Re: Funky "Blue screen" issue while rebooting from X with 2.6.18-git21

["Jesper Juhl" <jesper.juhl@gmail.com>]

On 08/10/06, Pavel Machek <pavel@ucw.cz> wrote:
> Hi!
>
> > >> > I have a strange "problem" with 2.6.18-git21 that I've never had with
> > >> > any previous kernel. If I open up an xterm in X, su to root and
> > >> > 'reboot' (or 'shutdown -r now') I instantly get a blue screen that
> > >> > persists until the box actually reboots.
> > >>
> > >> Pavel, is this a known issue or should Jesper bisect?
> > >
> > >Jesper should show it is kernel problem and not userland race.
> > >
> >
> > Jesper will try to do that ;-)
> >
> >
> > >If userspace does kill -15 -1; kill -9 -1, and X fails to shut down in
> > >time, it is userland problem ('should wait for X to shut down').
> > >
> >
> > Well, I just checked my initscript that is run when going into
> > runlevels 0 & 6, and it does this :
> >
> > (...)
> >
> > # Kill all processes.
> > # INIT is supposed to handle this entirely now, but this didn't always
> > # work correctly without this second pass at killing off the processes.
> > # Since INIT already notified the user that processes were being killed,
> > # we'll avoid echoing this info this time around.
> > if [ ! "$1" = "fast" ]; then # shutdown did not already kill all processes
> >  /sbin/killall5 -15
> >  /bin/sleep 5
> >  /sbin/killall5 -9
> > fi
>
> ...so, if X takes more than five seconds to shut down, you kill it
> with -9, resulting in blue screen. Too bad, and not an kernel problem.
>
> Try inserting something like
>
>         while ps -aux | grep myXserver;
>                 sleep 1;
>         done
>
> alternatively, remove/shorten the sleep and you should experience blue
> screen in 2.6.17.
>

I'll try and test these things and report back in a few days when I've
gathered some data.


> > kernels, but since somewhere in the 2.6.18-rc series I've experienced
> > this "blue screen" problem once in a while and I've also had a problem
> > with the screen going all white when switching from X to a plain tty
> > and back (once it goes white it stays that way permanently until I
> > reboot) - I *never* see those issues when running 2.6.17.x and
> > earlier.
>
> Maybe something got slower in 2.6.18?
>                                                                 Pavel
>
Perhaps...

-- 
Jesper Juhl <jesper.juhl@gmail.com>
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