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Date: Mon, 31 Mar 2003 15:58:48 -0800 (PST)
From: Wayne Whitney <whitney@math.berkeley.edu>
Reply-To: whitney@math.berkeley.edu
To: Linus Torvalds <torvalds@transmeta.com>
cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] 2.5.65: Caching MSR_IA32_SYSENTER_CS kills dosemu
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On Mon, 31 Mar 2003, Linus Torvalds wrote:

> On Mon, 31 Mar 2003, Wayne Whitney wrote:
> >
> > I run dosemu 1.0.2.1 on the 2.5.x kernels.  Upgrading from 2.5.64 to
> > 2.5.65 (or 2.5.66) causes dosemu to no longer work:  it locks up the
> > machine shortly after I run it.
> 
> There appears to be at least one bug (that is longstanding but might be 
> made worse by the MSR stuff). However, that one should matter only with 
> preemption enabled. What's your configuration?

UP with preempt.  2.5.66 with the patch you sent still locks up.  I should
mention that I am running two copies of a hacked XFree86 on two different
sets of KVM hardware, but that doesn't require any kernel patches (well, a
small one to the input layer).

> Also, do you actually have a new library that uses SYSENTER (ie recent 
> redhat beta), and whct kind of CPU do you have?

Well, I have glibc-2.3.1-51, from RedHat Rawhide February 20, so it sounds
like that uses SYSENTER.  The CPU is an Althon XP, stepping 6-6-2.

Cheers, Wayne


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