I have this extremely simple X client application:
#include <stdio.h>
#include <X11/Xlib.h>
#include <assert.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
Display *xd;
XEvent xevent;
xd = XOpenDisplay(NULL);
assert(xd);
XSync(xd, 0);
XSynchronize(xd, 1);
XSync(xd, 0);
while (1) {
fprintf(stderr, "loop\n");
XSync(xd, 0);
sleep(1);
}
return 0;
}
In some cases, the application crashes with:
X Error of failed request: BadRequest (invalid request code or no such
operation)
Major opcode of failed request: 18 (X_ChangeProperty)
Serial number of failed request: 7
Current serial number in output stream: 9
I guess this must be a libX11 or server problem. Has anyone seen anything
like this? More details follow: The problem usually occurs during startup
of GNOME on the SLED11 platform. In fact, I initially thought it was a bug
in xinit, since xinit also suffered from the problem. The X server is
Xvnc, built on Xorg 1.5.3. I've not yet been able to reproduce the problem
with the :0 console, and we have not seen this on any other Linux
distribution.
I have been able to get a Wireshark dump (this one with xinit as client).
It's available as http://www.cendio.com/~astrand/x.org/xinit-mn.cap. After
several GetInputFocus calls (which are generated by XSync), I get a
huge reply with something like 64 MappingNotify:s and the same amount of
BadRequests for X_ChangeProperty. Quite strange. Anyone ideas?
Rgds,
---
Peter Åstrand ThinLinc Chief Developer
Cendio AB http://www.cendio.com
Wallenbergs gata 4
583 30 Linköping Phone: +46-13-21 46 00
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