[Bug 68171] [IVB/HSW ULT]system hang when run nightly testing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68171

--- Comment #6 from Ben Widawsky <ben at bwidawsk.net> ---
I dug a bit. It looks to me the failure is that pages is null here:

if (!obj->has_dma_mapping)
        dma_unmap_sg(&dev->pdev->dev,
                     obj->pages->sgl, obj->pages->nents,
                     PCI_DMA_BIDIRECTIONAL);


My disasm is a bit too complex to make sense out of at this hour.

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