On Wed, 2010-08-25 at 15:55 +0200, Johannes Berg wrote:
Since 2.6.36-rc kernels (both rc1 and rc2) I've had X lockups where X sits in a loop just using CPU.
The only kernel message I got this time was this one:
[22290.792075] [drm] nouveau 0000:02:00.0: PFIFO_DMA_PUSHER - Ch 2
stracing X just repeats, in a loop,
ioctl(9, 0x40086482, 0x7fff6a873af0) = ? ERESTARTSYS (To be restarted) --- SIGALRM (Alarm clock) @ 0 (0) --- rt_sigreturn(0xe) = -1 EINTR (Interrupted system call)
so apparently that ioctl never returns.
This has never happened on 2.6.35, and I've gone back now. Large screen updates seem to trigger it more likely, but I haven't found a way to really reproduce it. FWIW, I'm running with two screens connected.
This problem persists in -rc3, where I'd hoped the nouveau changes would actually fix it :-( In fact, it seems I was either "lucky" or it was made easier to trigger, this time it already happened during my login.
johannes