You need to use prefork Apache. Processes instead  threads. The WO adapter will 
not work in a multithreaded setup.

Disable http2.

Michael 

Sent from my iPhone

> On Jan 11, 2022, at 4:21 AM, John Pollard via Webobjects-dev 
> <webobjects-dev@lists.apple.com> wrote:
> 
> Hello list,
> 
> I recently moved to Amazon Linux 2 and apache 2.4
> 
> In /etc/httpd/conf.modules.d/00-mpm.conf
> 
> If I opt for prefork, I see this in the error log:
> 
> The mpm module (prefork.c) is not supported by mod_http2. The mpm determines 
> how things are processed in your server. HTTP/2 has more demands in this 
> regard and the currently selected mpm will just not do. This is an advisory 
> warning. Your server will continue to work, but the HTTP/2 protocol will be 
> inactive.
> 
> If I instead opt for the event module
> 
> I intermittently get segmentation faults logged, such as:
> [Tue Jan 11 07:35:36.570934 2022] [core:notice] [pid 2485:tid 
> 139715274359360] AH00052: child pid 3132 exit signal Segmentation fault (11)
> 
> Should I be able to use mpm event and how important is having support for 
> http/2? I believe I have the correct mod_WebObjects.so for apache 2.4, works 
> fine with prefork
> 
> Many thanks,
> John
> 
> 
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