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Date: Wed, 6 Jun 2007 10:52:23 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Andy Whitcroft <apw@shadowen.org>
Cc: linux-kernel@vger.kernel.org, Len Brown <len.brown@intel.com>,
       "Yu, Luming" <luming.yu@intel.com>,
       Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>,
       linux-acpi@vger.kernel.org
Subject: Re: 2.6.22-rc4-mm1 -- x86_64 ACPI panic
Message-Id: <20070606105223.c8dece17.akpm@linux-foundation.org>
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	<4666BDF1.6080801@shadowen.org>
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On Wed, 06 Jun 2007 15:00:17 +0100 Andy Whitcroft <apw@shadowen.org> wrote:

> Getting this on a bigger x86_64 (bl6-13):
> 
> Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
>  [<ffffffff8037898b>] acpi_processor_throttling_seq_show+0xa7/0xd6
> PGD 2d77067 PUD 34c3067 PMD 0
> Oops: 0000 [1] SMP
> CPU 3
> Modules linked in: video output button battery asus_acpi ac lp
> parport_pc parport floppy nvram amd_rng rng_core i2c_amd756 i2c_core
> Pid: 1634, comm: head Not tainted 2.6.22-rc4-mm1-autokern1 #1
> RIP: 0010:[<ffffffff8037898b>]  [<ffffffff8037898b>]
> acpi_processor_throttling_seq_show+0xa7/0xd6
> RSP: 0018:ffff810003c9de48  EFLAGS: 00010246
> RAX: 0000000000000020 RBX: ffff8100029e7800 RCX: 0000000000000000
> RDX: 000000000000002a RSI: ffffffff805993e4 RDI: ffff810002d714c0
> RBP: ffff810002d714c0 R08: ffff810003f82051 R09: ffff810002d714c0
> R10: ffffffffffffffff R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff64fd2b90
> FS:  00002b3545aec6f0(0000) GS:ffff810001683a40(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000000000 CR3: 0000000003966000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process head (pid: 1634, threadinfo ffff810003c9c000, task ffff810001c8c810)
> Stack:  00000000000000d0 ffff810002d714c0 0000000000000001 0000000000000001
>  0000000000002000 ffffffff802ab6eb ffff810003c9df50 ffff810002915d00
>  ffff810002d714f0 ffff810002fa2000 0000000000000000 fffffffffffffffb
> Call Trace:
>  [<ffffffff802ab6eb>] seq_read+0x105/0x28e
>  [<ffffffff802ab5e6>] seq_read+0x0/0x28e
>  [<ffffffff802cd085>] proc_reg_read+0x80/0x9a
>  [<ffffffff802925a7>] vfs_read+0xcb/0x153
>  [<ffffffff80292943>] sys_read+0x45/0x6e
>  [<ffffffff8020bc5e>] system_call+0x7e/0x83
> 
> 
> Code: 45 8b 44 0d 00 44 89 e1 0f 45 d0 31 c0 49 ff c4 49 83 c5 28
> RIP  [<ffffffff8037898b>] acpi_processor_throttling_seq_show+0xa7/0xd6
>  RSP <ffff810003c9de48>
> CR2: 0000000000000000
> FATAL: Error inserting acpi_cpufreq
> (/lib/modules/2.6.22-rc4-mm1-autokern1/kernel/arch/x86_64/kernel/cpufreq/acpi-cpufreq.ko):
> No such device

Was the oops at modprobe time?  If so, it seems weird that
acpi_processor_throttling_seq_show() would be getting run at that stage.

(The oops trace is supposed to show the oopsing process's
task_struct.comm[], but it isn't shown here?)

Anyway, there are extensive changes in there added by git-acpi.patch.  I
suppose we can try to limp along with the below, but it'll probably just
oops later on.

--- a/drivers/acpi/processor_throttling.c~git-acpi-disable-acpi_processor_throttling_seq_show
+++ a/drivers/acpi/processor_throttling.c
@@ -648,6 +648,9 @@ static int acpi_processor_throttling_seq
 		goto end;
 	}
 
+	seq_puts(seq, "acpi_processor_throttling_seq_show() is busted\n");
+	goto end;
+
 	seq_printf(seq, "state count:             %d\n"
 		   "active state:            T%d\n"
 		   "state available: T%d to T%d\n",
_

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