cadence617器件多时仿真噪声报错FATAL (SPECTRE-20): Illegal instruction.

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Cadence 617运行仿真时，只要器件多到超过某个阈值，仿真设置勾选跟Noise相关的选项例如sp里面的 Do Noise，或者仿真pnoise,hbnoise都会报错，报错就只有
Internal error found in spectre at freq = 10 GHz during SP analysis `sp'.  
Encountered a critical error during simulation. Submit a Service Request via Cadence Online Support, including the netlist, the Spectre log file, the behavioral model files, and any other information that can help identify the problem.
    FATAL (SPECTRE-20): Illegal instruction.
这几行信息，要是只仿真单个管子或者几个小电路就没事，可以正常仿真。
是cadence软件问题呢还是系统的问题呢，cadence617软件和工艺库是从别的地方复制过来的，系统是centos7