Message-ID: <4C84FFE0.7070507@redhat.com>
Date: Mon, 06 Sep 2010 16:51:12 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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To: cygwin@cygwin.com, Dave Cottlehuber <dave@muse.net.nz>,
        corinna-cygwin@cygwin.com
Subject: Re: Windows Server 2008 64-bit setup.exe/bash problem - Amazon Cloud
References: <AANLkTi=xgJzA5-pMz2mkg-b0CVf4PwFeYCy3RfA4NHgf@mail.gmail.com> <20100812114508.GA14202@calimero.vinschen.de>
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On 08/12/2010 01:45 PM, Corinna Vinschen wrote:
> >  http://dch.posterous.com/cygwin-dumps-core-on-windows-2008-r1sp2-on-ec
> > So, this muse-ing of yours is not correct.
>
> To me this implies that the Amazon Cloud VMs have some BLODA installed
> by default.  I'm not going to check this voluntarily.  I suggest that
> somebody who wants to run Cygwin on such a machine investigates this
> further, or just asks Amazon to fix this and hope for the best.

I'm not into Cygwin development enough to know what a BLODA is, but you 
may like to know the bug is in the Xen hypervisor used by Amazon.  I 
don't know exactly what releases or Xen are affected, but for sure all 
RHEL5 (and CentOS 5) hypervisors are.

The reason why you see it only on 64-bit Windows, is that the bug is 
about Xen mishandling the SWAPGS instruction which, well, is only 
present in 64-bit processors and in 64-bit mode.

https://bugzilla.redhat.com/show_bug.cgi?id=613187

Paolo

ps: KVM was also affected until last February.  I haven't checked if 
RHEL/CentOS KVM has the bug, but I'll ask fellow developers around about it.

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