szha commented on issue #18942:
URL:
https://github.com/apache/incubator-mxnet/issues/18942#issuecomment-678078797
So here's the problem:
```
% DMLC_LOG_STACK_TRACE_DEPTH=150 MXNET_ENGINE_TYPE=NaiveEngine lldb
python3.7 -- test_18942.py
(lldb) target create "python3.7"
Current executable set to 'python3.7' (x86_64).
(lldb) settings set -- target.run-args "test_18942.py"
(lldb) run
Process 82919 launched: '/usr/local/bin/python3.7' (x86_64)
Process 82919 stopped
* thread #2, stop reason = exec
frame #0: 0x0000000100006000 dyld`_dyld_start
dyld`_dyld_start:
-> 0x100006000 <+0>: popq %rdi
0x100006001 <+1>: pushq $0x0
0x100006003 <+3>: movq %rsp, %rbp
0x100006006 <+6>: andq $-0x10, %rsp
(lldb) cont
Process 82919 resuming
[23:55:46] ../src/engine/engine.cc:55: MXNet start using engine: NaiveEngine
[23:55:46] ../src/storage/storage.cc:198: Using Pooled (Naive)
StorageManager for CPU
Process 82919 stopped
* thread #2, queue = 'com.apple.main-thread', stop reason = EXC_ARITHMETIC
(code=EXC_I386_DIV, subcode=0x0)
frame #0: 0x0000000112b06279
libmxnet.dylib`mxnet::op::CorrelationProp::InferShape(this=0x000000010056ffa0,
in_shape=0x00007ffeefbfc1d0, out_shape=0x00000001005baeb0,
aux_shape=0x00007ffeefbfc1b0) const at correlation-inl.h:219
216 / static_cast<float>(stride1));
217 top_height_ =
std::ceil(static_cast<float>(paddedbottomheight - border_size_ * 2)\
218 / static_cast<float>(stride1));
-> 219 neighborhood_grid_radius_ = param_.max_displacement /
stride2;
220 neighborhood_grid_width_ = neighborhood_grid_radius_ * 2 +
1;
221 top_channels_ = neighborhood_grid_width_ *
neighborhood_grid_width_;
222 CHECK_GE(top_width_, 1U) <<
```
https://github.com/apache/incubator-mxnet/blob/9bdd4d6347c284770ee5bfe5ae98f1dabc283829/src/operator/correlation-inl.h#L219
The code needs to guard against zero-size array for right operand of `/`,
and we should add a smoke test to guard against such problem in this op,
similar to https://github.com/apache/incubator-mxnet/pull/18972/files
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