Dovecot 2.3.0 assertion failure on LMTP delivery

J. Nick Koston nick at cpanel.net
Sat Jan 27 06:58:55 EET 2018


Hi,

We are seeing a frequent assertion failure on LMTP delivery with 2.3.0.  This only appears to happen on CentOS/RHEL 7.

Jan 24 08:30:58 smoker-devautomerge-c7-1 dovecot: lmtp(29540): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 08:30:58 smoker-devautomerge-c7-1 dovecot: lmtp(29540): Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0xc8ec4) [0x7f226d036ec4] -> /usr/lib64/dovecot/libdovecot.so.0(+0xc8f7e) [0x7f226d036f7e] -> /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7f226cfaa190] -> /usr/lib64/dovecot/libdovecot.so.0(+0xe469b) [0x7f226d05269b] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_storage_service_user_unref+0xb4) [0x7f226d334b64] -> dovecot/lmtp(+0x63fa) [0x56438f3673fa] -> dovecot/lmtp(lmtp_local_deinit+0x5c) [0x56438f3678dc] -> dovecot/lmtp(client_state_reset+0x1a) [0x56438f366a5a] -> /usr/lib64/dovecot/libdovecot.so.0(smtp_server_connection_reset_state+0x3c) [0x7f226cfc196c] -> /usr/lib64/dovecot/libdovecot.so.0(smtp_server_command_completed+0x4d) [0x7f226cfbf31d] -> /usr/lib64/dovecot/libdovecot.so.0(+0x54848) [0x7f226cfc2848] -> /usr/lib64/dovecot/libdovecot.so.0(+0xf0970) [0x7f226d05e970] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x65) [0x7f226d04e4b5] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x10f) [0x7f226d04fd8f] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x52) [0x7f226d04e5b2] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f226d04e7d8] -> /usr/lib64/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f226cfccbb3] -> dovecot/lmtp(main+0x226) [0x56438f3661a6] -> /lib64/libc.so.6(__libc_start_main+0xf5) [0x7f226cbccc05] -> dovecot/lmtp(+0x52d5) [0x56438f3662d5]
Jan 24 08:30:58 smoker-devautomerge-c7-1 dovecot: lmtp(29540): Fatal: master: service(lmtp): child 29540 killed with signal 6 (core dumps disabled)


From the exim log:
'LOG: MAIN  cwd=/usr/local/cpanel 3 args: /usr/sbin/sendmail -v bob at l56ob1nf.cptestLOG: MAIN  <= root at smoker-devautomerge-c7-2.dev.cpanel.net U=root P=local S=3146285 T="Ignore this test from Cpanel-Email-Message-Retrieve.t"LOG: MAIN  cwd=/var/spool/exim 4 args: /usr/sbin/exim -v -Mc 1eemjH-0006uB-C2delivering 1eemjH-0006uB-C2  LMTP<< 220 smoker-devautomerge-c7-2.dev.cpanel.net Dovecot ready.  LMTP>> LHLO smoker-devautomerge-c7-2.dev.cpanel.net
  LMTP<< 250-smoker-devautomerge-c7-2.dev.cpanel.net  LMTP<< 250-8BITMIME  LMTP<< 250-CHUNKING  LMTP<< 250-ENHANCEDSTATUSCODES  LMTP<< 250-PIPELINING  LMTP<< 250-STARTTLS  LMTP<< 250-VRFY  LMTP<< 250 XCLIENT ADDR PORT PROTO HELO LOGIN TTL TIMEOUT  LMTP>> MAIL FROM:<root at smoker-devautomerge-c7-2.dev.cpanel.net>
  LMTP<< 250 2.1.0 OK  LMTP>> RCPT TO:<bob at l56ob1nf.cptest>
  LMTP<< 250 2.1.5 OK  LMTP>> DATA
  LMTP<< 354 OK  LMTP>> writing message and terminating "."  LMTP>> QUIT
LOG: MAIN  == bob at l56ob1nf.cptest R=virtual_user T=dovecot_virtual_delivery defer (-1): LMTP connection closed after end of data’,



Jan 24 10:00:55 smoker-devautomerge-c7-1 dovecot: lmtp(30217): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 10:00:55 smoker-devautomerge-c7-1 dovecot: lmtp(30233): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 10:05:15 smoker-devautomerge-c7-1 dovecot: lmtp(32618): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 10:05:52 smoker-devautomerge-c7-1 dovecot: lmtp(375): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 10:05:52 smoker-devautomerge-c7-1 dovecot: lmtp(403): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 10:05:52 smoker-devautomerge-c7-1 dovecot: lmtp(424): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 10:05:52 smoker-devautomerge-c7-1 dovecot: lmtp(430): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 12:32:16 smoker-devautomerge-c7-1 dovecot: lmtp(4435): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 12:54:53 smoker-devautomerge-c7-1 dovecot: lmtp(15232): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 12:54:53 smoker-devautomerge-c7-1 dovecot: lmtp(15238): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)
Jan 24 12:54:53 smoker-devautomerge-c7-1 dovecot: lmtp(15244): Panic: file lib-event.c: line 148 (event_unref): assertion failed: (event != current_global_event)

doveconf -n:

# 2.3.0 (c8b89eb): /etc/dovecot/dovecot.conf
# OS: Linux 3.10.0-693.2.2.el7.x86_64 x86_64 CentOS Linux release 7.4.1708 (Core)  
auth_cache_size = 1 M
auth_mechanisms = plain login
auth_username_chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!#$-=?^_{}~./@+%"
disable_plaintext_auth = no
first_valid_uid = 201
lda_mailbox_autocreate = yes
lmtp_rcpt_check_quota = yes
lmtp_save_to_detail_mailbox = yes
lmtp_user_concurrency_limit = 4
mail_access_groups = dovecot
mail_plugins = quota quota_clone zlib
mail_prefetch_count = 20
maildir_very_dirty_syncs = yes
namespace inbox {
  inbox = yes
  location = 
  mailbox Archive {
    auto = create
    special_use = \Archive
  }
  mailbox Archives {
    auto = no
    special_use = \Archive
  }
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Junk {
    auto = create
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    auto = no
    special_use = \Sent
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  mailbox spam {
    auto = create
    special_use = \Junk
  }
  prefix = INBOX.
  separator = .
  type = private
}
passdb {
  args = /usr/local/cpanel/etc/dovecot/cpauthd-dict.conf
  driver = dict
  result_failure = return-fail
}
passdb {
  args = /usr/local/cpanel/bin/dovecot-wrap
  driver = checkpassword
  skip = authenticated
}
plugin {
  acl = vfile:cache_secs=86400
  quota_exceeded_message = Mailbox is full / Blocks limit exceeded / Inode limit exceeded
}
protocols = lmtp imap pop3
service auth {
  unix_listener auth-client {
    mode = 0666
  }
}
service config {
  vsz_limit = 2 G
}
service dict {
  unix_listener dict {
    group = dovecot
    mode = 0660
  }
}
service imap-login {
  client_limit = 500
  inet_listener imap {
    address = *,::
  }
  inet_listener imaps {
    address = *,::
  }
  process_limit = 50
  process_min_avail = 2
  service_count = 0
  vsz_limit = 128 M
}
service imap {
  process_limit = 512
  vsz_limit = 512 M
}
service lmtp {
  client_limit = 1
  process_limit = 500
  unix_listener lmtp {
    group = mail
    mode = 0660
    user = mailnull
  }
  vsz_limit = 512 M
}
service managesieve-login {
  client_limit = 500
  process_limit = 50
  process_min_avail = 2
  service_count = 0
  vsz_limit = 128 M
}
service managesieve {
  process_limit = 512
  vsz_limit = 512 M
}
service pop3-login {
  client_limit = 500
  inet_listener pop3 {
    address = *,::
  }
  inet_listener pop3s {
    address = *,::
  }
  process_limit = 50
  process_min_avail = 2
  service_count = 0
  vsz_limit = 128 M
}
service pop3 {
  process_limit = 512
  vsz_limit = 512 M
}
service quota-status {
  executable = quota-status -p postfix
  unix_listener quota-status {
    mode = 0666
  }
}
ssl_cert = </etc/dovecot/ssl/dovecot.crt
ssl_cipher_list = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256
ssl_dh =  # hidden, use -P to show it
ssl_key =  # hidden, use -P to show it
userdb {
  driver = prefetch
}
userdb {
  args = /usr/local/cpanel/etc/dovecot/cpauthd-dict.conf
  driver = dict
}
userdb {
  args = /usr/local/cpanel/bin/dovecot-wrap
  driver = checkpassword
}
protocol imap {
  imap_capability = +NAMESPACE
  imap_idle_notify_interval = 24 mins
  imap_logout_format = in=%i, out=%o, bytes=%i/%o
  mail_max_userip_connections = 20
  mail_plugins = acl quota imap_quota zlib imap_zlib quota_clone virtual
  namespace sent {
    hidden = yes
    list = no
    location = virtual:/usr/local/cpanel/etc/dovecot/virtual/sent:INDEX=~/mail/virtual/%u/sent
    prefix = sent
    separator = .
  }
  namespace spam {
    hidden = yes
    list = no
    location = virtual:/usr/local/cpanel/etc/dovecot/virtual/spam:INDEX=~/mail/virtual/%u/spam
    prefix = spam
    separator = .
  }
}
protocol pop3 {
  mail_max_userip_connections = 3
  mail_plugins = quota quota quota_clone virtual zlib
  namespace sent {
    hidden = yes
    list = no
    location = virtual:/usr/local/cpanel/etc/dovecot/virtual/sent:INDEX=~/mail/virtual/%u/sent
    prefix = sent
    separator = .
  }
  namespace spam {
    hidden = yes
    list = no
    location = virtual:/usr/local/cpanel/etc/dovecot/virtual/spam:INDEX=~/mail/virtual/%u/spam
    prefix = spam
    separator = .
  }
  pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s, bytes=%i/%o
  pop3_uidl_format = UID%u-%v
}
protocol lmtp {
  mail_plugins = quota quota_clone zlib
  postmaster_address = root
  quota_full_tempfail = no
}
protocol lda {
  mail_plugins = quota quota_clone zlib
  postmaster_address = root
  quota_full_tempfail = no
}
local_name smoker-devautomerge-c7-1.dev.cpanel.net {
  ssl_cert = </etc/dovecot/ssl/dovecot.crt
  ssl_key =  # hidden, use -P to show it
}




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