On Mon, Feb 13, 2012 at 10:25:39AM +0100, Stanislaw Gruszka wrote:

On Fri, Feb 10, 2012 at 07:09:29PM +0100, Tomáš Janoušek wrote:

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On Sun, Nov 20, 2011 at 09:40:07PM +0100, Tomáš Janoušek wrote:

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Yes, I will try your configuration when I get back  to the office Monday

Did you have any luck?

I think I tried to reproduce that problem and failed, but honestly I do
not remember right now ...

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I just found out something which is almost completely
insane.

For the last few months, I've happily used a 64-bit kernel and have had no
problems whatsoever. About a week ago, I started using virtual machines in
KVM. And today I found that I have exactly the same problem, but only _inside_
the virtual machine. I can't reliably scp a file from the internet to my
virtual machine. It works fine when I scp to the host, it works fine when I'm
on a WPA-PSK network. And it happens even if I tell kvm to emulate e1000, not
only with virtio-net. How strange is that?

And while this is happening, the host is running just fine. The host has a
64-bit kernel with a 32-bit userspace, so if something was wrong with the
32-bit mode of my processor, it would've appeared on the host as well, no?

It's also worth mentioning that if I build openssl with "no-asm 386", scp
works just fine. So it doesn't look like a memory corruption after all. It
seems as if certain CPU instructions didn't work properly if running on a
32-bit kernel with a WiFi adapter doing something. But how can it be
that those same CPU instructions work on a 64-bit host with 32-bit userspace?
At the same time! That's just completely insane, and I can't think of an
explanation. Shall I get a new CPU perhaps? :-)

Currently there are discussion about compilator problems that
can result a corruption
http://lwn.net/Articles/478657/
Perhaps this problem is something similar.

Also, if you look at lspci -vt, does it show that corruption happen
only  when PCI bridge is used (however that would not explain why it
only happens with WPA enterprise).

I also found this bug report
https://bugzilla.kernel.org/show_bug.cgi?id=37742
where one user report iwlwifi corruption catched by IOMMU.

Tomáš, I do not remember, do you have the same problems on
older kernels i.e < 3.0

Stanislaw