(gdb) bt                                                                        
#0  0x00000037156befa7 in ioctl () from /lib/libc.so.6                          
#1  0x00007fc711565122 in drmWaitVBlank (fd=11, vbl=0x7fff19ffbab0)             
    at xf86drm.c:1857                                                           
#2  0x00007fc6ffb74cf3 in LOCK_HARDWARE (intel=0xed3e90) at 
intel_context.c:968 
#3  0x00007fc6ffb84080 in intelTexImage (ctx=0xed3e90, dims=2, 
target=3553,     
    level=0, internalFormat=4, width=1920, height=1200, depth=1, 
border=0,      
    format=32993, type=5121, pixels=0x0, unpack=0xee0388, 
texObj=0x1002af0,     
    texImage=0x1002e30, imageSize=0, compressed=0) at 
intel_tex_image.c:463     
#4  0x00007fc6ffb84e5d in intelTexImage2D (ctx=0xb, target=436189872,           
    level=-1, internalFormat=1, width=32993, height=<value optimized 
out>,      
    border=0, format=32993, type=5121, pixels=0x0, unpack=0xee0388,             
    texObj=0x1002af0, texImage=0x1002e30) at intel_tex_image.c:565              
#5  0x00007fc6ffc13af6 in _mesa_TexImage2D (target=3553, level=0,               
    internalFormat=4, width=1920, height=1200, border=0, format=32993,          
    type=5121, pixels=0x0) at main/teximage.c:2561                              
#6  0x00007fc71133ba01 in __glXDRIbindTexImage (                                
    baseContext=<value optimized out>, buffer=<value optimized out>,            
    glxPixmap=0x10022c0) at glxdri.c:504                                        
#7  0x00007fc71132ebf7 in __glXDisp_BindTexImageEXT (cl=<value optimized 
out>,  
    pc=<value optimized out>) at glxcmds.c:1540                                 
#8  0x00007fc71132dbb2 in __glXDisp_VendorPrivate (cl=0xb6ff78,                 
    pc=0xb68a64 "\231\020\006") at glxcmds.c:2255                               
#9  0x00007fc7113320f2 in __glXDispatch (client=0xbf1420) at 
glxext.c:492       
---Type <return> to continue, or q <return> to quit---                          
#10 0x000000000044e684 in Dispatch () at dispatch.c:448                         
#11 0x0000000000433e2d in main (argc=8, argv=0x7fff19ffbf78,                    
    envp=<value optimized out>) at main.c:415