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On 2010-07-01T21:56:30+00:00 E-tim-w wrote:

Created attachment 36674
gdb trace of xorg-server seg fault

I'm running LXDE on an Arch Linux system and after a recent upgrade, now
xorg-server exits with a segmentation fault whenever I try to run
lxterminal (the terminal application in the LXDE suite). It happens
every time and immediately after invoking the program (before a window
even appears). I haven't been able to reproduce it with any other
application.


I'm attaching a gdb backtrace collected according to these instructions:

http://wiki.x.org/wiki/Development/Documentation/ServerDebugging?highlight=(segmentation)|(fault)

Since it looks like I only get one attachment, see below for an excerpt
from Xorg.0.log with a backtrace. There's also a gdb trace from
lxterminal showing that it exits without a seg fault.


Here's some version info for my system:

lxterminal 0.1.7-1
lxde-common 0.5.0-1

kernel 2.6.34-ARCH


$ X -version

X.Org X Server 1.8.0
Release Date: 2010-04-02
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.34-ARCH i686 
Current Operating System: Linux deimos 2.6.34-ARCH #1 SMP PREEMPT Sat Jun 19 
13:06:16 CEST 2010 i686
Kernel command line: 
root=/dev/disk/by-uuid/97258355-411c-456d-9ff4-d686b0a3408d ro
Build Date: 01 July 2010  10:29:43PM
 
Current version of pixman: 0.18.2


### excerpt from Xorg.0.log:

[  4480.061] 
Backtrace:
[  4480.061] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80df05b]
[  4480.062] 1: /usr/bin/X (0x8048000+0x63da5) [0x80abda5]
[  4480.062] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb788340c]
[  4480.062] 3: /usr/lib/xorg/modules/libfb.so (image_from_pict+0x3b8) 
[0xb72e6a58]
[  4480.062] 4: /usr/lib/xorg/modules/libfb.so (fbComposite+0x121) [0xb72e6c51]
[  4480.062] 5: /usr/bin/X (0x8048000+0xc7053) [0x810f053]
[  4480.062] 6: /usr/bin/X (CompositePicture+0x290) [0x8103710]
[  4480.062] 7: /usr/bin/X (0x8048000+0x12f0a2) [0x81770a2]
[  4480.062] 8: /usr/bin/X (0x8048000+0x12eea8) [0x8176ea8]
[  4480.063] 9: /usr/bin/X (0x8048000+0x12eea8) [0x8176ea8]
[  4480.063] 10: /usr/bin/X (0x8048000+0x9885f) [0x80e085f]
[  4480.063] 11: /usr/bin/X (BlockHandler+0x58) [0x80921f8]
[  4480.063] 12: /usr/bin/X (WaitForSomething+0x10c) [0x80a7fec]
[  4480.063] 13: /usr/bin/X (0x8048000+0x214d0) [0x80694d0]
[  4480.063] 14: /usr/bin/X (0x8048000+0x1a4b5) [0x80624b5]
[  4480.063] 15: /lib/libc.so.6 (__libc_start_main+0xe6) [0xb75c5c76]
[  4480.064] 16: /usr/bin/X (0x8048000+0x1a0a1) [0x80620a1]
[  4480.064] Segmentation fault at address 0x20
[  4480.064] 
Fatal server error:
[  4480.064] Caught signal 11 (Segmentation fault). Server aborting
[  4480.064] 


### gdb launch of lxterminal:

Reading symbols from /usr/bin/lxterminal...done.
(gdb) run
Starting program: /usr/bin/lxterminal 
[Thread debugging using libthread_db enabled]
[New Thread 0xb58c0b70 (LWP 23639)]
[Thread 0xb58c0b70 (LWP 23639) exited]

Program exited with code 01.
(gdb)

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/705078/comments/0

------------------------------------------------------------------------
On 2010-07-04T11:06:21+00:00 E-tim-w wrote:

Created attachment 36745
gdb trace with debug symbols for libpixman

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/705078/comments/1

------------------------------------------------------------------------
On 2010-07-04T11:09:17+00:00 E-tim-w wrote:

Created attachment 36746
gdb stack trace with code context for the calls

gdb short stack trace with the full function source code (w/line
numbers) for each routine in the trace

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/705078/comments/2

------------------------------------------------------------------------
On 2010-07-06T08:54:51+00:00 Soren-sandmann wrote:

Apparently, the server calls set_has_client_clip() with a NULL image:

   #0  0xb75cb7bc in pixman_image_set_has_client_clip (image=0x0, 
client_clip=1) at pixman-image.c:530
   No locals.

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/705078/comments/3

------------------------------------------------------------------------
On 2018-12-13T22:23:55+00:00 Gitlab-migration wrote:

-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has
been closed from further activity.

You can subscribe and participate further through the new bug through
this link to our GitLab instance:
https://gitlab.freedesktop.org/xorg/xserver/issues/402.

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/705078/comments/44


** Changed in: xserver-xorg-video-intel
       Status: Confirmed => Unknown

-- 
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https://bugs.launchpad.net/bugs/705078

Title:
  Xorg crashed with SIGSEGV in pixman_image_set_has_client_clip()

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