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

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Date:	Thu, 7 Nov 2013 10:04:55 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Axel Lin <axel.lin@...ics.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!

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?


Thanks,
-- 
Ming Lei
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