Mailinglist Archive: opensuse-bugs (9648 mails)

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https://bugzilla.novell.com/show_bug.cgi?id=339229

           Summary: KDM segfault at login
           Product: openSUSE 10.3
           Version: Final
          Platform: x86-64
        OS/Version: openSUSE 10.3
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: KDE
        AssignedTo: kde-maintainers@xxxxxxx
        ReportedBy: dmair@xxxxxxxxxx
         QAContact: qa@xxxxxxx
          Found By: Customer


Created an attachment (id=182086)
 --> (https://bugzilla.novell.com/attachment.cgi?id=182086)
kdm.log from the problem host

Host system is a Lenovo Thinkpad T60p, Intel Core 2 Duo T7600 2.33GHz, 3GB RAM.
Video is an ATI FireGL 5250 with 256MB of RAM. Drivers are ATI proprietary
fglrx 8.39.4 (problem is reproducible with other versions of the proprietary
driver). I can't remember for certain if it happens with the VESA driver but I
think it does.

When the system boots and the KDM login screen is visible. Attempting to login
immediately results in the graphical console disappearing and the host left at
a text TTY login prompt. The failure happens when I press enter having input
the password. At the failure, the following appears in /var/log/messages:

Nov  5 09:40:56 dmairtp kernel: kdm[4734]: segfault at 00002b3ba78349d0 rip
00002b3ba78349d0 rsp 0000000040ffe748 error 15
Nov  5 09:40:56 dmairtp kdm_greet[3403]: Can't read from core
Nov  5 09:40:56 dmairtp kdm[2917]: Unknown session exit code 0 (sig 11) from
manager process

The rip and rsp values varies each time the failure occurs. The following is
the same event in dmesg:

kdm[4734]: segfault at 00002b3ba78349d0 rip 00002b3ba78349d0 rsp
0000000040ffe748 error 15

If I login as root at the text console and restart xdm and, again, attempt to
login immediately kdm will segfault and I'll be back at the text TTY. However,
if I wait for an indeterminate amount of time or, it appears, if I cycle the
cursor through all the tab stops on the login screen then kdm will not segfault
when I login.

I have been able to reproduce this on three independent installs of 10.3 on the
same host. One was an upgrade from 10.2, the other two were clean installs and
one of those on bare metal.

I attached /var/log/kdm.log. It has a stack walkback for glibc malloc()
detecting a memory corruption. I can't see timestamps in the log and the
address of the corruption, the rip at the point of corruption and the mapping
of modules don't link well (at all) to the segfault report.


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