[Dovecot] Segfault on antispam plugin

[Allan Cassaro]

Hi Johanners Berg,

I put the antispam plugin to work (some days ago) and now my imap
daemon dies with segfault.
I don't have nothing (wrong) in logs, just a lot of segfaults...

Dec 10 15:37:21 curie kernel: printk: 22 messages suppressed.
Dec 10 15:37:21 curie kernel: imap[4774]: segfault at 8 rip
2afe7fe7d7ff rsp 7fff2b9bdab0 error 6
Dec 10 15:37:21 curie kernel: imap[4779]: segfault at 8 rip
2ab0a1d777ff rsp 7fff09ac3bb0 error 6
Dec 10 15:37:22 curie kernel: imap[4784]: segfault at 8 rip
2ae348d837ff rsp 7fff62ab5bb0 error 6
Dec 10 15:37:22 curie kernel: imap[4790]: segfault at 8 rip
2b8744ede7ff rsp 7fff6695aa50 error 6
Dec 10 15:37:22 curie kernel: imap[4795]: segfault at 8 rip
2b400f6f67ff rsp 7fff9c142240 error 6
Dec 10 15:37:22 curie kernel: imap[4800]: segfault at 8 rip
2b00a4e7b7ff rsp 7fff069bd700 error 6
Dec 10 15:37:22 curie kernel: imap[4831]: segfault at 8 rip
2b95b8d9a7ff rsp 7ffff2a9eb90 error 6
Dec 10 15:37:23 curie kernel: imap[4841]: segfault at 8 rip
2ae6189f47ff rsp 7fff92e44f40 error 6
Dec 10 15:37:23 curie kernel: imap[4846]: segfault at 8 rip
2ab739e6f7ff rsp 7fff719cbac0 error 6
Dec 10 15:37:23 curie kernel: imap[4851]: segfault at 8 rip
2b08611a07ff rsp 7fff4a698790 error 6
Dec 10 15:37:26 curie kernel: printk: 11 messages suppressed.
Dec 10 15:37:26 curie kernel: imap[4932]: segfault at 8 rip
2b228ab857ff rsp 7fff20cb3db0 error 6
Dec 10 15:37:31 curie kernel: printk: 17 messages suppressed.
Dec 10 15:37:31 curie kernel: imap[5043]: segfault at 8 rip
2ac4c3bea7ff rsp 7fffe7c50d40 error 6
Dec 10 15:37:36 curie kernel: printk: 16 messages suppressed.
Dec 10 15:37:36 curie kernel: imap[5196]: segfault at 8 rip
2b66601167ff rsp 7fff4b724820 error 6
Dec 10 15:37:41 curie kernel: printk: 15 messages suppressed.
Dec 10 15:37:41 curie kernel: imap[5319]: segfault at 8 rip
2ad13a7b47ff rsp 7fff71086180 error 6
Dec 10 15:37:46 curie kernel: printk: 15 messages suppressed.
Dec 10 15:37:46 curie kernel: imap[5427]: segfault at 8 rip
2b99f6b5b7ff rsp 7fffb4cdddd0 error 6

When I disable the antispam plugin, everithing works as normal...

My config:
AMD Opteron(tm) Processor 285 (x86_64)
gcc (GCC) 4.2.4 20080512 (prerelease) (Debian 4.2.3-6)
Linux 2.6.24-1-amd64 #1 SMP Fri Apr 18 23:08:22 UTC 2008 x86_64 GNU/Linux

dovecot -n
# 1.1.7: /etc/dovecot/dovecot.conf
Warning: fd limit 1024 is lower than what Dovecot can use under full
load (more than 1456). Either grow the limit or change
login_max_processes_count and max_mail_processes settings
# OS: Linux 2.6.24-1-amd64 x86_64 Debian lenny/sid
base_dir: /var/run/dovecot/
protocols: imap imaps managesieve
listen(default): *
listen(imap): *
listen(managesieve): *:2000
disable_plaintext_auth: no
login_dir: /var/run/dovecot//login
login_executable(default): /usr/libexec/dovecot/imap-login
login_executable(imap): /usr/libexec/dovecot/imap-login
login_executable(managesieve): /usr/libexec/dovecot/managesieve-login
login_process_per_connection: no
login_process_size: 512
login_processes_count: 10
login_max_connections: 120
max_mail_processes: 1200
first_valid_uid: 1010
last_valid_uid: 1010
mail_uid: vmail
mail_gid: vmail
mail_location: maildir:~/Maildir
mail_cache_fields: flags, date.sent, date.received, size.virtual,
size.physical
mail_cache_min_mail_count: 30
mailbox_idle_check_interval: 10
mail_drop_priv_before_exec: yes
mail_executable(default): /usr/libexec/dovecot/postlogin
mail_executable(imap): /usr/libexec/dovecot/postlogin
mail_executable(managesieve): /usr/libexec/dovecot/managesieve-fix.sh
mail_plugins(default): quota imap_quota acl antispam
mail_plugins(imap): quota imap_quota acl antispam
mail_plugins(managesieve):
mail_plugin_dir(default): /usr/lib/dovecot/imap
mail_plugin_dir(imap): /usr/lib/dovecot/imap
mail_plugin_dir(managesieve): /usr/lib/dovecot/managesieve
managesieve_implementation_string(default): dovecot
managesieve_implementation_string(imap): dovecot
managesieve_implementation_string(managesieve): Dovecot ManageSieve
1.1
sieve_storage(default):
sieve_storage(imap):
sieve_storage(managesieve): ~/sieve
sieve(default):
sieve(imap):
sieve(managesieve): ~/.dovecot.sieve
namespace:
  type: private
  separator: .
  prefix: INBOX.
  inbox: yes
  list: yes
  subscriptions: yes
auth default_with_listener:
  mechanisms: plain login
  cache_size: 512
  cache_ttl: 30
  cache_negative_ttl: 0
  passdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: vmail
      group: vmail
plugin:
  sieve: ~/.dovecot.sieve
  acl: vfile:/etc/dovecot/dovecot-acls
  quota: maildir
  quota_exceeded_message: Quota excedida (caixa de entrada cheia)
  quota_rule: *:storage=100MB
  quota_rule2: Trash:storage=20%%
  quota_rule3: Spam:ignore
  quota_warning: storage=95%% /usr/libexec/dovecot/quota_warning.sh %u 95
  quota_warning2: storage=80%% /usr/libexec/dovecot/quota_warning.sh %u 80
  antispam_spam: Bloqueados
  antispam_mail_sendmail: /usr/libexec/dovecot/blockthis.py
  antispam_mail_sendmail_args: -u;%u
  antispam_mail_spam: -a
  antispam_mail_notspam: -d
  mail_log_events: delete undelete expunge copy mailbox_delete mailbox_rename
  mail_log_group_events:
  mail_log_fields: uid box msgid size

I can't increase these number! I already alter the limits.conf, the
ulimit.. and nothing seens to work...
Warning: fd limit 1024 is lower than what Dovecot can use under full
load (more than 1456). Either grow the limit or change
login_max_processes_count and max_mail_processes settings

Regards.