linux-kernel - RE: [Bug 10732] REGRESSION: 2.6.26-rc2-git4: X server failed start onX61s laptop

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Message-Id: <1211047916.27447.314.camel@koto.keithp.com>
Date:	Sat, 17 May 2008 11:11:56 -0700
From:	Keith Packard <keithp@...thp.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Eric Anholt <eric@...olt.net>
Cc:	keithp@...thp.com, Theodore Tso <tytso@....edu>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	bugme-daemon@...zilla.kernel.org, airlied@...ux.ie,
	"Barnes, Jesse" <jesse.barnes@...el.com>
Subject: RE: [Bug 10732] REGRESSION: 2.6.26-rc2-git4: X server failed start
	onX61s laptop

On Sat, 2008-05-17 at 09:02 -0700, Pallipadi, Venkatesh wrote:

> I am thinking that may be X is depending on mprotect changes somehow and
> failing when
> it cannot change PAT attributes with mprotect call. Keith earlier
> mentioned that X
> will not depend on this. May be something to do with earlier X version.
> Keith?

It looks like we can turn off read/write access, but we can't turn it
back on. So,

        mprotect (map->memory, map->size, PROT_NONE);
        mprotect (map->memory, map->size, PROT_READ|PROT_WRITE);
 
leaves the memory with no access.

Eric saw this last week; I don't know whether he debugged into it
further.

Which repository is commit 1c12c4cf in?

-- 
keith.packard@...el.com

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