Hi,

probably since the update to 2.3.1 I can't backup a specific users mailbox.

For backup I use the command 'dsync -o plugin/quota= -f -u user@domain backup dbox:/backup/dir' When I execute this command with the -D option, I get to see

(above only Debug messages) dsync(user@domain): Panic: file mailbox-attribute.c: line 362 (mailbox_attribute_get_stream): assertion failed: (value_r->value != NULL || value_r->value_stream != NULL) dsync(user@domain): Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0xcc724) [0x7f0f15364724] -> /usr/lib64/dovecot/libdovecot.so.0(default_fatal_handler+0x2a) [0x7f0f1536476a] -> /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7f0f152d524b] -> /usr/lib64/dovecot/libdovecot-storage.so.0(+0x566ac) [0x7f0f156686ac] -> doveadm(dsync_mailbox_import_attribute+0x4d) [0x5581a663bf4d] -> doveadm(dsync_brain_sync_mails+0x2ef) [0x5581a66377ff] -> doveadm(dsync_brain_run+0x2b0) [0x5581a6632e90] -> doveadm(+0x2960c) [0x5581a661a60c] -> doveadm(+0x2b4f7) [0x5581a661c4f7] -> doveadm(+0x2c0dc) [0x5581a661d0dc] -> doveadm(doveadm_mail_try_run+0x205) [0x5581a661da75] -> doveadm(main+0x475) [0x5581a660cce5] -> /lib64/libc.so.6(__libc_start_main+0xf5) [0x7f0f14ca3c05] -> doveadm(+0x1be65) [0x5581a660ce65] cancelled

my dovecot -n output: # 2.3.1 (0580a21bf): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.1 (d9bc6dfe) # OS: Linux 3.10.0-693.21.1.el7.x86_64 x86_64 CentOS Linux release 7.4.1708 (Core)  xfs doveconf: Warning: please set ssl_dh= /etc/dovecot/dh.pem auth_cache_negative_ttl = 0 auth_cache_size = 100 M auth_master_user_separator = * auth_mechanisms = login plain auth_verbose = yes auth_verbose_passwords = sha1:16 deliver_log_format = msgid=%m from=%f subject=%s psize=%p status=%$ first_valid_gid = 5000 first_valid_uid = 5000 hostname = imap_capability = +XLIST imap_client_workarounds = tb-extra-mailbox-sep tb-lsub-flags last_valid_gid = 5000 last_valid_uid = 5000 lmtp_rcpt_check_quota = yes lmtp_save_to_detail_mailbox = yes mail_attachment_dir = /storage/mail/attachments mail_attachment_hash = %{sha512} mail_gid = 5000 mail_home = /storage/mail/settings/%Ld/%Ln mail_location = sdbox:/storage/mail/mails/%Ld/%Ln mail_plugins = zlib quota acl listescape fts fts_lucene mail_server_admin = mailto:postmaster@domain mail_uid = 5000 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 imapsieve vnd.dovecot.imapsieve namespace { list = children location = sdbox:/storage/mail/mails/%%d/%%n prefix = shared/%%u/ separator = / subscriptions = no type = shared } namespace inbox { inbox = yes location = mailbox Archive { special_use = \Archive } mailbox Archives { special_use = \Archive } mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox "Gesendete Objekte" { special_use = \Sent } mailbox Junk { special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = separator = / subscriptions = yes type = private } passdb { args = /etc/dovecot/passwd.masterusers driver = passwd-file master = yes pass = yes } passdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } plugin { acl = vfile:/storage/mail/settings/global-acls:cache_secs=300 acl_shared_dict = file:/storage/mail/settings/shared-mailboxes fts = lucene fts_autoindex = yes fts_lucene = whitespace_chars=@. imapsieve_mailbox1_before = file:/usr/lib64/dovecot/sieve/report-spam.sieve imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_name = Spam imapsieve_mailbox2_before = file:/usr/lib64/dovecot/sieve/report-ham.sieve imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_from = Spam imapsieve_mailbox2_name = * mail_log_fields = uid box msgid size subject quota = dict:User quota::file:%h/dovecot-quota quota_grace = 5%% quota_rule = Trash:storage=+5%% quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u sieve = file:%h/sieve;active=%h/.dovecot.sieve sieve_execute_bin_dir = /usr/lib64/dovecot/sieve sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.execute sieve_pipe_bin_dir = /usr/lib64/dovecot/sieve sieve_plugins = sieve_imapsieve sieve_extprograms zlib_save = gz zlib_save_level = 6 } postmaster_address = postmaster@domain protocols = imap lmtp sieve service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0600 user = postfix } unix_listener auth-userdb { group = dovemail mode = 0600 user = dovemail } } service lmtp { inet_listener lmtp { address = 127.0.0.1 port = 24 } unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service managesieve-login { inet_listener sieve { port = 4190 } } service quota-warning { executable = script /usr/local/bin/quota-warning.sh unix_listener quota-warning { user = dovemail } user = dovecot } ssl = required ssl_cert =

I tried to rebuild the settings files of this mailbox by deleting them and restart the service but this didnt help. A reboot did neither.

I dont know where to start fixing this problem, does anyone has an advice?

Thanks in advance