linux-kernel - Re: [Bug #11313] Plugging HDMI causes "unable to handle kernel paging request"

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Message-Id: <200808212034.38792.rjw@sisk.pl>
Date:	Thu, 21 Aug 2008 20:34:37 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Rafał Miłecki <zajec5@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Jack Steiner <steiner@....com>,
	Alan Jenkins <alan-jenkins@...fmail.co.uk>,
	Hugh Dickens <hugh@...itas.com>
Subject: Re: [Bug #11313] Plugging HDMI causes "unable to handle kernel paging request"

On Thursday, 21 of August 2008, Jeremy Fitzhardinge wrote:
> Rafał Miłecki wrote:
> > I added full dmesg 5 minutes after adding grepped:
> > http://bugzilla.kernel.org/attachment.cgi?id=17331
> >   
> 
> OK, I think I see the problem (pasted from bugzilla comment):
> 
> >>>>
> Some notes as I pick through all the evidence so far:
> 
> - the crash is specifically because there are reserved bits set in the pmd
> - the pmd is b02a00043a6001a3 in both cases
> - the vaddr is ffff88013a600000 in the first crash, and
>                ffff81013a6d1c00 in the second
>   corresponding to the same large-page pmd mapping of phys page 0x13a600000
> - this maps to e820 entry
>  BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
> - the corresponding boot-time mapping is
> 
> init_memory_mapping
>  0100000000 - 0140000000 page 2M
> kernel direct mapping tables up to 140000000 @ b000-11000
>                                                ^^^^^^^^^^
> addr 100000000 reusing pgd 201880 0000000000202063
> last_map_addr: 140000000 end: 140000000
> 
> !!! and the memory allocated for this pagetable is:
>   #5 [0000008000 - 000000b000]          PGTABLE ==> [0000008000 - 000000b000]
>   #6 [000000b000 - 000000c000]          PGTABLE ==> [000000b000 - 000000c000]
>                                                      ^^^^^^^^^^^^^^^^^^^^^^^
> 
> IOW, it's mapping using b000-11000, but it has only reserved b000 - c000
> 
> Also, this is right in the middle of the ISA area, which seems risky.
> <<<<
> 
> Bug #11237 shows the same symptom, so I'm pretty confident they're dups now.

I have marked #11313 as a duplicate of #11237.  Please use the latter one from
now on.

Thanks,
Rafael
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