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

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Date:	Tue, 04 Sep 2012 13:56:00 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Fengguang Wu <fengguang.wu@...el.com>, linux-input@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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()

Jean Delvare <khali@...ux-fr.org> writes:
> 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.

The "only" step required is disabling CONFIG_HOTPLUG.

But that can be challenging.  I believe Fengguang Wu already posted some
configs.  I am attaching the config I used as well, booting this under
qemu-kvm using virtio-net-pci and ide devices.  Although my config isn't
optimized for fast builds or anything and probably enables many
unnecessary drivers.


Bjørn


View attachment ".config" of type "text/plain" (76197 bytes)