Bug 174279

Summary: Segfault while starting Xorg in AccessUsingXdmcp ()
Product: [Fedora] Fedora Reporter: Adam Szalkowski <adam>
Component: xorg-x11-serverAssignee: Mike A. Harris <mharris>
Status: CLOSED DUPLICATE QA Contact:
Severity: high Docs Contact:
Priority: medium    
Version: rawhide   
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Hardware: x86_64   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2006-02-07 10:15:32 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Blocks: 150222    

Description Adam Szalkowski 2005-11-27 07:39:47 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8) Gecko/20051118 Fedora/1.5-0.5.0.rc3 Firefox/1.5

Description of problem:
When starting Xorg I get a segfault. This is even before the config file is read.

Program received signal SIGSEGV, Segmentation fault.
0x000000000054e9d3 in AccessUsingXdmcp ()
(gdb) bt
#0  0x000000000054e9d3 in AccessUsingXdmcp ()
#1  0x000000000054f6d9 in DefineSelf ()
#2  0x00000000005509b2 in CreateWellKnownSockets ()
#3  0x0000000000432dc7 in main ()

Whereas I start the server with "-nolisten tcp", just as system-config-display does it, the server is starting fine.


Version-Release number of selected component (if applicable):
x11-server-Xorg-0.99.3-9.x86_64

How reproducible:
Always

Steps to Reproduce:
1. just start Xorg
  

Additional info:
Comment 1 Adam Szalkowski 2006-01-04 08:12:49 UTC 
I have found the reason for this segfault:

There is an unitialized irda0 network device in my system which has no network
address and therefore Xorg tries to dereference a NULL pointer.

<quote>
This interface does not have an address. DefineSelf in the xorg source code
requires that network interfaces that are valid have a non-null address field.
This leads to a segfault because ConvertAddr attempts to dereference that pointer.
</quote>

This bug is described in https://bugs.freedesktop.org/show_bug.cgi?id=5068
and a solution is suggested in https://bugs.freedesktop.org/show_bug.cgi?id=5218
Please apply this patch to Xorg.
Comment 2 Mike A. Harris 2006-02-01 00:22:59 UTC 
Ah, thanks very much for the report, and upstream bug URLs also!  I believe
we've gotten other bug reports from people with similar hangs but slightly
different systems, which this is likely to resolve as well.

I'll update the report once I've had a chance to snag the patch and update
the packages.

Thanks again!
Comment 4 Mike A. Harris 2006-02-06 06:36:11 UTC 
I've added a patch which should fix this to xorg-x11-server-1.0.1-2

Please update to the new release and update the report with the status
of test results.

Thanks in advance.
Comment 5 Mike A. Harris 2006-02-07 10:15:32 UTC 

*** This bug has been marked as a duplicate of 178986 ***