Bug#929605: courier-imap-ssl: courier-imap-ssl zombies

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Bug#929605: courier-imap-ssl: courier-imap-ssl zombies

Dean Hamstead-2
Package: courier-imap
Version: 4.17.2+0.76.3-5+deb9u1
Severity: normal
File: courier-imap-ssl

Dear Maintainer,

   * What led up to the situation?

I recently upgraded from Jessie (4.15-1.6) to stretch. This was a clean
rebuild on a new VM, with mail data copied over and config changes
cherry-picked over to suit the new version.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

courier-imap-ssl seems to not be reaping processes properly, and zombies are
floating around. I dont have non-ssl imap running exposed to the
internet (its boound to localhost for webmail to use), but in its
limited use it isnt generating zombie processes.

Courier is being monitored by monit, it doesnt have any restarts in its
logs.

   * What was the outcome of this action?

Zombies.

   * What outcome did you expect instead?

No Zombies.



-- System Information:
Debian Release: 9.9
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-0.bpo.4-cloud-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages courier-imap depends on:
ii  courier-authlib                            0.66.4-9
ii  courier-base                               0.76.3-5+deb9u1
ii  debconf [debconf-2.0]                      1.5.61
ii  exim4-daemon-heavy [mail-transport-agent]  4.92-2~bpo9+1
ii  init-system-helpers                        1.48
ii  libc6                                      2.24-11+deb9u4
ii  libcourier-unicode1                        1.4-3+b1
ii  libgamin0 [libfam0]                        0.1.10-5+b1
ii  libgdbm3                                   1.8.3-14
ii  libidn11                                   1.33-1
ii  sysvinit-utils                             2.88dsf-59.9

courier-imap recommends no packages.

Versions of packages courier-imap suggests:
pn  courier-doc           <none>
ii  mutt [imap-client]    1.7.2-1+deb9u1
ii  s-nail [imap-client]  14.8.16-1

-- Configuration Files:
/etc/courier/imapd-ssl changed:
SSLPORT=993
SSLADDRESS=0
SSLPIDFILE=/run/courier/imapd-ssl.pid
SSLLOGGEROPTS="-name=imapd-ssl"
IMAPDSSLSTART=YES
IMAPDSTARTTLS=YES
IMAP_TLS_REQUIRED=0
COURIERTLS=/usr/bin/couriertls
TLS_CERTFILE=/etc/courier/imapd.pem
TLS_DHPARAMS=/etc/courier/dhparams.pem
TLS_TRUSTCERTS=/etc/ssl/certs
TLS_VERIFYPEER=NONE
TLS_CACHEFILE=/var/lib/courier/couriersslcache
TLS_CACHESIZE=524288
MAILDIRPATH=Maildir

/etc/courier/imapd changed:
ADDRESS=::1
PORT=143
MAXDAEMONS=40
MAXPERIP=20
PIDFILE=/run/courier/imapd.pid
TCPDOPTS="-nodnslookup -noidentlookup"
IMAPACCESSFILE=/etc/courier/imapaccess
LOGGEROPTS="-name=imapd"
IMAP_CAPABILITY="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE"
IMAP_KEYWORDS=1
IMAP_ACL=1
IMAP_CAPABILITY_ORIG="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA AUTH=CRAM-MD5 AUTH=CRAM-SHA1 AUTH=CRAM-SHA256 IDLE"
IMAP_PROXY=0
IMAP_PROXY_FOREIGN=0
IMAP_IDLE_TIMEOUT=60
IMAP_MAILBOX_SANITY_CHECK=1
IMAP_CAPABILITY_TLS="$IMAP_CAPABILITY AUTH=PLAIN"
IMAP_CAPABILITY_TLS_ORIG="$IMAP_CAPABILITY_ORIG AUTH=PLAIN"
IMAP_DISABLETHREADSORT=0
IMAP_CHECK_ALL_FOLDERS=0
IMAP_OBSOLETE_CLIENT=0
IMAP_UMASK=022
IMAP_ULIMITD=131072
IMAP_USELOCKS=1
IMAP_SHAREDINDEXFILE=/etc/courier/shared/index
IMAP_ENHANCEDIDLE=0
IMAP_TRASHFOLDERNAME=Trash
IMAP_EMPTYTRASH=Trash:7
IMAP_MOVE_EXPUNGE_TO_TRASH=0
SENDMAIL=/usr/sbin/sendmail
HEADERFROM=X-IMAP-Sender
IMAPDSTART=YES
MAILDIRPATH=Maildir


-- no debconf information