KVM VM(windows xp) reseted when running geekbench for about 2 days

[Zhanghaoyu (A)]

I start 10 VMs(windows xp), then running geekbench tool on them, about 2 days, one of them was reset,
I found the reset operation is done by
int kvm_cpu_exec(CPUArchState *env)
{
    ...
       switch (run->exit_reason)
       ...
        case KVM_EXIT_SHUTDOWN:
            DPRINTF("shutdown\n");
            qemu_system_reset_request();
            ret = EXCP_INTERRUPT;
            break;
    ...
}

KVM_EXIT_SHUTDOWN exit reason was set previously in triple fault handle handle_triple_fault().

What causes the triple fault?

Thanks,
Zhang Haoyu
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