doveadm backup only working once?

Engelbert Torremans engelbert at torremans.com
Mon Jan 4 19:25:38 EET 2021 

All,

For the past 2 weeks I have been trying to get dovecot mail backup 
working between 2 debian 10 machines.

Both machines are running the same OS (Debian 10) and configuration wise 
they are similar (except of course ip addresses, hostnames etc).

My "main" machine is called "server" and the 2nd machine is "server2".

See below for the dovecot -n output on server2.

I created a testuser called synctest on both server1 and server2 and 
have sent a couple (2) email messages to synctest at server.

Those testmessages are now present in /var/mail/synctest mbox file on 
server1.

When trying to create a backup from server->server2 for user synctest I 
use this command:

#doveadm -D -v backup -R -f -u synctest tcp:192.168.3.1:12345
(using something similar from server1 -> server2 like this: #doveadm -D 
-v backup -f -u synctest tcp:192.168.3.2:12345 has the same results btw)

The first attempte appears to be working OK but the the 2nd attempt 
(nothing was changed on server1 before the 2nd attempt) fails with 
soemthing like: Error: Couldn't delete mailbox INBOX: Permission denied

Before I can get a succesfull backup again I need to do this (on server2):

#rm /var/mail/synctest
#rm -r ~syncuser/mail/index/INBOX
#doveadm mailbox delete -u synctest INBOX
(if I don't do the rm /var/mail/synctest before the doveadm mailbox 
delete command I will also get a:
Error: Can't delete mailbox INBOX: Permission denied

Anybody any idea what is happening here? Should I enable replicator 
and/or aggregator?

Output of 1st and 2nd dovadm backup attempt is below:

root at server2:/home/synctest/mail# doveadm -D -v backup -R -f -u synctest 
tcp:192.168.3.1:12345
Debug: Loading modules from directory: /usr/lib/dovecot/modules/doveadm
Debug: Skipping module doveadm_acl_plugin, because dlopen() failed: 
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_acl_plugin.so: undefined 
symbol: acl_user_module (this is usually intentional, so just ignore 
this message)
Debug: Skipping module doveadm_expire_plugin, because dlopen() failed: 
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_expire_plugin.so: 
undefined symbol: expire_set_deinit (this is usually intentional, so 
just ignore this message)
Debug: Skipping module doveadm_quota_plugin, because dlopen() failed: 
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_quota_plugin.so: 
undefined symbol: quota_user_module (this is usually intentional, so 
just ignore this message)
Debug: Module loaded: 
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_sieve_plugin.so
Debug: Skipping module doveadm_fts_lucene_plugin, because dlopen() 
failed: 
/usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_lucene_plugin.so: 
undefined symbol: lucene_index_iter_deinit (this is usually intentional, 
so just ignore this message)
Debug: Skipping module doveadm_fts_plugin, because dlopen() failed: 
/usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_plugin.so: undefined 
symbol: fts_user_get_language_list (this is usually intentional, so just 
ignore this message)
Debug: Skipping module doveadm_mail_crypt_plugin, because dlopen() 
failed: 
/usr/lib/dovecot/modules/doveadm/libdoveadm_mail_crypt_plugin.so: 
undefined symbol: mail_crypt_box_get_pvt_digests (this is usually 
intentional, so just ignore this message)
doveadm(synctest)<13039><>: Debug: auth USER input: synctest 
system_groups_user=synctest uid=1006 gid=100 home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): auth USER input: 
synctest system_groups_user=synctest uid=1006 gid=100 home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): Effective uid=1006, 
gid=100, home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): Namespace inbox: 
type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes, 
subscriptions=yes 
location=mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: remote(192.168.3.1:12345): fs: 
root=/home/synctest/mail/mailboxes, index=/home/synctest/mail/index, 
indexpvt=, control=/home/synctest/mail/control, 
inbox=/var/mail/synctest, alt=
doveadm(synctest): Debug: Effective uid=1006, gid=100, home=/home/synctest
doveadm(synctest): Debug: Namespace inbox: type=private, prefix=, sep=, 
inbox=yes, hidden=no, list=yes, subscriptions=yes 
location=mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: fs: root=/home/synctest/mail/mailboxes, 
index=/home/synctest/mail/index, indexpvt=, 
control=/home/synctest/mail/control, inbox=/var/mail/synctest, alt=
doveadm(synctest): Debug: brain M: Namespace  has location 
mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: Namespace : Using permissions from 
/home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Remote 
mailbox tree: INBOX guid=f8ecea204a65f05fea460000b4581695 
uid_validity=1609590090 uid_next=9 subs=no last_change=0 last_subs=0
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Mailbox 
INBOX: local=00000000000000000000000000000000/0/0, 
remote=f8ecea204a65f05fea460000b4581695/0/1: mailbox not selectable yet
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: Namespace : 
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default 
permissions
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: Namespace : Using 
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: Namespace : 
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default 
permissions
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: Namespace : Using 
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: Namespace : 
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default 
permissions
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: Namespace : Using 
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: Namespace : 
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default 
permissions
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: Namespace : Using 
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=1 hdr_hash= 
result=Expunged mail not found locally
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=2 hdr_hash= 
result=Expunged mail not found locally
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=3 hdr_hash= 
result=Expunged mail not found locally
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=4 hdr_hash= 
result=Expunged mail not found locally
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=5 hdr_hash= 
result=Expunged mail not found locally
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=6 hdr_hash= 
result=Expunged mail not found locally
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Last common UID=0. Delayed expunges=
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=save GUID=8bce3bc615e7f2a1dfad970a3cd36bdb 
UID=7 hdr_hash= result=Mail's UID is above local UIDNEXT - No more local 
mails found
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=save GUID=c9cdf5f725d4195db78b20bbacad189b 
UID=8 hdr_hash= result=New mail
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: import 
mail uid 0 guid 8bce3bc615e7f2a1dfad970a3cd36bdb
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import mail body for GUID=8bce3bc615e7f2a1dfad970a3cd36bdb UID=0
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: 
/home/synctest/mail/index/INBOX/dovecot.index.cache: Compressed, 
file_seq changed 0 -> 1609779677, size=32, max_uid=0
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: import 
mail uid 0 guid c9cdf5f725d4195db78b20bbacad189b
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Import mail body for GUID=c9cdf5f725d4195db78b20bbacad189b UID=0
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Saved UIDs: 7:8
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Finish update: min_next_uid=9 min_first_recent_uid=1 
min_highest_modseq=10 min_highest_pvt_modseq=0
dsync-local(synctest)<D+AKA91J81/vMgAAaso27A>: Debug: brain M: Import 
INBOX: Reassign UIDs: 1:

This appears to work perfectly well the first time (maybe I am 
overlooking some issue already at this stage?) At least after the backup 
has been completed /var/mail/syncuser on server2 contains all the 
messages that are also present on server1. And the 
~syncuser/mail/index/INBOX folder also exists (don't know why this is 
created btw?)

But then when running the same command for the 2nd time (and no changes 
on the /var/mail/synctest file on server1) the command failes like this 
(permission denied to delete INBOX at the end):

root at server2:/home/synctest/mail# doveadm -D -v backup -R -f -u synctest 
tcp:192.168.3.1:12345
Debug: Loading modules from directory: /usr/lib/dovecot/modules/doveadm
Debug: Skipping module doveadm_acl_plugin, because dlopen() failed: 
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_acl_plugin.so: undefined 
symbol: acl_user_module (this is usually intentional, so just ignore 
this message)
Debug: Skipping module doveadm_expire_plugin, because dlopen() failed: 
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_expire_plugin.so: 
undefined symbol: expire_set_deinit (this is usually intentional, so 
just ignore this message)
Debug: Skipping module doveadm_quota_plugin, because dlopen() failed: 
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_quota_plugin.so: 
undefined symbol: quota_user_module (this is usually intentional, so 
just ignore this message)
Debug: Module loaded: 
/usr/lib/dovecot/modules/doveadm/lib10_doveadm_sieve_plugin.so
Debug: Skipping module doveadm_fts_lucene_plugin, because dlopen() 
failed: 
/usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_lucene_plugin.so: 
undefined symbol: lucene_index_iter_deinit (this is usually intentional, 
so just ignore this message)
Debug: Skipping module doveadm_fts_plugin, because dlopen() failed: 
/usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_plugin.so: undefined 
symbol: fts_user_get_language_list (this is usually intentional, so just 
ignore this message)
Debug: Skipping module doveadm_mail_crypt_plugin, because dlopen() 
failed: 
/usr/lib/dovecot/modules/doveadm/libdoveadm_mail_crypt_plugin.so: 
undefined symbol: mail_crypt_box_get_pvt_digests (this is usually 
intentional, so just ignore this message)
doveadm(synctest)<13056><>: Debug: auth USER input: synctest 
system_groups_user=synctest uid=1006 gid=100 home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): auth USER input: 
synctest system_groups_user=synctest uid=1006 gid=100 home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): Effective uid=1006, 
gid=100, home=/home/synctest
doveadm(synctest): Debug: remote(192.168.3.1:12345): Namespace inbox: 
type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes, 
subscriptions=yes 
location=mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: remote(192.168.3.1:12345): fs: 
root=/home/synctest/mail/mailboxes, index=/home/synctest/mail/index, 
indexpvt=, control=/home/synctest/mail/control, 
inbox=/var/mail/synctest, alt=
doveadm(synctest): Debug: Effective uid=1006, gid=100, home=/home/synctest
doveadm(synctest): Debug: Namespace inbox: type=private, prefix=, sep=, 
inbox=yes, hidden=no, list=yes, subscriptions=yes 
location=mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: fs: root=/home/synctest/mail/mailboxes, 
index=/home/synctest/mail/index, indexpvt=, 
control=/home/synctest/mail/control, inbox=/var/mail/synctest, alt=
doveadm(synctest): Debug: brain M: Namespace  has location 
mbox:~/mail/mailboxes:INBOX=/var/mail/synctest:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
doveadm(synctest): Debug: Namespace : 
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default 
permissions
doveadm(synctest): Debug: Namespace : Using permissions from 
/home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Local 
mailbox tree: INBOX guid=f8ecea204a65f05fea460000b4581695 
uid_validity=1609590090 uid_next=9 subs=no last_change=0 last_subs=0
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Remote 
mailbox tree: INBOX guid=f8ecea204a65f05fea460000b4581695 
uid_validity=1609590090 uid_next=9 subs=no last_change=0 last_subs=0
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Mailbox 
INBOX: local=f8ecea204a65f05fea460000b4581695/0/1, 
remote=f8ecea204a65f05fea460000b4581695/0/1: Mailboxes are equal
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: Namespace : 
/home/synctest/mail/mailboxes/INBOX doesn't exist yet, using default 
permissions
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: Namespace : Using 
permissions from /home/synctest/mail/mailboxes: mode=0700 gid=default
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=1 hdr_hash= 
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=2 hdr_hash= 
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=3 hdr_hash= 
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=4 hdr_hash= 
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=5 hdr_hash= 
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=expunge GUID=<unknown> UID=6 hdr_hash= 
result=Expunged mail has no GUID, can't verify it
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Warning: Deleting mailbox 
'INBOX': UID=7 already exists locally for a different mail: Headers 
hashes don't match (9fc2f2229a1a2a8d5f12304cb5287f97 vs 
b62e0281b4f375a45040c552b55ab31a)
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import 
INBOX: Import change type=save GUID=8bce3bc615e7f2a1dfad970a3cd36bdb 
UID=7 hdr_hash=9fc2f2229a1a2a8d5f12304cb5287f97 result=Headers hashes 
don't match (9fc2f2229a1a2a8d5f12304cb5287f97 vs 
b62e0281b4f375a45040c552b55ab31a)
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: brain M: Import 
INBOX: Saved UIDs:
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: doveadm-sieve: 
Iterating Sieve mailbox attributes
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: Pigeonhole 
version 0.5.4 () initializing
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: include: 
sieve_global is not set; it is currently not possible to include 
`:global' scripts.
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file 
storage: Using active Sieve script path: /home/synctest/.dovecot.sieve
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file 
storage: Using script storage path: /home/synctest/sieve
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file 
storage: Using permissions from /home/synctest/sieve: mode=0700 gid=-1
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file 
storage: Relative path to sieve storage in active link: sieve/
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Debug: sieve: file 
storage: sync: Synchronization active
dsync-local(synctest)<VqbhHQhL818AMwAAaso27A>: Error: Couldn't delete 
mailbox INBOX: Permission denied

root at server2:/home/synctest/mail# dovecot -n
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.4 ()
# OS: Linux 4.19.0-12-amd64 x86_64 Debian 10.6
# Hostname: server2.fritz.box
auth_username_format = %Ln
doveadm_password = # hidden, use -P to show it
lda_mailbox_autocreate = yes
login_trusted_networks = 192.168.3.0/24
mail_location = 
mbox:~/mail/mailboxes:INBOX=/var/mail/%u:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control
mail_privileged_group = mail
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
namespace inbox {
   inbox = yes
   location =
   mailbox Drafts {
     special_use = \Drafts
   }
   mailbox Junk {
     special_use = \Junk
   }
   mailbox Sent {
     special_use = \Sent
   }
   mailbox "Sent Messages" {
     special_use = \Sent
   }
   mailbox Trash {
     special_use = \Trash
   }
   prefix =
}
passdb {
   driver = pam
}
plugin {
   sieve = ~/.dovecot.sieve
   sieve_default = /var/lib/dovecot/sieve/default.sieve
   sieve_dir = ~/sieve
}
postmaster_address = postmaster@"domain"
protocols = imap pop3 lmtp
service doveadm {
   inet_listener {
     port = 12345
   }
}
service managesieve-login {
   inet_listener sieve {
     port = 4190
   }
}
ssl_cert = </etc/letsencrypt/live/"domain"/fullchain.pem
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
userdb {
   driver = passwd
}
protocol lmtp {
   mail_plugins = " sieve"
}
protocol lda {
   mail_plugins = " sieve"
}

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