XBACKUP and backupd not backing up public folders (3.0.8)

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Hi everyone,

I'm deploying Cyrus 3.0.8 (Debian buster 3.0.8-6) at $dayjob to replace
an Exchange server.  That part is going well, but I'm hitting a hurdle
pulling backups of public folders (shared mailboxes, calendars and
address books, anything outside the user/ hierarchy) using XBACKUP and
backupd.

Steps to reproduce:

1. On master server (mail-3175-1), run imtest and authenticate as admin.
2. Issue XBACKUP to backup normal user.  This succeeds.
3. Issue XBACKUP to backup public shared mailbox.  This produces error
BAD PROTOCOL.

Expected behaviour is that the backup server backs up this mailbox with
an OK response.

I'm seeing what looks like a segfault in the backup server logs.  Don't
know if this is significant.

Help?

Main server (mail-3175-1): Debian buster, cyrus 3.0.8-6
Backup server (rsync): Debian buster, cyrus 3.0.8-6

--- imtest session ---

mail-3175-1$ /usr/lib/cyrus/bin/imtest -a cyrus
WARNING: no hostname supplied, assuming localhost

S: * OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE STARTTLS AUTH=PLAIN
SASL-IR] mail-3175-1 Cyrus IMAP 3.0.8-Debian-3.0.8-6 server ready
Please enter your password:
C: A01 AUTHENTICATE PLAIN ***DELETED***
S: A01 OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE ACL RIGHTS=kxten
QUOTA MAILBOX-REFERRALS NAMESPACE UIDPLUS NO_ATOMIC_RENAME UNSELECT
CHILDREN MULTIAPPEND BINARY CATENATE CONDSTORE ESEARCH SEARCH=FUZZY SORT
SORT=MODSEQ SORT=DISPLAY SORT=UID THREAD=ORDEREDSUBJECT
THREAD=REFERENCES THREAD=REFS ANNOTATEMORE ANNOTATE-EXPERIMENT-1
METADATA LIST-EXTENDED LIST-STATUS LIST-MYRIGHTS LIST-METADATA WITHIN
QRESYNC SCAN XLIST XMOVE MOVE SPECIAL-USE CREATE-SPECIAL-USE DIGEST=SHA1
X-REPLICATION URLAUTH URLAUTH=BINARY LOGINDISABLED COMPRESS=DEFLATE
X-QUOTA=STORAGE X-QUOTA=MESSAGE X-QUOTA=X-ANNOTATION-STORAGE
X-QUOTA=X-NUM-FOLDERS IDLE] Success (no protection)
SESSIONID=<cyrus-***DELETED***>
Authenticated.
Security strength factor: 0
AAA XBACKUP user/debbiep@xxxxxxxxxxxxxxx rsync
* OK USER debbiep@xxxxxxxxxxxxxxx
AAA OK Completed
BBB XBACKUP support@xxxxxxxxxxxxxxx rsync
* NO MAILBOX polyfoam.com.au!support (Bad protocol)
BBB NO Bad protocol

--- log on master ---

Oct  9 13:31:37 mail-3175-1 cyrus/imap[189353]: login: localhost [::1]
cyrus PLAIN User logged in
SESSIONID=<cyrus-189353-1570588288-1-17156687401313158221>
Oct  9 13:31:55 mail-3175-1 cyrus/imap[189353]: XBACKUP: connecting to
server 'rsync.polyfoam.com.au' for channel 'rsync'
Oct  9 13:32:01 mail-3175-1 cyrus/imap[189353]: XBACKUP: replicating
user debbiep@xxxxxxxxxxxxxxx
Oct  9 13:32:15 mail-3175-1 cyrus/imap[189353]: XBACKUP: connecting to
server 'rsync.polyfoam.com.au' for channel 'rsync'
Oct  9 13:32:21 mail-3175-1 cyrus/imap[189353]: XBACKUP: replicating
mailbox polyfoam.com.au!support
Oct  9 13:32:21 mail-3175-1 cyrus/imap[189353]: IOERROR: zero length
response to MAILBOXES (end of file reached)
Oct  9 13:32:21 mail-3175-1 cyrus/imap[189353]: IOERROR: zero length
response to RESTART (end of file reached)
Oct  9 13:32:22 mail-3175-1 cyrus/imap[189353]: USAGE cyrus user:
0.059546 sys: 0.024519

--- log on backup server ---

***successful backup of user debbiep not shown***
Oct  9 13:32:15 rsync cyrus/backupd[21340]: telling master 2
Oct  9 13:32:15 rsync cyrus/backupd[21340]: accepted connection
Oct  9 13:32:15 rsync cyrus/backupd[21340]: telling master 3
Oct  9 13:32:15 rsync cyrus/master[16697]: service backupd/ipv4 pid
21340 in READY state: now unavailable and in BUSY state
Oct  9 13:32:15 rsync cyrus/master[16697]: service backupd/ipv4 now has
0 ready workers
Oct  9 13:32:15 rsync cyrus/master[16697]: service backupd/ipv4 pid
21340 in BUSY state: now serving connection
Oct  9 13:32:15 rsync cyrus/master[16697]: service backupd/ipv4 now has
0 ready workers
Oct  9 13:32:21 rsync cyrus/backupd[21340]: login:
mail-3175-1.polyfoam.com.au [10.3.244.125] rsync-mail-3175-1 DIGEST-MD5
User logged in
Oct  9 13:32:21 rsync cyrus/master[16697]: process type:SERVICE
name:backupd path:/usr/lib/cyrus/bin/backupd age:25.007s pid:21340
signaled to death by signal 11 (Segmentation fault)
Oct  9 13:32:21 rsync cyrus/master[16697]: service backupd/ipv4 pid
21340 in BUSY state: terminated abnormally
Oct  9 13:32:21 rsync cyrus/master[16697]: service backupd/ipv4 now has
0 ready workers

---master config---

admins: cyrus
allowanonymouslogin: no
allowplaintext: yes
altnamespace: yes
autocreate_inbox_folders: Junk|Trash|Archive|Drafts|Important|Sent
autocreate_post: yes
autocreate_quota: 0
autocreate_subscribe_folders: Junk|Trash|Archive|Drafts|Sent
calendarprefix: #calendars
configdirectory: /var/lib/cyrus
defaultdomain: ad.polyfoam.com.au
defaultpartition: default
hashimapspool: true
httpmodules: caldav carddav
idlesocket: /run/cyrus/socket/idle
lmtp_downcase_rcpt: yes
lmtpsocket: /run/cyrus/socket/lmtp
loginrealms:  ad.polyfoam.com.au polyfoam.com.au flexifoam.com.au
mboxname_lockpath: /run/cyrus/lock
newsspool: /var/spool/news
notifysocket: /run/cyrus/socket/notify
partition-default: /var/spool/cyrus/mail
partition-news: /var/spool/cyrus/news
popminpoll: 1
proc_path: /run/cyrus/proc
rsync_sync_authname: rsync-mail-3175-1@rsync
rsync_sync_host: rsync.polyfoam.com.au
rsync_sync_password: ***DELETED***
rsync_sync_port: csync
sasl_auto_transition: no
sasl_auxprop_plugin: sasldb
sasl_mech_list: PLAIN
sasl_pwcheck_method: auxprop saslauthd
sievedir: /var/spool/sieve
sieveusehomedir: false
syslog_prefix: cyrus
tls_client_ca_dir: /etc/ssl/certs
tls_server_cert: /etc/cert/mail-3175-1.polyfoam.com.au.crt
tls_server_key: /etc/cert/mail-3175-1.polyfoam.com.au.key
tls_session_timeout: 1440
umask: 077
unixhierarchysep: yes
virtdomains: on
xbackup_enabled: yes
xlist-Archive: Archive
xlist-Drafts: Drafts
xlist-Important: Important
xlist-Junk: Junk
xlist-Sent: Drafts
xlist-Trash: Trash

---backup config---

admins: rsync-mail-3175-1
allowanonymouslogin: no
altnamespace: yes
backup_compact_maxsize: 0
backup_compact_minsize: 0
backup_compact_work_threshold: 1
backup_db: twoskip
backuppartition-name: /home/mail-3175-1/cyrus-backup/partitions/default
backup_retention_days: 7
configdirectory: /var/lib/cyrus
debug: 1
defaultdomain: rsync
mboxname_lockpath: /run/cyrus/lock
proc_path: /run/cyrus/proc
sasl_auxprop_plugin: sasldb
sasl_mech_list: DIGEST-MD5
sasl_pwcheck_method: auxprop
syslog_prefix: cyrus
unixhierarchysep: yes
virtdomains: on

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