linux-kernel - Re: BUG: scheduling while atomic: swapper/1/0x00000002 in 2.6.27-rc1-tip

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Date:	Mon, 11 Aug 2008 21:42:40 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh <jaswinderlinux@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Oruba <peter.oruba@....com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: BUG: scheduling while atomic: swapper/1/0x00000002 in
	2.6.27-rc1-tip


* Jaswinder Singh <jaswinderlinux@...il.com> wrote:

> Hello Ingo,
> 
> I am getting this while booting :
> 
> hub 4-0:1.0: USB hub found
> hub 4-0:1.0: 2 ports detected
> BUG: scheduling while atomic: swapper/1/0x00000002
> Modules linked in:
> Pid: 1, comm: swapper Not tainted 2.6.27-rc1-tip #13
>  [<c03ab719>] schedule+0xa9/0x68a
>  [<c01e7dff>] idr_get_empty_slot+0x13b/0x1e5
>  [<c01e7dff>] idr_get_empty_slot+0x13b/0x1e5
>  [<c03abe38>] schedule_timeout+0x13/0x99
>  [<c01170db>] __wake_up+0x29/0x39
>  [<c03ab5b9>] wait_for_common+0xab/0x105
>  [<c0119cb7>] default_wake_function+0x0/0x8
>  [<c0129d8d>] call_usermodehelper_exec+0x62/0xa2
>  [<c01e905c>] kobject_uevent_env+0x2d4/0x308
>  [<c0264418>] device_add+0x3ab/0x4e6
>  [<c02645db>] device_create_vargs+0x78/0x99
>  [<c026461a>] device_create+0x1e/0x24
>  [<c023df7d>] misc_register+0xb4/0xef
>  [<c010f696>] microcode_init+0x2a/0xb0
>  [<c010103a>] _stext+0x3a/0x12a
>  [<c04cb47e>] microcode_intel_module_init+0x0/0x35
>  [<c0119cae>] try_to_wake_up+0x154/0x15d
>  [<c012a402>] __create_workqueue_key+0xcf/0x1c1
>  [<c04c0627>] kernel_init+0x177/0x1db
>  [<c04c04b0>] kernel_init+0x0/0x1db
>  [<c0103923>] kernel_thread_helper+0x7/0x10
>  =======================
> BUG: scheduling while atomic: swapper/1/0x00000002
> Modules linked in:
> Pid: 1, comm: swapper Not tainted 2.6.27-rc1-tip #13
>  [<c03ab719>] schedule+0xa9/0x68a
>  [<c01e7dff>] idr_get_empty_slot+0x13b/0x1e5
>  [<c03abe38>] schedule_timeout+0x13/0x99
>  [<c01170db>] __wake_up+0x29/0x39
>  [<c03ab5b9>] wait_for_common+0xab/0x105
>  [<c0119cb7>] default_wake_function+0x0/0x8
>  [<c0129d8d>] call_usermodehelper_exec+0x62/0xa2
>  [<c01e905c>] kobject_uevent_env+0x2d4/0x308
>  [<c0264418>] device_add+0x3ab/0x4e6
>  [<c01eb2d0>] strlcpy+0x11/0x3d
>  [<c02665b4>] platform_device_add+0xc9/0xf7
>  [<c026673c>] platform_device_register_simple+0x34/0x4a
>  [<c010f70c>] microcode_init+0xa0/0xb0
>  [<c010103a>] _stext+0x3a/0x12a
>  [<c04cb47e>] microcode_intel_module_init+0x0/0x35
>  [<c0119cae>] try_to_wake_up+0x154/0x15d
>  [<c012a402>] __create_workqueue_key+0xcf/0x1c1
>  [<c04c0627>] kernel_init+0x177/0x1db
>  [<c04c04b0>] kernel_init+0x0/0x1db
>  [<c0103923>] kernel_thread_helper+0x7/0x10
>  =======================
> Microcode Update Driver: v2.00 <tigran@...azian.fsnet.co.uk>
> <peter.oruba@....com>
> initcall microcode_intel_module_init+0x0/0x35 returned with preemption
> imbalance
> highmem bounce pool size: 64 pages
> 
> 
> Attaching config for reference.

i've Cc:-ed Peter Oruba who has changed this code recently. Peter, 
there's apparently a preemption count leak in the new microcode 
codepaths. Either a missing unlock or some cpu_get/put imbalance or 
similar mishap. Any ideas?

	Ingo
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