From: "H. Peter Anvin" <hpa@zytor.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>,
Jan Beulich <jbeulich@suse.com>,
Matt Fleming <matt.fleming@intel.com>,
David Howells <dhowells@redhat.com>,
Grant Likely <grant.likely@secretlab.ca>,
Guennadi Liakhovetski <g.liakhovetski@gmx.de>,
Arnd Bergmann <arnd@arndb.de>, Dave Jones <davej@redhat.com>,
Ingo Molnar <mingo@elte.hu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Michael Kerrisk <mtk.manpages@gmail.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [GIT PULL] x86/uapi for 3.8
Date: Sat, 15 Dec 2012 11:41:03 -0800 [thread overview]
Message-ID: <50CCD24F.9090603@zytor.com> (raw)
In-Reply-To: <CA+55aFz3iLPT3wzbU_Nhh4ft1eNQcd4WdQXsgXnKBs6vG9a_Uw@mail.gmail.com>
On 12/15/2012 10:35 AM, Linus Torvalds wrote:
> On Sat, Dec 15, 2012 at 8:33 AM, Markus Trippelsdorf
> <markus@trippelsdorf.de> wrote:
>> On 2012.12.14 at 17:47 -0800, Linus Torvalds wrote:
>>>
>>> Ho humm. Anybody else see anything strange?
>>
>> Yes. I'm seeing a BUG early during boot on my machine (RIP=NULL):
>>
>> BUG: unable to handle kernel NULL pointer dereference at (null)
>>
>> This is caused by commit 53b87cf088e2 ("x86, mm: Include the
>> entire kernel memory map in trampoline_pgd")
>
> Hmm. That reverts cleanly, and the result boots fine for me. And the
> commit looks like exactly the kind of thing that could result in
> problems with exactly the right memory layout, so it could explain why
> the bisect failed and some kernels randomly worked for me and others
> didn't.
>
> So this at least looks like a very possible candidate.
>
> Does anybody have an explanation for the problem?
>
> Btw. the machine in question does not have EFI, and is a bog-standard
> PC (DMI string: "P7H57D-V EVO, BIOS 0999 01/19/2010")
>
> Matt? Jan?
>
Matt is on vacation, and I'm partly offline for the weekend, but that
definitely seems suspicious. Do we have a memory map of the affected
machine(s)?
-hpa
next prev parent reply other threads:[~2012-12-15 19:43 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-12 22:11 [GIT PULL] x86/uapi for 3.8 H. Peter Anvin
2012-12-12 23:48 ` David Howells
2012-12-14 18:25 ` Linus Torvalds
2012-12-14 23:45 ` David Howells
2012-12-15 1:16 ` Linus Torvalds
2012-12-15 1:41 ` Linus Torvalds
2012-12-15 1:47 ` Linus Torvalds
2012-12-15 16:33 ` Markus Trippelsdorf
2012-12-15 16:35 ` Markus Trippelsdorf
2012-12-16 12:43 ` Matt Fleming
2012-12-16 13:25 ` Markus Trippelsdorf
2012-12-16 14:54 ` Matt Fleming
2012-12-16 20:12 ` Linus Torvalds
2012-12-16 22:07 ` Linus Torvalds
2012-12-16 22:25 ` H. Peter Anvin
2012-12-16 22:40 ` Matt Fleming
2012-12-16 22:52 ` Linus Torvalds
2012-12-16 23:49 ` Markus Trippelsdorf
2012-12-15 18:35 ` Linus Torvalds
2012-12-15 19:41 ` H. Peter Anvin [this message]
2012-12-15 19:58 ` Linus Torvalds
2012-12-15 20:06 ` Markus Trippelsdorf
2012-12-15 21:04 ` Markus Trippelsdorf
2012-12-15 21:06 ` Linus Torvalds
2012-12-15 21:36 ` H. Peter Anvin
2012-12-15 22:05 ` Yinghai Lu
2012-12-15 23:37 ` Linus Torvalds
2012-12-15 23:46 ` H. Peter Anvin
2012-12-16 12:46 ` Matt Fleming
2012-12-15 21:37 ` Dave Jones
2012-12-15 23:47 ` H. Peter Anvin
2012-12-17 9:04 ` Jan Beulich
2012-12-17 15:44 ` Linus Torvalds
2012-12-17 16:00 ` Jan Beulich
2012-12-17 16:39 ` H. Peter Anvin
2012-12-17 17:03 ` Jan Beulich
2012-12-17 17:15 ` H. Peter Anvin
2012-12-18 8:02 ` Jan Beulich
2012-12-15 4:25 ` H. Peter Anvin
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