linux-kernel - Re: [Intel-gfx] [git pull] drm fixes

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Message-ID: <CAKMK7uHTWc0H0m2eBEBCg-WznzwrkzSsjToMpqZzsEkB1M0w+Q@mail.gmail.com>
Date:	Mon, 2 Mar 2015 18:23:25 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Matt Roper <matthew.d.roper@...el.com>,
	Ander Conselvan de Oliveira <conselvan2@...il.com>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>
Subject: Re: [Intel-gfx] [git pull] drm fixes

On Mon, Mar 2, 2015 at 5:53 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Mon, Mar 2, 2015 at 1:04 AM, Daniel Vetter <daniel@...ll.ch> wrote:
>> And can you please attach a bactrace of the WARN in your patch, just to
>> double-check you blow up at the same spot?
>
> So the dmesg I attached had a backtrace for the new WARN_ONCE() (in
> addition to an unrelated(?) one from i915_gem_free_object()).
>
> Or did you mean a backtrace of the oops when things go wrong, when my
> patch is *not* applied? My first email had that with the kref.h
> warning from drm_framebuffer_reference, which is otherwise the same
> thing.

I've mixed things up with the other reporter which was full of the
subsequent oopses. But after I've sorted out why drm-intel-next
doesn't blow up the same way I see the bug now. Still baffled that we
underrun the refcount apparently since the same pile of legacy code +
atomic glue is used for the old modeset ioctl. But obviously something
is different, so still digging.

The gem_free_object backtrace is a completely unrelated issue. Fix for
that is in drm-intel-fixes and on the way to you:

commit 62e537f8d568347bbe4e00d7803a838750cdc618
Author: Rodrigo Vivi <rodrigo.vivi@...el.com>
Date:   Tue Feb 24 13:37:54 2015 -0800

    drm/i915: Fix frontbuffer false positve.

If that one doesn't help please scream ;-)
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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