linux-kernel - bad page table when accessing /dev/mem in dmidecode

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Message-ID: <20080121024422.GA23494@basil.nowhere.org>
Date:	Mon, 21 Jan 2008 03:44:22 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	venkatesh.pallipadi@...el.com, mingo@...e.hu, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: bad page table when accessing /dev/mem in dmidecode


When booting git-x86 tip 28a0fcd6b38e247200bd857996375aee91eae8ce
on a core2 system the userland running dmidecode at boot hits:

config: 64bit make defconfig

-Andi

Failed services in runlevel 3:                                     acpid
dmidecode: Corrupted page table at address 7f74475d2000
PGD 7b583067 PUD 7b599067 PMD 7b598067 PTE ffffffff000f0025
Bad pagetable: 000d [1] SMP
CPU 0
Modules linked in:
Pid: 2724, comm: dmidecode Not tainted 2.6.24-rc8-g28a0fcd6 #1
RIP: 0033:[<00007f744732423f>]  [<00007f744732423f>]
RSP: 002b:00007fff4f5f1300  EFLAGS: 00010206
RAX: 0000000000d21010 RBX: 00007f74475d2000 RCX: 0000000000001000
RDX: 0000000000010000 RSI: 00007f74475d2000 RDI: 0000000000d21010
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f74475f1c60
R10: 0000000000000001 R11: 0000000000008000 R12: 0000000000010000
R13: 0000000000000003 R14: 0000000000010000 R15: 00000000004086c4
FS:  00007f74475e26e0(0000) GS:ffffffff80747000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00007f74475d2000 CR3: 000000007b4a3000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process dmidecode (pid: 2724, threadinfo ffff81007c094000, task ffff81007de917d0)

RIP  [<00007f744732423f>]
 RSP <00007fff4f5f1300>
---[ end trace f63babdc9d8f7076 ]---

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