netdev - Re: igb_poll - device driver failed to check map error

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Message-ID: <514284EA.3050305@gmail.com>
Date:	Thu, 14 Mar 2013 19:18:18 -0700
From:	Alexander Duyck <alexander.duyck@...il.com>
To:	christoph.paasch@...ouvain.be
CC:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Subject: Re: igb_poll - device driver failed to check map error

On 03/12/2013 02:31 AM, Christoph Paasch wrote:
> Hello,
> 
> I'm seeing a warning while booting my machine when DMA_API_DEBUG is set:
> 
> [   36.402824] ------------[ cut here ]------------
> [   36.458070] WARNING: at /home/cpaasch/builder/net-next/lib/dma-debug.c:934 
> check_unmap+0x648/0x702()
> [   36.567377] Hardware name: ProLiant DL165 G7
> [   36.618452] igb 0000:04:00.0: DMA-API: device driver failed to check map 
> error[device address=0x0000000233d9b232] [size=154 bytes] [mapped as single]
> [   36.776640] Modules linked in:
> [   36.815446] Pid: 0, comm: swapper/7 Not tainted 3.9.0-rc1-mptcp+ #101
> [   36.892515] Call Trace:
> [   36.921745]  <IRQ>  [<ffffffff8102ad7f>] warn_slowpath_common+0x80/0x9a
> [   37.001023]  [<ffffffff8102ae2d>] warn_slowpath_fmt+0x41/0x43
> [   37.069771]  [<ffffffff811db17f>] check_unmap+0x648/0x702
> [   37.134363]  [<ffffffff811db3e9>] debug_dma_unmap_page+0x50/0x52
> [   37.206234]  [<ffffffff8136676a>] igb_poll+0x144/0xf7c
> [   37.267706]  [<ffffffff8104dd19>] ? sched_clock_cpu+0x46/0xd1
> [   37.336456]  [<ffffffff814458ce>] net_rx_action+0xa7/0x1d0
> [   37.402085]  [<ffffffff81030b65>] __do_softirq+0xb4/0x16f
> [   37.466673]  [<ffffffff81030c90>] irq_exit+0x40/0x87
> [   37.526067]  [<ffffffff81002db1>] do_IRQ+0x98/0xaf
> [   37.583378]  [<ffffffff815210aa>] common_interrupt+0x6a/0x6a
> [   37.651086]  <EOI>  [<ffffffff8105d4be>] ? 
> __tick_nohz_idle_enter+0x116/0x31f
> [   37.736595]  [<ffffffff81008a04>] ? default_idle+0x24/0x39
> [   37.802224]  [<ffffffff81008c62>] cpu_idle+0x68/0xa4
> [   37.861616]  [<ffffffff81519f78>] start_secondary+0x1a9/0x1ad
> [   37.930364] ---[ end trace 01b5bb0fd75a464c ]---
> 
> 
> It happens shortly after mounting the NFS-root filesystem.
> 
> I tried to understand what is going on, but I am now at my wit's end.
> 
> By adding some print-statements, here is what I found out (not sure if this is 
> anyhow helpful):
> 
> The difference between tx_buffer->time_stamp and the current 'jiffies' is up 
> to 2000 jiffies (HZ==1000) at the first time the above warning happens (this 
> seems too much for me). From then on, I see my print 3-4 times appear but 
> without such a big difference between the timestamps (difference around 1 and 
> 2 jiffies).
> 
> Some other stuff, I printed:
> tx_buffer->skb: ffff880235054c80
> tx_buffer->bytecount: 154 
> tx_buffer->gso_segs: 1
> tx_buffer->protocol: 8 
> tx_buffer->tx_flags 0x20
> 
> 
> One last thing:
> Am I right that after each call to dma_map_single/page a call to 
> dma_mapping_error is needed? If that's the case, I have some patches that add 
> this statement at missing places in the e1000, e1000e and ixgb driver. But 
> these patches do not fix my above problem.
> 
> 
> Thanks for your help,
> Christoph
> 

Christoph,

One thing that might be useful would be to reproduce this with a
standard 3.9-rc kernel instead of one using the multipath TCP patches.
This will help us to verify that the issue is reproducible with a stock
kernel and is not related to any ongoing work you may have only in your
tree.

Thanks,

Alex
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