A way to crash xcompmgr
Alexander E. Patrakov
patrakov at ums.usu.ru
Tue Feb 8 00:16:34 PST 2005
I tried to play with SDL apps and noticed that they don't work well with
Composite enabled (usually the result is all-white or all-transparent, that's
definitely a bug in SDL or in apps). To work around that, I tried forcing a
different X11 visual to SDL apps, like this:
SDL_VIDEO_X11_VISUALID=0x32 dosbox
However, this DirectColor visual immediately crashes xcompmgr. TrueColor
visuals (e.g. 0x2a) work. Please fix xcompmgr.
Some information about my system:
It's Debian Unstable with Xorg packages provided by Marc-Christian Petersen.
The AGP video card is a Radeon 9200 (PCI ID 1002:5961), using the open-source
"radeon" driver.
The output of xdpyinfo and gdb:
patrakov at debian:~$ xdpyinfo
name of display: :0.0
version number: 11.0
vendor string: The X.Org Foundation
vendor release number: 60801000
X.Org version: 6.8.1
maximum request size: 16777212 bytes
motion buffer size: 256
bitmap unit, bit order, padding: 32, LSBFirst, 32
image byte order: LSBFirst
number of supported pixmap formats: 7
supported pixmap formats:
depth 1, bits_per_pixel 1, scanline_pad 32
depth 4, bits_per_pixel 8, scanline_pad 32
depth 8, bits_per_pixel 8, scanline_pad 32
depth 15, bits_per_pixel 16, scanline_pad 32
depth 16, bits_per_pixel 16, scanline_pad 32
depth 24, bits_per_pixel 32, scanline_pad 32
depth 32, bits_per_pixel 32, scanline_pad 32
keycode range: minimum 8, maximum 255
focus: window 0x2200007, revert to PointerRoot
number of extensions: 33
BIG-REQUESTS
Composite
DAMAGE
DOUBLE-BUFFER
DPMS
Extended-Visual-Information
FontCache
GLX
LBX
MIT-SCREEN-SAVER
MIT-SHM
MIT-SUNDRY-NONSTANDARD
RANDR
RECORD
RENDER
SECURITY
SGI-GLX
SHAPE
SYNC
TOG-CUP
X-Resource
XC-APPGROUP
XC-MISC
XFIXES
XFree86-Bigfont
XFree86-DGA
XFree86-DRI
XFree86-Misc
XFree86-VidModeExtension
XInputExtension
XKEYBOARD
XTEST
XVideo
default screen number: 0
number of screens: 1
screen #0:
print screen: no
dimensions: 1024x768 pixels (283x212 millimeters)
resolution: 92x92 dots per inch
depths (7): 24, 1, 4, 8, 15, 16, 32
root window id: 0x49
depth of root window: 24 planes
number of colormaps: minimum 1, maximum 1
default colormap: 0x20
default number of colormap cells: 256
preallocated pixels: black 0, white 16777215
options: backing-store NO, save-unders NO
largest cursor: 64x64
current input event mask: 0xfa4031
KeyPressMask EnterWindowMask LeaveWindowMask
KeymapStateMask StructureNotifyMask SubstructureNotifyMask
SubstructureRedirectMask FocusChangeMask PropertyChangeMask
ColormapChangeMask
number of visuals: 17
default visual id: 0x23
visual:
visual id: 0x23
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x24
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x25
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x26
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x27
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x28
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x29
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x2a
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x2b
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x2c
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x2d
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x2e
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x2f
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x30
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x31
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x32
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x47
class: TrueColor
depth: 32 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
patrakov at debian:~$ gdb xcompmgr
GNU gdb 6.3-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-linux"...(no debugging symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".
(gdb) run
Starting program: /usr/X11R6/bin/xcompmgr
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
Program received signal SIGSEGV, Segmentation fault.
0xb7fd52b5 in XRenderCreatePicture () from /usr/lib/libXrender.so.1
(gdb) bt
#0 0xb7fd52b5 in XRenderCreatePicture () from /usr/lib/libXrender.so.1
#1 0x0804b2fd in ?? ()
#2 0x08053008 in ?? ()
#3 0x02c00674 in ?? ()
#4 0x00000000 in ?? ()
#5 0x00000100 in ?? ()
#6 0xbffff8e0 in ?? ()
#7 0x00000000 in ?? ()
#8 0x00000000 in ?? ()
#9 0x00000000 in ?? ()
#10 0x00000000 in ?? ()
#11 0x00000000 in ?? ()
#12 0x000002d2 in ?? ()
#13 0x00000400 in ?? ()
#14 0x0000002e in ?? ()
#15 0x08050a2e in _IO_stdin_used ()
#16 0x00000005 in ?? ()
#17 0x08052524 in ?? ()
#18 0x08053008 in ?? ()
#19 0x02c00670 in ?? ()
#20 0xbffff8e8 in ?? ()
#21 0x0804f5de in ?? ()
#22 0x08053008 in ?? ()
#23 0x08050a2e in _IO_stdin_used ()
---Type <return> to continue, or q <return> to quit---
#24 0x00000400 in ?? ()
#25 0x000002d2 in ?? ()
#26 0x00000000 in ?? ()
#27 0x0805cdc8 in ?? ()
#28 0x00000048 in ?? ()
#29 0x0804f1de in ?? ()
#30 0x08053008 in ?? ()
#31 0x02c00670 in ?? ()
#32 0xbffff908 in ?? ()
#33 0xb7ee0620 in __after_morecore_hook () from /lib/tls/libc.so.6
#34 0xb7edfc60 in ?? () from /lib/tls/libc.so.6
#35 0xb7ee0620 in __after_morecore_hook () from /lib/tls/libc.so.6
#36 0x08079150 in ?? ()
#37 0xbffff918 in ?? ()
#38 0x00000001 in ?? ()
#39 0xb7ee0620 in __after_morecore_hook () from /lib/tls/libc.so.6
#40 0x08079150 in ?? ()
#41 0x08079160 in ?? ()
#42 0x00003517 in ?? ()
#43 0xbffff990 in ?? ()
#44 0xbffff938 in ?? ()
#45 0x0804c4ee in ?? ()
#46 0x08053008 in ?? ()
#47 0x01403157 in ?? ()
---Type <return> to continue, or q <return> to quit---
#48 0x02c0066d in ?? ()
#49 0x00000000 in ?? ()
#50 0xbffff9f0 in ?? ()
#51 0xbffff990 in ?? ()
#52 0xbffffa68 in ?? ()
#53 0x0804d0c3 in ?? ()
#54 0x08053008 in ?? ()
#55 0x02c00667 in ?? ()
#56 0x00000000 in ?? ()
#57 0x00000001 in ?? ()
#58 0xbffff9a0 in ?? ()
#59 0xbffff9a4 in ?? ()
#60 0x00000000 in ?? ()
#61 0x00000000 in ?? ()
#62 0x00000000 in ?? ()
#63 0x00000000 in ?? ()
#64 0x00000001 in ?? ()
#65 0xbffff994 in ?? ()
#66 0x00000000 in ?? ()
#67 0x00000000 in ?? ()
#68 0xb7dba16c in ?? () from /lib/tls/libc.so.6
#69 0xbffff9d0 in ?? ()
#70 0xb7ff1a4c in _dl_unload_cache () from /lib/ld-linux.so.2
Previous frame inner to this frame (corrupt stack?)
(gdb) quit
The program is running. Exit anyway? (y or n) y
--
Alexander E. Patrakov
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