https://bugs.exim.org/show_bug.cgi?id=2274

            Bug ID: 2274
           Summary: exim 4.91: segfault ... error 4 in libc-2.17.so
           Product: Exim
           Version: 4.91
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Content Scanning
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]

Hello,

I've got Exim 4.91 segfaulting on CentOS 7, the case is not reproducible by
hands. It occurs without any noticeable logic.

In exim's maillog we have:

2018-05-07 16:16:30 1fFgwH-0000nJ-4f ** [email protected] F=<[email protected]>
R=spamcheck_director T=spamcheck: Child process of spamcheck transport (running
command "/usr/sbin/exim -oMr spam-scanned -bS") was terminated by signal 11
(Segmentation fault)

In messages we have:

exim[3061]: segfault at 0 ip 00007f9a3620fc8f sp 00007ffc3eb39a18 error 4 in
libc-2.17.so[7f9a3617b000+1b8000]

The exim version:

# exim -bV
Exim version 4.91 #4 built 09-May-2018 15:25:19
Copyright (c) University of Cambridge, 1995 - 2018
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2018
Berkeley DB: Berkeley DB 5.3.21: (May 11, 2012)
Support for: crypteq IPv6 Perl OpenSSL move_frozen_messages Content_Scanning
DKIM DNSSEC Event OCSP PRDR SPF TCP_Fast_Open Experimental_SRS
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz
dbmnz dnsdb
Authenticators: cram_md5 dovecot plaintext spa
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp
Malware: f-protd f-prot6d drweb aveserver fsecure kavdaemon sophie clamd mksd
avast sock cmdline
Fixed never_users: 0
Configure owner: 0:0
Size of off_t: 8
2018-05-09 15:44:04 cwd=/usr/local/directadmin/custombuild 2 args: exim -bV
Configuration file is /etc/exim.conf

Spamcheck transport:

spamcheck:
  driver = pipe
  batch_max = 100
  command = /usr/sbin/exim -oMr spam-scanned -bS
  current_directory = "/tmp"
  group = mail
  home_directory = "/tmp"
  log_output
  message_prefix =
  message_suffix =
  return_fail_output
  no_return_path_add
  transport_filter = /usr/bin/spamc -u
${lookup{$domain}lsearch*{/etc/virtual/domainowners}{$value}}
  use_bsmtp
  user = mail



OS kernel: 3.10.0-693.21.1.el7.x86_64
Perl: natively installed from official repo: perl-5.16.3-292.el7.x86_64


Could you let me know how to trace further the segfult and fix it?

Regards,
Alex.

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