nouveau X lockup on 36-rc (regression from 2.6.35)

[Francisco Jerez]

Johannes Berg <johannes at sipsolutions.net> writes:

> 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.
>
That's already fixed in the nouveau kernel tree.

> johannes
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