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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. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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