[Dovecot] dovecot-1.0_beta9 : (auth) killed with signal 11

[Paul Harrington]

I have just upgraded from courier to dovecot and things seem to be working okay
(after a few problems getting shared folders working correctly).

I notice the following error message in my logs:-

Jun 23 11:17:32 calzone dovecot: child 1258 (auth) killed with signal 11

I am using the beta9 ebuild that is available from gentoo portage.  I
have followed
the steps to try to get a core dump but it doesn't seem to be working.

My config file is as follows:-

===============================================================
protocols = imap imaps

protocol imap {
  listen = 127.0.0.1:143
  ssl_listen = *:993
}

mail_drop_priv_before_exec = yes
auth_debug = yes
#mail_debug = yes

default_mail_env = maildir:/var/spool/mail/virtual/users/%u

auth default {
  mechanisms = plain digest-md5 cram-md5

  userdb passwd-file {
    args = /etc/imap.passwd
  }
  passdb passwd-file {
    args = /etc/imap.passwd
  }
}
namespace private {
  separator = .
  prefix = Inbox.
  inbox = yes
}

namespace public {
  separator = .
  prefix = Allstar.
  location = maildir:/var/spool/mail/virtual/users/shared::CONTROL=/var/spool/mail/virtual/control/%u:INDEX=/var/spool/mail/virtual/control/%u
}
==================================================================

All users use UID/GID 5000.

/etc/imap.passwd contains enteries such as:-

  paul:rMPY999gvr2kU:5000:5000::/var/spool/mail/virtual/users/paul

Any advise on how I can produce a core dump and get this fixed?

Thanks

Paul