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From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 16 Feb 2012 12:01:58 +0100
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Subject: Re: [Qemu-devel] [Bug 932487] [NEW] win32: git rev 59f971d crashes
 when accessing disk (coroutine issue)
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To: qemu-devel@nongnu.org

On 02/16/2012 11:34 AM, Kevin Wolf wrote:
> Remember that I saw a similar crash a while ago? It was definitely a
> NULL pointer access somewhere inside SwitchToFiber. I can't remember
> exactly what came out of it, but I think you and Paolo couldn't
> reproduce it and I ran out of time for debugging win32 stuff.
> 
> If I was to debug this, the first thing I would try is that I would dump
> co->fiber (or actually I seem to remember it was some data structure
> that is only pointed to by a field in co->fiber) immediately after the
> coroutine is created (I think it was still okay then) and set a
> watchpoint on it.

IIRC the problem was that thread-local storage was not thread-local at all.

Paolo