linux-kernel - Re: [LKP] [dmi] PANIC: early exception 0e rip 10:ffffffff81899e6b error 9 cr2 ffffffffff240000

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Date:	Fri, 7 Nov 2014 15:37:20 +0800
From:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	LKP <lkp@...org>, Matt Fleming <matt.fleming@...el.com>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [LKP] [dmi] PANIC: early exception 0e rip 10:ffffffff81899e6b
 error 9 cr2 ffffffffff240000

On Fri, Nov 07, 2014 at 08:17:36AM +0100, Ard Biesheuvel wrote:
> On 7 November 2014 06:47, LKP <lkp@...org> wrote:
> > FYI, we noticed the below changes on
> >
> > https://git.linaro.org/people/ard.biesheuvel/linux-arm efi-for-3.19
> > commit aacdce6e880894acb57d71dcb2e3fc61b4ed4e96 ("dmi: add support for SMBIOS 3.0 64-bit entry point")
> >
> >
> > +-----------------------+------------+------------+
> > |                       | 2fa165a26c | aacdce6e88 |
> > +-----------------------+------------+------------+
> > | boot_successes        | 20         | 10         |
> > | early-boot-hang       | 1          |            |
> > | boot_failures         | 0          | 5          |
> > | PANIC:early_exception | 0          | 5          |
> > +-----------------------+------------+------------+
> >
> >
> > [    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000036fffffff] usable
> > [    0.000000] bootconsole [earlyser0] enabled
> > [    0.000000] NX (Execute Disable) protection: active
> > PANIC: early exception 0e rip 10:ffffffff81899e6b error 9 cr2 ffffffffff240000
> > [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.18.0-rc2-gc5221e6 #1
> > [    0.000000]  0000000000000000 ffffffff82203d30 ffffffff819f0a6e 00000000000003f8
> > [    0.000000]  ffffffffff240000 ffffffff82203e18 ffffffff823701b0 ffffffff82511401
> > [    0.000000]  0000000000000000 0000000000000ba3 0000000000000000 ffffffffff240000
> > [    0.000000] Call Trace:
> > [    0.000000]  [<ffffffff819f0a6e>] dump_stack+0x4e/0x68
> > [    0.000000]  [<ffffffff823701b0>] early_idt_handler+0x90/0xb7
> > [    0.000000]  [<ffffffff823c80da>] ? dmi_save_one_device+0x81/0x81
> > [    0.000000]  [<ffffffff81899e6b>] ? dmi_table+0x3f/0x94
> > [    0.000000]  [<ffffffff81899e42>] ? dmi_table+0x16/0x94
> > [    0.000000]  [<ffffffff823c80da>] ? dmi_save_one_device+0x81/0x81
> > [    0.000000]  [<ffffffff823c80da>] ? dmi_save_one_device+0x81/0x81
> > [    0.000000]  [<ffffffff823c7eff>] dmi_walk_early+0x44/0x69
> > [    0.000000]  [<ffffffff823c88a2>] dmi_present+0x180/0x1ff
> > [    0.000000]  [<ffffffff823c8ab3>] dmi_scan_machine+0x144/0x191
> > [    0.000000]  [<ffffffff82370702>] ? loglevel+0x31/0x31
> > [    0.000000]  [<ffffffff82377f52>] setup_arch+0x490/0xc73
> > [    0.000000]  [<ffffffff819eef73>] ? printk+0x4d/0x4f
> > [    0.000000]  [<ffffffff82370b90>] start_kernel+0x9c/0x43f
> > [    0.000000]  [<ffffffff82370120>] ? early_idt_handlers+0x120/0x120
> > [    0.000000]  [<ffffffff823704a2>] x86_64_start_reservations+0x2a/0x2c
> > [    0.000000]  [<ffffffff823705df>] x86_64_start_kernel+0x13b/0x14a
> > [    0.000000] RIP 0x4
> >
> 
> This is most puzzling. Could anyone decode the exception?
> This looks like the non-EFI path through dmi_scan_machine(), which
> calls dmi_present() /after/ calling dmi_smbios3_present(), which
> apparently has not found the _SM3_ header tag. Or could the call stack
> be inaccurate?
> 
> Anyway, it would be good to know the exact type of the platform,

It's a Nehalem-EP machine, wht 16 CPU and 12G memory.

> and
> perhaps we could find out if there is an inadvertent _SM3_ tag
> somewhere in the 0xF0000 - 0xFFFFF range?

Sorry, how?

	--yliu
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