Libcurl/libxml2 segfault

I have been working on a library for a while now (http://bbing.codeplex.com/) and that you actually want to release (officially). But I hit a few roadblocks. The remaining list of todos I have are:

  1. Make sure that it works
  2. Search for memory leaks
  3. Release

He has the ability to define customized memory managers. Prior to their introduction, I had random segfaults. After their implementation. I still get random segfaults. I hope it's something that I've done, but whenever I get them, they are located in libcurl and libxml2.

When I do #1, I get segfaults. When I do #2, I get segfaults.

The source code is already high it there to see and check.

Test code:

bing_request_t request = NULL;
bing_response_t response;
bing_result_t* results;
int c;
int i;
enum SOURCE_TYPE t;
unsigned int bingID;

bingID = create_bing("Bing app ID goes here!!");

if(request_create_request(BING_SOURCETYPE_WEB, &request))
{
    response = search_sync(bingID, "Bing API", request);
    if(response)
    {
        c = response_get_results(response, NULL);
        results = calloc(c, sizeof(bing_result_t));
        if(results)
        {
            response_get_results(response, results);
            for(i = 0; i < c; i++)
            {
                t = result_get_source_type(results[i]);
            }
            free(results);
        }
        free_response(response);
    }
    free_request(request);
}

free_bing(bingID);

Note: If you need an ID application to test Bing, PM me.

You can run with default handlers (AKA, doing nothing, just compile), or you can try the "follow-up" to the memory managers by adding the "BING_MEM_TRACK" symbol to the project and compilation.

When I use the memory of follow-up, errors generally occur in 'free_dbg_track' to the free call. The stack trace is usually along the lines of '..., curl_do, curl_http, curl_safefree, xml_curl_free, free_dbg_track, __free.

As mentioned in the title, I also got when I try to release the context of the (search.c, search_cleanup) XML parser that has seems-like-a-fix, if the statement that can or should not cause a memory leak (do not know because I keep segfault-ing). For this stack trace is usually "..., xmlFreeParserCtxt, xmlFree, xml_curl_free, free_dbg_track, __free.

Tested only on the device (rebooted a couple of times to free memory).

This post seems to scatter brained and unorganized, but I can't seem to figure in any other way then put excuses from the outset for this. If you have any ideas, need more details (or Bing ID application, although it is free to do and to register [because you are even ready to approach Bing]), etc. Do not hesitate to ask.

Yep, analysis of memory did the trick. He kept complaining about what I thought to be code perfectly well, but something must have been going wrong (somewhere) and it caused the random segfaults and strange behavior.

Tags: BlackBerry Developers

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    bsddb3.DB.DBInvalidArgError: (22, ' Invalid argument - handle Open database: test.dbxml/secondary_configuration "")
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    Thank you.

    sigh Yes, the opening must be serialized and done by a running process. the reason is that she must be atomic in the creation of the environment. It is because the environment is on the disc - these __db files. If several processes creates or retrieves and environment at the same time - kaboom!

    It gets more interesting. If a transaction fails or something rough happens, the environment must be removed and recovered. This means that if you have several processes using the same environment, they need to communicate to eachother when this scenario occurs, all but one have to stop and give up all operations, wait for a single process to recover, and then retry transactions. If you're just messing around don't you worry about this, but if you build a scalable application that should play in your immediate design. If you plan this route I'll spend some time to find a "Manual of application design" which I happenstanced around a while ago. I can also spend some time talking about my app, but if you're not here I will keep 1 million words.

    Your blocking occurs probably the munging eachother operations. When I ran your code else I could invoke blockages sometimes as well so I would not spend too much time to think about it.

    Let me know if you need this info - I have a large library for python that is unfortunately closed in bla IP, but I had intended to write a manual of survival for someone who needs python + xmldb.

    eleddy

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