rawlog segfaults (error 4 in libdovecot.so.0.0.0)

[Aki Tuomi]

rawlog files are plain text, readable files. you do not need to dump
them with doveadm. can you get gdb "bt full" for the core file?

Aki

On 10.11.2017 11:35, T. Robers wrote:
> Hello everybody,
>
> i tried to debug imap sessions with the rawlog feature and rawlog
> creates files but when i try to dump them doveadm tells me
> [...] Error: zlib.read((file)): unexpected EOF at [...].
> I looked at syslog files and i see, that rawlog gets
> terminated with a segfault, e.g.:
>
> segfault at 10 ip 00007ff6da362596 sp 00007fffe725a080 error 4 in
> libdovecot.so.0.0.0[7ff6da2a4000+122000]
>
> Is there a way to debug why rawlog ist terminated? I haven't found
> anything.I would be very thankful, if somebody could give a hint.
>
> My system is:
>
> # 2.2.33.2 (d6601f4ec): /etc/dovecot/dovecot.conf
> # Pigeonhole version 0.4.21 (92477967)
> # OS: Linux 2.6.32-696.3.1.el6.x86_64 x86_64 CentOS release 6.9
> (Final) ext4
> auth_debug = yes
> auth_debug_passwords = yes
> auth_master_user_separator = *
> auth_mechanisms = plain login
> auth_verbose = yes
> disable_plaintext_auth = no
> imap_max_line_length = 2 M
> mail_debug = yes
> mail_location = maildir:/export/home/imap/%Lu/Maildir
> mail_plugins = acl zlib mail_log notify
> mailbox_idle_check_interval = 10 secs
> mailbox_list_index = yes
> 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 {
>   hidden = no
>   ignore_on_failure = no
>   inbox = no
>   list = children
>   location = maildir:%%h/Maildir:INDEXPVT=%h/shared/%%u
>   prefix = shared/%%u/
>   separator = /
>   subscriptions = yes
>   type = shared
> }
> namespace inbox {
>   hidden = no
>   inbox = yes
>   list = 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 = INBOX/
>   separator = /
>   type = private
> }
> passdb {
>   args = /etc/dovecot/dovecot-ldap.conf.ext
>   driver = ldap
> }
> plugin {
>   acl = vfile:/etc/dovecot/global-acls:cache_secs=300
>   acl_shared_dict = file:/export/home/shared-db/shared-mailboxes
>   mail_log_events = append delete undelete expunge copy mailbox_delete
> mailbox_rename flag_change
>   mail_log_fields = uid box msgid size from flags
>   sieve = ~/.dovecot.sieve
>   sieve_dir = ~/sieve
>   sieve_global = /var/lib/dovecot/sieve/global/
>   sieve_user_log = ~/.dovecot.sieve.log
>   zlib_save = gz
>   zlib_save_level = 6
> }
> protocols = imap pop3 lmtp sieve
> service auth {
>   unix_listener /var/spool/postfix/private/auth {
>     mode = 0666
>   }
>   unix_listener auth-userdb {
>     group = vmail
>     mode = 0660
>     user = vmail
>   }
> }
> service imap-login {
>   inet_listener imap {
>     port = 143
>   }
>   inet_listener imaps {
>     port = 993
>     ssl = yes
>   }
>   process_limit = 500
>   process_min_avail = 20
> }
> service imap {
>   executable = imap postlogin
> }
> service lmtp {
>   inet_listener lmtp {
>     address = 127.0.0.1
>     port = 24
>   }
> }
>
> service managesieve-login {
>   inet_listener sieve {
>     port = 4190
>   }
>   inet_listener sieve_deprecated {
>     port = 2000
>   }
> }
> service pop3-login {
>   inet_listener pop3s {
>     port = 995
>     ssl = yes
>   }
> }
> service pop3 {
>   executable = pop3 postlogin
> }
> service postlogin {
>   executable = script-login -d rawlog -f in
> }
> ssl = required
> ssl_cert = </etc/pki/dovecot/certs/mail.tutech.de.crt_chain
> ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL:!EXPORT
> ssl_key =  # hidden, use -P to show it
> ssl_protocols = !SSLv3 !SSLv2
> syslog_facility = local6
> userdb {
>   args = /etc/dovecot/dovecot-ldap-userdb.conf.ext
>   driver = ldap
> }
> protocol lmtp {
>   mail_plugins = acl zlib mail_log notify sieve
> }
> protocol imap {
>   mail_max_userip_connections = 100
>   mail_plugins = acl zlib mail_log notify imap_zlib imap_acl
>   rawlog_dir = /tmp/rawlog/%u
> }
>
>
> Tia
> Thomas