blender: radeon_lock.c:65: radeonGetLock: Assertion `drawable != ((void *)0)' fa
iled.


Hardware: Macbook Pro 2.2
OS: Linux Ubuntu 9.10
Blender: 2.5, all revisions
http://blender.org <- v2.5 Alpha 0
http://graphicall.org <- v2.5 SVN builds


Steps to reproduce:
- start blender 2.5 with r300 driver
- open File->User Preferences
blender crashes on a radeonGetLock assert.


Backtrace:
Program received signal SIGABRT, Aborted.
0x00756422 in __kernel_vsyscall ()
(gdb) bt
#0  0x00756422 in __kernel_vsyscall ()
#1  0x00c6f4d1 in *__GI_raise (sig=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#2  0x00c72932 in *__GI_abort () at abort.c:92
#3  0x00c68648 in *__GI___assert_fail (
    assertion=0x41e3c67 "drawable != ((void *)0)", 
    file=0x41e3c59 "radeon_lock.c", line=65, 
    function=0x41e3c7f "radeonGetLock") at assert.c:81
#4  0x0402a7f4 in radeonGetLock () from /usr/lib/dri/r300_dri.so
#5  0x0402a87f in radeon_lock_hardware () from /usr/lib/dri/r300_dri.so
#6  0x040269e3 in radeonSwapBuffers () from /usr/lib/dri/r300_dri.so
#7  0x04000ec0 in ?? () from /usr/lib/dri/r300_dri.so
#8  0x0031b8a8 in ?? () from /usr/lib/libGL.so.1
#9  0x002f8f8f in glXSwapBuffers () from /usr/lib/libGL.so.1
#10 0x092a957a in GHOST_WindowX11::swapBuffers() ()
#11 0x092a16f1 in GHOST_SwapWindowBuffers ()
#12 0x08639530 in wm_window_swap_buffers ()
#13 0x0863ed84 in wm_draw_update ()
#14 0x08638b98 in WM_main ()
#15 0x086369f4 in main ()
(gdb)