Re: [Xen-devel] USB disk corruption on Xen 4.1.0 & Linux 2.6.38.7

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, May 31, 2011 at 01:07:49PM +0100, Anthony Wright wrote:
> I build Xen 4.1.0 and linux 2.6.38.7 from source to do a DIY system based on 
> Linux From Scratch (LFS).

Ok.. Had you tried my #devel/next-2.6.38 branch in the past?

> 
> When I try to read from a USB memory stick (around 64M big), I get corruption 
> on the latest version of Xen.

So this is from dom0 kernel, right?

> 
> With Xen 3.x and linux 2.6.18 I can read the memory stick no problems.
> 
> If I use the linux 2.6.38.7 kernel without a Xen hypervisor I can read the 
> memory stick without problems.
> 
> If I use the same setup, but this time introduce the Xen 4.1.0 hypervisor I 
> get random blocks of sectors on the USB disk returning all zeros. Normally 
> these blocks change each time I reboot, but are fixed once they've been 
> established. On one occasion the blocks changed continuously each time I 
> looked at the disk (I have a big file on the USB disk and I run md5sum before 
> accessing it).

What is the filesystem on the USB disk?
> 
> Just to remove other possibilities I've checked the system's RAM and it's 
> fine (I've seen similar problems before with dodgy RAM). If I try to access a 
> hard disk or CDROM, everything is fine.
> 
> This could be a problem with the way I've built the kernel or Xen, but it 
> seems to suggest that there's a bug in Xen.
> 
> I'm happy to try to isolate the problem further if it can't be reproduced 
> elsewhere. My first suggestion would be to use a known good binary copy of 
> xen 4.1.0 and/or linux 2.6.38.7 if anybody can supply one.

<sigh>Please provide serial log or dmesg output.
> 
> thanks,
> 
> Anthony Wright
> 
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