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Bug 174279 - Segfault while starting Xorg in AccessUsingXdmcp ()
Segfault while starting Xorg in AccessUsingXdmcp ()
Status: CLOSED DUPLICATE of bug 178986
Product: Fedora
Classification: Fedora
Component: xorg-x11-server (Show other bugs)
x86_64 Linux
medium Severity high
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Assigned To: Mike A. Harris
Depends On:
Blocks: FC5Blocker
  Show dependency treegraph
Reported: 2005-11-27 02:39 EST by Adam Szalkowski
Modified: 2007-11-30 17:11 EST (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2006-02-07 05:15:32 EST
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Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:

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Tracker ID Priority Status Summary Last Updated 5068 None None None Never 5218 None None None Never

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Description Adam Szalkowski 2005-11-27 02:39:47 EST
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):

How reproducible:

Steps to Reproduce:
1. just start Xorg

Additional info:
Comment 1 Adam Szalkowski 2006-01-04 03:12:49 EST
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.

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.

This bug is described in
and a solution is suggested in
Please apply this patch to Xorg.
Comment 2 Mike A. Harris 2006-01-31 19:22:59 EST
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 01:36:11 EST
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 05:15:32 EST

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

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