szha commented on issue #18936:
URL:
https://github.com/apache/incubator-mxnet/issues/18936#issuecomment-678062954
So here's the problem:
```
% DMLC_LOG_STACK_TRACE_DEPTH=150 MXNET_ENGINE_TYPE=NaiveEngine lldb
python3.7 -- test_18936.py
(lldb) target create "python3.7"
Current executable set to 'python3.7' (x86_64).
(lldb) settings set -- target.run-args "test_18936.py"
(lldb) run
Process 27100 launched: '/usr/local/bin/python3.7' (x86_64)
Process 27100 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 27100 resuming
[23:14:55] ../src/engine/engine.cc:55: MXNet start using engine: NaiveEngine
[23:14:55] ../src/storage/storage.cc:198: Using Pooled (Naive)
StorageManager for CPU
Process 27100 stopped
* thread #2, queue = 'com.apple.main-thread', stop reason = EXC_ARITHMETIC
(code=EXC_I386_DIV, subcode=0x0)
frame #0: 0x0000000116f5b318 libmxnet.dylib`void
mxnet::op::mxnet_op::Kernel<mxnet::op::LaunchExWrapper<mxnet::op::PDF_Dirichlet<false>
>, mshadow::cpu>::LaunchEx<int, int, float*, float*,
float*>(mshadow::Stream<mshadow::cpu>*, unsigned long, int, int, float*,
float*, float*) at pdf_op.h:443
440 index_t i = start;
441
442 // Get aligned
-> 443 const index_t align_step = sample_size - (i % sample_size);
444 const index_t first_stride = length > align_step ?
align_step : length;
445 OP::Map(i, first_stride, sample_size, args...);
446 i += first_stride;
```
https://github.com/apache/incubator-mxnet/blob/9bdd4d6347c284770ee5bfe5ae98f1dabc283829/src/operator/random/pdf_op.h#L443
The code needs to guard against zero-size array, 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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