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Date:	Mon, 28 Dec 2009 17:15:41 +0100
From:	Paul Rolland <rol@...917.net>
To:	Paul Rolland (ポール・ロラン) 
	<rol@...be.net>
Cc:	Ingo Molnar <mingo@...e.hu>, Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Matthew Garrett <mjg@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	rol@...be.net
Subject: Re: -tip: origin tree boot crash

Hello,

On Mon, 28 Dec 2009 16:02:12 +0100
Paul Rolland (ポール・ロラン)  <rol@...be.net> wrote:

> Message from syslogd@tux at Dec 28 16:00:22 ...
>  kernel:CR2: 0000000100000024
> Dec 28 16:00:22 tux kernel: ACPI: WMI: Mapper loaded
> Dec 28 16:00:22 tux kernel: input: Dell WMI hotkeys
> as /devices/virtual/input/input13 Dec 28 16:00:22 tux kernel: BUG: unable
> to handle kernel paging request at 0000000100000024 Dec 28 16:00:22 tux
> kernel: IP: [<ffffffffa0003789>] wmi_install_notify_handler+0x39/0x80
> [wmi] Dec 28 16:00:22 tux kernel: PGD 565f3067 PUD 0 Dec 28 16:00:22 tux
> kernel: Oops: 0000 [#1] SMP Dec 28 16:00:22 tux kernel: last sysfs
> file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq Dec 28
> 16:00:22 tux kernel: CPU 1 Dec 28 16:00:22 tux kernel: Pid: 20215, comm:
> modprobe Not tainted 2.6.33-rc2 #1 0T816J/Vostro 1520 Dec 28 16:00:22 tux
> kernel: RIP: 0010:[<ffffffffa0003789>]  [<ffffffffa0003789>]
> wmi_install_notify_handler+0x39/0x80 [wmi] Dec 28 16:00:22 tux kernel:
> RSP: 0018:ffff88009434bed8  EFLAGS: 00010202 Dec 28 16:00:22 tux kernel:
> RAX: 0000000000000015 RBX: ffffffffa014f0f0 RCX: 000000000000009d Dec 28
> 16:00:22 tux kernel: RDX: 00000000fffffff4 RSI: ffff88009434be98 RDI:
> ffff88009434be8c Dec 28 16:00:22 tux kernel: RBP: ffff88009434bef8 R08:
> ffff88009434be88 R09: 0000000000000010 Dec 28 16:00:22 tux kernel: R10:
> ffff88009434bee0 R11: 0000000000000006 R12: 0000000000000000 Dec 28
> 16:00:22 tux kernel: R13: 0000000002188470 R14: 0000000000000000 R15:
> 0000000000000000 Dec 28 16:00:22 tux kernel: FS:  00007fb6aa7446f0(0000)
> GS:ffff880028300000(0000) knlGS:0000000000000000 Dec 28 16:00:22 tux
> kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b Dec 28 16:00:22
> tux kernel: CR2: 0000000100000024 CR3: 00000000bd319000 CR4:
> 00000000000406e0 Dec 28 16:00:22 tux kernel: DR0: 0000000000000000 DR1:
> 0000000000000000 DR2: 0000000000000000 Dec 28 16:00:22 tux kernel: DR3:
> 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Dec 28
> 16:00:22 tux kernel: Process modprobe (pid: 20215, threadinfo
> ffff88009434a000, task ffff8800a3a0ace0) Dec 28 16:00:22 tux kernel:
> Stack: Dec 28 16:00:22 tux kernel: ffff88009434bef8 00000000fffffff4
> 0000000000000000 ffffffffa0152000 Dec 28 16:00:22 tux kernel: <0>
> ffff88009434bf18 ffffffffa0152142 0000000000000000 0000000000000000 Dec
> 28 16:00:22 tux kernel: <0> ffff88009434bf48 ffffffff810001d7
> 0000000000000000 ffffffffa014f780 Dec 28 16:00:22 tux kernel: Call Trace:
> Dec 28 16:00:22 tux kernel: [<ffffffffa0152000>] ?
> dell_wmi_init+0x0/0x14a [dell_wmi] Dec 28 16:00:22 tux kernel:
> [<ffffffffa0152142>] dell_wmi_init+0x142/0x14a [dell_wmi] Dec 28 16:00:22
> tux kernel: [<ffffffff810001d7>] do_one_initcall+0x37/0x190 Dec 28
> 16:00:22 tux kernel: [<ffffffff81074408>] sys_init_module+0xd8/0x250 Dec
> 28 16:00:22 tux kernel: [<ffffffff810024ab>]
> system_call_fastpath+0x16/0x1b Dec 28 16:00:22 tux kernel: Code: 65 f8 48
> 89 f3 49 89 d4 48 85 f6 74 35 48 85 ff 74 30 48 8d 75 e8 e8 27 fd ff ff
> 48 8b 55 e8 b8 06 00 00 00 48 85 d2 74 09 b0 15 <48> 83 7a 30 00 74 20 48
> 8b 5d f0 4c 8b 65 f8 c9 c3 66 0f 1f 44 Dec 28 16:00:22 tux kernel: RIP
> [<ffffffffa0003789>] wmi_install_notify_handler+0x39/0x80 [wmi] Dec 28
> 16:00:22 tux kernel: RSP <ffff88009434bed8> Dec 28 16:00:22 tux kernel:
> CR2: 0000000100000024 Dec 28 16:00:22 tux kernel: ---[ end trace
> d18b623021a6c139 ]---


I've fixed this one by changing wmi.c :

--- wmi.c       2009-12-28 17:11:52.000000000 +0100
+++ wmi.c.changed       2009-12-28 17:12:17.000000000 +0100
@@ -488,12 +488,13 @@
 {
        struct wmi_block *block;
        acpi_status status;
+       bool err;
 
        if (!guid || !handler)
                return AE_BAD_PARAMETER;
 
-       find_guid(guid, &block);
-       if (!block)
+       err = find_guid(guid, &block);
+       if (!err)
                return AE_NOT_EXIST;
 
        if (block->handler)

Signed-off-by: rol@...917.net <Paul Rolland>

but now I have :
input: Dell WMI hotkeys as /devices/virtual/input/input13
dell-wmi: Unable to register notify handler - 6
sys_init_module: 'dell_wmi'->init suspiciously returned 6, it should follow 0/-E convention
sys_init_module: loading module anyway...
Pid: 2220, comm: modprobe Not tainted 2.6.33-rc2 #1
Call Trace:
 [<ffffffff8107450a>] sys_init_module+0x1da/0x250
 [<ffffffff810024ab>] system_call_fastpath+0x16/0x1b


Then, I tried to remove dell-wmi to fix the warning, and then I have :
BUG: unable to handle kernel NULL pointer dereference at 00000000000008b0
IP: [<ffffffffa024971b>] wmi_remove_notify_handler+0x2b/0x60 [wmi]
PGD bb506067 PUD bd170067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
CPU 1 
Pid: 3833, comm: rmmod Not tainted 2.6.33-rc2 #1 0T816J/Vostro 1520
RIP: 0010:[<ffffffffa024971b>]  [<ffffffffa024971b>] wmi_remove_notify_handler+0x2b/0x60 [wmi]
RSP: 0000:ffff8800bd3e7ea8  EFLAGS: 00010202
RAX: 000000000000000a RBX: 0000000000000880 RCX: 000000000000009d
RDX: 0000000000000000 RSI: ffff8800bd3e7e68 RDI: 0000000000000880
RBP: ffff8800bd3e7eb8 R08: ffff8800bd3e7e58 R09: 0000000000000010
R10: ffff8800bd3e7eb0 R11: 0000000000000006 R12: ffffffffa0251780
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f628c4c46f0(0000) GS:ffff880028300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00000000000008b0 CR3: 00000000bb429000 CR4: 00000000000406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process rmmod (pid: 3833, threadinfo ffff8800bd3e6000, task ffff88013e43d9c0)
Stack:
 ffff8800bd3e7ec8 0000000000000880 ffff8800bd3e7ec8 ffffffffa0251374
<0> ffff8800bd3e7f78 ffffffff81072091 ffff88010aa39040 ffff88013e43d9c0
<0> ffffffffa0251780 ffffffff00000880 ffff8800bd3e7f14 ffffffff81024461
Call Trace:
 [<ffffffffa0251374>] dell_wmi_exit+0x10/0x1e [dell_wmi]
 [<ffffffff81072091>] sys_delete_module+0x1b1/0x290
 [<ffffffff81024461>] ? do_page_fault+0x131/0x2d0
 [<ffffffff810024ab>] system_call_fastpath+0x16/0x1b
Code: 55 b8 01 10 00 00 48 89 e5 48 83 ec 10 48 85 ff 74 3f 48 8d 75 f8 e8 95 fd ff ff 48 8b 7d f8 b8 06 00 00 00 48 85 ff 74 28 b0 0a <48> 83 7f 30 00 74 1f 31 f6 e8 37 ff ff ff 48 8b 55 f8 48 c7 42 
RIP  [<ffffffffa024971b>] wmi_remove_notify_handler+0x2b/0x60 [wmi]
 RSP <ffff8800bd3e7ea8>
CR2: 00000000000008b0
---[ end trace b8447e2a4bf54240 ]---

Paul


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