linux-kernel - Re: 2.6.34 Crash in dmaengine

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Message-ID: <AANLkTimsDSrEL8vT877pLYSa4A338p4Y8w0Ya6Xm7BFJ@mail.gmail.com>
Date:	Tue, 22 Jun 2010 08:08:17 -0600
From:	Jeffrey Merkey <jeffmerkey@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>
Subject: Re: 2.6.34 Crash in dmaengine_put()

OK.  This bug occurs if you OR in the IFF_UP flag while creating
virtual interfaces without going through the normal ifup/ifdown
scripts.  Looks like a hole.  I will post the trace shortly.  It's
easy to reproduce, take the dummy net driver, OR in the IFF_UP flag in
dummy_setup, and watch the kernel crash.

Jeff

On Mon, Jun 21, 2010 at 9:28 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Mon, 21 Jun 2010 20:57:40 -0600 Jeffrey Merkey <jeffmerkey@...il.com> wrote:
>
>> If someone sets the IFF_UP flags in the netdev structure without going
>> through ifup userspace stuff, during unregister of the the netdev
>> the dmaengine-put code will decrement the reference counter negative,
>> and crash at BUG! in the driver/dma/dmaengine.c code.  This seems
>> busted.
>>
>
> Please send a copy of the kernel BUG trace.
>
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