>>>>> storage via nfs (NetApp)
>>>>>>
>>>>>> all works fine but when I update OS from debian 8
(kernel 3.16.x) to
>>>>>> debian 9 (kernel 4.9.x ) sometimes I get random in
logs:
>>>>>> Broken dovecot-uidlist
>>>>>>
>>>>>> examle:
>>>>>> Error: Broken file
>>>>>>
/vmail2/po/pollygraf.xxx_pg_pollygraf/Maildir/dovecot-uidlist line 88:
>>>>>> Invalid data:
>>>>>>
>>>>>> (for random users - sometimes 10 error in day per node,
some times more)
>>>>>>
>>>>>> File looks ok
>>>>>>
>>>>>> But if I change kernel to 3.16.x problem with
"Broken file
>>>>>> dovecot-uidlist"? - not exists
>>>>>> if turn to 4.9 or 5.x - problem exists
>>>>>>
>>>>>> I have storage via nfs with opions:
>>>>>>
rw,sec=sys,noexec,noatime,tcp,hard,rsize=65536,wsize=65536,intr,nordirplus,nfsvers=3,tcp,actimeo=120
>>>>>> I tested with "nocto" or without
"nocto" - nothing changes ......
>>>>>>
>>>>>> nfs options in node:
>>>>>> mmap_disable = yes
>>>>>> mail_fsync = always
>>>>>>
>>>>>> I bet the configuration is correct and I wonder why the
problem occurs
>>>>>> with other kernels
>>>>>> 3.x.x - ok
>>>>>> 4.x - not ok
>>>>>>
>>>>>> I check and user who have problem did not connect to
another node in
>>>>>> this time
>>>>>>
>>>>>> I dont have idea why problem exists on the kernel 4.x
but not in 3.x
>>>>>>
>>>>>>
>>>>> --
>>>>> Alessio Cecchi
>>>>> Postmaster @ http://www.qboxmail.it
>>>>> https://www.linkedin.com/in/alessice
>>> --
>>> Alessio Cecchi
>>> Postmaster @ http://www.qboxmail.it
>>> https://www.linkedin.com/in/alessice

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