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 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 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