linux-kernel - Re: [2.6.33-rc6-git regression] idr fix breaks Xorg

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Message-ID: <20100204070847.GM15124@hexapodia.org>
Date:	Wed, 3 Feb 2010 23:08:47 -0800
From:	Andy Isaacson <adi@...apodia.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.sourceforge.net
Subject: Re: [2.6.33-rc6-git regression] idr fix breaks Xorg

On Thu, Feb 04, 2010 at 12:11:41PM +0900, Tejun Heo wrote:
> On 02/04/2010 10:28 AM, Andy Isaacson wrote:
> > On my Dell Latitude e4300 commit 859ddf0974 ("idr: fix a critical
> > misallocation bug") causes Xorg to segfault with the following
> > backtrace:
> 
> Does the following patch make any difference?
> 
> diff --git a/lib/idr.c b/lib/idr.c
> index ba7d37c..a96c604 100644
> --- a/lib/idr.c
> +++ b/lib/idr.c
> @@ -140,7 +140,8 @@ static int sub_alloc(struct idr *idp, int *starting_id, struct idr_layer **pa)
>  	id = *starting_id;
>   restart:
>  	p = idp->top;
> -	l = p->layer;
> +	l = idp->layers;
> +	pa[l--] = NULL;
>  	while (1) {
>  		/*
>  		 * We run around this while until we reach the leaf node...

Alas, no -- with that patch applied Xorg still segfaults in the same
place.

-andy
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