Am 06.03.23 um 16:45 schrieb Aki Tuomi:

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On 06/03/2023 16:52 EET Tim Evers <te-ml-ext@artfiles.de> wrote:

Am 06.03.23 um 15:29 schrieb Aki Tuomi:

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On 06/03/2023 15:56 EET Tim Evers <te-ml-ext@artfiles.de> wrote:

Am 06.03.23 um 14:49 schrieb Aki Tuomi:

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On 06/03/2023 15:45 EET Tim Evers <te-ml-ext@artfiles.de> wrote:

Am 06.03.23 um 14:00 schrieb Aki Tuomi: >> On 06/03/2023 13:06 EET Tim Evers <te-ml-ext@artfiles.de> wrote: >> >>
>> Am 06.03.23 um 11:59 schrieb Aki Tuomi: >> >>>> On 06/03/2023 12:44 EET Tim Evers <te-ml-ext@artfiles.de> wrote: >>>> >>>>
>>>> Am 06.03.23 um 11:42 schrieb Aki Tuomi: >>>> >>>>>> On 06/03/2023 12:32 EET Tim Evers <te-ml-ext@artfiles.de> wrote: >>>>>> >>>>>>
>>>>>> Hi, >>>>>> >>>>>> since I did not get any feedback on my bug report post regarding >>>>>> corrupted sizes while using zlib >>>>>> (https://dovecot.org/pipermail/dovecot/2023-February/126105.html) I >>>>>> would like to confirm that this bug report reached someone in charge. >>>>>> >>>>>> Or if not - I would kindly ask for directions on how to post it in a way >>>>>> that spawns some action. >>>>>> >>>>>> Thx >>>>>> >>>>>> Tim >>>>> Can you try erasing dovecot.index.cache and see if the problem fixes itself? It's possible your cache contains invalid values from old errors. >>>>> >>>>> Aki >>>> Did that already several times (other dovecot.index.* files too). The >>>> only thing that helps is actually deleting the dovecot-uidlist file but >>>> the problem returns. >>>> >>>> Tim >>> I think it's because the value on the filename is wrong. The filename contains the virtual and physical size. >>> >>> Can you try if https://github.com/dovecot/tools/blob/main/maildir-size-fix.pl fixes your issue? >>> >>> Aki >> Quoting >> >> https://doc.dovecot.org/configuration_manual/zlib_plugin/ : >> >> "All mails must have ,|S=<size>|in their filename where <size> contains >> the original uncompressed mail size, otherwise there will be problems >> with quota calculation as well as other potential random failures." >> >> And the script you send: >> >> "# Check if the files are compressed. Use the uncompressed size for S=size." >> >> Which it does in my example. S= contains the uncompressed size, not the >> size on disk. Is this not correct? All Files are written exclusively by >> dovecot, no other software is involved. >> >> Tim > Can you send output from doveconf -n? I am having suspicion that zlib plugin isn't always involved in your config, which causes the compressed file to be cached wrongly. Especially it feels like your IMAP protocol does not have compression on while LMTP does. > > Aki Actually it is the other way round (I removed zlib from lmtp to reduce the impact of the problem):

2.3.20 (80a5ac675d): /etc/dovecot/dovecot.conf

Pigeonhole version 0.5.20 (149edcf2)

OS: Linux 4.15.0-204-generic x86_64 Ubuntu 18.04.6 LTS

Hostname: node2.mst27.artfiles.de

auth_verbose = yes auth_worker_max_count = 1000 default_client_limit = 5000 dict { sqlquota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext } disable_plaintext_auth = no import_environment = TZ CLUSTERNAME lda_mailbox_autocreate = yes lda_mailbox_autosubscribe = yes mail_location = maildir:~/Maildir mail_plugins = " mail_log notify old_stats" mailbox_idle_check_interval = 10 mins maildir_broken_filename_sizes = yes managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext editheader imapsieve vnd.dovecot.imapsieve namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = INBOX. separator = . } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { imapsieve_mailbox1_before = file:~/af_report-spam.sieve imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_name = INBOX.Junk imapsieve_mailbox2_before = file:~/af_report-ham.sieve imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_from = INBOX.Junk imapsieve_mailbox2_name = * quota = dict:User quota::proxy::sqlquota quota_rule = *:storage=0:messages=0 sieve = file:~/sieve;active=~/.dovecot.sieve sieve_before = file:~/af_master.sieve sieve_before2 = file:~/af_konto.sieve sieve_before3 = file:~/af_domain.sieve sieve_before4 = file:~/af_spamfilter.sieve sieve_extensions = +editheader sieve_filter_bin_dir = /usr/local/bin/sieve sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.filter +vnd.dovecot.environment sieve_max_redirects = 100 sieve_pipe_bin_dir = /usr/local/bin/sieve sieve_plugins = sieve_imapsieve sieve_extprograms stats_refresh = 30 secs zlib_save = gz zlib_save_level = 6 } pop3_no_flag_updates = yes protocols = " imap lmtp sieve pop3" service anvil { client_limit = 6203 } service auth-worker { process_limit = 1000 } service auth { client_limit = 6300 } service dict { process_limit = 500 unix_listener dict { group = vmail mode = 0600 user = vmail } } service imap-login { process_limit = 4000 process_min_avail = 0 service_count = 0 vsz_limit = 512 M } service imap { client_limit = 1 process_limit = 4000 vsz_limit = 1 G } service lmtp { inet_listener lmtp { address = 127.0.0.1 port = 10024 } process_limit = 80 process_min_avail = 20 vsz_limit = 2 G } service pop3-login { process_limit = 2000 service_count = 0 vsz_limit = 512 M } service pop3 { client_limit = 1 process_limit = 2000 vsz_limit = 1 G } service stats { fifo_listener stats-mail { mode = 0600 user = vmail } } ssl_cert = </etc/dovecot/private/dovecot.pem ssl_client_ca_dir = /etc/ssl/certs ssl_key = # hidden, use -P to show it submission_host = smtp4.artfiles.de syslog_facility = local5 userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } protocol lmtp { mail_plugins = " mail_log notify old_stats sieve quota" } protocol imap { mail_max_userip_connections = 50 mail_plugins = " mail_log notify old_stats quota imap_quota imap_sieve zlib imap_old_stats" rawlog_dir = /var/log/rawlog/%u } protocol pop3 { mail_max_userip_connections = 50 mail_plugins = " mail_log notify old_stats zlib" } It will probably compound on the issue though, especially when rebuilding caches and indexes, as it will record the sizes wrong. I'm not sure if this is *really* the issue, but it's most likely culprit. The 8192 is very odd number to have there, which either indicates that the zlib plugin is not consistently used, or you have some issues with the gz library itself.

Aki Not sure if I understand this - shouldn't dovecot always note the decompressed size in cache and filename regardless if it's compressed or not?

I just removed the zlib plugin from lmtp to reduce the footprint of the problem. The problem itself showed up first while lmtp zlib was on.

Tim It is complaining about the **physical** size though, that is, the amount stored on disk. If you have a dovecot process which is unaware of compression, it can record the wrong size for the file.

Aki OK, I see. Another thing I noticed: The uidlist entry for a suspicious number of these problematic files contains what looks like a GUID:

G1674674677.M641373P33277.node2

If I remove the uidlist and let dovecot recreate it, it is usually gone. Might that be an indicator of some other process writing to the uidlist file? the GUID is not mentioned in the dovecot docs as far as I can see.

Tim It sure sounds like that.

Aki

OK, for future reference: I think I found the issue.

There was a periodic doveadm quotacheck job that was unaware of the zlib compression.

I fixed that and no new corruption occured (though I still see errors from already corrupted cache data - that will hopefully dry up over time).

However: I have still no idea why dovecot is complaining about the index.* files. It seems that the source of the wrong data is the dovecot-uidlist.

Also I don't see why the quotacheck cmd (doveadm quota recalc -u <>) **sometimes** updates the dovecot-uidlist file. The quota itself is stored in a sql dict.

Thanks to all who provided their input and especially Aki for the support!

Tim