2.2.21: panic in stats-plugin.c: line 324 (stats_user_deinit): assertion failed: (stats_global_user == user)

13 Dec 2015


      Hi,
I've just upgraded dovecot to 2.2.21 (from 2.2.18), and I'm getting a
crash when doing dsync backup:
$ dsync -v -u user@domain.com backup
maildir:/backup/maildirs/domain.com/user/Maildir
dsync(user@domain.com): Panic: file stats-plugin.c: line 324
(stats_user_deinit): assertion failed: (stats_global_user == user)
dsync(user@domain.com): Error: Raw backtrace:
/usr/lib64/dovecot/libdovecot.so.0(+0x7e4b4) [0x7f543d3c74b4] ->
/usr/lib64/dovecot/libdovecot.so.0(+0x7e529) [0x7f543d3c7529] ->
/usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7f543d372300] ->
/usr/lib64/dovecot/lib90_stats_plugin.so(+0x4116) [0x7f543c95a116] ->
/usr/lib64/dovecot/libdovecot-storage.so.0(mail_user_unref+0x35)
[0x7f543d68efd5] -> /usr/bin/dsync shasta@toxcorp.com done [0x420f90]
-> /usr/bin/dsync user@domain.com done
[0x421edc] -> /usr/bin/dsync user@domain.com done [0x413a2f]
-> /lib64/libc.so.6(__libc_start_main+0xf0) [0x7f543cd80870] ->
/usr/bin/dsync user@domain.com done [0x413bb9]
Aborted
This gets logged to syslog when it happens:
Dec 13 02:12:33 host dovecot: imap-login: Login: user=user@domain.com,
method=PLAIN, rip=A.B.C.D, lip=A.B.C.D, mpid=1576, TLS
Dec 13 02:13:09 host dovecot: stats: Error: Mail server input error:
CONNECT: Duplicate session ID 4rqRBSXGbFbDBgAAOpfmEQ for user
user@domain.com service doveadm
It definitely wasn't happening on 2.2.18 (I skipped .19 and .20).
Here's my configuration (with some things sanitized):
$ dovecot -n
# 2.2.21 (5345f22): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.9 (357ac0a0e68b+)
# OS: Linux 4.3.2 x86_64 Slackware 14.2
auth_cache_negative_ttl = 1 mins
auth_cache_size = 4 k
auth_mechanisms = plain login
auth_socket_path = /var/run/dovecot/auth-userdb
auth_verbose = yes
auth_verbose_passwords = sha1
default_vsz_limit = 512 M
deliver_log_format = msgid=%m psize=%p vsize=%w: %$
first_valid_gid = 500
first_valid_uid = 500
hostname = host.domain.com
last_valid_gid = 500
last_valid_uid = 500
listen = *
login_greeting = IMAP server ready.
login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c
mail_location = mdbox:~/mdbox:ALT=/var/vmail/altmdbox/%Ld/%Ln/altmdbox
mail_plugins = " stats"
mailbox_list_index = yes
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
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 Spam {
special_use = \Junk
}
mailbox Trash {
special_use = \Trash
}
prefix =
separator = /
type = private
}
passdb {
args = scheme=CRYPT username_format=%Lu /etc/dovecot/users
driver = passwd-file
}
plugin {
mail_log_events = delete undelete expunge copy mailbox_delete
mailbox_rename
mail_log_fields = uid box msgid size
recipient_delimiter = +
sieve = ~/.dovecot.sieve
sieve_default = /var/vmail/_sieve/default.sieve
sieve_dir = ~/sieve
stats_refresh = 30 secs
stats_track_cmds = yes
}
pop3_client_workarounds = outlook-no-nuls
postmaster_address = postmaster@domain.com
protocols = imap pop3 lmtp sieve
quota_full_tempfail = yes
service auth-worker {
user = $default_internal_user
}
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0660
user = postfix
}
}
service dict {
unix_listener dict {
group = vmail
mode = 0660
user = vmail
}
}
service imap-login {
inet_listener imap {
port = 143
}
inet_listener imaps {
port = 993
ssl = yes
}
service_count = 1
}
service imap {
process_limit = 128
}
service lmtp {
inet_listener lmtp {
address = 127.0.0.1
port = 2424
}
unix_listener /var/spool/postfix/private/dovecot-lmtp {
group = postfix
mode = 0660
user = postfix
}
unix_listener lmtp-vmail {
group = vmail
mode = 0660
user = vmail
}
}
service managesieve-login {
inet_listener sieve {
port = 4190
}
service_count = 1
vsz_limit = 64 M
}
service managesieve {
process_limit = 32
}
service pop3-login {
inet_listener pop3 {
port = 110
}
inet_listener pop3s {
port = 995
ssl = yes
}
}
service pop3 {
process_limit = 64
}
service stats {
fifo_listener stats-mail {
mode = 0600
user = vmail
}
}
ssl_cert = 
Let me know if there's anything else that I can provide to help narrowing
it down.
Cheers,
shasta
--
Jakub Jankowski|shasta@toxcorp.com|http://toxcorp.com/
GPG: FCBF F03D 9ADB B768 8B92 BB52 0341 9037 A875 942D