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Subject-tip: origin tree boot crash

Today's -tip crashed during bootup on one of my testsystems:

[ 28.616777] initcall eeepc_laptop_init+0x0/0x4d returned -19 after 29853 usecs
[ 28.624002] calling dell_wmi_init+0x0/0x126 @ 1
[ 28.629128] device: 'input1': device_add
[ 28.633113] PM: Adding info for No Bus:input1
[ 28.637678] input: Dell WMI hotkeys as /class/input/input1
[ 28.643216] evbug.c: Connected device: input1 (Dell WMI hotkeys at wmi/input0)
[ 28.650449] BUG: unable to handle kernel NULL pointer dereference at 00000014
[ 28.654439] IP: [<c17f7f21>] wmi_install_notify_handler+0x31/0x70
[ 28.654439] *pde = 00000000
[ 28.654439] Oops: 0000 [#1] DEBUG_PAGEALLOC
[ 28.654439] last sysfs file:
[ 28.654439] Modules linked in:
[ 28.654439]
[ 28.654439] Pid: 1, comm: swapper Not tainted 2.6.33-rc2-tip-00158-g2bd999a-dirty #2238 A8N-E/System Product Name
[ 28.654439] EIP: 0060:[<c17f7f21>] EFLAGS: 00010282 CPU: 0
[ 28.654439] EIP is at wmi_install_notify_handler+0x31/0x70
[ 28.654439] EAX: 00000006 EBX: c17f55d0 ECX: 0000009d EDX: fffffff4
[ 28.654439] ESI: 00000000 EDI: 00000000 EBP: f7052f90 ESP: f7052f84
[ 28.654439] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
[ 28.654439] Process swapper (pid: 1, ti=f7052000 task=f7070000 task.ti=f7052000)
[ 28.654439] Stack:
[ 28.654439] fffffff4 00000000 00000006 f7052fa4 c2165992 aa66398a 00000006 aa66398a
[ 28.654439] <0> f7052fd0 c1001122 c1d58799 c2165874 00000001 0000749d 00000000 c2165874
[ 28.654439] <0> c219a214 c21271d6 00000000 f7052fe4 c2127262 00000000 000000e0 00000000
[ 28.654439] Call Trace:
[ 28.654439] [<c2165992>] ? dell_wmi_init+0x11e/0x126
[ 28.654439] [<c1001122>] ? do_one_initcall+0x32/0x1d0
[ 28.654439] [<c2165874>] ? dell_wmi_init+0x0/0x126
[ 28.654439] [<c2165874>] ? dell_wmi_init+0x0/0x126
[ 28.654439] [<c21271d6>] ? kernel_init+0x0/0xe0
[ 28.654439] [<c2127262>] ? kernel_init+0x8c/0xe0
[ 28.654439] [<c10033c6>] ? kernel_thread_helper+0x6/0x10
[ 28.654439] Code: 89 5d f8 89 75 fc e8 cf b4 80 ff 85 d2 89 d3 89 ce 74 2f 85 c0 74 2b 8d 55 f4 e8 0b fd ff ff 8b 55 f4 b8 06 00 00 00 85 d2 74 09 <8b> 4a 20 b0 15 85 c9 74 1e 8b 5d f8 8b 75 fc 89 ec 5d c3 8d 74
[ 28.654439] EIP: [<c17f7f21>] wmi_install_notify_handler+0x31/0x70 SS:ESP 0068:f7052f84
[ 28.654439] CR2: 0000000000000014
[ 28.819532] ---[ end trace 6cbbad4ca20c038d ]---
[ 28.824158] Kernel panic - not syncing: Fatal exception
[ 28.829394] Pid: 1, comm: swapper Tainted: G D 2.6.33-rc2-tip-00158-g2bd999a-dirty #2238
[ 28.838180] Call Trace:
[ 28.840626] [<c1aa71dc>] ? printk+0x1d/0x1f
[ 28.844909] [<c1aa7110>] panic+0x48/0xf7
[ 28.848930] [<c1aab609>] oops_end+0xb9/0xd0
[ 28.853210] [<c1020086>] no_context+0xc6/0x160
[ 28.857752] [<c10201b0>] __bad_area_nosemaphore+0x90/0x140
[ 28.863334] [<c1020277>] bad_area_nosemaphore+0x17/0x20
[ 28.868656] [<c1aacf5d>] do_page_fault+0x2dd/0x380
[ 28.873545] [<c17f55d0>] ? dell_wmi_notify+0x0/0x170
[ 28.878604] [<c1aacc80>] ? do_page_fault+0x0/0x380
[ 28.883494] [<c1aaaa90>] error_code+0x70/0x80
[ 28.887947] [<c17f55d0>] ? dell_wmi_notify+0x0/0x170
[ 28.893007] [<c17f7f21>] ? wmi_install_notify_handler+0x31/0x70
[ 28.899024] [<c2165992>] dell_wmi_init+0x11e/0x126
[ 28.903910] [<c1001122>] do_one_initcall+0x32/0x1d0
[ 28.908885] [<c2165874>] ? dell_wmi_init+0x0/0x126
[ 28.913774] [<c2165874>] ? dell_wmi_init+0x0/0x126
[ 28.918662] [<c21271d6>] ? kernel_init+0x0/0xe0
[ 28.923289] [<c2127262>] kernel_init+0x8c/0xe0
[ 28.927831] [<c10033c6>] kernel_thread_helper+0x6/0x10
The crash is due to this commit from yesterday's (v2.6.33-rc2) upstream tree:

| commit 1fdd407f4e3f2ecb453954cbebb6c22491c61853
| Author: Dmitry Torokhov <dmitry.torokhov@gmail.com>
| Date: Thu Dec 17 22:19:42 2009 -0800
|
| dell-wmi: do not keep driver loaded on unsupported boxes
|
| There is no point in having the driver loaded in memory if we fail
| to locate particular WMI GUID.
|
| Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
| Acked-by: Matthew Garrett <mjg@redhat.com>
| Signed-off-by: Len Brown <len.brown@intel.com>

I've reverted the commit from -tip for now.

Thanks,

Ingo


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