Public bug reported:

Binary package hint: gnome-screensaver

Every once in a while I am unable to unlock the screensaver. Moving my
mouse and pressing keys does not bring up the unlock dialog. I then have
to wait for quite some time (I suspect it is roughly the time that it
would take the dialog to disappear again without user activity) and on
the second try it usually comes up successfully.

When switching to a console,  I can see that gnome-screensaver-dialog is
running even if it's not showing a dialog. Here is a backtrace:

(gdb) bt
#0  0x00e9d422 in __kernel_vsyscall ()
#1  0x05677b86 in poll () from /lib/tls/i686/cmov/libc.so.6
#2  0x006754eb in g_poll () from /lib/libglib-2.0.so.0
#3  0x006680ac in ?? () from /lib/libglib-2.0.so.0
#4  0x00668817 in g_main_loop_run () from /lib/libglib-2.0.so.0
#5  0x0804f17a in gs_lock_plug_run ()
#6  0x0804de3d in ?? ()
#7  0x0804dfee in ?? ()
#8  0x08053293 in ?? ()
#9  0x00662661 in ?? () from /lib/libglib-2.0.so.0
#10 0x006645e5 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#11 0x006682d8 in ?? () from /lib/libglib-2.0.so.0
#12 0x00668817 in g_main_loop_run () from /lib/libglib-2.0.so.0
#13 0x010de3c9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#14 0x08053f8c in gs_auth_verify_user ()
#15 0x0804dbd4 in ?? ()
#16 0x00662661 in ?? () from /lib/libglib-2.0.so.0
#17 0x006645e5 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#18 0x006682d8 in ?? () from /lib/libglib-2.0.so.0
#19 0x00668817 in g_main_loop_run () from /lib/libglib-2.0.so.0
#20 0x010de3c9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#21 0x0804d976 in main ()

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: gnome-screensaver 2.30.0-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-23-generic i686
Architecture: i386
Date: Sun Jul 11 20:38:13 2010
EcryptfsInUse: Yes
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: gnome-screensaver
WindowManager: metacity

** Affects: gnome-screensaver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 lucid

-- 
Unlock dialog hangs
https://bugs.launchpad.net/bugs/604420
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