Additional info:
WARNING: at lib/dma-debug.c:933 check_unmap+0x47b/0x960()
Hardware name: Bochs
8139cp 0000:00:03.0: DMA-API: device driver failed to check map error[device address=0x000000003ff92522] [size=90 bytes] [mapped as single]
Modules linked in: ebtable_filter ebtables ip6table_filter ip6_tables joydev snd_intel8x0 snd_ac97_codec ac97_bus snd_seq snd_seq_device snd_pcm 8139too snd_page_alloc snd_timer snd 8139cp soundcore i2c_piix4 mii microcode uinput isofs squashfs qxl crc32c_intel drm_kms_helper ttm virtio_balloon drm i2c_core
Pid: 743, comm: ip6tables Not tainted 3.9.0-0.rc3.git0.4.fc19.x86_64 #1
Call Trace:
 <IRQ>  [<ffffffff81068df0>] warn_slowpath_common+0x70/0xa0
 [<ffffffff81068e6c>] warn_slowpath_fmt+0x4c/0x50
 [<ffffffff8137ec1b>] check_unmap+0x47b/0x960
 [<ffffffff8137f15f>] debug_dma_unmap_page+0x5f/0x70
 [<ffffffffa01e8bd0>] cp_interrupt+0x2f0/0x5b0 [8139cp]
 [<ffffffff811193b6>] handle_irq_event_percpu+0x56/0x390
 [<ffffffff8111972d>] handle_irq_event+0x3d/0x60
 [<ffffffff8111c8ea>] handle_fasteoi_irq+0x5a/0x100
 [<ffffffff8101c36f>] handle_irq+0xbf/0x150
 [<ffffffff81073800>] ? irq_enter+0x50/0xa0
 [<ffffffff8172870d>] do_IRQ+0x4d/0xc0
 [<ffffffff8171da32>] common_interrupt+0x72/0x72
 [<ffffffff810733e8>] ? __do_softirq+0xa8/0x400
 [<ffffffff810733e1>] ? __do_softirq+0xa1/0x400
 [<ffffffff810acde8>] ? sched_clock_cpu+0xa8/0x100
 [<ffffffff81073905>] irq_exit+0xb5/0xc0
 [<ffffffff817287ee>] smp_apic_timer_interrupt+0x6e/0x9c
 [<ffffffff817276b2>] apic_timer_interrupt+0x72/0x80
 <EOI>  [<ffffffff813659e5>] ? copy_page_rep+0x5/0x10
 [<ffffffff8118e87f>] ? __do_fault+0x3af/0x560
 [<ffffffff81021d69>] ? sched_clock+0x9/0x10
 [<ffffffff810acc5d>] ? sched_clock_local+0x1d/0x80
 [<ffffffff81191756>] handle_pte_fault+0x96/0x970
 [<ffffffff81192df5>] handle_mm_fault+0x2a5/0x5c0
 [<ffffffff81721872>] __do_page_fault+0x172/0x5a0
 [<ffffffff8109a33f>] ? up_write+0x1f/0x40
 [<ffffffff81183ccc>] ? vm_mmap_pgoff+0x9c/0xc0
 [<ffffffff81726a45>] ? sysret_check+0x22/0x5d
 [<ffffffff8136745d>] ? trace_hardirqs_off_thunk+0x3a/0x3c
 [<ffffffff81721cae>] do_page_fault+0xe/0x10
 [<ffffffff8172133a>] do_async_page_fault+0x2a/0xa0
 [<ffffffff8171ddf8>] async_page_fault+0x28/0x30