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: > > 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). 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 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
