linux-kernel - Re: [tip:x86/kaslr] x86, relocs: Add more per-cpu gold special cases

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Message-ID: <20131014083035.GA20976@gmail.com>
Date:	Mon, 14 Oct 2013 10:30:35 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	hpa@...or.com, linux-kernel@...r.kernel.org, keescook@...omium.org,
	md@...gle.com, tglx@...utronix.de, hpa@...ux.intel.com
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/kaslr] x86, relocs: Add more per-cpu gold special cases


* tip-bot for Michael Davidson <tipbot@...or.com> wrote:

> Commit-ID:  d751c169e9a6f0f853346f1184881422bd10b3c2
> Gitweb:     http://git.kernel.org/tip/d751c169e9a6f0f853346f1184881422bd10b3c2
> Author:     Michael Davidson <md@...gle.com>
> AuthorDate: Thu, 10 Oct 2013 18:39:54 -0700
> Committer:  H. Peter Anvin <hpa@...ux.intel.com>
> CommitDate: Sun, 13 Oct 2013 03:11:57 -0700
> 
> x86, relocs: Add more per-cpu gold special cases

I'm quite sure that one of the recent x86/kaslr changes causes this early 
x86-64 crash:

 BRK [0x179fb000, 0x179fbfff] PGTABLE
 BRK [0x179fc000, 0x179fcfff] PGTABLE
 BRK [0x179fd000, 0x179fdfff] PGTABLE
 PANIC: early exception 0e rip 10:ffffffff95203b9c error 0 cr2 ffffffff82a04a58
 CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.0-rc5+ #229838
 Hardware name: System manufacturer System Product Name/A8N-E, BIOS ASUS 
 A8N-E ACPI BIOS Revision 1008 08/22/2005
 PANIC: early exception 0e rip 10:ffffffff95203e01 error 0 cr2 ffffffff82a04a58

Config and crashlog attached.

ffffffff95203b9c and ffffffff95203e01 is well outside the executable range 
is thus not in the vmlinux.

ffffffff82a04a58 is:

ffffffff82a03000 t init_per_cpu__gdt_page
ffffffff82bcd000 t _sinittext

Thanks,

	Ingo

View attachment "config" of type "text/plain" (93839 bytes)

View attachment "crash.log" of type "text/plain" (2687 bytes)