linux-kernel - Re: 3.5 regression on i915

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Message-Id: <275ffc$6skdfn@fmsmga002.fm.intel.com>
Date:	Sat, 06 Oct 2012 10:04:00 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Willy Tarreau <w@....eu>
Cc:	Dave Airlie <airlied@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org
Subject: Re: 3.5 regression on i915

On Sat, 6 Oct 2012 10:42:58 +0200, Willy Tarreau <w@....eu> wrote:
> On Sat, Oct 06, 2012 at 09:24:35AM +0100, Chris Wilson wrote:
> > More likely X is segfaulting for another reason altogether. Can you
> > please attach the stacktrace (with symbols!) and see if another
> > bisection is required?
> 
> Yes, here it is.
> 
> (EE) intel(0): Failed to initialize kernel memory manager
> 
> Backtrace:
> 0: X(xf86SigHandler+0x7e) [0x80d8b5e]
> 1: [0xffffe400]
> 2: /usr/lib/xorg/modules/drivers//intel_drv.so(i830_allocator_init+0x332) [0xb73756e2]

Drat, that is:

commit 7bb6fb8dd958ae773ac205282e3c0b56c22e01ed
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Tue Apr 24 08:22:52 2012 +0200

    drm/i915: disallow gem ums init ioctl for kms
    
    This ioctl used in a kms driver is only useful to create massive
    havoc.

Can't see just why -intel crashes, but I presume it is during the
i830_free_memory along that path.

Anyway, looks like that patch needs to be reverted.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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