Bug#524558: Occasional X hangs where drmCommandWrite() never returns

[Sami Liedes <sliedes@cc.hut.fi>]

On Sat, Apr 18, 2009 at 02:38:10PM +0200, Julien Cristau wrote:
> On Sat, 2009-04-18 at 03:59 +0300, Sami Liedes wrote:
> > I saw this sometimes on KDE 3, now it happens many times a day on KDE
> > 4 from unstable, so I spent some time figuring out what actually
> > happens (backtrace attached). I think I've also seen it both on an
> > Intel graphics card and a Radeon (with the libre driver), although
> > lately I've only been using the Intel card, and this backtrace is from
> > that setup.
> 
> that sounds like a gpu lockup, not a libdrm bug.

You mean a hardware bug? The huge value of the size parameter is
normal?

I've seen this on at least two different computers, if that matters.
The ioctl() returns, btw, but the calling function calls it again and
again.

	Sami