Re: [Xen-devel] kernel BUG at nvme/host/pci.c

[Andreas Pflug <pgadmin@xxxxxxxxxxxxxxxxx>]

Am 15.07.17 um 10:51 schrieb Christoph Hellwig:
> On Fri, Jul 14, 2017 at 01:08:47PM -0400, Keith Busch wrote:
>>> So LVM2 backed by md raid1 isn't compatible with newer hardware... Any
>>> suggestions?
>> It's not that LVM2 or RAID isn't compatible. Either the IOMMU isn't
>> compatible if can use different page offsets for DMA addresses than the
>> physical aaddresses, or the driver for it is broken. The DMA addresses
>> in this mapped SGL look completely broken, at least, since the last 4
>> entries are all the same address. That'll corrupt data.
> Given that this is a Xen system I wonder if swiotlb-xen is involved
> here, which does some odd chunking of dma translations?

I did some more testing now.

With data stored on SATA disks with md1 and lvm2 (i.e. just replacing
NVME by SATA), there's nothing happening.
With data stored on /dev/nvme1n1p1, i.e. without any device mapping
stuff, I get the same problem.
Log attached.

Regards,
Andreas

Attachment: x.log
Description: Text document

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