On May 29, 2005, at 18:59:03, Linus Torvalds wrote:
On Sun, 29 May 2005, Pekka Enberg wrote:
The mouse cursor does not move and the screen does not refresh. The
machine locks up completely for few seconds (actually more like
5-10 s)
and then the system comes back up (after which it can be used
normally).
I cannot even switch virtual consoles. Please note that I can
immediately reproduce the problem again as many times as I want by
doing
the test scenario.
However, I don't understand how wine can block the X server from doing
even cursor updates. It might be a scheduler bug, of course. The
one thing
a bigger pipe buffer does is end up changing scheduling behaviour.
(On the other hand, I would not be surprised if Wine does something
that
makes X pause, like use DGA or whatever and tells X not to update the
screen, including cursors).
If the application captured the mouse/keyboard and did not pass them
on to
X for some period of time, then X would appear to not respond to VT-
switch
requests, because those keys go through the same handler loop
(depending on
the way your X is configured, of course).
I've had incidents where a user forkbomb was able to hang X (and
therefore
the console) while our SCHED_RR rate-limited SSH daemon was running fine
and able to successfully kill the process.
Cheers,
Kyle Moffett
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