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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Alas, I've set fs.suid_dumpable to 2 but the core is not dumped. So far I've checked:</p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- ulimit -c unlimited, done</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- /proc/sys/kernel/core_pattern is set to /var/tmp/core.%p</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- /var/tmp is chmod 1777</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- daemon is not chrooted </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- sysctl -w fs.suid_dumpable=2</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- dir /var/tmp is empty and filesystem has 2GB free</p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">This is the logfile:</p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:22 imap-front4 dovecot: director: doveadm: Host 192.168.1.145 changed down (vhost_count=100 last_updown_change=0)</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: doveadm: Host 192.168.1.145 changed up (vhost_count=100 last_updown_change=1537271662)</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: Panic: file doveadm-connection.c: line 1097 (doveadm_connection_deinit): assertion failed: (conn->to_ring_sync_abort == NULL)</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: Error: Raw backtrace: /usr/local/lib/dovecot/libdovecot.so.0(+0xa15be) [0xb76fa5be] -> /usr/local/lib/dovecot/libdovecot.so.0(+0xa1641) [0xb76fa641] -> /usr/local/lib/dovecot/libdovecot.so.0(i_fatal+0) [0xb768035e] -> dovecot/director() [0x80574f7] -> dovecot/director() [0x8057f03] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x6b) [0xb77133db] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0xfe) [0xb7714e1e] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x46) [0xb7713496] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_run+0x48) [0xb7713658] -> /usr/local/lib/dovecot/libdovecot.so.0(master_service_run+0x2e) [0xb768c45e] -> dovecot/director(main+0x49e) [0x804cf5e] -> /lib/i386-linux-gnu/i686/cmov/libc.so.6(__libc_start_main+0xe6) [0xb7501e46] -> dovecot/director() [0x804d081]</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: Fatal: master: service(director): child 8059 killed with signal 6 (core not dumped)</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: Connecting to 212.183.164.161:9090 (as 212.183.164.164): Initial connection</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: Incoming connection from director 212.183.164.163/in</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.163/in): Host 192.168.1.142 vhost count changed from 100 to 100</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.163/in): Host 192.168.1.143 vhost count changed from 100 to 100</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.163/in): Host 192.168.1.144 vhost count changed from 100 to 100</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.163/in): Host 192.168.1.145 vhost count changed from 100 to 100</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.163/in): Host 192.168.1.216 vhost count changed from 100 to 100</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.163/in): Host 192.168.1.217 vhost count changed from 100 to 100</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.163/in): Host 192.168.1.218 vhost count changed from 100 to 100</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.163/in): Host 192.168.1.219 vhost count changed from 100 to 100</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.161:9090/out): Handshake finished in 0.001 secs (bytes in=61, bytes out=791, 0+0 USERs received, last input 0.000 s ago, last output 0.001 s ago, connected 0.001 s ago, 408 peak output buffer size, 0.000 CPU secs since connected)</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Sep 18 13:54:52 imap-front4 dovecot: director: director(212.183.164.163/in): Handshake finished in 0.006 secs (bytes in=111411, bytes out=56, 2940+0 USERs received, last input 0.000 s ago, last output 0.006 s ago, connected 0.006 s ago, 0 peak output buffer size, 0.004 CPU secs since connected)</p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">I can confirm that I can trigger the issue having one of the backends flapping down/up.</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br />-- </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; font-weight:600; color:#777777;">Simone Lazzaris</span><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; color:#777777;"><br />Responsabile datacenter<br /><br /></span><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; font-weight:600; color:#777777;">Qcom S.p.A.</span><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; color:#777777;"><br />Via Roggia Vignola, 9 | 24047 Treviglio (BG)<br />T +39036347905 | D +3903631970352| M +393938111237<br /></span><a href="mailto:simone.lazzaris@qcom.it"><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; text-decoration: underline; color:#2980b9;">simone.lazzaris@qcom.it</span></a><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; color:#777777;"> | </span><a href="https://www.qcom.it"><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; text-decoration: underline; color:#2980b9;">www.qcom.it</span></a><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; color:#777777;"><br /><br />Qcom Official Pages</span><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; font-weight:600; color:#777777;"> </span><a href="https://www.linkedin.com/company/qcom-spa"><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; font-weight:600; text-decoration: underline; color:#2980b9;">LinkedIn</span></a><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; color:#777777;"> | </span><a href="http://www.facebook.com/qcomspa"><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; font-weight:600; text-decoration: underline; color:#2980b9;">Facebook</span></a><span style=" font-family:'Helvetica,Arial,sans-serif'; font-size:small; color:#777777;"><br /><br /></span><img src="https://www.qcom.it/includes/email-banner.gif" height="60" /> <br /><br /><br /><br /></p></body></html>