[Dovecot] Segfault on antispam plugin

[Allan Cassaro]

On Wed, Dec 10, 2008 at 3:46 PM, Allan Cassaro <allan.cassaro at gmail.com> wrote:
> 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
>

After some tests, I discover that this error only occurs when the
number of process excced file descriptors.
So, I can do anything to fix this?
(Raise FD? Yes, but why? Sugestions? I do everything that I found on google...)

Regards.