Disable:
#HSTS Header
Header always set Strict-Transport-Security: "max-age=63072000; 
includeSubDomains; preload"
=> Still triggering ...


Disable:
#Enable http2 
Protocols h2 http/1.1
# AND
SSLUseStapling          on
SSLStaplingResponderTimeout 5
SSLStaplingReturnResponderErrors off
SSLStaplingCache        shmcb:/var/run/ocsp(128000)
=> Still triggering ...


Disable (in mod and site config):
SSLSessionTickets      off
SSLOpenSSLConfCmd      Options +PrioritizeChaCha
=> Still triggering ...

Disable (in mod and site config):
SSLHonorCipherOrder     on
SSLCipherSuite          
ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:!DSS
SSLOpenSSLConfCmd       Curves X448:X25519:P-256:P-384
SSLOpenSSLConfCmd       DHParameters "/etc/ssl/dhparam.pem"
=> Still triggering ...

This matches my comment #2 config now.
So the flaky part was the one time it worked find on the initial run?

Retrying two more times ...
Yeah base config still triggers the issue ...
So other than first assumed it was either
a) not the config
OR
b) we needed to run multiple tests to enter some bad state (but apache restarts 
in between)

In any of the abvoe cases, @andreas you can use the system to test and builds 
that you have.
Just take a potential pass with a grain of salt and rerun it a few times.

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https://bugs.launchpad.net/bugs/1836329

Title:
  Regression running ssllabs.com/ssltest causes 2 apache process to eat
  up 100% cpu, easy DoS

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