OK.  I experimented a bit.  First googled for "startup_list_enable()"
and found it was in gnome-session, so installed gnome-session-dbgsym (I
guess installing that one should have been obvious without even using
google).  Which got me this stacktrace:

#0  0xb7895df8 in strcmp () from /lib/tls/i686/cmov/libc.so.6
#1  0x080500a9 in startup_list_enable (sl=0x8059f38, model=0x80819d0, 
    iter=0xbff2e85c) at startup-programs.c:700
#2  0x0804f738 in startup_enabled_toggled (cell_renderer=0x807eaf8, 
    path=0x8283df8 "1", userdata=0x0) at session-properties-capplet.c:83
#3  0xb7a56863 in IA__g_cclosure_marshal_VOID__STRING (closure=0x80e2068, 
    return_value=0x0, n_param_values=2, param_values=0xbff2eafc, 
    invocation_hint=0xbff2e9dc, marshal_data=0x804f6b0)
    at /build/buildd/glib2.0-2.13.4/gobject/gmarshal.c:496
#4  0xb7a48663 in IA__g_closure_invoke (closure=0x80e2068, return_value=0x0, 
    n_param_values=2, param_values=0xbff2eafc, invocation_hint=0xbff2e9dc)
    at /build/buildd/glib2.0-2.13.4/gobject/gclosure.c:490
#5  0xb7a5a5ab in signal_emit_unlocked_R (node=0x80e3638, detail=0, 
    instance=0x807eaf8, emission_return=0x0, instance_and_params=0xbff2eafc)
    at /build/buildd/glib2.0-2.13.4/gobject/gsignal.c:2440
#6  0xb7a5ba23 in IA__g_signal_emit_valist (instance=0x807eaf8, signal_id=181, 
    detail=0, 
    var_args=0xbff2ed40 
"\034\016����\a\bx���\210�����\a\bhD(\bX\020\016\b�^(\b4���D���") at 
/build/buildd/glib2.0-2.13.4/gobject/gsignal.c:2199
#7  0xb7a5bcc9 in IA__g_signal_emit (instance=0x807eaf8, signal_id=181, 
    detail=0) at /build/buildd/glib2.0-2.13.4/gobject/gsignal.c:2243
#8  0xb7ba96c4 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#9  0x0807eaf8 in ?? ()
#10 0x000000b5 in ?? ()

Now, to get those next few frames, I tried:

$ dpkg -S /usr/lib/libgtk-x11-2.0.so.0 
libgtk2.0-0: /usr/lib/libgtk-x11-2.0.so.0

Unfortunately I cannot seem to find a libgtk-2.0*-dbgsym package
currently.  Maybe it's just a bit latent in showing up in the
repositories.

But then there is the first frame in the trace:

#0  0xb7895df8 in strcmp () from /lib/tls/i686/cmov/libc.so.6

So, I:

$ dpkg -S /lib/tls/i686/cmov/libc.so.6
libc6-i686: /lib/tls/i686/cmov/libc.so.6
$ sudo apt-get install libc6-dbgsym
...

But that doesn't seem to help with frame #1:

#0  0xb784ddf8 in strcmp () from /lib/tls/i686/cmov/libc.so.6
#1  0x080500a9 in startup_list_enable (sl=0x8059f38, model=0x80819d0, 
    iter=0xbfd13e3c) at startup-programs.c:700
#2  0x0804f738 in startup_enabled_toggled (cell_renderer=0x807eaf8, 
    path=0x8288318 "1", userdata=0x0) at session-properties-capplet.c:83
#3  0xb7a0e863 in IA__g_cclosure_marshal_VOID__STRING (closure=0x80e2068, 
    return_value=0x0, n_param_values=2, param_values=0xbfd140dc, 
    invocation_hint=0xbfd13fbc, marshal_data=0x804f6b0)
    at /build/buildd/glib2.0-2.13.4/gobject/gmarshal.c:496
#4  0xb7a00663 in IA__g_closure_invoke (closure=0x80e2068, return_value=0x0, 
    n_param_values=2, param_values=0xbfd140dc, invocation_hint=0xbfd13fbc)
    at /build/buildd/glib2.0-2.13.4/gobject/gclosure.c:490
#5  0xb7a125ab in signal_emit_unlocked_R (node=0x80e3638, detail=0, 
    instance=0x807eaf8, emission_return=0x0, instance_and_params=0xbfd140dc)
    at /build/buildd/glib2.0-2.13.4/gobject/gsignal.c:2440
#6  0xb7a13a23 in IA__g_signal_emit_valist (instance=0x807eaf8, signal_id=181, 
    detail=0, 
    var_args=0xbfd14320 
"\034\216����\a\bXCѿ\210r����\a\b0C(\bX\020\016\b8\203(\b\024Dѿ$Dѿ") at 
/build/buildd/glib2.0-2.13.4/gobject/gsignal.c:2199
#7  0xb7a13cc9 in IA__g_signal_emit (instance=0x807eaf8, signal_id=181, 
    detail=0) at /build/buildd/glib2.0-2.13.4/gobject/gsignal.c:2243
#8  0xb7b616c4 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#9  0x0807eaf8 in ?? ()
#10 0x000000b5 in ?? ()
#11 0x00000000 in ?? ()

So that's about all I can give you.

Cheers.

-- 
gnome-session-properties crashed with SIGSEGV in strcmp()
https://bugs.launchpad.net/bugs/121065
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Desktop Bugs, which is a bug contact for gnome-session in ubuntu.

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