v2.3.1: Event leaked (parent=(nil)): http-client.c:137 and 439

[Milan Knížek]

Hi,

After upgrade to dovecot 2.3.1, many IMAP clients cause errors in 
dovecot log:

May 01 20:15:51 tiger dovecot[21985]: imap: Warning: Event 
0x555fd3c01630 leaked (parent=(nil)): http-client.c:137
May 01 20:15:51 tiger dovecot[21985]: imap: Warning: Event 
0x555fd3c00140 leaked (parent=(nil)): http-client.c:439

Namely:
* roundcube 1.3.3
* offlineimap
* nextcloud mail app

Despite the errors, the basic functionality seems to work - mails are 
received by the client. However, the GUI clients display an "internal 
server error" message window on each refresh.

Some other clients do not create any issues:
* MailDroid (Android)
* getmail

Anybody got a similar behaviour?

--
Milan Knížek | knizek.co...@gmail.com# 2.3.1 (8e2f634): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.1 (d9bc6dfe)
# OS: Linux 4.14.37-1-lts x86_64  
# Hostname: tiger.localdomain
lda_mailbox_autosubscribe = yes
mail_location = maildir:~/Maildir:LAYOUT=fs:DIRNAME=0_mAIL
mail_plugins = fts fts_elasticsearch
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 
mime foreverypart extracttext
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 Trash {
    special_use = \Trash
  }
  prefix = 
  separator = /
}
passdb {
  driver = pam
}
plugin {
  fts = elasticsearch
  fts_autoindex = yes
  fts_decoder = decode2text
  fts_elasticsearch = url=http://tiger:9200/
}
postmaster_address = kni...@volny.cz
protocols = imap
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-master {
    group = postfix
    mode = 0660
    user = postfix
  }
  user = root
}
service decode2text {
  executable = script /usr/lib/dovecot/decode2text.sh
  unix_listener decode2text {
    mode = 0666
  }
  user = dovecot
}
service imap-login {
  inet_listener imap {
    port = 0
  }
}
ssl_cert = </etc/letsencrypt/live/oc.example.org/fullchain.pem
ssl_dh =  # hidden, use -P to show it
ssl_key =  # hidden, use -P to show it
userdb {
  driver = passwd
}
protocol lda {
  mail_plugins = " fts fts_elasticsearch sieve"
}