Release build with clang++12 failed some tests

[sjwsl]

Describe the bug
Some tests failed after building taichi in release mode with clang++12.

To Reproduce
Set CMAKE_CXX_COMPILER to clang++12

$ git clone https://taichi-dev/taichi
$ cd taichi
$ git submodule update --init --recursive
$ python3 setup.py develop --user
$ ti test -vfr2 -t2 -k "not ndarray and not torch" 

========================================= FAILURES =========================================
__________________________ python/taichi/tests/test_bitmasked.py ___________________________
[gw3] linux -- Python 3.8.10 /usr/bin/python3
worker 'gw3' crashed while running 'python/taichi/tests/test_bitmasked.py::test_basic'
__________________________ python/taichi/tests/test_bitmasked.py ___________________________
[gw6] linux -- Python 3.8.10 /usr/bin/python3
worker 'gw6' crashed while running 'python/taichi/tests/test_bitmasked.py::test_basic_packed'
________________________ python/taichi/tests/test_sparse_basics.py _________________________
[gw9] linux -- Python 3.8.10 /usr/bin/python3
worker 'gw9' crashed while running 'python/taichi/tests/test_sparse_basics.py::test_pointer_is_active'
===================================== warnings summary =====================================
../../.local/lib/python3.8/site-packages/autograd/numpy/numpy_wrapper.py:20: 40 warnings
  /home/taichigraphics/.local/lib/python3.8/site-packages/autograd/numpy/numpy_wrapper.py:20: DeprecationWarning: `np.int` is a deprecated alias for the builtin `int`. To silence this warning, use `int` by itself. Doing this will not modify any behavior and is safe. When replacing `np.int`, you may wish to use e.g. `np.int64` or `np.int32` to specify the precision. If you wish to review your current use, check the release note link for additional information.
  Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
    int_types = {_np.int, _np.int8, _np.int16, _np.int32, _np.int64, _np.integer}

-- Docs: https://docs.pytest.org/en/stable/warnings.html
======================== xdist: maximum crashed workers reached: 8 =========================
================================= short test summary info ==================================
FAILED python/taichi/tests/test_bitmasked.py::test_basic
FAILED python/taichi/tests/test_bitmasked.py::test_basic_packed
FAILED python/taichi/tests/test_sparse_basics.py::test_pointer_is_active
============= 3 failed, 818 passed, 40 warnings, 6 rerun in 1322.51s (0:22:02) =============
>>> Running time: 1322.65s

Also here is a minimal program to reproduce one of the failures which is subtracted from the tests

import taichi as ti

ti.init(arch=ti.cuda)

x = ti.field(ti.i32)
c = ti.field(ti.i32)

bm = ti.root.bitmasked(ti.ij, (3, 6)).bitmasked(ti.i, 5)
bm.place(x)
ti.root.place(c)

@ti.kernel
def sum():
    for i, j in x:
        c[None] += ti.is_active(bm, [i, j])

sum()

[Taichi] version 0.8.4, llvm 10.0.1, commit 3022cf53, linux, python 3.8.10
[Taichi] Starting on arch=cuda
[E 10/29/21 23:57:58.734 816473] Received signal 11 (Segmentation fault)


***********************************
* Taichi Compiler Stack Traceback *
***********************************
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::Logger::error(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so(+0x6151de) [0x7fd0358511de]
/lib/x86_64-linux-gnu/libc.so.6(+0x46210) [0x7fd039ce3210]
/lib/x86_64-linux-gnu/libstdc++.so.6: __dynamic_cast
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so(+0x672849) [0x7fd0358ae849]
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::StmtSearcher::visit(taichi::lang::Stmt*)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::BasicStmtVisitor::visit(taichi::lang::Block*)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::OffloadedStmt::all_blocks_accept(taichi::lang::IRVisitor*)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::StmtSearcher::run(taichi::lang::IRNode*, std::function<bool (taichi::lang::Stmt*)> const&)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::irpass::analysis::gather_statements(taichi::lang::IRNode*, std::function<bool (taichi::lang::Stmt*)> const&)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so(+0x670e55) [0x7fd0358ace55]
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::irpass::make_thread_local(taichi::lang::IRNode*, taichi::lang::CompileConfig const&)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::irpass::offload_to_executable(taichi::lang::IRNode*, taichi::lang::CompileConfig const&, taichi::lang::Kernel*, bool, bool, bool, bool, bool)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::irpass::compile_to_executable(taichi::lang::IRNode*, taichi::lang::CompileConfig const&, taichi::lang::Kernel*, bool, bool, bool, bool, bool, bool, bool, bool)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::Kernel::lower(bool)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::LlvmProgramImpl::compile(taichi::lang::Kernel*, taichi::lang::OffloadedStmt*)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::Program::compile(taichi::lang::Kernel&, taichi::lang::OffloadedStmt*)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::Kernel::compile()
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so: taichi::lang::Kernel::operator()(taichi::lang::Kernel::LaunchContextBuilder&)
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so(+0x36eeea) [0x7fd0355aaeea]
/home/taichigraphics/Documents/taichi/python/taichi/lib/taichi_core.so(+0x355b47) [0x7fd035591b47]
python3(PyCFunction_Call+0x59) [0x5f5db9]
python3(_PyObject_MakeTpCall+0x29e) [0x5f698e]
python3() [0x50b485]
python3(PyObject_Call+0x1f7) [0x5f56c7]
python3() [0x59cb20]
python3(_PyObject_MakeTpCall+0x29e) [0x5f698e]
python3(_PyEval_EvalFrameDefault+0x59bc) [0x57107c]
python3(_PyEval_EvalCodeWithName+0x26a) [0x56a0ba]
python3(_PyFunction_Vectorcall+0x393) [0x5f6343]
python3(PyObject_Call+0x1f7) [0x5f56c7]
python3(_PyEval_EvalFrameDefault+0x1f36) [0x56d5f6]
python3(_PyEval_EvalCodeWithName+0x26a) [0x56a0ba]
python3(_PyFunction_Vectorcall+0x393) [0x5f6343]
python3(_PyObject_FastCallDict+0x327) [0x5f70f7]
python3(_PyObject_Call_Prepend+0x61) [0x5f50c1]
python3() [0x59cafb]
python3(PyObject_Call+0x27e) [0x5f574e]
python3(_PyEval_EvalFrameDefault+0x1f36) [0x56d5f6]
python3(_PyEval_EvalCodeWithName+0x26a) [0x56a0ba]
python3(_PyFunction_Vectorcall+0x393) [0x5f6343]
python3(_PyEval_EvalFrameDefault+0x71d) [0x56bddd]
python3(_PyEval_EvalCodeWithName+0x26a) [0x56a0ba]
python3(PyEval_EvalCode+0x27) [0x68d5b7]
python3() [0x67cd01]
python3() [0x67cd7f]
python3() [0x67ce21]
python3(PyRun_SimpleFileExFlags+0x197) [0x67ef47]
python3(Py_RunMain+0x212) [0x6b7242]
python3(Py_BytesMain+0x2d) [0x6b75cd]
/lib/x86_64-linux-gnu/libc.so.6: __libc_start_main
python3(_start+0x2e) [0x5fb18e]

Internal error occurred. Check out this page for possible solutions:
https://docs.taichi.graphics/lang/articles/misc/install

[qiao-bo]

i can also reproduce this in a docker container. I installed clang-12 via apt, did you build from source?

[sjwsl]

i can also reproduce this in a docker container. I installed clang-12 via apt, did you build from source?

Yup.