[Xcb] [PATCH xcb/libxcb] Fatal error message when we close libX11 window application

[robert somerville]

Hi Uri:

here is the message when we hit the close button: ( I can send screen
captures, if you wish  ( how ?) ) :

XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server
"cgy530ws:0.0"
      after 1304786 requests (1300490 known processed) with 0 events
remaining.

> more tttt.cxx

#include <X11/Xlib.h> // Every Xlib program must include this
#include <assert.h>   // I include this to test return values the lazy way
#include <unistd.h>   // So we got the profile for 10 seconds
#include <stdio.h>
#include <stdlib.h>
#include <execinfo.h>

#define NIL (0)       // A name for the void pointer

void printBacktrace() {
  int j, nptrs;
#define SIZE 100
  void *buffer[100];
  char **strings;

  nptrs = backtrace(buffer, SIZE);
  printf("backtrace() returned %d addresses\n", nptrs);

   /* The call backtrace_symbols_fd(buffer, nptrs, STDOUT_FILENO)
       would produce similar output to the following: */

  strings = backtrace_symbols(buffer, nptrs);
  if (strings == NULL) {
    perror("backtrace_symbols");
    exit(EXIT_FAILURE);
  }

  for (j = 0; j < nptrs; j++)
    printf("%s\n", strings[j]);

  free(strings);
}

int myIOXError(Display *disp)
{
  printf("ERROR Received a X IO error on display=%x.\n", disp);
  printBacktrace();
  return True;
}

main() {
  Display *dpy = XOpenDisplay(NIL);
  assert(dpy);

  int blackColor = BlackPixel(dpy, DefaultScreen(dpy));
  int whiteColor = WhitePixel(dpy, DefaultScreen(dpy));

  // Create the window
  Window w = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0,
                                 200, 100, 0, blackColor, blackColor);

  // We want to get MapNotify events
  XSelectInput(dpy, w, StructureNotifyMask);

  // "Map" the window (that is, make it appear on the screen)
  XMapWindow(dpy, w);

  // Create a "Graphics Context"
  GC gc = XCreateGC(dpy, w, 0, NIL);

  // Tell the GC we draw using the white color
  XSetForeground(dpy, gc, whiteColor);

  // register io error handler
//  XSetIOErrorHandler(myIOXError);

  // Wait for the MapNotify event
  for(;;) {
    XEvent e;
    XNextEvent(dpy, &e);
    if (e.type == MapNotify)
      break;
  }

  // Draw the line
  for(;;) {
    XDrawLine(dpy, w, gc, 10, 60, 180, 20);
    // Send the "DrawLine" request to the server
    XFlush(dpy);
  }

  // Wait for 10 seconds
  sleep(10);
}



ldd tttt
        linux-vdso.so.1 =>  (0x00007f7786ae2000)
        libX11.so.6 => /usr/lib64/libX11.so.6 (0x0000003ede200000)
        libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x0000003ee1e00000)
        libm.so.6 => /lib64/libm.so.6 (0x0000003edb600000)
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x0000003ee1600000)
        libc.so.6 => /lib64/libc.so.6 (0x0000003edae00000)
        libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x0000003edda00000)
        libdl.so.2 => /lib64/libdl.so.2 (0x0000003edba00000)
        /lib64/ld-linux-x86-64.so.2 (0x0000003edaa00000)
        libXau.so.6 => /usr/lib64/libXau.so.6 (0x0000003edde00000)

On Tue, May 26, 2015 at 1:54 PM, Uli Schlachter <psychon at znc.in> wrote:

> Hi,
>
> Am 26.05.2015 um 12:02 schrieb robert somerville:
> > Hello All:
> > This is my first post to this group, please forgive any newbie mistakes
> ..
> >
> > We seem to be having this error on our Redhat 6.6 x86-64 system ! Is
> there
> >  a version of XCB out there that will fix this problem ? This error
> occurs
> > also in a third party API and is apparently killing us. It also occurs
> on a
> > test drawing program when we close the window ( I believe we found it
> here,
> > or nearby)
> >
> > Any suggestions how we should go about fixing this ???
> > I believe (off the top of my head) that we are running Redhat
> libxcb-1.9.?
>
> which error message? Which test drawing program? Any more information than
> "there is an error message when we close our application"?
>
> Cheers,
> Uli
> --
> <alanc> I think someone had a Xprint version of glxgears at one point,
>     but benchmarking how many GL pages you can print per second
>     was deemed too silly to merge
>
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