Capturing dovecot core dump and debugging with gdb: ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.

[Ben Johnson]

Hello,

I'm experiencing a segfault, so I've followed the steps at
http://www.dovecot.org/bugreport.html in an effort to capture the
information necessary to submit a bug report.

Full "doveconf -n" output is at the end of this message.

Dovecot does seem to dump a core file, but when I attempt to parse it, I
get this:

# apt install dovecot-dbg lib64stdc++6-4.9-dbg
# gdb /usr/lib/dovecot/deliver
/var/vmail/tmp/core-deliver-6-5000-5000-29125-1473732949
# Generic gdb GNU disclaimers and such here...
Reading symbols from /usr/lib/dovecot/deliver...Reading symbols from
/usr/lib/debug/.build-id/49/c9c607c304a5c853c05a4ccb9e4b995f185ac4.debug...done.
done.

warning: core file may not match specified executable file.
[New LWP 29125]

warning: the debug information found in "/lib64/ld-2.23.so" does not
match "/lib64/ld-linux-x86-64.so.2" (CRC mismatch).

Core was generated by `/usr/lib/dovecot/deliver -d
sa-training at example.com -m Training.HAM -p'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f7712e77418 in __GI_raise (sig=sig at entry=6) at
../sysdeps/unix/sysv/linux/raise.c:54
54      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb)

The obvious question is why the "core file may not match specified
executable file".

What am I doing wrong here?

Any help would be greatly appreciated.

Thanks in advance!

--Ben



# 2.2.22 (fe789d2): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.13 (7b14904)
# OS: Linux 4.4.0-36-generic x86_64 Ubuntu 16.04.1 LTS
auth_mechanisms = plain login
disable_plaintext_auth = no
listen = *,[::]
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_max_userip_connections = 100
mail_plugins = " quota"
mail_privileged_group = vmail
passdb {
  args = /etc/dovecot/dovecot-sql.conf
  driver = sql
}
plugin {
  antispam_backend = pipe
  antispam_debug_target = syslog
  antispam_pipe_program = /bin/bash
  antispam_pipe_program_args = /usr/local/bin/sa-learn-pipe.sh
  antispam_pipe_program_notspam_arg = --ham
  antispam_pipe_program_spam_arg = --spam
  antispam_pipe_tmpdir = /tmp
  antispam_spam_pattern_ignorecase = SPAM;JUNK
  antispam_trash_pattern_ignorecase = trash;Deleted *
  antispam_verbose_debug = 1
  quota = dict:user::file:/var/vmail/%d/%n/.quotausage
  quota_rule2 = Trash:storage=+100M
  quota_rule3 = Junk:ignore
  quota_rule4 = INBOX:storage=+100M
  quota_warning = storage=100%% quota-reached 100 %u %d
  quota_warning2 = storage=95%% quota-warning 95 %u %d
  quota_warning3 = storage=80%% quota-warning 80 %u %d
  quota_warning4 = -storage=100%% quota-below below %u %d
  sieve = /var/vmail/%d/%n/.sieve
  sieve_max_redirects = 25
}
postmaster_address = postmaster at example
protocols = imap pop3
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0600
    user = vmail
  }
  user = root
}
service config {
  unix_listener config {
    group = vmail
    mode = 0600
    user = vmail
  }
}
service imap-login {
  client_limit = 1000
  process_limit = 512
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
}
service quota-below {
  executable = script /usr/local/bin/quota-below.sh
  unix_listener quota-below {
    group = vmail
    mode = 0666
    user = vmail
  }
  user = vmail
}
service quota-reached {
  executable = script /usr/local/bin/quota-reached.sh
  unix_listener quota-reached {
    group = vmail
    mode = 0666
    user = vmail
  }
  user = vmail
}
service quota-warning {
  executable = script /usr/local/bin/quota-warning.sh
  unix_listener quota-warning {
    group = vmail
    mode = 0666
    user = vmail
  }
  user = vmail
}
ssl_cert = </etc/postfix/smtpd.cert
ssl_key = </etc/postfix/smtpd.key
ssl_protocols = !SSLv2 !SSLv3
userdb {
  driver = prefetch
}
userdb {
  args = /etc/dovecot/dovecot-sql.conf
  driver = sql
}
protocol imap {
  mail_plugins = quota imap_quota antispam
}
protocol pop3 {
  mail_plugins = quota
  pop3_uidl_format = %08Xu%08Xv
}
protocol lda {
  mail_plugins = sieve quota
}
protocol lmtp {
  mail_plugins = quota sieve
  postmaster_address = webmaster at localhost
}