Error: Filename keeps changing

24 May 2016


      Dear all,
Two days ago, my ldap server (for authentication) crashed and I had to
set up a new one. Everything works fine except the mailbox for one user
(let's name him debugger). When I try to access his mail whatever way,
dovecot complains about "Error: maildir_file_do(........): Filename
keeps changing"
For example, a command "doveadm copy -u debugger@boontje.net Archive
mailbox Netspar" returns
doveadm(debugger@boontje.net): Error:
maildir_file_do(/var/mail/vmail/boontje.net/debugger/mail/Netspar/cur/1423052681.M610997P2829.mail,S=1499407,W=1518981:2,S):
Filename keeps changing
doveadm(debugger@boontje.net): Error: Copying message UID 1 from
'Netspar' failed: Internal error occurred. Refer to server log for more
information. [2016-05-24 13:19:58]
doveadm(debugger@boontje.net): Error:
maildir_file_do(/var/mail/vmail/boontje.net/debugger/mail/Netspar/cur/1447239217.M843201P13440.mail,S=6052999,W=6131730:2,RSa):
Filename keeps changing
doveadm(debugger@boontje.net): Error: Copying message UID 2 from
'Netspar' failed: Internal error occurred. Refer to server log for more
information. [2016-05-24 13:19:58]
doveadm(debugger@boontje.net): Error:
maildir_file_do(/var/mail/vmail/boontje.net/debugger/mail/Netspar/cur/1447239226.M993616P13440.mail,S=13920,W=14288:2,S):
Filename keeps changing
doveadm(debugger@boontje.net): Error: Copying message UID 3 from
'Netspar' failed: Internal error occurred. Refer to server log for more
information. [2016-05-24 13:19:58]
doveadm(debugger@boontje.net): Error:
maildir_file_do(/var/mail/vmail/boontje.net/debugger/mail/Netspar/cur/1449826302.M51386P11767.mail,S=1252017,W=1268393:2,RS):
Filename keeps changing
doveadm(debugger@boontje.net): Error: Copying message UID 4 from
'Netspar' failed: Internal error occurred. Refer to server log for more
information. [2016-05-24 13:19:58]
It does this on ALL mailboxes of this user and only this user. Other
users give no problems. Accessing the mails via a mail client
(Roundcube, Thunderbird, etc...) give the same error.
Dovecot runs on a virtual machine and the mailboxes are stored via a
CIFS-share on a NAS. I rebooted both machines, checked the filesystem
(no errors), CIFS-share, directories and mail files are readable and
writeable by dovecot user (vmail on the mail server). The mails are
intact, cat <filename> shows the full mail.
I'm baffled, any suggestions?
Kind regards,
Ward Romp
The configuration etc....
# 2.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 4.2.0-36-generic x86_64 Ubuntu 14.04.4 LTS cifs
auth_mechanisms = plain login
auth_verbose = yes
listen = *
mail_home = /var/mail/vmail/%d/%n
mail_location = maildir:/var/mail/vmail/%d/%n/mail:LAYOUT=fs
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 ihave
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 Trash {
auto = subscribe
special_use = \Trash
}
prefix =
}
passdb {
args = /etc/dovecot/conf.d/ldap.conf.ext
driver = ldap
}
plugin {
sieve = ~/.dovecot.sieve
sieve_after = /var/mail/vmail/sieve-after
sieve_before = /var/mail/vmail/sieve-before
sieve_dir = ~/sieve
}
protocols = imap sieve
service auth {
unix_listener /var/spool/postfix/private/dovecot-auth {
group = postfix
mode = 0660
user = postfix
}
}
ssl_cert =  was automatically rejected:%n%r