Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751439AbaKGJ0t (ORCPT ); Fri, 7 Nov 2014 04:26:49 -0500 Received: from mga03.intel.com ([134.134.136.65]:46761 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751164AbaKGJ0m (ORCPT ); Fri, 7 Nov 2014 04:26:42 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,330,1413270000"; d="scan'208";a="633193677" Date: Fri, 7 Nov 2014 17:26:51 +0800 From: Yuanhan Liu To: Ard Biesheuvel Cc: LKP , Matt Fleming , Leif Lindholm , LKML Subject: Re: [LKP] [dmi] PANIC: early exception 0e rip 10:ffffffff81899e6b error 9 cr2 ffffffffff240000 Message-ID: <20141107092651.GE24745@yliu-dev.sh.intel.com> References: <20141107054741.GB30507@yliu-dev.sh.intel.com> <20141107073720.GB24745@yliu-dev.sh.intel.com> <20141107081344.GC24745@yliu-dev.sh.intel.com> <20141107084604.GD24745@yliu-dev.sh.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 07, 2014 at 10:03:55AM +0100, Ard Biesheuvel wrote: > On 7 November 2014 09:46, Yuanhan Liu wrote: > > On Fri, Nov 07, 2014 at 09:23:56AM +0100, Ard Biesheuvel wrote: > >> On 7 November 2014 09:13, Yuanhan Liu wrote: > >> > On Fri, Nov 07, 2014 at 08:44:40AM +0100, Ard Biesheuvel wrote: > >> >> On 7 November 2014 08:37, Yuanhan Liu wrote: > >> >> > On Fri, Nov 07, 2014 at 08:17:36AM +0100, Ard Biesheuvel wrote: > >> >> >> On 7 November 2014 06:47, LKP 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] [] dump_stack+0x4e/0x68 > >> >> >> > [ 0.000000] [] early_idt_handler+0x90/0xb7 > >> >> >> > [ 0.000000] [] ? dmi_save_one_device+0x81/0x81 > >> >> >> > [ 0.000000] [] ? dmi_table+0x3f/0x94 > >> >> >> > [ 0.000000] [] ? dmi_table+0x16/0x94 > >> >> >> > [ 0.000000] [] ? dmi_save_one_device+0x81/0x81 > >> >> >> > [ 0.000000] [] ? dmi_save_one_device+0x81/0x81 > >> >> >> > [ 0.000000] [] dmi_walk_early+0x44/0x69 > >> >> >> > [ 0.000000] [] dmi_present+0x180/0x1ff > >> >> >> > [ 0.000000] [] dmi_scan_machine+0x144/0x191 > >> >> >> > [ 0.000000] [] ? loglevel+0x31/0x31 > >> >> >> > [ 0.000000] [] setup_arch+0x490/0xc73 > >> >> >> > [ 0.000000] [] ? printk+0x4d/0x4f > >> >> >> > [ 0.000000] [] start_kernel+0x9c/0x43f > >> >> >> > [ 0.000000] [] ? early_idt_handlers+0x120/0x120 > >> >> >> > [ 0.000000] [] x86_64_start_reservations+0x2a/0x2c > >> >> >> > [ 0.000000] [] 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? > >> >> > > >> >> > >> >> That's not a brand new machine, so I suppose there wouldn't be a > >> >> SMBIOS 3.0 header lurking in there. > >> >> > >> >> Anyway, if you are in a position to try things, could you apply this > >> >> > >> >> --- a/drivers/firmware/dmi_scan.c > >> >> +++ b/drivers/firmware/dmi_scan.c > >> >> @@ -617,7 +617,7 @@ void __init dmi_scan_machine(void) > >> >> memset(buf, 0, 16); > >> >> for (q = p; q < p + 0x10000; q += 16) { > >> >> memcpy_fromio(buf + 16, q, 16); > >> >> - if (!dmi_smbios3_present(buf) || !dmi_present(buf)) { > >> >> + if (!dmi_present(buf)) { > >> >> dmi_available = 1; > >> >> dmi_early_unmap(p, 0x10000); > >> >> goto out; > >> >> > >> >> and try again? > >> > > >> > kernel boots perfectly with this patch applied. > >> > > >> > --yliu > >> > > >> > >> Thank you! Very useful to know > >> > > > > Sigh, I made a silly error, I speicified wrong commit while testing your > > patch. Sorry for that. > > > > And I tested it again, with your former patch, sorry, the panic still > > happens. > > > > --yliu > > > > OK, no worries. > > Could you please try the attached patch? On my ARM system, it produces > something like this > > ====== Decoding _DMI_ header: > 5f 44 4d 49 5f 89 62 02 00 c0 8a fe 0c 00 27 cf > ====== Remapped SMBIOS table 0xfe8ac000 at ffffff800001e000, size 0x262, num 0xc > ====== Processing SMBIOS table entry at ffffff800001e000, type 0x0, length 0x18 > ====== Processing SMBIOS table entry at ffffff800001e043, type 0x1, length 0x1b > ====== Processing SMBIOS table entry at ffffff800001e09d, type 0x2, length 0x11 > ====== Processing SMBIOS table entry at ffffff800001e105, type 0x3, length 0x18 > ====== Processing SMBIOS table entry at ffffff800001e155, type 0x4, length 0x2a > ====== Processing SMBIOS table entry at ffffff800001e19a, type 0x7, length 0x13 > ====== Processing SMBIOS table entry at ffffff800001e1b5, type 0x9, length 0x11 > ====== Processing SMBIOS table entry at ffffff800001e1cf, type 0x10, length 0x17 > ====== Processing SMBIOS table entry at ffffff800001e1e8, type 0x11, length 0x28 > ====== Processing SMBIOS table entry at ffffff800001e22e, type 0x13, length 0x1f > ====== Processing SMBIOS table entry at ffffff800001e24f, type 0x20, length 0xb > ====== Processing SMBIOS table entry at ffffff800001e25c, type 0x7f, length 0x4 > SMBIOS 2.7 present. > DMI: ARM Arm Versatile Express/Arm Versatile Express, BIOS 16:20:46 Oct 28 2014 > > That should help us pinpoint what is going on here. > Here is the output: [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] ====== Decoding _DMI_ header: [ 0.000000] 5f 44 4d 49 5f 48 a3 0b 00 20 60 8f 3e 00 25 00 [ 0.000000] ====== Remapped SMBIOS table 0xffffffff8f602000 at ffffffffff240000, size 0xba3, num 0x3e PANIC: early exception 0e rip 10:ffffffff8167aa1a error 9 cr2 ffffffffff240001 [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.18.0-rc2-00008-g4d3a0be #66 [ 0.000000] 0000000000000ba3 ffffffff81bcfd10 ffffffff818010a4 00000000000003f8 [ 0.000000] 000000000000003e ffffffff81bcfdf8 ffffffff81d801b0 617420534f49424d [ 0.000000] 000000000000001f ffffffffff240000 0000000000000000 ffffffffff240000 [ 0.000000] Call Trace: [ 0.000000] [] dump_stack+0x46/0x58 [ 0.000000] [] early_idt_handler+0x90/0xb7 [ 0.000000] [] ? dmi_format_ids.constprop.9+0x13c/0x13c [ 0.000000] [] ? dmi_table+0x4a/0xf0 [ 0.000000] [] ? printk+0x61/0x63 [ 0.000000] [] ? dmi_format_ids.constprop.9+0x13c/0x13c [ 0.000000] [] ? dmi_format_ids.constprop.9+0x13c/0x13c [ 0.000000] [] dmi_walk_early+0x6b/0x90 [ 0.000000] [] dmi_present+0x1b4/0x23f [ 0.000000] [] dmi_scan_machine+0x1d4/0x23a [ 0.000000] [] ? early_idt_handlers+0x120/0x120 [ 0.000000] [] setup_arch+0x462/0xcc6 [ 0.000000] [] ? early_idt_handlers+0x120/0x120 [ 0.000000] [] ? early_idt_handler+0x47/0xb7 [ 0.000000] [] ? early_idt_handlers+0x120/0x120 [ 0.000000] [] start_kernel+0x97/0x456 [ 0.000000] [] ? early_idt_handlers+0x120/0x120 [ 0.000000] [] ? early_idt_handlers+0x120/0x120 [ 0.000000] [] x86_64_start_reservations+0x2a/0x2c [ 0.000000] [] x86_64_start_kernel+0x13e/0x14d [ 0.000000] RIP 0xba2 --yliu -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/