linux-kernel - Re: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7 overlapping mappings of pfn 55ebe

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Message-ID: <CAPcyv4j44ZHmaqUBj3rXv-C7Hr72Z15g=2nFBD=1iYLnhSQQ4g@mail.gmail.com>
Date:	Thu, 6 Feb 2014 11:12:15 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	Sander Eikelenboom <linux@...elenboom.it>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Wei Liu <wei.liu2@...rix.com>,
	Francois Romieu <romieu@...zoreil.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7
 overlapping mappings of pfn 55ebe

On Thu, Feb 6, 2014 at 6:27 AM, Sander Eikelenboom <linux@...elenboom.it> wrote:
>>>> Not using it seems to prevent the warning, but before 3.14 i have never seen this (with r8169.use_dac=1)
>
>> If you are still hitting this with the patch:
>
>>   59f2e7df574c dma-debug: fix overlap detection
>
>> ...then I'm more inclined to think it is an actual positive report.
>
>> If you don't mind I'll send some debug patches to narrow this down.
>
> Please do .. sounds better than bisecting :-)
>

Hi, attached is a patch that should give some insight whether the
driver is triggering many overlapping mappings.  Try it on top of
3.14-rc1.

Thank you for the debug help!

Download attachment "debug-overlap" of type "application/octet-stream" (1965 bytes)