[Dovecot] virtual plugin question

Nikita Koshikov koshikov at gmail.com
Wed Jul 22 16:01:49 EEST 2009 

Hello list,

After enabling virtual plugin in dovecot config, I got imap segmentation faults from time to time.
I can't say what event trigs this behavior, but in logs I see:

Jul 22 13:55:01 dovecot: Error: child 20908 (imap) killed with signal 11 (core dumped)
Jul 22 13:56:43 dovecot: Error: child 19466 (imap) killed with signal 11 (core dumped)
Jul 22 14:06:16 dovecot: Error: child 22629 (imap) killed with signal 11 (core dumped)
Jul 22 14:08:17 dovecot: Error: child 22879 (imap) killed with signal 11 (core dumped)

Here is my config section, which I added to enable virtual plugin:
namespace private {
    prefix = Company/
    separator = /
    location = virtual:/var/mail/virtual
    subscriptions = no
}
and "virtual" to mail_plugins in imap and lda section. Full dovecot -n config provided at the end of this message.
I'm not sure, if it is save to enable virtual location for all users using the same path, but the main goal for me - to create dovecot-virtual files once for all users. Maybe INDEX-es should be personalize for this setup work correct ?

ls -la /var/mail/virtual/
drwxr-xr-x 2 mail mail 4096 Июл 22 15:43 all
drwxr-xr-x 2 mail mail 4096 Июл 22 15:37 favorites
-rw-r--r-- 1 mail mail   14 Июл 22 13:53 .virtual-subscriptions

cat /var/mail/virtual/all/dovecot-virtual 
#all emails
*
  all
cat /var/mail/virtual/favorites/dovecot-virtual 
#Mark messages
*
 flagged

Core dump:

gdb /usr/libexec/dovecot/imap /data/mail/domain.com/koshikov.n/core 
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu"...
(no debugging symbols found)

warning: Can't read pathname for load map: Input/output error.
Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /usr/lib/dovecot/imap/lib10_quota_plugin.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/dovecot/imap/lib10_quota_plugin.so
Reading symbols from /usr/lib/dovecot/imap/lib11_imap_quota_plugin.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/dovecot/imap/lib11_imap_quota_plugin.so
Reading symbols from /usr/lib/dovecot/imap/lib11_trash_plugin.so...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/dovecot/imap/lib11_trash_plugin.so
Reading symbols from /usr/lib/dovecot/imap/lib20_autocreate_plugin.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/dovecot/imap/lib20_autocreate_plugin.so
Reading symbols from /usr/lib/dovecot/imap/lib20_expire_plugin.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/dovecot/imap/lib20_expire_plugin.so
Reading symbols from /usr/lib/dovecot/imap/lib20_virtual_plugin.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/dovecot/imap/lib20_virtual_plugin.so
Reading symbols from /usr/lib/dovecot/imap/lib20_zlib_plugin.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/dovecot/imap/lib20_zlib_plugin.so
Reading symbols from /lib/libz.so.1...
(no debugging symbols found)...done.
Loaded symbols for /lib/libz.so.1
Reading symbols from /lib/libbz2.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libbz2.so.1
(no debugging symbols found)
Core was generated by `imap'.
Program terminated with signal 11, Segmentation fault.
[New process 29801]
#0  0xb7f6157c in ?? () from /usr/lib/dovecot/imap/lib20_virtual_plugin.so
(gdb) bt full
#0  0xb7f6157c in ?? () from /usr/lib/dovecot/imap/lib20_virtual_plugin.so
No symbol table info available.
#1  0x083895d8 in ?? ()
No symbol table info available.
#2  0x00000573 in ?? ()
No symbol table info available.
#3  0xbfbeada0 in ?? ()
No symbol table info available.
#4  0xbfbeadc8 in ?? ()
No symbol table info available.
#5  0xbfbeadeb in ?? ()
No symbol table info available.
#6  0x08389da4 in ?? ()
No symbol table info available.
#7  0xbfbeadb8 in ?? ()
No symbol table info available.
#8  0x08389da8 in ?? ()
No symbol table info available.
#9  0x00000000 in ?? ()
No symbol table info available.

dovecot -n:
# 1.2.1: /etc/dovecot/dovecot.conf
Warning: Growing pool 'settings' with: 8192
# OS: Linux 2.6.26-gentoo-r4 i686 Gentoo Base System release 1.12.11.1 
log_path: /var/log/dovecot/dovecot-error.log
info_log_path: /var/log/dovecot/dovecot.log
protocols: imaps managesieve
ssl_cert_file: /etc/ssl/dovecot/imaps.crt
ssl_key_file: /etc/ssl/dovecot/imaps.key
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_greeting: Server ready.
login_processes_count: 10
login_max_processes_count: 512
first_valid_uid: 8
last_valid_uid: 8
first_valid_gid: 12
last_valid_gid: 12
mail_executable(default): /usr/libexec/dovecot/imap
mail_executable(imap): /usr/libexec/dovecot/imap
mail_executable(managesieve): /usr/libexec/dovecot/managesieve
mail_plugins(default): quota imap_quota trash expire zlib autocreate virtual
mail_plugins(imap): quota imap_quota trash expire zlib autocreate virtual
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
imap_client_workarounds(default): delay-newmail
imap_client_workarounds(imap): delay-newmail
imap_client_workarounds(managesieve): 
namespace:
  type: private
  separator: /
  inbox: yes
  list: yes
  subscriptions: yes
namespace:
  type: private
  separator: /
  prefix: Company/
  location: virtual:/var/mail/virtual
  list: yes
namespace:
  type: public
  separator: /
  prefix: #Public/
  location: maildir:/var/mail/public
  list: yes
auth default:
  mechanisms: plain login
  cache_size: 10240
  cache_negative_ttl: 0
  user: dovecot_auth
  master_user_separator: *
  worker_max_count: 50
  passdb:
    driver: passwd-file
    args: /etc/dovecot/passdb/master.pwd
    master: yes
  passdb:
    driver: passwd-file
    args: /etc/dovecot/passdb/users.pwd
  passdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  userdb:
    driver: prefetch
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-userdb-ldap.conf
  userdb:
    driver: passwd-file
    args: /etc/dovecot/passdb/users.pwd
  socket:
    type: listen
    client:
      path: /var/run/dovecot/auth-client
      mode: 432
      user: mail
      group: dovecot_auth
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: mail
      group: mail
plugin:
  quota_warning: storage=95%% /etc/dovecot/plugins/quota_warning.sh 95
  quota: maildir:Mailbox quota
  quota_rule: *:storage=500M
  quota_rule2: Trash:storage=10%%
  trash: /etc/dovecot/plugins/dovecot-trash.conf
  expire: Trash 30 Spam 30
  expire_dict: proxy::expire
  autocreate: Drafts
  autocreate2: Sent
  autocreate3: Spam
  autocreate4: Trash
  autosubscribe: Drafts
  autosubscribe2: Sent
  autosubscribe3: Spam
  autosubscribe4: Trash
  sieve: ~/.dovecot.sieve
  sieve_dir: ~/sieve
  sieve_before: /etc/dovecot/sieve/default.sieve
dict:
  expire: sqlite:/etc/dovecot/plugins/expire.conf

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