KDM doesn't work in XDMCP mode

[Maxim Levitsky]

Binary package hint: kdm

KDM crashes, if I connect to it via XDMCP (I use Xephyr)

It shows the login screen,, then I enter username/password, and then it gets back to
password prompt.

Looking at dmesg, shows (I use 2.6.24-rc6 vanilla kernel, and have no trouble with it)
Although it seems that apport doesn't work:

[ 4900.558350] kdm[8773]: segfault at 00000000 eip b7d04fb3 esp bf931d9c error 4

Trying to gdb the relevant kdm proccess (I used htop to figure it out) shows this:

Program received signal SIGSEGV, Segmentation fault.
0xb7d04fb3 in strlen () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0 0xb7d04fb3 in strlen () from /lib/tls/i686/cmov/libc.so.6
#1 0xb7e21106 in ?? () from /usr/lib/libdbus-1.so.3
#2 0x00000000 in ?? ()
(gdb)

Steps to reproduce:

1) Enable XDMCP by editing

/etc/kde3/kdm/kdmrc:
[Xdmcp]
Enable=true

And in
/etc/kde3/kdm/Xaccess, uncomment:
* #any host can get a login window
* CHOOSER BROADCAST #any indirect host can get a chooser

2) Try to connect to the host via XDMCP
Like Xnest -broadcast :1

System running latest hardy.

[Maxim Levitsky (maximlevitsky)]

Any progress?

[Zoogie (janne-sarkilahti)]

http://<email address hidden>/msg19399.html

There is reason and fix how to solve that bug.

[Maxim Levitsky (maximlevitsky)]

Thanks a lot.
The above patch fixes this bug.
This fix should be included in kubuntu.

[Maxim Levitsky (maximlevitsky)]

What is going on....
This simple fix is still not included

Ubuntu developers, take a look here.

[Launchpad Janitor (janitor)]

This bug was fixed in the package kdebase - 4:3.5.8-2ubuntu18

---------------
kdebase (4:3.5.8-2ubuntu18) hardy; urgency=low

  * Edited debian/patches/70_kdm_consolekit.diff to fix a crash
    when attempting to connect to local kdm via XDMCP (Closes LP: #178242)
    Thanks to Paul Brook for debbuging this, and to Zoogie for reporting this

 -- Maxim Levitsky <email address hidden> Tue, 06 Feb 2008 00:39:44 +0000