2008/10/8 andrey mirtchovski <mirtchovski@gmail.com>

> while looking around for information on the RC strangeness i triggered
> a bug with rio: if the last window on the "hidden" stack disappears
> _while_ the third mouse button menu is opened, then upon attempting to
> unhide the window without releasing the mouse button in between will
> result in a read addr fault in 'wunhide()'
>
> here's a stack trace and error message:
>
> acid: lstk()
> wunhide(h=0x1)+0x30 /sys/src/cmd/rio/rio.c:1099
>        w=0x1768e0
>        i=0x0
> unhide(h=0x6)+0x27 /sys/src/cmd/rio/rio.c:1129
> button3menu()+0x97 /sys/src/cmd/rio/rio.c:686
> mousethread()+0x2c4 /sys/src/cmd/rio/rio.c:589
>        sending=0x0
>        scrolling=0x0
>        moving=0x0
>        winput=0xdaf40
>        xy=0x1f6
>        inside=0x1
>        tmp=0x0
>        w=0xdaf40
>        oin=0x929e0
>        band=0x1
>        r=0xfefefefe
>
> to reproduce:
>
> open a rio window
> run "window -hide 'sleep 10'"
> click the third mouse button (to bring the "New" menu)
> wait 10 seconds (you will know that 10 seconds have passed if you move
> the mouse over the last hidden window and the highlighted text appears
> to be gibberish)
> unhide the last hidden window by releasing the third mouse button
> while pointing at it in the menu
>
> if you simply release the third mouse button and bring the menu up
> again you will see that the window has disappeared. it is only a bug
> when rio isn't given a chance to refresh the third button menu.
>
> cheers: andrey
>
>
Nice. I tried to follow your instructions and ended up in a situation that
my mouse was movable across my screen, but that was also all I could do...:)
(no menus, no a simple resize/move action) ... reboot with ^t^tr...
(btw. can I do sth. else??! -- in linux one can usually kill X with
alt-ctrl-backspace. Is there anything like that? I hope the underlining
system is just working)
(and one more question: if sth. like this happens on a file server -- I have
a single machine running all --, is it safe to reboot it with ^t^tr? --
usually I use 'fshalt -r'...)
Ruda