samskalicky edited a comment on issue #13438: libc getenv is not threadsafe URL: https://github.com/apache/incubator-mxnet/issues/13438#issuecomment-447092634 I was able to run the user's test script and reproduce in GDB. Looks like its failing when calling getenv("MXNET_EXEC_BULK_EXEC_INFERENCE"). This only seems to happen here: https://github.com/apache/incubator-mxnet/blob/5a83b6b563211f430688e41eab4752c6de4ecf22/src/executor/graph_executor.cc#L1186-L1209 This matches the original stack trace where we found it failing in GraphExecutor::InitOpSegs
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