dovecot - Nov 2014 - mail-storage.c:2222:mailbox_copy assertion failed: (!ctx->unfinished)

Hi,

I see a lot of crashes in my syslog lately. Specifically a sequence of
errors exactly like this (only the timestamp differs).
> Nov 10 21:29:53 khitomer dovecot: imap-login: Login: user=<user at
hostname>, method=PLAIN, rip=XXXX, lip=YYYY, mpid=ZZZZ, TLS,
session=<TTTT>
> Nov 10 21:29:53 khitomer dovecot: imap(user at hostname): Panic: file
mail-storage.c: line 2222 (mailbox_copy): assertion failed:
(!ctx->unfinished)
> Nov 10 21:29:53 khitomer dovecot: imap(user at hostname): Fatal: master:
service(imap): child 35108 killed with signal 6 (core not dumped)
I have the mail storage on ZFS, one separate filesystem per user and
another for the lucene indexes. I.e. these are separate ZFS filesystems
(not pools):
> /var/mail/vhosts/%d/%n
> /var/mail/vhosts/%d/%n/lucene-indexes
Any idea what could be going wrong?

partial config (without LDA, SSL and auth portions):
> # 2.2.15: /usr/local/etc/dovecot/dovecot.conf
> # OS: FreeBSD 10.0-RELEASE-p12 amd64
> mail_gid = mail
> mail_location = maildir:~/Maildir/
> mail_plugins = acl mailbox_alias quota virtual
> mail_privileged_group = mail
> mail_uid = vmail
> namespace {
>   list = yes
>   location = maildir:/var/mail/public:INDEXPVT=~/Maildir/public
>   prefix = Public.
>   separator = .
>   subscriptions = no
>   type = public
> }
> namespace {
>   list = children
>   location = maildir:%%h/Maildir/:INDEX=~/Maildir/shared/%%n
>   prefix = shared.%%n.
>   separator = .
>   subscriptions = no
>   type = shared
> }
> namespace {
>   location = virtual:~/Maildir/virtual
>   prefix = virtual.
>   separator = .
>   type = private
> }
> namespace inbox {
>   inbox = yes
>   location >   mailbox Drafts {
>     special_use = \Drafts
>   }
>   mailbox Junk {
>     auto = create
>     special_use = \Junk
>   }
>   mailbox Sent {
>     auto = create
>     special_use = \Sent
>   }
>   mailbox Trash {
>     auto = create
>     special_use = \Trash
>   }
>   mailbox virtual.All {
>     special_use = \All
>   }
>   prefix >   separator = .
> }
> plugin {
>   acl = vfile:/usr/local/etc/dovecot/global-acls:cache_secs=10
>   acl_anyone = allow
>   acl_shared_dict = file:/var/mail/vhosts/%d/shared-mailboxes.db
>   antispam_backend = mailtrain
>   antispam_mail_notspam = -g
>   antispam_mail_sendmail = /usr/bin/nice
>   antispam_mail_sendmail_args =
/usr/local/bin/python2;-W;ignore;/usr/local/bin/sb_filter.py;-d;%h/.hammiedb;-f
>   antispam_mail_spam = -s
>   antispam_spam = SPAM;Spam;Junk
>   antispam_trash = Trash
>   antispam_unsure = Filtered-Spam;Possible-Spam
>   fetchmail_pidfile = %h/.fetchmail.pid
>   fts = lucene
>   fts_autoindex = yes
>   fts_autoindex_max_recent_msgs = 30
>   fts_decoder = decode2text
>   fts_index_timeout = 60
>   fts_lucene = whitespace_chars=@. mime_parts
>   mailbox_alias_new = Sent Messages
>   mailbox_alias_new2 = Sent Items
>   mailbox_alias_old = Sent
>   mailbox_alias_old2 = Sent
>   quota = maildir:User quota
>   quota_grace = 10%%
>   quota_rule = *:storage=1G
>   quota_rule2 = Trash:storage=+100M
>   quota_rule3 = Junk:ignore
>   quota_rule4 = Possible-Spam:ignore
>   quota_rule5 = Filtered-Spam:ignore
>   recipient_delimiter = +
> }
> postmaster_address = postmaster@$hostname
> protocols = imap lmtp sieve
> quota_full_tempfail = yes
> service auth-worker {
>   user = $default_internal_user
> }
> service imap-login {
>   inet_listener imaps {
>     port = 993
>     ssl = yes
>   }
> }
> service imap {
>   drop_priv_before_exec = yes
> }
> userdb {
>   args = username_format=%u /usr/local/etc/dovecot/users
>   default_fields = home=/var/mail/vhosts/%d/%n
>   driver = passwd-file
> }
> protocol imap {
>   mail_max_userip_connections = 25
>   mail_plugins = acl mailbox_alias quota virtual imap_acl zlib imap_zlib
imap_quota expire fetchmail_wakeup antispam
> }
-- 
Met vriendelijke groet,
With kind regards,
Giel van Schijndel
--
"It would seem that perfection is attained not when no more can be
 added, but when no more can be removed."
  -- Antoine de Saint Exup?ry
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 181 bytes
Desc: Digital signature
URL:
<http://dovecot.org/pipermail/dovecot/attachments/20141110/bd188b24/attachment.sig>