This seems to be because gnome-screensaver-dialog exits after the 5th
failed attempt, whilst the main gnome-screensaver process is still
shaking the dialog to indicate an auth failure. I've ran it through
xtrace which shows that gnome-screensaver tries to do some X calls on
the gnome-screensaver-dialog window after it was destroyed. I also
rebuilt gnome-screensaver with some extra debug statements which show
that gnome-screensaver-dialog exits whilst the dialog is being shaken.
This happens every time, but it just seems to be that you need to be
unlucky with the timing to get it to crash.
Anyway, the current implementation is not robust and is race-prone, so I
will work on fixing that now.
** Changed in: gnome-screensaver (Ubuntu Karmic)
Status: Triaged => In Progress
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Screen lock unlocks after 5 wrong attempts
https://bugs.launchpad.net/bugs/446395
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