Is is possible for you to try 
https://github.com/dovecot/core/commit/3c5101ffdd2a8115e03ed7180d53578765dea4c9.patch

Aki

> On 28 February 2019 18:03 Patrik via dovecot <dovecot@dovecot.org> wrote:
> 
> 
> This bug report is similar to this issue:
> https://www.dovecot.org/list/dovecot/2017-May/108116.html 
> (https://www.dovecot.org/list/dovecot/2017-May/108116.html)
> 
> I know it is not enough info, but every kill follows with this info:
> Feb 28 16:57:50 server dovecot[1511]: auth-worker: Fatal: master: 
> service(auth-worker): child 17009 killed with signal 11 (core dumps disabled 
> - https://dovecot.org/bugreport.html#coredumps)
> Feb 28 16:57:50 server kernel: traps: auth[17009] general protection 
> ip:7fd5d3ae9a64 sp:7fff0a781dc0 error:0 in libmariadb.so.3[7fd5d3add000+26000]
> 
> It looks like the error is related to the libmariadb.so, of course I am using 
> integration with auth sql.
> 
> The configuration is like this:
> # 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf
> # Pigeonhole version 0.5.4 ()
> # OS: Linux 4.19.0-2-amd64 x86_64 Debian buster/sid ext4
> # Hostname: p3x-dc.example.com (http://p3x-dc.example.com)
> auth_mechanisms = plain login
> mail_location = maildir:/var/mail/vhosts/%d/%n
> mail_plugins = quota
> mail_privileged_group = mail
> managesieve_notify_capability = mailto
> managesieve_sieve_capability = fileinto reject envelope encoded-character 
> vacation subaddress comparator-i;ascii-numeric relational regex imap4flags 
> copy include variables body enotify environment mailbox date index ihave 
> duplicate mime foreverypart extracttext
> namespace inbox {
> inbox = yes
> location =
> mailbox Drafts {
> auto = subscribe
> special_use = \Drafts
> }
> mailbox Junk {
> auto = subscribe
> autoexpunge = 30 days
> special_use = \Junk
> }
> mailbox Sent {
> auto = subscribe
> special_use = \Sent
> }
> mailbox Trash {
> auto = subscribe
> autoexpunge = 30 days
> special_use = \Trash
> }
> prefix =
> }
> passdb {
> args = /etc/dovecot/dovecot-sql.conf.ext
> driver = sql
> }
> plugin {
> quota = maildir:User quota
> quota_grace = 10%%
> quota_max_mail_size = 100M
> quota_rule = *:storage=1G
> quota_rule2 = Trash:storage=+100M
> sieve = /etc/dovecot/sieve.conf
> }
> protocols = imap lmtp pop3
> service auth-worker {
> user = vmail
> }
> service auth {
> unix_listener /var/spool/postfix/private/auth {
> group = postfix
> mode = 0666
> user = postfix
> }
> unix_listener auth-userdb {
> mode = 0666
> user = vmail
> }
> user = dovecot
> }
> service imap-login {
> inet_listener imap {
> port = 0
> }
> inet_listener imaps {
> port = 993
> ssl = yes
> }
> }
> service lmtp {
> unix_listener /var/spool/postfix/private/dovecot-lmtp {
> group = postfix
> mode = 0600
> user = postfix
> }
> }
> service pop3-login {
> inet_listener pop3 {
> port = 0
> }
> inet_listener pop3s {
> port = 995
> ssl = yes
> }
> }
> service quota-status {
> client_limit = 1
> executable = quota-status -p postfix
> inet_listener {
> port = 12340
> }
> }
> ssl = required
> ssl_ca = </etc/ssl/example.com/ca.cer (http://example.com/ca.cer)
> ssl_cert = </etc/ssl/example.com/fullchain.cer 
> (http://example.com/fullchain.cer)
> ssl_dh = # hidden, use -P to show it
> ssl_key = # hidden, use -P to show it
> userdb {
> args = uid=vmail gid=vmail home=/var/mail/vhosts/%d/%n
> driver = static
> }
> protocol lmtp {
> auth_socket_path = /var/run/dovecot/auth-master
> mail_plugins = quota sieve
> }
> protocol imap {
> mail_plugins = quota imap_quota
> }
> 
> 
> Patrik
> WWW (https://patrikx3.com) | GitHub (https://github.com/patrikx3/) | NPM 
> (https://www.npmjs.com/~patrikx3) | Corifeus (https://corifeus.com) | +36 20 
> 342 8046
> 
>

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