[Bug 53420] Bug with ProxyErrorOverride / httpd-2.4.x

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=53420

--- Comment #4 from Rainer Jung <ra...@kippdata.de> ---
First steps of analysis for trunk. The problem happens with all MPMs,
especially also with prefork and event.

The hang until timeout happens in ap_discard_request_body called from
mod_proxy_http.c in line 1640:

1629     /* PR 41646: get HEAD right with ProxyErrorOverride */
1630     if (ap_is_HTTP_ERROR(r->status) && dconf->error_override) {
1631     /* clear r->status for override error, otherwise ErrorDocument
1632     * thinks that this is a recursive error, and doesn't find the
1633     * custom error page
1634     */
1635     r->status = HTTP_OK;
1636     /* Discard body, if one is expected */
1637     if (!r->header_only && /* not HEAD request */
1638     (proxy_status != HTTP_NO_CONTENT) && /* not 204 */
1639     (proxy_status != HTTP_NOT_MODIFIED)) { /* not 304 */
1640     ap_discard_request_body(backend->r);
1641     }
1642     proxy_run_detach_backend(r, backend);
1643     return proxy_status;
1644     }

In ap_discard_request_body - which is used here to discard the reponse body
from the origin server - I can see two brigades being read. The first has one
bucket which contains the original error page coming form the origin server
(here 206 bytes), the second brigade only has a EOS bucket. Reading the second
brigade is where it blocks until proxy timeout.

For 2.2 the situation is different: the first brigade read has two buckets, the
first again containing the origin server response body, the second one the EOS.
The brigade with both buckets could be read immediately without waiting for
timeout.

Any ideas what's going one? Hints in which direction to proceed?

Regards,

Rainer

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