linux-kernel - Re: input0: bad kobj_uevent_env content in show

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Date:	Tue, 4 Sep 2012 19:54:05 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	linux-input@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, bjorn@...k.no,
	chunkeey@...glemail.com, linville@...driver.com,
	LKML <linux-kernel@...r.kernel.org>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: input0: bad kobj_uevent_env content in show_uevent()

On Tue, Sep 04, 2012 at 01:46:04PM +0200, Jean Delvare wrote:
> On Sun, 2 Sep 2012 16:34:02 +0800, Fengguang Wu wrote:
> > It's more than the input device that can trigger the panic.
> > Here is another trace which panics on accessing dmi/id/uevent:
> > 
> > [   32.380795] sysfs_read_file: /sys/devices/virtual/dmi/id/uevent
> > [   32.399379] dmi id: uevent 73 env[1677721600]: id/.../id
> > [   32.400780] uevent 0 env[0]: (null)
> > [   32.401695] uevent 7 env[1]: (null)
> > ...
> > [   32.478415] general protection fault: 0000 [#1] PREEMPT 
> > [   32.479953] CPU 0 
> > [   32.480433] Pid: 114, comm: trinity-child0 Not tainted 3.6.0-rc4-bisect2-00001-gb6d86d3-dirty #26 Bochs Bochs
> > [   32.482995] RIP: 0010:[<ffffffff81266c33>]  [<ffffffff81266c33>] strnlen+0x23/0x70
> > ...
> > [   32.486234] Call Trace:
> > [   32.486234]  [<ffffffff81268d5c>] string.isra.4+0x4c/0x120
> > [   32.486234]  [<ffffffff81269f19>] vsnprintf+0x2c9/0x900
> > [   32.486234]  [<ffffffff8126a9c9>] vscnprintf+0x19/0x50
> > [   32.486234]  [<ffffffff8105f8c7>] vprintk_emit+0xe7/0x750
> > [   32.486234]  [<ffffffff81a49ba9>] printk+0x4f/0x58
> > [   32.486234]  [<ffffffff8150522b>] show_uevent+0x1cb/0x220
> > [   32.486234]  [<ffffffff81501dcb>] dev_attr_show+0x2b/0x90
> > [   32.486234]  [<ffffffff81174bea>] ? sysfs_read_file+0x18a/0x320
> > [   32.486234]  [<ffffffff810f2974>] ? __get_free_pages+0x24/0xc0
> > [   32.486234]  [<ffffffff81174c2d>] sysfs_read_file+0x1cd/0x320
> 
> I can't reproduce this, sorry, so I can't look into it. If it takes
> special steps to reproduce, please tell me, as I wasn't part of the
> original discussion.

Hi Jean, Bjørn proposed a fix to this bug:

https://lkml.org/lkml/2012/9/2/94

But thank you the same for looking into this!

Thanks,
Fengguang
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