linux-kernel - Re: i915_gem_retire_requests oops on 2.6.30-rc7

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Date:	Wed, 27 May 2009 10:42:43 -0700
From:	Eric Anholt <eric@...olt.net>
To:	Alex Bennee <kernel-hacker@...nee.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: i915_gem_retire_requests oops on 2.6.30-rc7

On Wed, 2009-05-27 at 08:50 +0100, Alex Bennee wrote:
> 2009/5/26 Eric Anholt <eric@...olt.net>:
> > On Tue, 2009-05-26 at 13:20 +0100, Alex Bennee wrote:
> >> Hi,
> >>
> >> I've just had X crash on me with an attendant oops in the kernel as it did so:
> >
> > That's not an oops, that's a WARN_ON.  The hardware wasn't caught up by
> > the time we gave up when shutting down the harwdare for VT switching.
> > That's bad.  But we don't know how long we should wait, since the GPU
> > may be hung, and waiting forever would be bad.  So we warn that
> > Something Bad may have happened.
> 
> I can restart X afterwards so it can't be that hung. Would you like a
> reg dump next the problem occurs?
> 
> >
> > It's gone with KMS since we never shut down the GPU.
> >
> 
> Although I'm not switching to KMS yet due to the other issues I'm
> seeing (see xorg mails). But with KMS enabled we still see some things
> like:
> 
> [  660.644103] [drm] TMDS-8: set mode  2f
> [  960.272242] INFO: task events/0:9 blocked for more than 120 seconds.
> [  960.272245] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [  960.272248] events/0      D ffff8800b70a58c0     0     9      2
> [  960.272254]  ffff8800b70b5de0 0000000000000046 ffff8800b103dc41
> ffff880001028980
> [  960.272260]  0000000000004000 0000000000010dc0 000000000000ca38
> ffff8800b0d31678
> [  960.272265]  ffff8800b70b5d60 ffff8800b70a58c0 ffffffff80648350
> ffff8800b70a5c48
> [  960.272270] Call Trace:
> [  960.272280]  [<ffffffff804bfce6>] ? thread_return+0x3e/0xaa
> [  960.272285]  [<ffffffff804c0589>] __mutex_lock_slowpath+0xdf/0x129
> [  960.272290]  [<ffffffff804c092d>] mutex_lock+0x23/0x3b
> [  960.272295]  [<ffffffff803cecd3>] i915_gem_retire_work_handler+0x2d/0x6b
> [  960.272301]  [<ffffffff80247666>] worker_thread+0x176/0x20f
> [  960.272306]  [<ffffffff803ceca6>] ? i915_gem_retire_work_handler+0x0/0x6b
> [  960.272311]  [<ffffffff8024b463>] ? autoremove_wake_function+0x0/0x3d
> [  960.272315]  [<ffffffff802474f0>] ? worker_thread+0x0/0x20f
> [  960.272319]  [<ffffffff802474f0>] ? worker_thread+0x0/0x20f
> [  960.272323]  [<ffffffff8024b061>] kthread+0x5b/0x88
> [  960.272329]  [<ffffffff8020c0ba>] child_rip+0xa/0x20
> [  960.272333]  [<ffffffff8024b006>] ? kthread+0x0/0x88
> [  960.272337]  [<ffffffff8020c0b0>] ? child_rip+0x0/0x20
> 
> So are you sure this is a !KMS related thing?

Yes, that looks like something else entirely.

If you have GPU hangs with KMS, please report them at
bugs.freedesktop.org, with intel_gpu_dump output.

-- 
Eric Anholt
eric@...olt.net                         eric.anholt@...el.com



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