dsync: assert panic on mbox // no INBOX sync on hybrid mbox/maildir
Aki Tuomi
aki.tuomi at dovecot.fi
Wed Sep 27 13:48:56 EEST 2017
Hi, this particular crash is being tracked internally. We have not been
able to fix it yet.
Aki
On 27.09.2017 13:47, David Gardner wrote:
> Hi,
> replying to my own issue:
> The dsync crash seems to be triggered when there are emails to copy in
> both directions, and it's fairly clear from comments in the code that
> it should be releasing a read lock before trying to grab a write lock.
>
> A work-around for the crash was doing a one-way sync manually. This
> allowed the process to complete and my setup is now replicating
> properly. I guess as long as I don't trigger changes on both hosts
>
> David
>
>
> On 26 September 2017 at 22:39, David Gardner <somloieater at gmail.com> wrote:
>> Hi,
>> This (hopefully!) might be a case of user error, as I'm new to
>> dovecot... Alternatively it might be some confusion in an index, since
>> I've been mucking about trying different things in my configuration
>> files and had frequent crashes.
>>
>> I'm trying to sync 2 (LAN) hosts, ideally to have full automatic
>> replication happening.
>>
>> They both have hybrid mbox INBOX and maildir++ folders, using
>> namespaces, as suggested in the wiki. I might have deviated the config
>> from the wiki version, in trying to get things working.
>>
>> Both hosts communicate perfectly with an external IMAP client (thunderbird).
>> Replication is working, but only partially - it is syncing the folders
>> but not INBOX. I've thus been trying various things to try to get the
>> INBOX to sync.
>>
>> The crash is only happening one of the 2 hosts which I've named
>> crashhost for this report. The process crashes no matter which host
>> starts the sync.
>> With a second user, the crash happens on the other host
>>
>> crashhost: Ubuntu 16.04, x86_64, laptop, Dovecot 2.2.22, and Dovecot
>> 2.2.32 (from debian sid package, locally compiled)
>> otherhost: Ubuntu 16.04, x86_64, desktop, Dovecot 2.2.22, and Dovecot
>> 2.2.32 (from debian sid package, locally compiled)
>>
>>
>> RESULTS:
>>
>> 1) doveadm sync -f -u david tcp:otherhost
>> synchronises the folders, but does not touch INBOXes.
>>
>> 2) doveadm sync -f -m INBOX -u david tcp:otherhost
>> Does not touch INBOXes
>>
>> 3) doveadm sync -n '#mbox/' -f -u david tcp:otherhost
>> dsync-local(david): Panic: file mbox-lock.c: line 800 (mbox_lock):
>> assertion failed: (lock_type == F_RDLCK || mbox->mbox_lock_type !=
>> F_RDLCK)
>>
>> I added some debug code, the assertion failure is being triggered by a
>> call to mbox-lock() with:
>> locktype=F_WRCLK mbox->mbox_lock_type=F_RDLCK, mbox->external_transactions=1
>>
>> The config files on the 2 hosts only differ by the hostnames they're
>> supposed to be syncing to.
>>
>> $ dovecot -n
>> # 2.2.32 (dfbe293d4): /etc/dovecot/dovecot.conf
>> # Pigeonhole version 0.4.20 (7cd71ba)
>> # OS: Linux 4.10.0-35-generic x86_64 Ubuntu 16.04.3 LTS
>> doveadm_password = # hidden, use -P to show it
>> doveadm_port = 12346
>> imapc_host = crashhost
>> imapc_password = # hidden, use -P to show it
>> imapc_port = 993
>> imapc_ssl = imaps
>> imapc_ssl_verify = no
>> imapc_user = %u
>> mail_location = maildir:~/mail
>> mail_plugins = " notify replication"
>> mail_privileged_group = mail
>> namespace {
>> inbox = no
>> list = yes
>> location =
>> prefix =
>> separator = /
>> subscriptions = yes
>> }
>> namespace inbox {
>> hidden = yes
>> inbox = yes
>> list = no
>> location = mbox:~/nomail:INBOX=/var/mail/%u:INDEX=/var/spool/mailindex/%u
>> 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 = "#mbox/"
>> separator = /
>> type = private
>> }
>> passdb {
>> args = scheme=CRYPT username_format=%u /etc/dovecot/users
>> driver = passwd-file
>> }
>> plugin {
>> mail_replica = tcp:otherhost:12346
>> }
>> protocols = " imap"
>> service aggregator {
>> fifo_listener replication-notify-fifo {
>> mode = 0666
>> user = vmail
>> }
>> unix_listener replication-notify {
>> mode = 0666
>> user = vmail
>> }
>> }
>> service config {
>> unix_listener config {
>> user = vmail
>> }
>> }
>> service doveadm {
>> inet_listener {
>> port = 12346
>> }
>> user = root
>> }
>> service replicator {
>> process_min_avail = 1
>> unix_listener replicator-doveadm {
>> mode = 0666
>> }
>> }
>> ssl = required
>> ssl_cert = </etc/dovecot/dovecot.pem
>> ssl_client_ca_dir = /etc/ssl
>> ssl_key = # hidden, use -P to show it
>> userdb {
>> args = username_format=%u /etc/dovecot/users
>> driver = passwd-file
>> }
>>
>> gdb) bt
>> #0 0x00007f37f426e428 in __GI_raise (sig=sig at entry=6) at
>> ../sysdeps/unix/sysv/linux/raise.c:54
>> #1 0x00007f37f427002a in __GI_abort () at abort.c:89
>> #2 0x00007f37f469f7aa in ?? () from /usr/lib/dovecot/libdovecot.so.0
>> #3 0x00007f37f469f829 in default_fatal_handler () from
>> /usr/lib/dovecot/libdovecot.so.0
>> #4 0x00007f37f46302a1 in i_panic () from /usr/lib/dovecot/libdovecot.so.0
>> #5 0x00007f37f49ac235 in mbox_lock () from
>> /usr/lib/dovecot/libdovecot-storage.so.0
>> #6 0x00007f37f49adb11 in mbox_save_begin () from
>> /usr/lib/dovecot/libdovecot-storage.so.0
>> #7 0x00007f37f49769a1 in mailbox_save_begin () from
>> /usr/lib/dovecot/libdovecot-storage.so.0
>> #8 0x00007f37f496a2e8 in mail_storage_copy () from
>> /usr/lib/dovecot/libdovecot-storage.so.0
>> #9 0x00007f37f3e332a5 in ?? () from
>> /usr/lib/dovecot/modules/lib15_notify_plugin.so
>> #10 0x00007f37f4976b73 in ?? () from /usr/lib/dovecot/libdovecot-storage.so.0
>> #11 0x00007f37f4976d89 in mailbox_move () from
>> /usr/lib/dovecot/libdovecot-storage.so.0
>> #12 0x000055b45f0da448 in ?? ()
>> #13 0x000055b45f0db35a in ?? ()
>> #14 0x000055b45f0ddbc0 in dsync_mailbox_import_changes_finish ()
>> #15 0x000055b45f0d8645 in dsync_brain_sync_mails ()
>> #16 0x000055b45f0d3df8 in dsync_brain_run ()
>> #17 0x000055b45f0d4140 in ?? ()
>> #18 0x000055b45f0ea3ff in ?? ()
>> #19 0x00007f37f46b4c82 in io_loop_call_io () from
>> /usr/lib/dovecot/libdovecot.so.0
>> #20 0x00007f37f46b6309 in io_loop_handler_run_internal () from
>> /usr/lib/dovecot/libdovecot.so.0
>> #21 0x00007f37f46b4d1c in io_loop_handler_run () from
>> /usr/lib/dovecot/libdovecot.so.0
>> #22 0x00007f37f46b4ec8 in io_loop_run () from /usr/lib/dovecot/libdovecot.so.0
>> #23 0x000055b45f0bb4c2 in ?? ()
>> #24 0x000055b45f0bd91c in ?? ()
>> #25 0x000055b45f0be5aa in ?? ()
>> #26 0x000055b45f0beeda in doveadm_mail_try_run ()
>> #27 0x000055b45f0ae47c in main ()
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