linux-kernel - Intel BIOS - Corrupted low memory at ffff880000004200

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Date:	Mon, 06 Jul 2009 16:56:34 +0200
From:	Alexey Fisher <bug-track@...her-privat.net>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	"Richard A. Holden III" <aciddeath@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Intel BIOS - Corrupted low memory at ffff880000004200

Hallo Ingo, Richard.

I'm getting "Corrupted low memory" trace with my Intel DG45ID board 
after resume. This board  has different dmi-bios-vendor... so probably 
it will be nice to have it in your patch.

Here is trace after resume:
===============================================

[  600.816088] Corrupted low memory at ffff880000004200 (4200 phys) = 
00420301
[  600.816093] ------------[ cut here ]------------
[  600.816100] WARNING: at arch/x86/kernel/check.c:134 
check_for_bios_corruption+0xe4/0xf0()
[  600.816102] Hardware name:
[  600.816103] Memory corruption detected in low memory
[  600.816105] Modules linked in: nls_iso8859_1 nls_cp437 vfat fat 
binfmt_misc kvm_intel kvm snd_hda_codec_intelhdmi snd_hda_codec_idt 
snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm 
snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event 
snd_seq snd_timer snd_seq_device snd psmouse soundcore e1000e serio_raw 
iTCO_wdt iTCO_vendor_support snd_page_alloc
[  600.816129] Pid: 9, comm: events/0 Tainted: G        W 
2.6.31-rc1-25446-g1ae8c0a #1
[  600.816131] Call Trace:
[  600.816136]  [<ffffffff8104a8e8>] warn_slowpath_common+0x78/0xb0
[  600.816139]  [<ffffffff8104a97c>] warn_slowpath_fmt+0x3c/0x40
[  600.816142]  [<ffffffff8102aff4>] check_for_bios_corruption+0xe4/0xf0
[  600.816145]  [<ffffffff8102b000>] ? check_corruption+0x0/0x30
[  600.816148]  [<ffffffff8102b009>] check_corruption+0x9/0x30
[  600.816152]  [<ffffffff8105e4d4>] worker_thread+0x144/0x260
[  600.816155]  [<ffffffff810635c0>] ? autoremove_wake_function+0x0/0x40
[  600.816158]  [<ffffffff8105e390>] ? worker_thread+0x0/0x260
[  600.816161]  [<ffffffff810631e6>] kthread+0x96/0xa0
[  600.816165]  [<ffffffff8100c69a>] child_rip+0xa/0x20
[  600.816168]  [<ffffffff81063150>] ? kthread+0x0/0xa0
[  600.816171]  [<ffffffff8100c690>] ? child_rip+0x0/0x20
[  600.816173] ---[ end trace 03ff161c20a96dae ]---

=====================================================================

result of "dmidecode -s bios-vendor" is "Intel Corp."


here is patch against latest git. It's working fine with my board.

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index de2cab1..89d00e2 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -672,6 +672,13 @@ static struct dmi_system_id __initdata 
bad_bios_dmi_table[] = {
                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
                 },
         },
+        {
+                .callback = dmi_low_memory_corruption,
+                .ident = "Intel BIOS",
+                .matches = {
+                        DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
+                },
+        },
  #endif
         {}
  };


In attachment you can see dmesg before bios patch and after.

View attachment "dmesg_after_w_drm_patch" of type "text/plain" (58399 bytes)

View attachment "dmesg_after_bios_patch" of type "text/plain" (56794 bytes)