On Fri, Nov 07, 2014 at 10:03:55AM +0100, Ard Biesheuvel wrote:
> On 7 November 2014 09:46, Yuanhan Liu <yuanhan....@linux.intel.com> wrote:
> > On Fri, Nov 07, 2014 at 09:23:56AM +0100, Ard Biesheuvel wrote:
> >> On 7 November 2014 09:13, Yuanhan Liu <yuanhan....@linux.intel.com> wrote:
> >> > On Fri, Nov 07, 2014 at 08:44:40AM +0100, Ard Biesheuvel wrote:
> >> >> On 7 November 2014 08:37, Yuanhan Liu <yuanhan....@linux.intel.com>
> >> >> wrote:
> >> >> > On Fri, Nov 07, 2014 at 08:17:36AM +0100, Ard Biesheuvel wrote:
> >> >> >> On 7 November 2014 06:47, LKP <l...@01.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?
> >> >> >
> >> >>
> >> >> 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] [<ffffffff818010a4>] dump_stack+0x46/0x58
[ 0.000000] [<ffffffff81d801b0>] early_idt_handler+0x90/0xb7
[ 0.000000] [<ffffffff81dd4cfc>] ? dmi_format_ids.constprop.9+0x13c/0x13c
[ 0.000000] [<ffffffff8167aa1a>] ? dmi_table+0x4a/0xf0
[ 0.000000] [<ffffffff817fa71b>] ? printk+0x61/0x63
[ 0.000000] [<ffffffff81dd4cfc>] ? dmi_format_ids.constprop.9+0x13c/0x13c
[ 0.000000] [<ffffffff81dd4cfc>] ? dmi_format_ids.constprop.9+0x13c/0x13c
[ 0.000000] [<ffffffff81dd49dc>] dmi_walk_early+0x6b/0x90
[ 0.000000] [<ffffffff81dd52fc>] dmi_present+0x1b4/0x23f
[ 0.000000] [<ffffffff81dd55ab>] dmi_scan_machine+0x1d4/0x23a
[ 0.000000] [<ffffffff81d80120>] ? early_idt_handlers+0x120/0x120
[ 0.000000] [<ffffffff81d883a2>] setup_arch+0x462/0xcc6
[ 0.000000] [<ffffffff81d80120>] ? early_idt_handlers+0x120/0x120
[ 0.000000] [<ffffffff81d80167>] ? early_idt_handler+0x47/0xb7
[ 0.000000] [<ffffffff81d80120>] ? early_idt_handlers+0x120/0x120
[ 0.000000] [<ffffffff81d80cf0>] start_kernel+0x97/0x456
[ 0.000000] [<ffffffff81d80120>] ? early_idt_handlers+0x120/0x120
[ 0.000000] [<ffffffff81d80120>] ? early_idt_handlers+0x120/0x120
[ 0.000000] [<ffffffff81d805ee>] x86_64_start_reservations+0x2a/0x2c
[ 0.000000] [<ffffffff81d8072e>] x86_64_start_kernel+0x13e/0x14d
[ 0.000000] RIP 0xba2
--yliu
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