Breakpoint 3, nv30_screen_destroy (pscreen=0x80776e0) at nv30/nv30_screen.c:310
310     {
(gdb) n
313        if (!nouveau_drm_screen_unref(&screen->base))
(gdb) p screen->base.device->fd
value has been optimized out
(gdb) c
Continuing.

Breakpoint 2, 0xb7c08b70 in close () from /usr/lib/libc.so.6
(gdb) bt
#0  0xb7c08b70 in close () from /usr/lib/libc.so.6
#1  0xb7ad0902 in dri2DestroyScreen (base=0x805f608) at dri2_glx.c:712
#2  0xb7aa9d59 in FreeScreenConfigs (priv=0x805da10, priv=0x805da10) at glxext.c:208
#3  0xb7aa9de2 in glx_display_free (priv=priv@entry=0x805da10) at glxext.c:231
#4  0xb7aa9f33 in __glXCloseDisplay (dpy=0x804e348, codes=0x805da54) at glxext.c:277
#5  0xb7e663e1 in XCloseDisplay () from /usr/lib/libX11.so.6
#6  0x08048d3b in glxtest() ()
#7  0x08048d85 in main ()
(gdb) up
#1  0xb7ad0902 in dri2DestroyScreen (base=0x805f608) at dri2_glx.c:712
712        close(psc->fd);
(gdb) p psc->fd
$1 = 4
(gdb) c
Continuing.

Breakpoint 3, nv30_screen_destroy (pscreen=0x80776e0) at nv30/nv30_screen.c:310
310     {
(gdb) n
313        if (!nouveau_drm_screen_unref(&screen->base))
(gdb) p screen->base.device->fd
value has been optimized out
(gdb) c
Continuing.
nouveau: kernel rejected pushbuf: Bad file descriptor
nouveau: ch0: krec 0 pushes 1 bufs 1 relocs 0
nouveau: ch0: buf 00000000 00000002 00000004 00000004 00000000
nouveau: ch0: psh 00000000 000000012c 0000000140
nouveau:        0x0008fd6c
nouveau:        0x00000000
nouveau:        0x00000003
nouveau:        0x00020000
nouveau:        0x00000000
^C
Program received signal SIGINT, Interrupt.