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Subjecte1000e 0000:04:00.0: DMA-API: device driver frees DMA memory with wrong function [device address=0x000000003e5a2c02] [size=42 bytes] [mapped as single] [unmapped as page]

another -tip testbox triggered a DMA-debug warning on e1000e:

[ 33.284944] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
[ 34.129676] ------------[ cut here ]------------
[ 34.132025] WARNING: at lib/dma-debug.c:562 check_unmap+0x364/0x800()
[ 34.132025] Hardware name:
[ 34.132025]
e1000e 0000:04:00.0: DMA-API: device driver frees
DMA memory with wrong function [device address=0x000000003e5a2c02]
[size=42 bytes] [mapped as single] [unmapped as page]
[ 34.132025] Modules linked in:
[ 34.132025] Pid: 1937, comm: arping Not tainted 2.6.29-rc8-tip-02728-g7db4920-dirty #2993
[ 34.132025] Call Trace:
[ 34.132025] <IRQ> [<ffffffff80281f3d>] warn_slowpath+0xfd/0x140
[ 34.132025] [<ffffffff80c12976>] ? fn_hash_lookup+0x16/0x100
[ 34.132025] [<ffffffff80bc3e65>] ? ip_route_input_slow+0x635/0x820
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff8067ef04>] check_unmap+0x364/0x800
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff8067f6d8>] debug_dma_unmap_page+0xd8/0xe0
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff807758b5>] e1000_put_txbuf+0xd5/0x170
[ 34.132025] [<ffffffff80775a53>] e1000_clean_tx_irq+0x103/0x350
[ 34.132025] [<ffffffff8077b668>] e1000_clean+0x148/0x1a0
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff80b570ab>] net_rx_action+0x2bb/0x340
[ 34.132025] [<ffffffff8028a433>] __do_softirq+0xf3/0x2b0
[ 34.132025] [<ffffffff802329fa>] call_softirq+0x1a/0x50
[ 34.132025] [<ffffffff80234ca9>] do_softirq+0xd9/0x1c0
[ 34.132025] [<ffffffff8028a333>] irq_exit+0xc3/0xd0
[ 34.132025] [<ffffffff80cf6a65>] do_IRQ+0x75/0x110
[ 34.132025] [<ffffffff80232393>] ret_from_intr+0x0/0x15
[ 34.132025] <EOI> [<ffffffff80231622>] ? ftrace_caller+0x12/0x41
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff80337d96>] ? free_page_and_swap_cache+0x16/0x80
[ 34.132025] [<ffffffff8032439f>] ? zap_pte_range+0x41f/0x580
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff80231656>] ? ftrace_call+0x5/0x2b
[ 34.132025] [<ffffffff803248c8>] ? unmap_page_range+0x3c8/0x3d0
[ 34.132025] [<ffffffff80324b9f>] ? unmap_vmas+0x2cf/0x390
[ 34.132025] [<ffffffff8032b2e0>] ? exit_mmap+0x130/0x1f0
[ 34.132025] [<ffffffff8027f628>] ? mmput+0x48/0x110
[ 34.132025] [<ffffffff8028542f>] ? exit_mm+0x14f/0x160
[ 34.132025] [<ffffffff80287a6a>] ? do_exit+0x24a/0x4d0
[ 34.132025] [<ffffffff80287d64>] ? do_group_exit+0x74/0x110
[ 34.132025] [<ffffffff80287e17>] ? sys_exit_group+0x17/0x20
[ 34.132025] [<ffffffff8023196f>] ? system_call_fastpath+0x16/0x1b
[ 34.132025] ---[ end trace dd8d48ce9f465553 ]---
[ 34.132025] Mapped at:
[ 34.132025] [<ffffffff8067fa37>] debug_dma_map_page+0x107/0x2a0
[ 34.132025] [<ffffffff8077711b>] e1000_tx_map+0x29b/0x870
[ 34.132025] [<ffffffff8077aa65>] e1000_xmit_frame+0x355/0x500
[ 34.132025] [<ffffffff80b54018>] dev_hard_start_xmit+0xb8/0x270
[ 34.132025] [<ffffffff80b775b0>] __qdisc_run+0x380/0x3b0
[ 35.650726] ------------[ cut here ]------------
Ingo


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