lkml.org 
[lkml]   [2012]   [Feb]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: iwlagn: memory corruption with WPA enterprise
On Fri, Feb 10, 2012 at 07:09:29PM +0100, Tomáš Janoušek wrote:
> On Sun, Nov 20, 2011 at 09:40:07PM +0100, Tomáš Janoušek wrote:
> > > 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 ...

> 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).

Stanislaw
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2012-02-13 10:29    [W:3.184 / U:0.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site