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Thomas Robers

2018-Jan-23 17:21 UTC

Panic: data stack: Out of memory when allocating bytes

Hello,

I'm using Dovecot 2.3 and sometimes i get this:

--- snip ---
Jan 23 14:23:13 mail dovecot: 
imap(bob at tutech.de)<4880><PDqibHFjMvrAqG1n>: Panic: data stack:
Out of
memory when allocating 134217768 bytes
Jan 23 14:23:13 mail dovecot: 
imap(bob at tutech.de)<4880><PDqibHFjMvrAqG1n>: Fatal: master: 
service(imap): child 4880 killed with signal 6 (core dumped)
--- snip ---

The gdb backtrace is:

--- snip ---
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-92.el6)
Copyright (C) 2010 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 "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/libexec/dovecot/imap...(no debugging symbols 
found)...done.
Attaching to program: /usr/libexec/dovecot/imap, process 4880
ptrace: Kein passender Prozess gefunden.
[New Thread 4880]
Reading symbols from /usr/lib64/dovecot/libdovecot-storage.so.0...(no 
debugging symbols found)...done.
Loaded symbols for /usr/lib64/dovecot/libdovecot-storage.so.0
Reading symbols from /usr/lib64/dovecot/libdovecot.so.0...(no debugging 
symbols found)...done.
Loaded symbols for /usr/lib64/dovecot/libdovecot.so.0
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/librt.so.1...(no debugging symbols 
found)...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /lib64/libdl.so.2...(no debugging symbols 
found)...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols 
found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libpthread.so.0...(no debugging symbols 
found)...done.
[Thread debugging using libthread_db enabled]
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /usr/lib64/dovecot/lib01_acl_plugin.so...(no 
debugging symbols found)...done.
Loaded symbols for /usr/lib64/dovecot/lib01_acl_plugin.so
Reading symbols from /usr/lib64/dovecot/lib02_imap_acl_plugin.so...(no 
debugging symbols found)...done.
Loaded symbols for /usr/lib64/dovecot/lib02_imap_acl_plugin.so
Reading symbols from /usr/lib64/dovecot/lib15_notify_plugin.so...(no 
debugging symbols found)...done.
Loaded symbols for /usr/lib64/dovecot/lib15_notify_plugin.so
Reading symbols from /usr/lib64/dovecot/lib20_mail_log_plugin.so...(no 
debugging symbols found)...done.
Loaded symbols for /usr/lib64/dovecot/lib20_mail_log_plugin.so
Reading symbols from /usr/lib64/dovecot/lib20_zlib_plugin.so...(no 
debugging symbols found)...done.
Loaded symbols for /usr/lib64/dovecot/lib20_zlib_plugin.so
Reading symbols from /lib64/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libz.so.1
Reading symbols from /lib64/libbz2.so.1...(no debugging symbols 
found)...done.
Loaded symbols for /lib64/libbz2.so.1
Reading symbols from /usr/lib64/dovecot/lib30_imap_zlib_plugin.so...(no 
debugging symbols found)...done.
Loaded symbols for /usr/lib64/dovecot/lib30_imap_zlib_plugin.so
Core was generated by `dovecot/imap'.
Program terminated with signal 6, Aborted.
#0  0x00007f73f1386495 in raise () from /lib64/libc.so.6
--- snip ---

I searched for that error message but only found some entries regarding
older dovecot versions and setting "mail_process_size" but i
couldn't
find anything regarding Dovecot Version 2.3. Maybe it's something that 
is fixed already but if so i can't find it. Or is this a configuration 
issue or a bug?

Here my Dovecot configuration:

--- snip ---
# 2.3.0 (c8b89eb): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.0.1 (d33dca20)
# 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
doveadm_password =  # hidden, use -P to show it
doveadm_port = 12345
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
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/master-users
   driver = passwd-file
   master = yes
}
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
   mail_replica = tcp:mail2.tutech.de
   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 sieve
service aggregator {
   fifo_listener replication-notify-fifo {
     mode = 0666
     user = vmail
   }
   unix_listener replication-notify {
     mode = 0666
     user = vmail
   }
}
service auth {
   unix_listener /var/spool/postfix/private/auth {
     mode = 0666
   }
   unix_listener auth-userdb {
     group = vmail
     mode = 0660
     user = vmail
   }
}
service config {
   unix_listener config {
     user = vmail
   }
}
service doveadm {
   inet_listener {
     port = 12345
   }
   user = vmail
}
service imap-login {
   inet_listener imaps {
     port = 993
     ssl = yes
   }
   process_limit = 500
   process_min_avail = 20
}
service imap {
   executable = imap
}
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
}
service replicator {
   unix_listener replicator-doveadm {
     mode = 0666
   }
}
ssl = required
ssl_cert = </etc/pki/dovecot/certs/mail.tutech.de.crt_chain
ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL:!EXPORT
ssl_dh =  # hidden, use -P to show it
ssl_key =  # hidden, use -P to show it
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
}
--- snip ---


Thanks for the help!

Kind regards
Thomas

Josef 'Jeff' Sipek

2018-Jan-23 19:03 UTC

head link

Panic: data stack: Out of memory when allocating bytes

On Tue, Jan 23, 2018 at 18:21:38 +0100, Thomas Robers
wrote:> Hello,
> 
> I'm using Dovecot 2.3 and sometimes i get this:
> 
> --- snip ---
> Jan 23 14:23:13 mail dovecot: imap(bob at
tutech.de)<4880><PDqibHFjMvrAqG1n>:
> Panic: data stack: Out of memory when allocating 134217768 bytes
Interesting... imap is trying to allocate 128MB and failing.  A couple of
questions:

0. Does this user have any unusually large emails?
1. Do you have any idea what the imap process was doing at the time of the
   allocation failure?
2. You snipped all the important parts of the back trace. :)  It *starts* on
   the line:
	#0  0x00007f73f1386495 in raise () from /lib64/libc.so.6
   Having the backtrace should help answer question number 1.
3. How big is this process when it dies?
4. Do you have any sort of ulimit/rlimit set on dovecot in whatever startup
   script you use?
5. Do you use cgroups to limit memory usage?
6. Did you disable memory overcommit on the system?

Jeff.
> Jan 23 14:23:13 mail dovecot: imap(bob at
tutech.de)<4880><PDqibHFjMvrAqG1n>:
> Fatal: master: service(imap): child 4880 killed with signal 6 (core dumped)
> --- snip ---
> 
> The gdb backtrace is:
> 
> --- snip ---
> GNU gdb (GDB) Red Hat Enterprise Linux (7.2-92.el6)
> Copyright (C) 2010 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 "x86_64-redhat-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from /usr/libexec/dovecot/imap...(no debugging symbols
> found)...done.
> Attaching to program: /usr/libexec/dovecot/imap, process 4880
> ptrace: Kein passender Prozess gefunden.
> [New Thread 4880]
> Reading symbols from /usr/lib64/dovecot/libdovecot-storage.so.0...(no
> debugging symbols found)...done.
> Loaded symbols for /usr/lib64/dovecot/libdovecot-storage.so.0
> Reading symbols from /usr/lib64/dovecot/libdovecot.so.0...(no debugging
> symbols found)...done.
> Loaded symbols for /usr/lib64/dovecot/libdovecot.so.0
> Reading symbols from /lib64/libc.so.6...(no debugging symbols
found)...done.
> Loaded symbols for /lib64/libc.so.6
> Reading symbols from /lib64/librt.so.1...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/librt.so.1
> Reading symbols from /lib64/libdl.so.2...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/libdl.so.2
> Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/ld-linux-x86-64.so.2
> Reading symbols from /lib64/libpthread.so.0...(no debugging symbols
> found)...done.
> [Thread debugging using libthread_db enabled]
> Loaded symbols for /lib64/libpthread.so.0
> Reading symbols from /usr/lib64/dovecot/lib01_acl_plugin.so...(no debugging
> symbols found)...done.
> Loaded symbols for /usr/lib64/dovecot/lib01_acl_plugin.so
> Reading symbols from /usr/lib64/dovecot/lib02_imap_acl_plugin.so...(no
> debugging symbols found)...done.
> Loaded symbols for /usr/lib64/dovecot/lib02_imap_acl_plugin.so
> Reading symbols from /usr/lib64/dovecot/lib15_notify_plugin.so...(no
> debugging symbols found)...done.
> Loaded symbols for /usr/lib64/dovecot/lib15_notify_plugin.so
> Reading symbols from /usr/lib64/dovecot/lib20_mail_log_plugin.so...(no
> debugging symbols found)...done.
> Loaded symbols for /usr/lib64/dovecot/lib20_mail_log_plugin.so
> Reading symbols from /usr/lib64/dovecot/lib20_zlib_plugin.so...(no
debugging
> symbols found)...done.
> Loaded symbols for /usr/lib64/dovecot/lib20_zlib_plugin.so
> Reading symbols from /lib64/libz.so.1...(no debugging symbols
found)...done.
> Loaded symbols for /lib64/libz.so.1
> Reading symbols from /lib64/libbz2.so.1...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/libbz2.so.1
> Reading symbols from /usr/lib64/dovecot/lib30_imap_zlib_plugin.so...(no
> debugging symbols found)...done.
> Loaded symbols for /usr/lib64/dovecot/lib30_imap_zlib_plugin.so
> Core was generated by `dovecot/imap'.
> Program terminated with signal 6, Aborted.
> #0  0x00007f73f1386495 in raise () from /lib64/libc.so.6
> --- snip ---
> 
> I searched for that error message but only found some entries regarding
> older dovecot versions and setting "mail_process_size" but i
couldn't
> find anything regarding Dovecot Version 2.3. Maybe it's something that
is
> fixed already but if so i can't find it. Or is this a configuration
issue or
> a bug?
> 
> Here my Dovecot configuration:
> 
> --- snip ---
> # 2.3.0 (c8b89eb): /etc/dovecot/dovecot.conf
> # Pigeonhole version 0.5.0.1 (d33dca20)
> # 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
> doveadm_password =  # hidden, use -P to show it
> doveadm_port = 12345
> 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
> 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/master-users
>   driver = passwd-file
>   master = yes
> }
> 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
>   mail_replica = tcp:mail2.tutech.de
>   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 sieve
> service aggregator {
>   fifo_listener replication-notify-fifo {
>     mode = 0666
>     user = vmail
>   }
>   unix_listener replication-notify {
>     mode = 0666
>     user = vmail
>   }
> }
> service auth {
>   unix_listener /var/spool/postfix/private/auth {
>     mode = 0666
>   }
>   unix_listener auth-userdb {
>     group = vmail
>     mode = 0660
>     user = vmail
>   }
> }
> service config {
>   unix_listener config {
>     user = vmail
>   }
> }
> service doveadm {
>   inet_listener {
>     port = 12345
>   }
>   user = vmail
> }
> service imap-login {
>   inet_listener imaps {
>     port = 993
>     ssl = yes
>   }
>   process_limit = 500
>   process_min_avail = 20
> }
> service imap {
>   executable = imap
> }
> 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
> }
> service replicator {
>   unix_listener replicator-doveadm {
>     mode = 0666
>   }
> }
> ssl = required
> ssl_cert = </etc/pki/dovecot/certs/mail.tutech.de.crt_chain
> ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL:!EXPORT
> ssl_dh =  # hidden, use -P to show it
> ssl_key =  # hidden, use -P to show it
> 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
> }
> --- snip ---
> 
> 
> Thanks for the help!
> 
> Kind regards
> Thomas
> 
-- 
Bad pun of the week: The formula 1 control computer suffered from a race
condition

Josef 'Jeff' Sipek

2018-Jan-23 19:07 UTC

head link

Panic: data stack: Out of memory when allocating bytes

On Tue, Jan 23, 2018 at 14:03:27 -0500, Josef 'Jeff' Sipek
wrote:> On Tue, Jan 23, 2018 at 18:21:38 +0100, Thomas Robers wrote:
> > Hello,
> > 
> > I'm using Dovecot 2.3 and sometimes i get this:
> > 
> > --- snip ---
> > Jan 23 14:23:13 mail dovecot: imap(bob at
tutech.de)<4880><PDqibHFjMvrAqG1n>:
> > Panic: data stack: Out of memory when allocating 134217768 bytes
> 
> Interesting... imap is trying to allocate 128MB and failing.  A couple of
> questions:
> 
> 0. Does this user have any unusually large emails?
> 1. Do you have any idea what the imap process was doing at the time of the
>    allocation failure?
> 2. You snipped all the important parts of the back trace. :)  It *starts*
on
>    the line:
> 	#0  0x00007f73f1386495 in raise () from /lib64/libc.so.6
In case you haven't used gdb before...  after starting up gdb, run "bt
full"
at the gdb prompt.  That'll print out a very detailed backtrace.  (You might
want to sanity check it to make sure there aren't any user passwords in it
before posting it here...)

Jeff.
>    Having the backtrace should help answer question number 1.
> 3. How big is this process when it dies?
> 4. Do you have any sort of ulimit/rlimit set on dovecot in whatever startup
>    script you use?
> 5. Do you use cgroups to limit memory usage?
> 6. Did you disable memory overcommit on the system?
> 
> Jeff.
> 
> > Jan 23 14:23:13 mail dovecot: imap(bob at
tutech.de)<4880><PDqibHFjMvrAqG1n>:
> > Fatal: master: service(imap): child 4880 killed with signal 6 (core
dumped)
> > --- snip ---
> > 
> > The gdb backtrace is:
> > 
> > --- snip ---
> > GNU gdb (GDB) Red Hat Enterprise Linux (7.2-92.el6)
> > Copyright (C) 2010 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 "x86_64-redhat-linux-gnu".
> > For bug reporting instructions, please see:
> > <http://www.gnu.org/software/gdb/bugs/>...
> > Reading symbols from /usr/libexec/dovecot/imap...(no debugging symbols
> > found)...done.
> > Attaching to program: /usr/libexec/dovecot/imap, process 4880
> > ptrace: Kein passender Prozess gefunden.
> > [New Thread 4880]
> > Reading symbols from /usr/lib64/dovecot/libdovecot-storage.so.0...(no
> > debugging symbols found)...done.
> > Loaded symbols for /usr/lib64/dovecot/libdovecot-storage.so.0
> > Reading symbols from /usr/lib64/dovecot/libdovecot.so.0...(no
debugging
> > symbols found)...done.
> > Loaded symbols for /usr/lib64/dovecot/libdovecot.so.0
> > Reading symbols from /lib64/libc.so.6...(no debugging symbols
found)...done.
> > Loaded symbols for /lib64/libc.so.6
> > Reading symbols from /lib64/librt.so.1...(no debugging symbols
> > found)...done.
> > Loaded symbols for /lib64/librt.so.1
> > Reading symbols from /lib64/libdl.so.2...(no debugging symbols
> > found)...done.
> > Loaded symbols for /lib64/libdl.so.2
> > Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging
symbols
> > found)...done.
> > Loaded symbols for /lib64/ld-linux-x86-64.so.2
> > Reading symbols from /lib64/libpthread.so.0...(no debugging symbols
> > found)...done.
> > [Thread debugging using libthread_db enabled]
> > Loaded symbols for /lib64/libpthread.so.0
> > Reading symbols from /usr/lib64/dovecot/lib01_acl_plugin.so...(no
debugging
> > symbols found)...done.
> > Loaded symbols for /usr/lib64/dovecot/lib01_acl_plugin.so
> > Reading symbols from /usr/lib64/dovecot/lib02_imap_acl_plugin.so...(no
> > debugging symbols found)...done.
> > Loaded symbols for /usr/lib64/dovecot/lib02_imap_acl_plugin.so
> > Reading symbols from /usr/lib64/dovecot/lib15_notify_plugin.so...(no
> > debugging symbols found)...done.
> > Loaded symbols for /usr/lib64/dovecot/lib15_notify_plugin.so
> > Reading symbols from /usr/lib64/dovecot/lib20_mail_log_plugin.so...(no
> > debugging symbols found)...done.
> > Loaded symbols for /usr/lib64/dovecot/lib20_mail_log_plugin.so
> > Reading symbols from /usr/lib64/dovecot/lib20_zlib_plugin.so...(no
debugging
> > symbols found)...done.
> > Loaded symbols for /usr/lib64/dovecot/lib20_zlib_plugin.so
> > Reading symbols from /lib64/libz.so.1...(no debugging symbols
found)...done.
> > Loaded symbols for /lib64/libz.so.1
> > Reading symbols from /lib64/libbz2.so.1...(no debugging symbols
> > found)...done.
> > Loaded symbols for /lib64/libbz2.so.1
> > Reading symbols from
/usr/lib64/dovecot/lib30_imap_zlib_plugin.so...(no
> > debugging symbols found)...done.
> > Loaded symbols for /usr/lib64/dovecot/lib30_imap_zlib_plugin.so
> > Core was generated by `dovecot/imap'.
> > Program terminated with signal 6, Aborted.
> > #0  0x00007f73f1386495 in raise () from /lib64/libc.so.6
> > --- snip ---
> > 
> > I searched for that error message but only found some entries
regarding
> > older dovecot versions and setting "mail_process_size" but i
couldn't
> > find anything regarding Dovecot Version 2.3. Maybe it's something
that is
> > fixed already but if so i can't find it. Or is this a
configuration issue or
> > a bug?
> > 
> > Here my Dovecot configuration:
> > 
> > --- snip ---
> > # 2.3.0 (c8b89eb): /etc/dovecot/dovecot.conf
> > # Pigeonhole version 0.5.0.1 (d33dca20)
> > # 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
> > doveadm_password =  # hidden, use -P to show it
> > doveadm_port = 12345
> > 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
> > 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/master-users
> >   driver = passwd-file
> >   master = yes
> > }
> > 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
> >   mail_replica = tcp:mail2.tutech.de
> >   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 sieve
> > service aggregator {
> >   fifo_listener replication-notify-fifo {
> >     mode = 0666
> >     user = vmail
> >   }
> >   unix_listener replication-notify {
> >     mode = 0666
> >     user = vmail
> >   }
> > }
> > service auth {
> >   unix_listener /var/spool/postfix/private/auth {
> >     mode = 0666
> >   }
> >   unix_listener auth-userdb {
> >     group = vmail
> >     mode = 0660
> >     user = vmail
> >   }
> > }
> > service config {
> >   unix_listener config {
> >     user = vmail
> >   }
> > }
> > service doveadm {
> >   inet_listener {
> >     port = 12345
> >   }
> >   user = vmail
> > }
> > service imap-login {
> >   inet_listener imaps {
> >     port = 993
> >     ssl = yes
> >   }
> >   process_limit = 500
> >   process_min_avail = 20
> > }
> > service imap {
> >   executable = imap
> > }
> > 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
> > }
> > service replicator {
> >   unix_listener replicator-doveadm {
> >     mode = 0666
> >   }
> > }
> > ssl = required
> > ssl_cert = </etc/pki/dovecot/certs/mail.tutech.de.crt_chain
> > ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL:!EXPORT
> > ssl_dh =  # hidden, use -P to show it
> > ssl_key =  # hidden, use -P to show it
> > 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
> > }
> > --- snip ---
> > 
> > 
> > Thanks for the help!
> > 
> > Kind regards
> > Thomas
> > 
> 
> -- 
> Bad pun of the week: The formula 1 control computer suffered from a race
> condition
-- 
C is quirky, flawed, and an enormous success.
		- Dennis M. Ritchie.

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