linux-kernel - Re: Error: freeing invalid memtype

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Date:	Mon, 23 Mar 2009 12:07:20 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Kevin Winchester <kjwinchester@...il.com>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Dave Airlie <airlied@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Error: freeing invalid memtype

On Sat, Mar 21, 2009 at 04:05:48PM -0700, Kevin Winchester wrote:
> Pallipadi, Venkatesh wrote:
> > Kevin,
> > 
> > Can you please send me the output of
> > # cat /debug/x86/pat_memtype_list
> > 
> > (with debugfs mounted at /debug) as soon as you login into X and also
> > when you start seeing these errors with etracer and glxinfo.
> > 
> 
> Here is the output before attempting to run glxinfo:
> : :
> : :
> 
> Does that help track down the problem?  I am about to try disabling PAT
> in my config to see if that fixes things.
> 

Can you please try the patch below and let me whether it helps.

Thanks,
Venki

x86, PAT: Change vma prot in pci_mmap to reflect inherited prot
    
While looking at the issue in the thread
http://marc.info/?l=dri-devel&m=123606627824556&w=2
noticed a bug in pci PAT code and memory type setting.
    
pci mmap code did not set the proper protection in vma, when it
inherited protection in reserve_memtype. This bug only affects
the case where there exists a WC mapping before X does an mmap
with /proc or /sys pci interface. This will cause X userlevel
mmap from /proc or /sysfs to fail on fork.
    
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 5ead808..f234a37 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -319,6 +319,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 			return -EINVAL;
 		}
 		flags = new_flags;
+		vma->vm_page_prot = __pgprot(
+			(pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK) |
+			flags);
 	}
 
 	if (((vma->vm_pgoff < max_low_pfn_mapped) ||
--
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