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From: Justin Kennedy <justin@justinkennedy.ca>
Date: Thu, 10 Mar 2016 16:59:51 -0400
Message-ID: 
 <CADZp8L5xsOEP3Hg+Y70UZOqpW7sTbNdmH3syhRXfQh0AbX3WDw@mail.gmail.com>
Subject: "hello world" module crashes 2.4 on CentOS 6.7
To: modules-dev@httpd.apache.org
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Good day,

I have a pretty simple module that is crashing my server as soon as I
dereference a pointer that comes from the request_rec pool.

This is on CentOS 6.7, with Apache 2.4 compiled. It's a fresh VM on AWS.
The module was compiled with apxs. The code is listed below. The output I
get in the log files is:

[Date...] [:error] [client ....] [pid ...] ***--- not nulll

[Date...] [core:notice] [pid ...] AH00052: child pid 1365 exit signal
Segmentation fault (11)

//////////// CODE ////////////////
#include <stdio.h>

#include <http_request.h>
#include <httpd.h>
#include <http_core.h>
#include <http_log.h>
#include <http_config.h>
#include <http_protocol.h>
#include <apr_hooks.h>
#include <ap_config.h>

#define EXAMPLE_NAME "mod_example"

static int example_handler(request_rec *r)
{
  const char *url;

  url = apr_psprintf(r->pool, "%s", "test");

  if(url == NULL) {
    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "***--- null");
  } else {
    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "***--- not nulll");
    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "***--- url is: %s", url);
  }
  ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "***--- done ");

  return DECLINED;
}

static void example_register_hooks(apr_pool_t *pool)
{
    ap_hook_handler(example_handler, NULL, NULL, APR_HOOK_LAST);
}

module AP_MODULE_DECLARE_DATA example_module = {
    STANDARD20_MODULE_STUFF,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    example_register_hooks
};

Any help is appreciated.

-Justin

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