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

From: Dan Williams
Date: Thu Feb 06 2014 - 14:12:54 EST

On Thu, Feb 6, 2014 at 6:27 AM, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> 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

Thank you for the debug help!

Attachment: debug-overlap
Description: Binary data