Panic: file ostream-zlib.c: line 36 (o_stream_zlib_close): assertion failed:

18 Jan 2018


      Hi,
after updating Dovecot to version 2.3 I get a lot of core-dumps like:
...
Jan 18 10:08:20 mail dovecot: imap(bob@tutech.de)<18200><CIPhNwljJcdYS/hg>: Panic: file ostream-zlib.c: line 36 (o_stream_zlib_close): assertion failed: (zstream->ostream.finished ||
zstream->ostream.ostream.stream_errno != 0)
Jan 18 10:08:20 mail dovecot: imap(bob@tutech.de)<18200><CIPhNwljJcdYS/hg>: Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0xc71da) [0x7f9b510c81da] -> /usr/lib64/dovecot
/libdovecot.so.0(+0xc7766) [0x7f9b510c8766] -> /usr/lib64/dovecot/libdovecot.so.0(+0x3be11) [0x7f9b5103ce11] -> /usr/lib64/dovecot/lib20_zlib_plugin.so(+0x4ffb) [0x7f9b4fc21ffb] ->
/usr/lib64/dovecot/libdovecot.so.0(+0xed3a6) [0x7f9b510ee3a6] -> dovecot/imap(client_disconnect+0x4f) [0x7f9b518f3a1f] -> dovecot/imap(cmd_logout+0x5b) [0x7f9b518ede5b] ->
dovecot/imap(command_exec+0x65) [0x7f9b518f7585] -> dovecot/imap(+0x1a7b0) [0x7f9b518f47b0] -> dovecot/imap(+0x1a848) [0x7f9b518f4848] -> dovecot/imap(client_handle_input+0x1d5)
[0x7f9b518f4c35] -> dovecot/imap(client_input+0x6e) [0x7f9b518f517e] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x55) [0x7f9b510deec5] -> /usr/lib64/dovecot
/libdovecot.so.0(io_loop_handler_run_internal+0xbf) [0x7f9b510e0dcf] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x55) [0x7f9b510defb5] -> /usr/lib64/dovecot
/libdovecot.so.0(io_loop_run+0x38) [0x7f9b510df1d8] -> /usr/lib64/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f9b5105eab3] -> dovecot/imap(main+0x33e) [0x7f9b51903cee] ->
/lib64/libc.so.6(__libc_start_main+0xfd) [0x7f9b50c8bd1d] -> dovecot/imap(+0xe339) [0x7f9b518e8339]
Jan 18 10:08:20 mail dovecot: imap(bob@tutech.de)<18200><CIPhNwljJcdYS/hg>: Fatal: master: service(imap): child 18200 killed with signal 6 (core dumped)
The gdb backtrace is:
...
gdb /usr/libexec/dovecot/imap /var/core/18200
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...done.
[New Thread 18200]
Reading symbols from /usr/lib64/dovecot/libdovecot-storage.so.0...done.
Loaded symbols for /usr/lib64/dovecot/libdovecot-storage.so.0
Reading symbols from /usr/lib64/dovecot/libdovecot.so.0...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...done.
Loaded symbols for /usr/lib64/dovecot/lib01_acl_plugin.so
Reading symbols from /usr/lib64/dovecot/lib02_imap_acl_plugin.so...done.
Loaded symbols for /usr/lib64/dovecot/lib02_imap_acl_plugin.so
Reading symbols from /usr/lib64/dovecot/lib15_notify_plugin.so...done.
Loaded symbols for /usr/lib64/dovecot/lib15_notify_plugin.so
Reading symbols from /usr/lib64/dovecot/lib20_mail_log_plugin.so...done.
Loaded symbols for /usr/lib64/dovecot/lib20_mail_log_plugin.so
Reading symbols from /usr/lib64/dovecot/lib20_zlib_plugin.so...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...done.
Loaded symbols for /usr/lib64/dovecot/lib30_imap_zlib_plugin.so
Reading symbols from /lib64/libgcc_s.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libgcc_s.so.1
Core was generated by `dovecot/imap'.
Program terminated with signal 6, Aborted.
#0  0x00007f9b50c9f495 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install dovecot23-2.3.0-3.gf.el6.x86_64
My Dovecot configuration is:
---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---
Is this a bug or a misconfiguration? Is it possible to disable the
zlib Plugin? Can Dovecot read the previous compressed e-mails and
will they stay compressed? Thanks for the help!
Kind regards
Thomas

Thomas Robers

Aki Tuomi

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