[Bugme-new] [Bug 10687] New: pam_unix : segfault in libnss_compat-2.3.6.so with kde 3.5.5a and kdm

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Mon May 12 23:56:01 PDT 2008


http://bugzilla.kernel.org/show_bug.cgi?id=10687

           Summary: pam_unix : segfault in libnss_compat-2.3.6.so with kde
                    3.5.5a and kdm
           Product: Other
           Version: 2.5
     KernelVersion: 2.6.25
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: klibc/kinit
        AssignedTo: other_klibc-kinit at kernel-bugs.osdl.org
        ReportedBy: damien.brucker at cus-strasbourg.net


Latest working kernel version: 2.6.23.17
Earliest failing kernel version: all 2.6.24 and all 2.6.25
Distribution: Debian Etch 4.0 stable
Hardware Environment: Intel Celeron M 1,5 Ghz processor and Intel 915 chipset
Software Environment: KDE 3.5.5.a
Problem Description:

Hello

Using kde-3.5.5a in association with kdm (Debian Etch 4.0 stable release), I
get the following segfault when I enter in a root text console (tty1):

# /etc/init.d/kdm stop

KDE and kdm stop normally as expected, but a segfault appears on the screen.

When I restart kde with:

# /etc/init.d/kdm start

There's no segfault at all, and the KDE desktop starts normally.

This bug is reproductible each time I enter # /etc/init.d/kdm stop

Here is the log file:

Apr 21 20:59:37 localhost kdm: :0[1985]: (pam_unix) session closed for user
damien
Apr 21 20:59:37 localhost kdm: :0[1985]: PAM unable to dispatch function
Apr 21 20:59:37 localhost kdm: :0[1985]: pam_setcred(DELETE_CRED) for damien
failed: Bad item passed to pam_*_item()
Apr 21 20:59:37 localhost kdm: :0[1985]: PAM unable to dispatch function
Apr 21 20:59:37 localhost kernel: kdm[1985]: segfault at b7d68db0 ip b7d68db0
sp bfffbadc error 4 in libnss_compat-2.3.6.so[b7d7e000+7000]
Apr 21 20:59:37 localhost kdm[1980]: Unknown session exit code 0 (sig 11) from
manager process
Apr 21 20:59:49 localhost kdm: :0[2156]: (pam_unix) session opened for user
damien by (uid=0)

There seems to be a conflict between the kernel pam_unix module and the libc6
library
Important note : this bug appears with all 2.6.24 and 2.6.25 kernels, but not
with the 2.6.23.17 kernel.

Can this bug been resolved within the kernel?

Thanks

Damien BRUCKER


Steps to reproduce: see above


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