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Date:	Mon, 8 Jun 2009 14:29:17 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [git pull] dma-debug updates for 2.6.31

On Sun, Jun 07, 2009 at 12:14:54PM +0200, Ingo Molnar wrote:
> 
> note, i'm getting this warning:
> 
> [   17.505263] ttyS0: 1 input overrun(s)
> [   18.537568] ------------[ cut here ]------------
> [   18.539366] WARNING: at lib/dma-debug.c:812 check_unmap+0x395/0x5e6()
> [   18.539366] Hardware name: System Product Name
> [   18.539366] forcedeth 0000:00:0a.0: DMA-API: device driver frees DMA memory with wrong function [device address=0x000000003b95296a] [size=90 bytes] [mapped as single] [unmapped as page]
> [   18.539366] Pid: 4316, comm: ifup-eth Not tainted 2.6.30-rc8-tip-01994-g0c51e15-dirty #50306
> [   18.539366] Call Trace:
> [   18.539366]  <IRQ>  [<ffffffff8146c4cc>] ? check_unmap+0x395/0x5e6
> [   18.539366]  [<ffffffff8105ac13>] warn_slowpath_common+0x83/0xc6
> [   18.539366]  [<ffffffff8105acd9>] warn_slowpath_fmt+0x4b/0x61
> [   18.539366]  [<ffffffff8146c234>] ? check_unmap+0xfd/0x5e6
> [   18.539366]  [<ffffffff8146c4cc>] check_unmap+0x395/0x5e6
> [   18.539366]  [<ffffffff8146c99f>] debug_dma_unmap_page+0x5e/0x74
> [   18.539366]  [<ffffffff816b1984>] nv_tx_done_optimized+0xb2/0x28a
> [   18.539366]  [<ffffffff81c9a5d2>] ? _spin_lock_irqsave+0x65/0x85
> [   18.539366]  [<ffffffff816b5aa1>] nv_napi_poll+0x28b/0x2ca
> [   18.539366]  [<ffffffff81a91d03>] net_rx_action+0xbd/0x22b
> [   18.539366]  [<ffffffff81a91e0b>] ? net_rx_action+0x1c5/0x22b
> [   18.539366]  [<ffffffff810a5015>] ? __rcu_process_callbacks+0x163/0x216
> [   18.539366]  [<ffffffff8106147b>] __do_softirq+0x85/0x136
> [   18.539366]  [<ffffffff81058362>] ? copy_signal+0x6b/0x39f
> [   18.539366]  [<ffffffff8101536c>] call_softirq+0x1c/0x30
> [   18.539366]  [<ffffffff8101752d>] do_softirq+0x51/0xae
> [   18.539366]  [<ffffffff81081a6d>] ? tick_handle_periodic+0x30/0x97
> [   18.539366]  [<ffffffff81061081>] irq_exit+0x52/0xaf
> [   18.539366]  [<ffffffff81030fff>] smp_apic_timer_interrupt+0x9b/0xc1
> [   18.539366]  [<ffffffff81014d53>] apic_timer_interrupt+0x13/0x20
> [   18.539366]  <EOI>  [<ffffffff810e5ac4>] ? kmem_cache_alloc+0x8b/0xcb
> [   18.539366]  [<ffffffff81058362>] ? copy_signal+0x6b/0x39f
> [   18.539366]  [<ffffffff811130eb>] ? copy_fs_struct+0xaf/0xd1
> [   18.539366]  [<ffffffff810597f2>] ? copy_process+0x580/0xd99
> [   18.539366]  [<ffffffff8105a174>] ? do_fork+0x169/0x33a
> [   18.539366]  [<ffffffff81457c69>] ? __up_read+0x8f/0xb0
> [   18.539366]  [<ffffffff81078f3a>] ? up_read+0x35/0x50
> [   18.539366]  [<ffffffff810af5bc>] ? perf_swcounter_event+0x30/0x46
> [   18.539366]  [<ffffffff8101264d>] ? sys_clone+0x37/0x52
> [   18.539366]  [<ffffffff810144f3>] ? stub_clone+0x13/0x20
> [   18.539366]  [<ffffffff81014182>] ? system_call_fastpath+0x16/0x1b
> [   18.539366] ---[ end trace 1d4adcfbc3df3215 ]---
> [   18.539366] Mapped at:
> [   18.539366]  [<ffffffff8146ceb0>] debug_dma_map_page+0x8b/0x1b9
> [   18.539366]  [<ffffffff816b0eb0>] nv_start_xmit_optimized+0x2a2/0x6c5
> [   18.539366]  [<ffffffff81a9503b>] dev_hard_start_xmit+0xd9/0x163
> [   18.539366]  [<ffffffff81ab0a12>] __qdisc_run+0xfc/0x223
> [   18.539366]  [<ffffffff81a95483>] dev_queue_xmit+0x284/0x3d4
> [   18.544082] ttyS0: 2 input overrun(s)
> [   18.639248] eth1: link down

This warning is not uncommon for the forcedeth driver. I got them
several times during testing. Havn't you got this warning with earlier
versions of dma-debug on this machine?

	Joerg

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