Bug#790616: exim4: exim crashes when sending email to more then one recipient

[Giacomo Mulas]

Package: exim4
Version: 4.86~RC4-1
Severity: important

Dear Maintainer,

Since 2 updates in sid, exim4 crashes (and fails to deliver) whenever
attempting to send an email to more than one recipient. It does not matter
whether the recipients are all in the To: field, or in CC:, BCC:, in any
case if there is more than one recipient exim crashes with the following
message on the log:

<message ID> local_scan() function crashed with signal 11 - message temporarily rejected (size <actual size>)

I initially blamed alpine (my default mail user agent), but I can 
reproduce the bug here even with sendmail or mailx.

Please let me know how I can obtain more detailed information to help to
track this down: this cripples local handling of email so it is really
annoying for my users and I would like to help as much as I can to resolve
this as quickly as possible.

Bye
Giacomo Mulas

-- Package-specific info:
Exim version 4.86_RC4 #2 built 29-Jun-2015 05:43:19
Copyright (c) University of Cambridge, 1995 - 2015
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 
2015
Berkeley DB: Berkeley DB 5.3.28: (September  9, 2013)
Support for: crypteq iconv() IPv6 PAM Perl Expand_dlfunc GnuTLS 
move_frozen_messages Content_Scanning DKIM Old_Demime DNSSEC PRDR OCSP
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm 
dbmjz dbmnz dnsdb dsearch ldap ldapdn ldapm mysql nis nis0 passwd pgsql 
sqlite
Authenticators: cram_md5 cyrus_sasl dovecot plaintext spa tls
Routers: accept dnslookup ipliteral iplookup manualroute queryprogram 
redirect
Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp
Fixed never_users: 0
Size of off_t: 8
Configuration file is /var/lib/exim4/config.autogenerated
# /etc/exim4/update-exim4.conf.conf
#
# Edit this file and /etc/mailname by hand and execute update-exim4.conf
# yourself or use 'dpkg-reconfigure exim4-config'
#
# Please note that this is _not_ a dpkg-conffile and that automatic 
changes
# to this file might happen. The code handling this will honor your local
# changes, so this is usually fine, but will break local schemes that mess
# around with multiple versions of the file.
#
# update-exim4.conf uses this file to determine variable values to replace
# the DEBCONFsomethingDEBCONF strings in the configuration template files.
#
# Most settings found in here do have corresponding questions in the
# Debconf configuration, but not all of them.
#
# This is a Debian specific file

dc_eximconfig_configtype='smarthost'
dc_other_hostnames='capitanata.oa-cagliari.inaf.it capitanata.ca.astro.it 
localhost'
dc_local_interfaces='127.0.0.1'
dc_readhost='capitanata.oa-cagliari.inaf.it'
dc_relay_domains=''
dc_minimaldns='true'
dc_relay_nets=''
dc_smarthost='mailserver.oa-cagliari.inaf.it'
CFILEMODE='644'
dc_use_split_config='true'
dc_hide_mailname='false'
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool'
mailname:capitanata.oa-cagliari.inaf.it

-- System Information:
Debian Release: stretch/sid
   APT prefers unstable
   APT policy: (401, 'unstable'), (10, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.0.5-jak (SMP w/4 CPU cores)
Locale: LANG=it_IT.utf8, LC_CTYPE=it_IT.utf8 (charmap=UTF-8) (ignored: 
LC_ALL set to it_IT.utf8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages exim4 depends on:
ii  debconf [debconf-2.0]  1.5.56
ii  exim4-base             4.86~RC4-1
ii  exim4-daemon-heavy     4.86~RC4-1

exim4 recommends no packages.

exim4 suggests no packages.

-- debconf information:
   exim4/drec:

-- 
_________________________________________________________________

Giacomo Mulas <gmulas at ca.astro.it>
_________________________________________________________________

OSSERVATORIO ASTRONOMICO DI CAGLIARI
Str. 54, Loc. Poggio dei Pini * 09012 Capoterra (CA)

Tel. (OAC): +39 070 71180 248     Fax : +39 070 71180 222
Tel. (UNICA): +39 070 675 4916
_________________________________________________________________

"When the storms are raging around you, stay right where you are"
                          (Freddy Mercury)
_________________________________________________________________