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

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Message-ID: <84816226.20140206123631@eikelenboom.it>
Date:	Thu, 6 Feb 2014 12:36:31 +0100
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	Dan Williams <dan.j.williams@...el.com>
CC:	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

Hi Dan / Francois,

Didn't have time to test it before, but the patch doesn't seem to help.
I'm still getting the "DMA-API: exceeded 7 overlapping mappings of pfn 55ebe",
but i see now i forgot to mention i use r8169.use_dac=1 ...

Not using it seems to prevent the warning, but before 3.14 i have never seen this (with r8169.use_dac=1)

--
Sander

Wednesday, January 29, 2014, 4:06:24 AM, you wrote:

> On Sun, Jan 26, 2014 at 4:03 PM, Francois Romieu <romieu@...zoreil.com> wrote:
>> Sander Eikelenboom <linux@...elenboom.it> :
>> [...]
>>> I have got a regression with a 3.14-mw kernel (last commit is 4ba9920e5e9c0e16b5ed24292d45322907bb9035):
>>> It looks like it's related to the rtl8169 ...
>>>
>>> --
>>> Sander
>>>
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.105537] ------------[ cut here ]------------
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.116779] WARNING: CPU: 0 PID: 0 at lib/dma-debug.c:491 add_dma_entry+0x103/0x130()
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.128148] DMA-API: exceeded 7 overlapping mappings of pfn 55ebe
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.139397] Modules linked in:
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.150535] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.13.0-20140125-mw-pcireset+ #1
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.161784] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , BIOS V1.8B1 09/13/2010
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.172965]  0000000000000009 ffff88005f603838 ffffffff81acbcfa ffffffff822134e0
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.184156]  ffff88005f603888 ffff88005f603878 ffffffff810bdf62 ffff880000000000
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.195186]  0000000000055ebe 00000000ffffffef 0000000000000200 ffff8800592ea098
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.206227] Call Trace:
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.217027]  <IRQ>  [<ffffffff81acbcfa>] dump_stack+0x46/0x58
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.227907]  [<ffffffff810bdf62>] warn_slowpath_common+0x82/0xb0
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.238678]  [<ffffffff810be031>] warn_slowpath_fmt+0x41/0x50
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.249336]  [<ffffffff81471c5a>] ? active_pfn_read_overlap+0x3a/0x70
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.259904]  [<ffffffff814729e3>] add_dma_entry+0x103/0x130
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.270416]  [<ffffffff81472de6>] debug_dma_map_page+0x126/0x150
>>> Jan 26 11:36:26 serveerstertje kernel: [   89.280840]  [<ffffffff81714686>] rtl8169_start_xmit+0x216/0xa20
>> [r8169 and xen stuff]
>>
>> Dan, I miss the part of the debug code that tells where the mappings were
>> previously set.

> In this case it was a facepalm mistake on my part.  The mappings were
> not being properly accounted in the last revision of the patch I sent.
>  I copied you on the fix [1].

> --
> Dan

> [1]: http://marc.info/?l=linux-netdev&m=139096447627032&w=2


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