Description

getenv() calls in libc are not threadsafe according to:

https://rachelbythebay.com/w/2017/01/30/env/
and
OpenMathLib/OpenBLAS#716

There are indirect calls to dmlc::GetEnv() all across the mxnet codebase, here are a few:

https://github.com/apache/incubator-mxnet/blob/266de6bef4da5769431557288d41fab2a02e52ca/src/engine/threaded_engine_perdevice.cc#L79
or
https://github.com/apache/incubator-mxnet/blob/5a83b6b563211f430688e41eab4752c6de4ecf22/src/executor/graph_executor.cc#L1194

Error Message:

/lib64/libc.so.6(+0x35250) [0x7fdc5b99b250]
/lib64/libc.so.6(getenv+0xad) [0x7fdc5b99e0cd]
/opt/amazon/lib/libmxnet.so(ZN4dmlc6GetEnvIbEET_PKcS1+0x1b) [0x7fdc4a1bedab]
/opt/amazon/lib/libmxnet.so(_ZN5mxnet4exec13GraphExecutor10InitOpSegsEv+0x1cb) [0x7fdc4a1b6e0b]
/opt/amazon/lib/libmxnet.so(_ZN5mxnet4exec13GraphExecutor15FinishInitGraphEN4nnvm6SymbolENS2_5GraphEPNS_8ExecutorERKSt13unordered_mapINS2_9NodeEntryENS_7NDArrayENS2_13NodeEntryHashENS2_14NodeEntryEqualESaISt4pairIKS8_S9_EEE+0x71b) [0x7fdc4a1b760b]
/opt/amazon/lib/libmxnet.so(_ZN5mxnet4exec13GraphExecutor4InitEN4nnvm6SymbolERKNS_7ContextERKSt3mapISsS4_St4lessISsESaISt4pairIKSsS4_EEERKSt6vectorIS4_SaIS4_EESL_SL_RKSt13unordered_mapISsNS2_6TShapeESt4hashISsESt8equal_toISsESaISA_ISB_SN_EEERKSM_ISsiSP_SR_SaISA_ISB_iEEES11_RKSH_INS_9OpReqType
ESaIS12_EERKSt13unordered_setISsSP_SR_SaISsEEPSH_INS_7NDArrayESaIS1C_EES1F_S1F_PSM_ISsS1C_SP_SR_SaISA_ISB_S1C_EEEPNS_8ExecutorERKSM_INS2_9NodeEntryES1C_NS2_13NodeEntryHashENS2_14NodeEntryEqualESaISA_IKS1M_S1C_EEE+0x75d) [0x7fdc4a1b958d]
/opt/amazon/lib/libmxnet.so(ZN5mxnet8Executor10SimpleBindEN4nnvm6SymbolERKNS_7ContextERKSt3mapISsS3_St4lessISsESaISt4pairIKSsS3_EEERKSt6vectorIS3_SaIS3_EESK_SK_RKSt13unordered_mapISsNS1_6TShapeESt4hashISsESt8equal_toISsESaIS9_ISA_SM_EEERKSL_ISsiSO_SQ_SaIS9_ISA_iEEES10_RKSG_INS_9OpReqTypeESaI
S11_EERKSt13unordered_setISsSO_SQ_SaISsEEPSG_INS_7NDArrayESaIS1B_EES1E_S1E_PSL_ISsS1B_SO_SQ_SaIS9_ISA_S1B_EEEPS0+0x1a6) [0x7fdc4a1b9f46]
/opt/amazon/lib/libmxnet.so(MXExecutorSimpleBind+0x1e38) [0x7fdc4a1031a8]
/opt/amazon/python2.7/lib/python2.7/lib-dynload/_ctypes.so(ffi_call_unix64+0x4c) [0x7fdc5af9b858]

Minimum reproducible example

TODO

Steps to reproduce

TODO