linux-kernel - Re: [BUG] 2.6.22-rc3-mm1 remove bluetooth usb adapter caused kmalloc bug

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Date:	Wed, 6 Jun 2007 07:18:00 +0000
From:	"dave young" <hidave.darkstar@...il.com>
To:	"Christoph Lameter" <clameter@....com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] 2.6.22-rc3-mm1 remove bluetooth usb adapter caused kmalloc bug

Hi,

>2007/6/6, Christoph Lameter <clameter@....com>:
> Note that the corruption seems to have its cause in a decrement done at
> offset 16 into the object pointing to the refcount in struct hci_dev. So
> it looks like the refcount was decremented after the object was freed.
>
> sysfs related?
>

I tested several more times under 2.6.22-rc4, there's  no such problem.

The hci_dev_put is indeed a bug, isn't it? it decrement the refcout on
more time like you said.

But why the slub doesn't warning under 2.6.22-rc4 but do under
2.6.22-rc3-mm1? I'm puzzled.

And if this is a bug , should I write another post to list?  then to
mm or mainline?
I'm still new to kernel list,  thanks you all.

Regards
dave
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