Peter Poeml:
> It should work just like that. In which line does the
> crash precisely happen?
In my code (see below) it is triggered if I try to set the
apr_table_t and *then* return. When returning *only* there
is no seg fault. Please see the comments in the code. It
must be something trivial...
I recompiled apache with debugging symbols, however, I
failed to track the issue with the debugger gdb since I am
not very familiar with it. Is there an easy way to get more
info about the crash?
> If the innocent looking lines trigger this, I would expect
> that something is hosed already when they are reached,
> something like corruption of the request object by
> something else which is going on "above".
FYI, this is my little module:
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "apr_strings.h"
static int done_once=FALSE;
static int _hook_access_checker(request_rec* r){
if(done_once) return DECLINED;
else{
done_once=TRUE;
// ok:
//return HTTP_MOVED_TEMPORARILY;
// seg fault:
// char* uri=apr_pstrdup(r->pool,"http://localhost/abcdef";);
// apr_table_setn(r->headers_out,"Location",uri);
// seg fault (as well):
char* uri=apr_pstrdup(r->pool,"http://localhost/abcdef";);
apr_table_setn(r->err_headers_out,"Location",uri);
return HTTP_MOVED_TEMPORARILY;
}
}
static void _hooks_register(apr_pool_t *p){
ap_hook_access_checker(
_hook_access_checker,NULL,NULL,APR_HOOK_MIDDLE);
}
module AP_MODULE_DECLARE_DATA mod_hs={
STANDARD20_MODULE_STUFF,
NULL, NULL, NULL, NULL, NULL, _hooks_register
};
> Can you reproduce it easily, i.e. with starting the server
> and issueing a single request?
Yes, exactly. I restart apache, open the browser to
http://localhost and then apache crashs.
/var/log/apache2/error_log:
[Fri Jan 23 11:02:35 2009] [notice] Apache/2.2.10 (Unix)
DAV/2 mod_ssl/2.2.10 OpenSSL/0.9.8j SVN/1.5.4 configured --
resuming normal operations
[Fri Jan 23 11:02:40 2009] [notice] child pid 12364 exit
signal Segmentation fault (11)
[Fri Jan 23 11:04:19 2009] [notice] caught SIGTERM, shutting
down
Hm...
Felix
