test_numpy_op.py:test_np_unary_bool_funcs hangs

[nickguletskii]

Description

It seems that test_np_unary_bool_funcs:test_np_unary_bool_funcs hangs in CI for hours, then the job gets aborted. At least, I think it's test_np_unary_bool_funcs, because test_np_true_divide usually comes before and no output for test_np_unary_bool_funcs is displayed in the logs when the test suite becomes unresponsive.

Occurrences

1. http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/mxnet-validation%2Funix-gpu/detail/PR-18142/1/pipeline/431 (Python3: GPU TVM_OP OFF)
2. http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/mxnet-validation%2Funix-gpu/detail/PR-17177/9/pipeline/417 (Python3: GPU)
3. http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/mxnet-validation%2Funix-gpu/detail/PR-17177/12/pipeline/431 (Python3: GPU TVM_OP OFF)
4. http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/mxnet-validation%2Funix-gpu/detail/PR-18067/3/pipeline/417 (Python3: GPU)
5. Probably many more.

What have you tried to solve it?

[leezu]

Related #18090