Sorry, the last email did not specify this information. 
I gave VM1 all the hardware resources, and it used eight cores. VM2 only has uart resources (also timer, gic resources), using a single core. I tried to give both VM1 and VM2 only the necessary hardware resources( uart, timer, gic), and that error won't happen.

On 4/9/2018 06:28Adam Lackorzynski<> wrote:
Hi Nico,

On Fri Mar 30, 2018 at 10:15:33 +0800, nico wrote:
Hi Adam, I'm using an eight-core Cortex-A53 processor. The vm is
running 64bit Linux. It is recommended to start two or three vms, that
will be easier to reproduce this problem.

So, I tried several things but cannot reproduce this issue. I assume
this are single-core VMs only? Any hardware passed through?
Just trying to narrow it down...
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