Re: [Qemu-devel] [Bug 1706296] Re: Booting NT 4 disk causes /home/rjones/d/qemu/cpus.c:1580:qemu_mutex_lock_iothread: assertion failed: (!qemu_mutex_iothread_locked())

[Peter Maydell]

On 18 August 2017 at 09:40, Alex Bennée <address@hidden> wrote:
>
> John Arbuckle <address@hidden> writes:
>
>> Using '-cpu 486' gets past the assertion error. I guess Windows NT 4.0
>> is not compatible with newer Intel processors.
>
> It might be related. The assertion error is caused by the fact an
> exception has occurred and processor is trying to dump a stack frame that
> overlaps from RAM into device memory. As the IRQ/exception handling is
> already under the BQL (as it changes machine state) we get the assertion
> when it tries to take the BQL a second time when accessing device
> memory.

This sounds worrying -- lots and lots of target backend code
does writes to memory. Is it all going to cause assertions if
it happens to be pointing at a device?

thanks
-- PMM