szha commented on issue #18937:
URL:
https://github.com/apache/incubator-mxnet/issues/18937#issuecomment-678065471
Here's the problem:
```
% DMLC_LOG_STACK_TRACE_DEPTH=150 MXNET_ENGINE_TYPE=NaiveEngine lldb
python3.7 -- test_18937.py
(lldb) target create "python3.7"
Current executable set to 'python3.7' (x86_64).
(lldb) settings set -- target.run-args "test_18937.py"
(lldb) run
Process 36591 launched: '/usr/local/bin/python3.7' (x86_64)
Process 36591 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 36591 resuming
[23:22:22] ../src/engine/engine.cc:55: MXNet start using engine: NaiveEngine
[23:22:22] ../src/storage/storage.cc:198: Using Pooled (Naive)
StorageManager for CPU
Process 36591 stopped
* thread #2, queue = 'com.apple.main-thread', stop reason = EXC_ARITHMETIC
(code=EXC_I386_DIV, subcode=0x0)
frame #0: 0x0000000115bca540
libmxnet.dylib`mxnet::op::PdfCaller<mshadow::cpu, float,
mxnet::op::PDF_Poisson<false>, 1, false>::op(inputs=0x00007ffeefbfcb50,
outputs=0x00007ffeefbfcb30, s=0x00000001272d39c9) at pdf_op.h:469
466 static void op(const std::vector<TBlob>& inputs,
467 const std::vector<TBlob>& outputs,
468 mshadow::Stream<xpu> *s) {
-> 469 CHECK_EQ(inputs[0].Size()%inputs[1].Size(), 0);
470 CHECK_EQ(inputs[0].Size()%outputs[0].Size(), 0);
471 index_t num_samples(inputs[0].Size() / inputs[1].Size());
472 mxnet_op::Kernel<LaunchExWrapper<pdf>, xpu>::LaunchEx(s,
outputs[0].Size(), num_samples,
```
https://github.com/apache/incubator-mxnet/blob/9bdd4d6347c284770ee5bfe5ae98f1dabc283829/src/operator/random/pdf_op.h#L469
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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