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[users@httpd] Apache 2.4.33 with mod_jk 1.2.43 keeps shutting down when no Tomcat worker is available


 we have Apache-2.4.33 as a frontend to a bunch of Tomcats using mod_jk-1.2.43 as load balancer. Since we upgraded to this combination, we observe Apache shutdowns as soon as the last Tomcat worker is down. This has not happened before up until apache-2.4.33+mod_jk-1.2.42.

error-log is pretty non-informative:

[Fri Aug 17 11:39:24.172531 2018] [ldap:info] [pid 2312:tid 139990203332352] AH01318: APR LDAP: Built with OpenLDAP LDAP SDK
[Fri Aug 17 11:39:24.172712 2018] [ldap:info] [pid 2312:tid 139990203332352] AH01319: LDAP: SSL support available
[Fri Aug 17 11:39:24.191526 2018] [mpm_worker:notice] [pid 2312:tid 139990203332352] AH00292: Apache/2.4.33 (Unix) OpenSSL/1.0.2p mod_jk/1.2.43 configured -- resuming normal operations
[Fri Aug 17 11:39:24.191566 2018] [core:notice] [pid 2312:tid 139990203332352] AH00094: Command line: '/opt/cb2/apache2/bin/httpd -D STATUS -f /opt/cb2/apache2/conf/httpd.conf'
[Fri Aug 17 11:39:27.106795 2018] [mpm_worker:notice] [pid 2312:tid 139990203332352] AH00295: caught SIGTERM, shutting down

Is there anything known along this lines?

Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www: http://www.knobisoft.de