milkv-duo segment fault in proxylessnasnet F0_expand

[HuPengsheet]

nihui，您好！

我将ncnn移植在milkv-duo上，在运行benchncnn时，发现在proxylessnasnet出现了segment fault错误。

我把运行的算子打印出来了，确定是F0_expand这个layer报错

[root@milkv-duo]/home/github/benchmark# ../bin/benchncnn 
syscall error -1
loop_count = 4
num_threads = 1
powersave = 0
gpu_device = -1
cooling_down = 1
A0_linear
B0_expand
B0_linear
B1_linear
C0_expand
C0_linear
C1_linear
C2_linear
C3_linear
D0_expand
D0_linear
D1_linear
D2_linear
D3_linear
E0_expand
E0_linear
E1_linear
E2_linear
E3_linear
F0_expand
Segmentation fault

然后我使用GDB进行调试，定位到错误代码为convolution_sgemm_packn.h 的convolution_sgemm_packn函数

for (int j = 0; j < nn; j++)
{
    float val0 = *tmpptr++;
    float val1 = *tmpptr++;
    float val2 = *tmpptr++;
    float val3 = *tmpptr++;
    float val4 = *tmpptr++;
    float val5 = *tmpptr++;
    float val6 = *tmpptr++;
    float val7 = *tmpptr++;

    //出现段错误的代码，为下面这一行
    vfloat32m1_t _w0 = vle32_v_f32m1(kptr0, vl);
    
    _sum0 = vfmacc_vf_f32m1(_sum0, val0, _w0, vl);
    _sum1 = vfmacc_vf_f32m1(_sum1, val1, _w0, vl);
    _sum2 = vfmacc_vf_f32m1(_sum2, val2, _w0, vl);
    _sum3 = vfmacc_vf_f32m1(_sum3, val3, _w0, vl);
    _sum4 = vfmacc_vf_f32m1(_sum4, val4, _w0, vl);
    _sum5 = vfmacc_vf_f32m1(_sum5, val5, _w0, vl);
    _sum6 = vfmacc_vf_f32m1(_sum6, val6, _w0, vl);
    _sum7 = vfmacc_vf_f32m1(_sum7, val7, _w0, vl);

    kptr0 += packn;
}

本来想自己解决，但弄了好久也没弄出结果。