Debian 6 with Sudden GTK application crash @ libGDK

[venkat_330]

Very recently, we migrated from DEBIAN 5(Lenny) to DEBAIN 6(Squeeze). Since, our application is based on GTK 2.0 we thought migrating from GTK app is pretty easy.

So, as a first step we compiled our application and ran some regressions on the system.

Suddenly, we noticed application getting crash @ libgdk-x11-2.0.so.0.2000.1. This leaded system to crash at unexpected state.

core sample info:

Code: Select all

Program terminated with signal 11, Segmentation fault.
#0  0xb708bb0c in ?? () from /usr/lib/libgdk-x11-2.0.so.0
(gdb) bt
#0  0xb708bb0c in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#1  0xb708bbb1 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#2  0xb7091797 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#3  0xb6e87381 in ?? () from /lib/libglib-2.0.so.0
#4  0xb6e89305 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#5  0xb6e8cfe8 in ?? () from /lib/libglib-2.0.so.0
#6  0xb6e8d527 in g_main_loop_run () from /lib/libglib-2.0.so.0
#7  0xb7224e19 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#8  0x0813e25e in main_callback (data=0x0) at src/dispimage.c:59
#9  0xb6eb36cf in ?? () from /lib/libglib-2.0.so.0
#10 0xb7894955 in start_thread (arg=0xb27ffb70) at pthread_create.c:300
#11 0xb6c94e7e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

From the received CORE ,we were not able to conclude what is causing the exact issue.

So, to fix this issue we ran various trials on the system and found that when DEBIAN 5(lenny's) LIBGDK-X11( libgdk-x11-2.0.so.0.1200.11 ** ) and LIBGTK-X11 ( **libgtk-x11-2.0.so.0.1200.11 ) is used, the system does not crash.

However, when we run the system with mention configuration, we notice that XORG memory is increasing gradually and reaches to SWAP in hours of time.

DEBAIN 6 in with SQUEEZE's default repository GTK and GDK (libgdk-x11-2.0.so.0.2000.1):

MEMMORY Info:

Code: Select all

PID  USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
1520 root      19  -1 37504  27m 3676 S    6  5.6   3:11.65 Xorg 
1520 root      19  -1 37504  27m 3676 S    3  5.6   3:12.69 Xorg 
1520 root      19  -1 37504  27m 3676 S    4  5.6   3:15.06 Xorg 
1520 root      19  -1 37504  27m 3676 S    4  5.6   3:16.09 Xorg 

LDD info: http://pastebin.com/s7F7cmSV

DEBAIN 6 with LENNY's default repository GTK and GDK (libgdk-x11-2.0.so.0.1200.11):

MEMMORY Info:

Code: Select all

PID   USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
11354 root      19  -1 39248  29m 3636 S    3  5.9   0:16.99 Xorg
11354 root      19  -1 39380  29m 3636 S    4  5.9   0:17.10 Xorg
11354 root      19  -1 39512  29m 3636 R    4  6.0   0:21.02 Xorg
11354 root      19  -1 39640  29m 3636 S    3  6.0   0:22.68 Xorg

LDD info: http://pastebin.com/gwJhpEQe

Request ,some debugging model to understand and fix the root cause of the issue.

LDD info for LibGDK :

Sample GTK code that we use for TESTING:

Code: Select all

Compiling:  gcc -o dispText dispText.c `pkg-config --libs --cflags gtk+-2.0 --libs --cflags gthread-2.0`

#include <gtk/gtk.h>
#include <string.h>
#include <stdio.h>
#include <pthread.h>

GtkWidget *window;
pthread_t fsmThreadId;
void destroyWidget(int index)
{
    GList *children, *iter;
    children = gtk_container_get_children(GTK_CONTAINER(window));
    for(iter = children; iter != NULL; iter = g_list_next(iter)){
        gtk_container_remove(GTK_CONTAINER(window),GTK_WIDGET(iter->data));
        printf("Deleting Widget\n");
    }
g_list_free(iter);
g_list_free(children); 
}

int dispTextPage(char* tempfileName, int pixBufOperation)
{
    int index;
    GtkWidget *textv;
    GdkWindow *textv_window;
    GdkPixmap *pixmap = NULL;
    GtkTextBuffer* textBuffer=NULL;

    /* Lock thread */
    gdk_threads_enter();
    GdkColor color;

    char tempBuffer[512];
    char newfName[100]={'\0'};
    char ext[4]={'\0'};
    char temp[100]={'\0'};
    int i;
    char fileName[256];
    FILE * fd;  
    int imageFound = 1;
    int lastSeperatorIndex = 0,j = 0;

    memset(fileName,0,sizeof(fileName));
    strcpy(fileName,tempfileName);
    /* Currently destroing the widget here itself */
    /* Since we are using widgets one by one currently */
    destroyWidget(1);

    textv = gtk_text_view_new ();
    gtk_text_view_set_left_margin(GTK_TEXT_VIEW(textv), 28);
    gtk_text_view_set_right_margin(GTK_TEXT_VIEW(textv), 20);
    gtk_text_view_set_pixels_above_lines(GTK_TEXT_VIEW(textv),1);
    gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(textv), GTK_WRAP_CHAR);

    gtk_text_view_set_justification(GTK_TEXT_VIEW(textv), GTK_JUSTIFY_LEFT);
    gtk_text_view_set_editable(GTK_TEXT_VIEW(textv), FALSE);
    gtk_text_view_set_cursor_visible(GTK_TEXT_VIEW(textv), FALSE);

    gtk_container_add(GTK_CONTAINER(window), textv);

    textv_window = gtk_text_view_get_window (GTK_TEXT_VIEW (textv), GTK_TEXT_WINDOW_TEXT);
    gdk_color_parse ("#68604d", &color);
    //Method 1 : XORG VIRTUAL MEMORY grows 
    if(pixBufOperation==0)
    {
        pixmap = gdk_pixmap_create_from_xpm ((GdkDrawable *) textv_window, NULL, &color, fileName);
        gdk_window_set_back_pixmap (textv_window, pixmap, FALSE);
        g_object_unref(pixmap);
    }
    //METHOD 2 : XORG MEMORY GROWS 132KB per minute
    else
    {
        GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file (fileName, NULL);
        gdk_pixbuf_render_pixmap_and_mask (pixbuf, &pixmap, NULL, 0);
        gdk_window_set_back_pixmap (textv_window, pixmap, FALSE);
        g_object_unref (pixbuf);
        g_object_unref (pixmap);
    }

    textBuffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textv));
    gtk_text_buffer_create_tag (textBuffer, "bold", "foreground", "Black", NULL);
    gtk_text_buffer_create_tag (textBuffer, "Redbold", "foreground", "Red",NULL);
    gtk_text_buffer_create_tag (textBuffer, "whiteBold", "foreground", "White",NULL); 
    gtk_text_buffer_create_tag (textBuffer, "fontSize", "font", "saxmono 27.5", NULL);
    gtk_text_buffer_create_tag (textBuffer, "fontweight", "weight", 1000, NULL);
    gtk_widget_show(textv);
    /* Set the min timeout and break the gtk loop to return the control to the caller */
    gtk_widget_show(window);
    /* Unlock thread */
    gdk_threads_leave();
    return index;
}

gpointer main_callback(gpointer data)
{
    gtk_main();
    return 0;
}

void dispInit(int argc, char* argv[])
{
    gtk_init (&argc, &argv);
    g_thread_init(NULL);
    gdk_threads_init();
    gdk_threads_enter();
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_resize((GtkWindow*)window, 800, 600);
    gtk_widget_realize( window );
    gtk_window_set_decorated((GtkWindow*)window, FALSE);
    g_thread_create(main_callback, NULL, FALSE, NULL);
    /* Unlock Thread */
    gdk_threads_leave();

}

void *fsmThread_RunFunction(void *threadid)
{
    sleep(10);
    while (1)
    {
    dispTextPage("/opt/images/NotEnabled.gif",0);
    sleep(1);       
    dispTextPage("/opt/images/Error.gif",0);
    sleep(1);
    }
}


int main (int argc, char **argv)
{
    GError *error = NULL;
    size_t stacksize;
    pthread_attr_t attr;
    long t=1;
    printf("fsmThreadId");

    pthread_attr_init(&attr);
    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
    pthread_attr_getstacksize (&attr, &stacksize);
    stacksize = sizeof(char)*10*1024*1024;

    pthread_attr_setstacksize (&attr, stacksize);

    if( pthread_create(&fsmThreadId, &attr, fsmThread_RunFunction, (void *)t) )
    {
        exit(-1);
    }

    printf("fsmThreadId created");

    dispInit(argc,argv);
    if(pthread_join(fsmThreadId, NULL))
    {
    exit(-1);
    }
}

[ohZeishi]

Lenny and Squeeze are both quite old, Squeeze isn't officially supported since 2014-05-31 (it's in LTS now), so you might have problems finding someone with the same configuration to reproduce your error.

That said, I tried your dispText.c on Jessie (gtk 2.24.25-1, glib 2.42.1-1) and can't reproduce your problems. It compiles (with deprecation warnings) and runs without problems. I left it running with pixBufOperation=0 and pixBufOperation=1 for 10 minutes each and it didn't crash and the memory usage of Xorg didn't increase either.

I suspect that your problems are connected to your usage of multiple threads. Unfortunately that's always a bit problematic in gtk, so I try to limit access to gtk-objects to the main thread in my programs.

Some other observations on dispText.c:

In dispInit, you call gdk_threads_init after gtk_init, but here https://developer.gnome.org/gdk2/2.24/g ... reads-init it says that it's better to do it the other way round. The order in their examples is g_thread_init, then gdk_threads_init, then gdk_threads_enter and finally gtk_init.

I find it a bit strange to have gtk_main not in the main thread. I've never seen it done that way, and have no idea if that's supposed to work. And perhaps you need gdk_threads_enter/gdk_threads_leave around that, too?

Why do you create the thread for fsmThread_RunFunction before running dispInit? It shouldn't be a problem here because of the 10 second sleep in fsmThread_RunFunction, but if dispInit for some reason took longer than that, window wouldn't be initialized when dispTextPage tries to use it.