Error: Corrupted index cache file

[Sohin Vyacheslav]

Hi All,

In mail.log exists an error messages "Error: Corrupted index cache file 
/data/mail/vhosts/domain.com/user at domain.com/Maildir/dovecot.index.cache: 
invalid record size" for some accounts.

I tried these steps to fix it:

1. Running commands
# doveadm -D -v index -u user at domain.com INBOX
# doveadm -v force-resync -u user at domain.com INBOX

after this I saw that the following files are updated in ../Maildir/:
dovecot.index.cache
dovecot.index.log
dovecot-uidlist

But after some time error messages occurred again.

2. Added NFS mount option 'nordirplus' to /etc/fstab with remount /data 
partition, add 'mmap_disable = yes' and 'mail_fsync = always' to 
10-mail.conf as advised on 
https://doc.dovecot.org/configuration_manual/nfs/ (because /data 
partition mounted via NFS);

3. Renaming 3 files with/without Dovecot service pre-stop.

# mv dovecot.index old.dovecot.index
# mv dovecot.index.cache old.dovecot.index.cache
# mv dovecot.index.log old.dovecot.index.log

Unfortunately, all done steps didn't fix issue.
What is the proper way to fix corrupted index cache errors?


dovecot package: 1:2.2.33.2-1ubuntu4.8 (Ubuntu-18.04).


p.s. for some of email accounts also exists error messages "Error: 
Broken file ../Maildir/dovecot-uidlist line ###: Invalid data:" besides 
mentioned cache error.


-- 
Best wishes
Sohin Vyacheslav