https://bz.apache.org/bugzilla/show_bug.cgi?id=68527

--- Comment #3 from abernal <[email protected]> ---
Reproduced with a real build and gdb. The crash is confirmed as reported:
strcmp(r->handler, ...) in fixup_dir() dereferences a NULL r->handler. That
happens once mod_rewrite's internal-redirect loop protection
(LimitInternalRecursion, default 10) kicks in on a self-matching RewriteRule --
each internal redirect gets a fresh request_rec, and by the time the loop is
cut off, r->handler is no longer the one set earlier in the chain by
SetHandler. No working FastCGI backend is needed to reproduce: the crash
happens during the fixups phase, before any handler runs.

Fix and a regression test are available as a pull request:
https://github.com/apache/httpd/pull/915

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