Am 22.12.2016 um 18:38 schrieb Yann Ylavic:
On Thu, Dec 22, 2016 at 3:12 PM, Jim Jagielski <j...@jagunet.com> wrote:
Hmmmm...

I wonder if it's due to:

         /* Step Two: Make the Connection */
-        if (ap_proxy_connect_backend(scheme, backend, worker, r->server)) {
+        if (ap_proxy_check_connection(scheme, backend, r->server, 0,
+                                      PROXY_CHECK_CONN_EMPTY)
+                && ap_proxy_connect_backend(scheme, backend, worker,
+                                            r->server)) {
             ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00896)

Probably, I think it comes from :

Index: modules/proxy/proxy_util.c
===================================================================
--- modules/proxy/proxy_util.c    (revision 1775191)
+++ modules/proxy/proxy_util.c    (working copy)
@@ -2754,10 +2754,11 @@ PROXY_DECLARE(apr_status_t) ap_proxy_check_connect
     }

     if (rv == APR_SUCCESS) {
+        apr_sockaddr_t *local_addr = NULL;
+        apr_socket_addr_get(&local_addr, APR_LOCAL, conn->sock);
         ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, server,
                      "%s: reusing backend connection %pI<>%pI",
-                     scheme, conn->connection->local_addr,
-                     conn->connection->client_addr);
+                     scheme, local_addr, conn->addr);
     }
     else if (conn->sock) {
         /* This clears conn->scpool (and associated data), so backup and
_

because AJP has no conn->connection (conn->sock only).

Konstantin, can you apply a patch?

Yes, that would be good but Konstantin wrote he is using the binary from Apache Lounge so we would probably need some help from Steffen.

I tried on Solaris with 2.4.25, default config plus snippet from Konstantin plus loading of mod_proxy and mod_proxy_ajp and I do not see a crash there. So it seems to be either platform specific or the reproduction scenario is more complex.

Regards,

Rainer

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