netdev - Re: Any ideas about a crash on reboot with igb and intel

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Message-ID: <adahbnt7mfk.fsf@roland-alpha.cisco.com>
Date:	Fri, 02 Apr 2010 11:13:03 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	netdev@...r.kernel.org
Cc:	iommu@...ts.linux-foundation.org,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: Any ideas about a crash on reboot with igb and intel_iommu?

So actually I found the following change that went into 2.6.31:

    commit 91615f765a2935b6cbae424b9eee1585ed681ae6
    Author: Jesse Brandeburg <jesse.brandeburg@...el.com>
    Date:   Tue Jun 30 12:45:15 2009 +0000

        igb: fix unmap length bug

        driver was mixing NET_IP_ALIGN count bytes in map/unmap calls
        unevenly. Only map the bytes that the hardware might dma into

igb in 2.6.30.y is doing pci_map_single(<some length>) and doing
pci_unmap_single(<some other length>).

However I haven't been able to provoke the crash yet, even by bouncing
an igb interface (with VT-d turned on and with CONFIG_DMAR_DEFAULT_ON enabled).
Does this make sense as the sort of thing that might corrupt the iova
rbtree and lead to a crash in the __free_iova / rb_erase code?

Thanks,
  Roland
-- 
Roland Dreier <rolandd@...co.com> || For corporate legal information go to:
http://www.cisco.com/web/about/doing_business/legal/cri/index.html
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