Inconsistency in map index with dovecot v2.3.21

John Alex.

14 Jan 2024 14 Jan '24

2:23 p.m.

Hi,

since I upgraded dovecot to version 2.3.21 on a FreeBSD 13.2 system, I've been seeing a few occurences of the following warnings daily:

Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox /var/vmail/users/user1/mdbox/storage: Inconsistency in map index (5,40 != 5,56) Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking index file /var/vmail/users/user1/mdbox/storage/dovecot.map.index Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox /var/vmail/users/user1/mdbox/storage: rebuilding indexes Jan 11 13:13:26 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking index file /var/vmail/users/user1/mdbox/storage/dovecot.map.index

The numbers in parentheses seem to always be of the format (x,40 != x,56) or (x,40 != x,72).

I also get such errors on some users when purging (doveadm-purge fails with error 75):

doveadm(user2): Warning: mdbox /var/vmail/users/user2/mdbox/storage: Inconsistency in map index (5,40 != 5,72) doveadm(user2): Warning: fscking index file /var/vmail/users/user2/mdbox/storage/dovecot.map.index doveadm(user2): Warning: mdbox /var/vmail/users/user2/mdbox/storage: rebuilding indexes doveadm(user2): Error: Purging namespace '' failed: BUG: Unknown internal error

If I rerun doveadm purge for this user it completes successfully.

Can anyone shed some light on what might be causing these messages? I didn't have these with 2.3.20. Should I be worried about data loss due to these index inconsistencies?

Show replies by date

caio＠skymail.com.br

9 Feb 9 Feb

1:07 p.m.

I have the same problem after updating dovecot 2.3.21, I am receiving the errors below for the accounts when I perform backups.

doveadm(user@user.com.br): Error: Purging namespace '' failed: BUG: Unknown internal error Error: failed sync dir: doveadm(user2@user2.com.br): Warning: mdbox /data/data/mailboxbackup/20240207/user2.com.br/u/ser/user2.com.br/mdbox/storage: Inconsistency in map index (42,40 != 42,56) doveadm(user2@user2.com.br): Warning: fscking index file /data/data/mailboxbackup/20240207/user2.com.br/u/ser/user2/mdbox/storage/dovecot.map.index doveadm(user2@user2.com.br): Warning: mdbox /data/data/mailboxbackup/20240207/user2.com.br/u/ser/user2.com.br/mdbox/storage: rebuilding indexes doveadm(user2@user2.com.br): Warning: Transaction log file /data/data/mailboxbackup/20240207/user2.com.br/u/ser/user2/mdbox/storage/dovecot.map.index.log was locked for 284 seconds (mdbox storage rebuild) doveadm(user2@user2.com.br): Error: Purging namespace '' failed: BUG: Unknown internal error

As in the case of our friend the other day, the error no longer happens on the same account, it happens on another random one.

Timo Sirainen

10 Feb 10 Feb

8:24 a.m.

On 12. Jan 2024, at 9.37, John Alex. via dovecot <dovecot@dovecot.org> wrote:

...

Hi,

since I upgraded dovecot to version 2.3.21 on a FreeBSD 13.2 system, I've been seeing a few occurences of the following warnings daily:

Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox /var/vmail/users/user1/mdbox/storage: Inconsistency in map index (5,40 != 5,56) Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking index file /var/vmail/users/user1/mdbox/storage/dovecot.map.index Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox /var/vmail/users/user1/mdbox/storage: rebuilding indexes Jan 11 13:13:26 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking index file /var/vmail/users/user1/mdbox/storage/dovecot.map.index

Hmm. I can't seem to be able to reproduce it easily at least. Looking at the code changes, I do see now that there is one related change that may be wrong, or at least the commit message is wrong: https://github.com/dovecot/core/commit/aae93d3ea73004ba1883bbf91c9e40f613ffc... - although it shouldn't affect anything unless there are already some other errors. But maybe there's something I don't see right now. Can you try if the errors go away by reverting this change?

...

Should I be worried about data loss due to these index inconsistencies?

No data loss, but it can lead to inefficient rebuilds.

Oscar del Rio

13 Feb 13 Feb

11:07 p.m.

On 2024-02-10 2:24 a.m., Timo Sirainen wrote:

...

On 12. Jan 2024, at 9.37, John Alex. via dovecot<dovecot@dovecot.org> wrote:

...
since I upgraded dovecot to version 2.3.21 on a FreeBSD 13.2 system, I've been seeing a few occurences of the following warnings daily:

Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox /var/vmail/users/user1/mdbox/storage: Inconsistency in map index (5,40 != 5,56) Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking index file /var/vmail/users/user1/mdbox/storage/dovecot.map.index Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox /var/vmail/users/user1/mdbox/storage: rebuilding indexes Jan 11 13:13:26 dimokritos dovecot[33170]: lmtp(user1)<8209><SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking index file /var/vmail/users/user1/mdbox/storage/dovecot.map.index Hmm. I can't seem to be able to reproduce it easily at least. Looking at the code changes, I do see now that there is one related change that may be wrong, or at least the commit message is wrong:https://github.com/dovecot/core/commit/aae93d3ea73004ba1883bbf91c9e40f613ffc... - although it shouldn't affect anything unless there are already some other errors. But maybe there's something I don't see right now. Can you try if the errors go away by reverting this change?

I reinstalled 2.3.21 from source (originally was using Dovecot repo packages) and tested by reverting that commit. The warnings continued.

Next I tried with Dovecot 2.3.20 and still got the same warnings after a while.

# 2.3.20 (80a5ac675d): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.20 (149edcf2) # OS: Linux 5.4.0-171-generic x86_64 Ubuntu 20.04.6 LTS nfs4

Feb 13 15:38:25 dovecot: imap-login: Login: user=<username>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=272469, TLS, session=<t+48YEkRrrN/AAAB> Feb 13 15:38:27 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Warning: mdbox /mail/spool/username/storage: Inconsistency in map index (3,40 != 3,56) Feb 13 15:38:27 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Warning: fscking index file /mail/spool/username/storage/dovecot.map.index Feb 13 15:38:27 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Warning: mdbox /mail/spool/username/storage: rebuilding indexes Feb 13 15:38:29 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Error: Mailbox INBOX: /mail/spool/username/mailboxes/INBOX/dbox-Mails/dovecot.index reset, view is now inconsistent Feb 13 15:38:29 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Warning: fscking index file /mail/spool/username/storage/dovecot.map.index

I will try with an even older version to continue testing...

On 2024-02-10 2:24 a.m., Timo Sirainen wrote: On 12. Jan 2024, at 9.37, John Alex. via dovecot <dovecot@dovecot.org> wrote: since I upgraded dovecot to version 2.3.21 on a FreeBSD 13.2 system, I've been seeing a few occurences of the following warnings daily:

      Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp
      (user1)&lt;8209>&lt;SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox /
      var/vmail/users/user1/mdbox/storage: Inconsistency in map
      index (5,40 != 5,56)
      Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp
      (user1)&lt;8209>&lt;SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking
      index file /var/vmail/users/user1/mdbox/storage/
      dovecot.map.index
      Jan 11 13:13:25 dimokritos dovecot[33170]: lmtp
      (user1)&lt;8209>&lt;SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: mdbox /
      var/vmail/users/user1/mdbox/storage: rebuilding indexes
      Jan 11 13:13:26 dimokritos dovecot[33170]: lmtp
      (user1)&lt;8209>&lt;SId/BlXNn2URIAAA+iYuTQ:T2>: Warning: fscking
      index file /var/vmail/users/user1/mdbox/storage/
      dovecot.map.index
 Hmm. I can't seem to be able to reproduce it easily at least. Looking
 at the code changes, I do see now that there is one related change
 that may be wrong, or at least the commit message is wrong: https://
 github.com/dovecot/core/commit/
 aae93d3ea73004ba1883bbf91c9e40f613ffc857 - although it shouldn't
 affect anything unless there are already some other errors. But maybe
 there's something I don't see right now. Can you try if the errors go
 away by reverting this change?

We are getting the same warnings on 2 separate test servers; one with local ZFS storage, the other one with NFS storage (single server, data not shared with any other servers). We are imapsync'ing a few hundred user accounts from the production server so there is a lot of emails transfer a day. The warnings occur at random times and with random users. I reinstalled 2.3.21 from source (originally was using Dovecot repo packages) and tested by reverting that commit. The warnings continued. Next I tried with Dovecot 2.3.20 and still got the same warnings after a while. # 2.3.20 (80a5ac675d): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.20 (149edcf2) # OS: Linux 5.4.0-171-generic x86_64 Ubuntu 20.04.6 LTS nfs4 Feb 13 15:38:25 dovecot: imap-login: Login: user=<username>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=272469, TLS, session=<t+48YEkRrrN/AAAB> Feb 13 15:38:27 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Warning: mdbox /mail/spool/username/storage: Inconsistency in map index (3,40 != 3,56) Feb 13 15:38:27 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Warning: fscking index file /mail/spool/username/storage/dovecot.map.index Feb 13 15:38:27 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Warning: mdbox /mail/spool/username/storage: rebuilding indexes Feb 13 15:38:29 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Error: Mailbox INBOX: /mail/spool/username/mailboxes/INBOX/dbox-Mails/dovecot.index reset, view is now inconsistent Feb 13 15:38:29 dovecot: imap(username)<272469><t+48YEkRrrN/AAAB>: Warning: fscking index file /mail/spool/username/storage/dovecot.map.index I will try with an even older version to continue testing...

Oscar del Rio

11:19 p.m.

Apologies for the formatting. Retrying with HTML formatting disabled:

I reinstalled 2.3.21 from source (originally was using Dovecot repo packages) and tested by reverting that commit. The warnings continued.

Next I tried with Dovecot 2.3.20 and still got the same warnings after a while.

# 2.3.20 (80a5ac675d): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.20 (149edcf2) # OS: Linux 5.4.0-171-generic x86_64 Ubuntu 20.04.6 LTS nfs4

I will try with an even older version to continue testing...

322

Age (days ago)

352

Last active (days ago)

List overview

4 comments

4 participants

participants (4)

caio＠skymail.com.br
John Alex.
Oscar del Rio
Timo Sirainen