Received signal 11 when running sample code in gpu

I got an error when trying to run the sample code with gpu. This code can run normally on the CPU, but I still want to run successfully on GPU.

Here is the code.

# fractal.py

import taichi as ti

ti.init(arch=ti.gpu)

n = 320
pixels = ti.var(dt=ti.f32, shape=(n * 2, n))

@ti.func
def complex_sqr(z):
  return ti.Vector([z[0] ** 2 - z[1] ** 2, z[1] * z[0] * 2])

@ti.kernel
def paint(t: ti.f32):
  for i, j in pixels: # 对于所有像素,并行执行
    c = ti.Vector([-0.8, ti.sin(t) * 0.2])
    z = ti.Vector([float(i) / n - 1, float(j) / n - 0.5]) * 2
    iterations = 0
    while z.norm() < 20 and iterations < 50:
      z = complex_sqr(z) + c
      iterations += 1
    pixels[i, j] = 1 - iterations * 0.02

gui = ti.GUI("Fractal", (n * 2, n))

for i in range(1000000):
  paint(i * 0.03)
  gui.set_image(pixels)
  gui.show()

This is the command line output

[Taichi] mode=release
[Taichi] version 0.6.8, supported archs: [cpu, cuda, opengl], commit 9f4fd27c, python 3.7.6
[W 06/09/20 19:10:10.887] [cuda_driver.h:call_with_warning@62] CUDA Error CUDA_ERROR_INVALID_DEVICE: invalid device ordinal while calling mem_advise (cuMemAdvise)
[E 06/09/20 19:10:11.203] Received signal 7 (Bus error)


***********************************
* Taichi Compiler Stack Traceback *
***********************************
/home/argentea/anaconda3/lib/python3.7/site-packages/taichi/core/../lib/taichi_core.so: taichi::Logger::error(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool)
/home/argentea/anaconda3/lib/python3.7/site-packages/taichi/core/../lib/taichi_core.so: taichi::signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7fc954456f20]
/home/argentea/anaconda3/lib/python3.7/site-packages/taichi/core/../lib/taichi_core.so: taichi::lang::MemoryPool::daemon()
/home/argentea/anaconda3/bin/../lib/libstdc++.so.6(+0xc819d) [0x7fc9428da19d]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x76db) [0x7fc9548106db]
/lib/x86_64-linux-gnu/libc.so.6: clone

Internal Error occurred, check this page for possible solutions:
https://taichi.readthedocs.io/en/stable/install.html#troubleshooting
[E 06/09/20 19:10:11.204] Received signal 11 (Segmentation fault)

Have you tried https://taichi.readthedocs.io/en/stable/install.html#cuda-issues ?

Fixed and Thanks. I remembered the order of the architecture incorrectly.