linux-kernel - Re: kernel BUG at kernel/kallsyms.c:222!

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Message-ID: <CAFRkauAEt-YhBt11opj_GVCLrxGsTSd2LowWGmukTSmGuJkd3A@mail.gmail.com>
Date:	Thu, 7 Nov 2013 10:18:58 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Russell King <linux@....linux.org.uk>,
	Michal Marek <mmarek@...e.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: kernel BUG at kernel/kallsyms.c:222!

2013/11/7 Ming Lei <tom.leiming@...il.com>:
> Hi,
>
> On Thu, Nov 7, 2013 at 9:53 AM, Axel Lin <axel.lin@...ics.com> wrote:
>> Hi,
>> I got below oops while debugging a sd controller driver:
>>
>> [    4.032026] ------------[ cut here ]------------
>> [    4.036730] kernel BUG at kernel/kallsyms.c:222!
>> [    4.041501] Internal error: Oops - BUG: 0 [#1] ARM
>> [    4.046847] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 3.12.0-00061-g0835d93-dirty #1657
>>
>> I can avoid the oops by either revert commit f6537f2f0eba4eba
>> "scripts/kallsyms: filter symbols not in kernel address space",
>> or comment out below line in drivers/mmc/core/sdio.c.
>>         dev_dbg(&card->dev, "calling %pF\n", f->vendor_fixup);
>>
>> The f->vendor_fixup points to add_quirk_for_sdio_devices.
>> It looks like the symbol add_quirk_for_sdio_devices is missing.
>>
>> So I revert commit f6537f2f and check /proc/kallsyms:
>> ~ # grep add_quirk_for_sdio_devices /proc/kallsyms
>> 00157bf8 t add_quirk_for_sdio_devices
>>
>> If I don't revert commit f6537f2f and just comment out above dev_dbg line,
>> Checking /proc/kallsyms then I got:
>> ~ # grep add_quirk_for_sdio_devices /proc/kallsyms
>> [sched_delayed] sched: RT throttling activated
>> BUG: soft lockup - CPU#0 stuck for 21s! [grep:59]
>>
>> CPU: 0 PID: 59 Comm: grep Not tainted 3.12.0-00061-g0835d93-dirty #1675
>> task: 01d36320 ti: 008be000 task.ti: 008be000
>>
>> BTW, I'm testing it on a noMMU platform (arm7tdmi).
>
> Could you share what is the value of CONFIG_PAGE_OFFSET
> on your noMMU platform?

$ grep  CONFIG_PAGE_OFFSET .config
CONFIG_PAGE_OFFSET=0xC0000000

>
>
> Thanks,
> --
> Ming Lei
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