[Bug 57531] 2.4.12 segmentation fault when accessing host on Listen port that doesn't have defined virtual host block

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=57531

--- Comment #3 from Brian Behlendorf <br...@behlendorf.com> ---
I am hitting this too, oddly also with the same specific error, 400 Bad
Gateway, with the default config file thus pulling in
HTTP_BAD_GATEWAY.html.var.  I wonder if it's related to this snippet from:

https://httpd.apache.org/docs/2.4/upgrading.html#misc

"Multi-language error documents from 2.2.x may not work unless they are
adjusted to the new syntax of mod_include's #if expr= element or the
directive SSILegacyExprParser is enabled for the directory containing the
error documents."

Is your "400.html" the same file as the stock HTTP_BAD_GATEWAY.html.var?

I tried to see if there was any particular error in HTTP_BAD_GATEWAY.html.var
relating to the #if expr= syntax and didn't find anything obvious.  Nor could I
reproduce the error with my hand-cobbled HTTP requests designed to trigger 400
responses, but I do get them in production, so realistic traffic can trigger
it.  However, when I change my config to eliminate ONLY the following line from
my extra/httpd-multilang-errordoc.conf:

#ErrorDocument 400 /error/HTTP_BAD_REQUEST.html.var

that stopped all my core dumps, so it strongly suggests either a bug in that
error message's server-parsed HTML (which still shouldn't trigger a core
dump!!) or an error while processing a bad HTTP request that makes setting up
the CGI environment variables fail spectacularly.

Hoping this can get some attention from folks who'd know...

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