Bug#866124: cyrus childs exit after 50000-60000 seconds of activity

[Gianluigi Tiesi]

Source: cyrus-imapd
Version: 2.5.10-3
Severity: serious

Hi, I've already applied the patch I posted in #863520
but I still have problems, I use imaps and imap,
after a while many processes are dying with code 75, and
many (but not all) clients are not able to use anymore the
email until a cyrus restart.

In the log:

Jun 27 09:00:22 biancaneve cyrus/master[19953]: process type:SERVICE name:imaps path:/usr/lib/cyrus/bin/imapd age:626.757s pid:30998 exited, status 75
Jun 27 09:00:22 biancaneve cyrus/master[19953]: process type:SERVICE name:imaps path:/usr/lib/cyrus/bin/imapd age:626.745s pid:30999 exited, status 75
Jun 27 09:00:22 biancaneve cyrus/master[19953]: process type:SERVICE name:imaps path:/usr/lib/cyrus/bin/imapd age:148.294s pid:32671 exited, status 75
Jun 27 09:00:22 biancaneve cyrus/master[19953]: process type:SERVICE name:imaps path:/usr/lib/cyrus/bin/imapd age:147.282s pid:32672 exited, status 75
Jun 27 09:00:22 biancaneve cyrus/master[19953]: process type:SERVICE name:imaps path:/usr/lib/cyrus/bin/imapd age:146.002s pid:32674 exited, status 75
Jun 27 09:00:22 biancaneve cyrus/master[19953]: process type:SERVICE name:lmtpunix path:/usr/lib/cyrus/bin/lmtpd age:68.150s pid:32754 exited, status 75

(also imap)

and before:

Jun 27 09:00:22 biancaneve cyrus/imap[25084]: IDLE: error sending message DONE to idled for mailbox user.XXX Resource temporarily unavailable.

(distro is stretch, don't look at System Information)

Regards

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/8 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)