[Dovecot] Imap process killed

Hi,

I get the following message each time I try to access a mailbox.

dovecot: [ID 684838 mail.error] child 27041 (imap) killed with signal 11

Using dovecot 1.0-test32 under Solaris 9.

Using truss I get the following lines:

27041: read(0, " 2 s e l e c t " I N".., 4096) = 18 27041: open64("/var/mail/toto", O_RDWR|O_CREAT|O_EXCL, 0660) Err#17 EEXIST 27041: time() = 1092672589 27041: open64("", O_RDWR) Err#14 EFAULT 27041: Incurred fault #6, FLTBOUNDS %pc = 0xFF1B347C 27041: siginfo: SIGSEGV SEGV_MAPERR addr=0x00000000 27041: Received signal #11, SIGSEGV [default] 27041: siginfo: SIGSEGV SEGV_MAPERR addr=0x00000000

I attached the complete result of the truss command and my configuration file.

Any idea what is the problem ?

Cheers,

Yann

## Dovecot 1.0 configuration file

# '#' character and everything after it is treated as comments. Extra spaces # and tabs are ignored. If you want to use either of these explicitly, put the # value inside quotes, eg.: key = "# char and trailing whitespace "

# Default values are shown after each value, it's not required to uncomment # any of the lines. Exception to this are paths, they're just examples # with real defaults being based on configure options. The paths listed here # are for configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var # --with-ssldir=/etc/ssl

# Base directory where to store runtime data. base_dir = /var/run/dovecot/

# Protocols we want to be serving: # imap imaps pop3 pop3s protocols = imap

# IP or host address where to listen in for connections. It's not currently # possible to specify multiple addresses. "*" listens in all IPv4 interfaces. # "[::]" listens in all IPv6 interfaces, but may also listen in all IPv4 # interfaces depending on the operating system. You can specify ports with # "host:port", although with multiple protocols you probably want to move this # setting inside protocol imap/pop3 { ... } section, so you can specify # different ports for IMAP/POP3. #listen = *

# IP or host address where to listen in for SSL connections. Defaults # to above if not specified. #ssl_listen =

# Disable SSL/TLS support. ssl_disable = yes

# PEM encoded X.509 SSL/TLS certificate and private key. They're opened before # dropping root privileges, so keep the key file unreadable by anyone but # root. Included doc/mkcert.sh can be used to easily generate self-signed # certificate, just make sure to update the domains in dovecot-openssl.cnf ssl_cert_file = /usr/local/public/ssl/certs/imapd.pem ssl_key_file = /usr/local/public/ssl/certs/imapd.pem

# File containing trusted SSL certificate authorities. Usually not needed. #ssl_ca_file =

# Request client to send a certificate. #ssl_verify_client_cert = no

# SSL parameter file. Master process generates this file for login processes. # It contains Diffie Hellman and RSA parameters. #ssl_parameters_file = /var/run/dovecot/ssl-parameters.dat

# How often to regenerate the SSL parameters file. Generation is quite CPU # intensive operation. The value is in hours, 0 disables regeneration # entirely. #ssl_parameters_regenerate = 24

# SSL ciphers to use #ssl_cipher_list = all:!low

# Disable LOGIN command and all other plaintext authentications unless # SSL/TLS is used (LOGINDISABLED capability). Note that 127.*.*.* and # IPv6 ::1 addresses are considered secure, this setting has no effect if # you connect from those addresses. disable_plaintext_auth = no

# Use this logfile instead of syslog(). /dev/stderr can be used if you want to # use stderr for logging (ONLY /dev/stderr - otherwise it is closed). #log_path =

# For informational messages, use this logfile instead of the default #info_log_path =

# Prefix for each line written to log file. % codes are in strftime(3) # format. #log_timestamp = "%b %d %H:%M:%S "

## ## Login processes ##

# Directory where authentication process places authentication UNIX sockets # which login needs to be able to connect to. The sockets are created when # running as root, so you don't have to worry about permissions. Note that # everything in this directory is deleted when Dovecot is started. #login_dir = /var/run/dovecot/login

# chroot login process to the login_dir. Only reason not to do this is if you # wish to run the whole Dovecot without roots. login_chroot = no

# User to use for the login process. Create a completely new user for this, # and don't use it anywhere else. The user must also belong to a group where # only it has access, it's used to control access for authentication process. #login_user = dovecot

# Set max. process size in megabytes. If you don't use # login_process_per_connection you might need to grow this. #login_process_size = 32

# Should each login be processed in it's own process (yes), or should one # login process be allowed to process multiple connections (no)? Yes is more # secure, espcially with SSL/TLS enabled. No is faster since there's no need # to create processes all the time. #login_process_per_connection = yes

# Number of login processes to create. If login_process_per_user is # yes, this is the number of extra processes waiting for users to log in. #login_processes_count = 3

# Maximum number of extra login processes to create. The extra process count # usually stays at login_processes_count, but when multiple users start logging # in at the same time more extra processes are created. To prevent fork-bombing # we check only once in a second if new processes should be created - if all # of them are used at the time, we double their amount until limit set by this # setting is reached. This setting is used only if login_process_per_use is yes. #login_max_processes_count = 128

# Maximum number of connections allowed in login state. When this limit is # reached, the oldest connections are dropped. If login_process_per_user # is no, this is a per-process value, so the absolute maximum number of users # logging in actually login_processes_count * max_logging_users. #login_max_logging_users = 256

## ## Mail processes ##

# Maximum number of running mail processes. When this limit is reached, # new users aren't allowed to log in. #max_mail_processes = 1024

# Show more verbose process titles (in ps). Currently shows user name and # IP address. Useful for seeing who are actually using the IMAP processes # (eg. shared mailboxes or if same uid is used for multiple accounts). #verbose_proctitle = no

# Show protocol level SSL errors. #verbose_ssl = no

# Valid UID range for users, defaults to 500 and above. This is mostly # to make sure that users can't log in as daemons or other system users. # Note that denying root logins is hardcoded to dovecot binary and can't # be done even if first_valid_uid is set to 0. first_valid_uid = 200 last_valid_uid = 0

# Valid GID range for users, defaults to non-root/wheel. Users having # non-valid GID as primary group ID aren't allowed to log in. If user # belongs to supplementary groups with non-valid GIDs, those groups are # not set. #first_valid_gid = 1 #last_valid_gid = 0

# Grant access to these extra groups for mail processes. Typical use would be # to give "mail" group write access to /var/mail to be able to create dotlocks. #mail_extra_groups =

# ':' separated list of directories under which chrooting is allowed for mail # processes (ie. /var/mail will allow chrooting to /var/mail/foo/bar too). # This setting doesn't affect login_chroot or auth_chroot variables. # WARNING: Never add directories here which local users can modify, that # may lead to root exploit. Usually this should be done only if you don't # allow shell access for users. See doc/configuration.txt for more information. #valid_chroot_dirs =

# Default chroot directory for mail processes. This can be overridden by # giving /./ in user's home directory (eg. /home/./user chroots into /home). #mail_chroot =

# Default MAIL environment to use when it's not set. By leaving this empty # dovecot tries to do some automatic detection as described in # doc/mail-storages.txt. There's a few special variables you can use, eg.: # # %u - username # %n - user part in user@domain, same as %u if there's no domain # %d - domain part in user@domain, empty if user there's no domain # %h - home directory # # See doc/variables.txt for full list. Some examples: # # default_mail_env = maildir:/var/mail/%1u/%u/Maildir # default_mail_env = mbox:~/mail/:INBOX=/var/mail/%u # default_mail_env = mbox:/var/mail/%d/%n/:INDEX=/var/indexes/%d/%n # default_mail_env = mbox:~/mail/:INBOX=/var/mail/%u:INDEX=MEMORY

# Space-separated list of fields to cache for all mails. Currently these # fields are allowed followed by a list of commands they speed up: # # Envelope - FETCH ENVELOPE and SEARCH FROM, TO, CC, BCC, SUBJECT, # SENTBEFORE, SENTON, SENTSINCE, HEADER MESSAGE-ID, # HEADER IN-REPLY-TO # Body - FETCH BODY # Bodystructure - FETCH BODY, BODYSTRUCTURE # MessagePart - FETCH BODY[1.2.3] (ie. body parts), RFC822.SIZE, # SEARCH SMALLER, LARGER, also speeds up BODY/BODYSTRUCTURE # generation. This is always set with mbox mailboxes, and # also default with Maildir. # # Different IMAP clients work in different ways, that's why Dovecot by default # only caches MessagePart which speeds up most operations. Whenever client # does something where caching could be used, the field is automatically marked # to be cached later. For example after FETCH BODY the BODY will be cached # for all new messages. Normally you should leave this alone, unless you know # what most of your IMAP clients are. Caching more fields than needed makes # the index files larger and generate useless I/O. # # With maildir there's one extra optimization - if nothing is cached, indexing # the maildir becomes much faster since it's not opening any of the mail files. # This could be useful if your IMAP clients access only new mails.

#mail_cache_fields = MessagePart

# Space-separated list of fields that Dovecot should never set to be cached. # Useful if you want to save disk space at the cost of more I/O when the fields # needed. #mail_never_cache_fields =

# Dovecot can notify client of new mail in selected mailbox soon after it's # received. This setting specifies the minimum interval in seconds between # new mail notifications to client - internally they may be checked more or # less often. Setting this to 0 disables the checking. # NOTE: Evolution client breaks with this option when it's trying to APPEND. #mailbox_check_interval = 0

# Like mailbox_check_interval, but used for IDLE command. #mailbox_idle_check_interval = 30

# Allow full filesystem access to clients. There's no access checks other than # what the operating system does for the active UID/GID. It works with both # maildir and mboxes, allowing you to prefix mailboxes names with eg. /path/ # or ~user/. #mail_full_filesystem_access = no

# Maximum allowed length for mail keyword name. It's only forced when trying # to create new keywords. #mail_max_keyword_length = 50

# Save mails with CR+LF instead of plain LF. This makes sending those mails # take less CPU, especially with sendfile() syscall with Linux and FreeBSD. # But it also creates a bit more disk I/O which may just make it slower. #mail_save_crlf = no

# Use mmap() instead of read() to read mail files. read() seems to be a bit # faster with my Linux/x86 and it's better with NFS, so that's the default. # Note that OpenBSD 3.3 and older don't work right with mail_read_mmaped = yes. #mail_read_mmaped = no

# Don't use mmap() at all. This is required if you store indexes in remote # filesystems (NFS or clustered filesystem). #mmap_disable = no

# Don't write() to mmaped files. This is required for some operating systems # which use separate caches for them, such as OpenBSD. #mmap_no_write = no

# Don't use fcntl() locking. Alternatives are dotlocking and other tricks # which may be slower. Required for NFS. fcntl_locks_disable = yes

# By default LIST command returns all entries in maildir beginning with dot. # Enabling this option makes Dovecot return only entries which are directories. # This is done by stat()ing each entry, so it causes more disk I/O. # (For systems setting struct dirent->d_type, this check is free and it's # done always regardless of this setting) #maildir_stat_dirs = no

# Copy mail to another folders using hard links. This is much faster than # actually copying the file. This is problematic only if something modifies # the mail in one folder but doesn't want it modified in the others. I don't # know any MUA which would modify mail files directly. IMAP protocol also # requires that the mails don't change, so it would be problematic in any case. # If you care about performance, enable it. #maildir_copy_with_hardlinks = no

# Check if mails' content has been changed by external programs. This slows # down things as extra stat() needs to be called for each file. If changes are # noticed, the message is treated as a new message, since IMAP protocol # specifies that existing messages are immutable. #maildir_check_content_changes = no

# Which locking methods to use for locking mbox. There's four available: # dotlock: Create <mailbox>.lock file. This is the oldest and most NFS-safe # solution. If you want to use /var/mail/ like directory, the users # will need write access to that directory. # fcntl : Use this if possible. Works with NFS too if lockd is used. # flock : May not exist in all systems. Doesn't work with NFS. # lockf : May not exist in all systems. Doesn't work with NFS. # # You can use multiple locking methods; if you do the order they're declared # in is important to avoid deadlocks if other MTAs/MUAs are using multiple # locking methods as well. Some operating systems don't allow using some of # them simultaneously. #mbox_read_locks = fcntl #mbox_write_locks = dotlock fcntl

# Maximum time in seconds to wait for lock (all of them) before aborting. #mbox_lock_timeout = 300

# If dotlock exists but the mailbox isn't modified in any way, override the # lock file after this many seconds. #mbox_dotlock_change_timeout = 30

# umask to use for mail files and directories #umask = 0077

# Drop all privileges before exec()ing the mail process. This is mostly # meant for debugging, otherwise you don't get core dumps. It could be a small # security risk if you use single UID for multiple users, as the users could # ptrace() each others processes then. #mail_drop_priv_before_exec = no

# Set max. process size in megabytes. Most of the memory goes to mmap()ing # files, so it shouldn't harm much even if this limit is set pretty high. #mail_process_size = 256

# Log prefix for mail processes. See doc/variables.txt for list of possible # variables you can use. #mail_log_prefix = "%Up(%u): "

## ## IMAP specific settings ##

protocol imap { # Login executable location. #login_executable = /usr/libexec/dovecot/imap-login

# IMAP executable location #mail_executable = /usr/libexec/dovecot/imap # This would write rawlogs into ~/dovecot.rawlog/ directory: #mail_executable = /usr/libexec/dovecot/rawlog /usr/libexec/dovecot/imap

# Maximum IMAP command line length in bytes. Some clients generate very long # command lines with huge mailboxes, so you may need to raise this if you get # "Too long argument" or "IMAP command line too large" errors often. #imap_max_line_length = 65536

# Support for dynamically loadable modules. #mail_use_modules = no #mail_modules = /usr/lib/dovecot/imap

# Workarounds for various client bugs: # oe6-fetch-no-newmail: # Never send EXISTS/RECENT when replying to FETCH command. Outlook Express # seems to think they are FETCH replies and gives user "Message no longer # in server" error. Note that OE6 still breaks even with this workaround # if synchronization is set to "Headers Only". # outlook-idle: # Outlook and Outlook Express never abort IDLE command, so if no mail # arrives in half a hour, Dovecot closes the connection. This is still # fine, except Outlook doesn't connect back so you don't see if new mail # arrives. #imap_client_workarounds = }

## ## POP3 specific settings ##

protocol pop3 { # Login executable location. #login_executable = /usr/libexec/dovecot/pop3-login

# POP3 executable location #mail_executable = /usr/libexec/dovecot/pop3

# Don't try to set mails non-recent with POP3 sessions. This is mostly # intended to reduce disk I/O. With maildir it doesn't move files from # new/ to cur/, with mbox it doesn't write Status-header. #pop3_mails_keep_recent = no

# Support for dynamically loadable modules. #mail_use_modules = no #mail_modules = /usr/lib/dovecot/pop3

# Workarounds for various client bugs: # outlook-no-nuls: # Outlook and Outlook Express hang if mails contain NUL characters. # This setting replaces them with 0x80 character. #pop3_client_workarounds = }

## ## Authentication processes ##

# You can have multiple authentication processes. With plaintext authentication # the password is checked against each process, the first one which succeeds is # used. This is useful if you want to allow both system users (/etc/passwd) # and virtual users to login without duplicating the system users into virtual # database.

# Executable location #auth_executable = /usr/libexec/dovecot/dovecot-auth

# Set max. process size in megabytes. #auth_process_size = 256

# Space separated list of realms for SASL authentication mechanisms that need # them. You can leave it empty if you don't want to support multiple realms. # Many clients simply use the first one listed here, so keep the default realm # first. #auth_realms =

# Default realm/domain to use if none was specified. This is used for both # SASL realms and appending @domain to username in plaintext logins. #auth_default_realm =

# List of allowed characters in username. If the user-given username contains # a character not listed in here, the login automatically fails. This is just # an extra check to make sure user can't exploit any potential quote escaping # vulnerabilities with SQL/LDAP databases. If you want to allow all characters, # set this value to empty. #auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@

# Username to use for users logging in with ANONYMOUS SASL mechanism #auth_anonymous_username = anonymous

# More verbose logging. Useful for figuring out why authentication isn't # working. #auth_verbose = no

auth default { # Space separated list of wanted authentication mechanisms: # plain digest-md5 cram-md5 apop anonymous mechanisms = plain

# Where user database is kept: # passwd: /etc/passwd or similiar, using getpwnam() # passwd-file <path>: passwd-like file with specified location # static uid=<uid> gid=<gid> home=<dir template>: static settings # vpopmail: vpopmail library # ldap <config path>: LDAP, see doc/dovecot-ldap.conf # pgsql <config path>: a PostgreSQL database, see doc/dovecot-pgsql.conf # mysql <config path>: a MySQL database, see doc/dovecot-mysql.conf userdb = passwd

# Where password database is kept: # passwd: /etc/passwd or similiar, using getpwnam() # shadow: /etc/shadow or similiar, using getspnam() # pam [<service> | *]: PAM authentication # checkpassword <path>: checkpassword executable authentication # passwd-file <path>: passwd-like file with specified location # vpopmail: vpopmail authentication # ldap <config path>: LDAP, see doc/dovecot-ldap.conf # pgsql <config path>: a PostgreSQL database, see doc/dovecot-pgsql.conf # mysql <config path>: a MySQL database, see doc/dovecot-mysql.conf passdb = pam

# User to use for the process. This user needs access to only user and # password databases, nothing else. Only shadow and pam authentication # requires roots, so use something else if possible. Note that passwd # authentication with BSDs internally accesses shadow files, which also # requires roots. user = root

# Directory where to chroot the process. Most authentication backends don't # work if this is set, and there's no point chrooting if auth_user is root. #chroot =

# Number of authentication processes to create #count = 1

# Require a valid SSL client certificate or the authentication fails. #ssl_require_client_cert = no }

# PAM doesn't provide a way to get uid, gid or home directory. If you don't # want to use a separate user database (passwd usually), you can use static # userdb.

#auth onlypam { # mechanisms = plain # userdb = static uid=500 gid=500 home=/var/mail/%u # passdb = pam # user = dovecot-auth #}

#auth ldap { # mechanisms = plain # userdb = ldap /etc/dovecot-ldap.conf # passdb = ldap /etc/dovecot-ldap.conf # user = dovecot-auth #}

#auth virtualfile { # mechanisms = plain digest-md5 # userdb = passwd-file /etc/passwd.imap # passdb = passwd-file /etc/passwd.imap # user = dovecot-auth #}

# It's possible to export the authentication interface to other programs, # for example SMTP server which supports talking to Dovecot. Client socket # handles the actual authentication - you give it a username and password # and it returns OK or failure. So it's pretty safe to allow anyone access to # it. Master socket is used to a) query if given client was successfully # authenticated, b) userdb lookups.

# listener sockets will be created by Dovecot's master process using the # settings given inside the auth section #auth default_with_listener { # mechanisms = plain # passdb = passwd # userdb = pam # socket listen { # master { # path = /var/run/dovecot/auth-master # #mode = 0600 # # Default user/group is the one who started dovecot-auth (root) # #user = # #group = # } # client { # path = /var/run/dovecot-auth-client # mode = 0660 # } # } #}

# connect sockets are assumed to be already running, Dovecot's master # process only tries to connect to them. They don't need any other settings # than path for the master socket, as the configuration is done elsewhere. # Note that the client sockets must exist in login_dir. #auth external { # socket connect { # master { # path = /var/run/dovecot/auth-master # } # } #}