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Date: Tue, 22 Jun 2010 16:43:24 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Jeffrey Merkey <jeffmerkey@...il.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, Dan Williams <dan.j.williams@...el.com>, netdev <netdev@...r.kernel.org> Subject: Re: 2.6.34 Crash in dmaengine_put() Le mardi 22 juin 2010 à 08:08 -0600, Jeffrey Merkey a écrit : Please dont top post on lkml (or netdev) messages > 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. > Then dont do that ? No need to send us a trace, unless you use a pristine kernel. IFF_UP changes rules are very strict, dont try to avoid them and claim there is a hole or something wrong. Check __dev_open() , __dev_close() and __dev_change_flags() were OR/AND IFF_UP is done by core network. Net drivers are not allowed to change IFF_UP themselves. (DE-600 & DE-620 being the exceptions to confirm this rule, of course) > 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 netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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