linux-kernel - Re: ACPI bay - 2.6.20-rc3-mm1 hangs on boot

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Message-Id: <20070108130713.57f3f351.kristen.c.accardi@intel.com>
Date:	Mon, 8 Jan 2007 13:07:13 -0800
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Jiri Kosina <jikos@...os.cz>
Cc:	Len Brown <len.brown@...el.com>, Andrew Morton <akpm@...l.org>,
	linux-acpi@...el.com, linux-kernel@...r.kernel.org
Subject: Re: ACPI bay - 2.6.20-rc3-mm1 hangs on boot

On Fri, 5 Jan 2007 14:19:41 +0100 (CET)
Jiri Kosina <jikos@...os.cz> wrote:

> Hi,
> 
> 2.6.20-rc3-mm1 hangs on boot on my IBM T42p when compiled with ACPI_BAY=y. 
> Below is the trace of two BUGs I get.

Hi,
I was able to duplicate this problem - it only occurs when the bay
driver is built-in, not when the bay driver is compiled as a module.
While I work on the fix for the problem, you can as a temporary workaround
just use ACPI_BAY=m.  By the way, I also found that the bay driver will
not build at all if ACPI_DOCK=n.  Oops.  I will fix that too.

thanks,
Kristen


> 
> When compiled with ACPI_BAY=n, it boots fine.
> 
> The traces are hand-rewritten (no serial console on that machine), so I 
> have omitted the code offsets in the stacktraces.
> 
> ACPI: ACPI Dock Station Driver
> ACPI: \_SB_PCI0.IDE0.SCND.MSTR: found ejectable bay
> ACPI: \_SB_PCI0.IDE0.SCND.MSTR: Adding notify handler
> PM: Adding info for platform:bay.0
> ACPI: Bay [\_SB_.PCI0.IDE0.SCND.MSTR] Added
> BUG: at lib/kref.c:32 kref_get()
> 	kref_get+0x34/0x3b
> 	kobject_get+0xf/0x13
> 	get_bus+0xe/0x1d
> 	bus_add_driver+0x13/0x165
> 	init_waitqueue_head+0x12/0x1e
> 	bay_init+0x57/0x79
> 	find_bay+0x0/0x2c4
> 	init+0x88/0x16d
> 	restore_nocheck+0x12/0x15
> 	init+0x0/0x16d
> 	init+0x0/0x16d
> 	kernel_thread_helper+0x7/0x10
> 	==========
> BUG: at lib/kref.c:32 kref_get()
> 	kref_get+0x34/0x3b
> 	kobject_get+0xf/0x13
> 	kobject_init+0x5d/0x70
> 	kobject_set_name+0x5c/0x92
> 	bus_add_driver+0x50/0x79
> 	bay_init+0x57/0x79
> 	find_bay+0x0/0x2c4
> 	init+0x88/0x16d
> 	init+0x88/0x16d
> 	kernel_thread_helper+0x7/0x10
> 	=========
> 
> -- 
> Jiri Kosina
> 
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