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Posted to issues@mxnet.apache.org by GitBox <gi...@apache.org> on 2021/03/08 14:29:23 UTC
[GitHub] [incubator-mxnet] nagyt2 opened a new issue #19994: MXNDArraySyncCopyToCPU() hangs
nagyt2 opened a new issue #19994:
URL: https://github.com/apache/incubator-mxnet/issues/19994
## Description
After running our python program several hours it comes to a point when it just hangs. I was able to attach to the process with both strace and gdb. Strace showed that the process waits on a futex:
```# strace -p 5567
strace: Process 5567 attached
futex(0x556f2ffce8, FUTEX_WAIT_PRIVATE, 0, NULL
```
Then the bactrace in gdb clearly shows that the issue comes from _MXNDArraySyncCopyToCPU_ (Please see lines 4-7):
```
(gdb) bt
#0 0x0000007fa49bf2a4 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556f2ffce8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1 0x0000007fa49bf2a4 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556f2ffc90, cond=0x556f2ffcc0) at pthread_cond_wait.c:502
#2 0x0000007fa49bf2a4 in __pthread_cond_wait (cond=0x556f2ffcc0, mutex=0x556f2ffc90) at pthread_cond_wait.c:655
#3 0x0000007f9f31fb78 in std::condition_variable::wait(std::unique_lock<std::mutex>&) () at /usr/lib/aarch64-linux-gnu/libstdc++.so.6
#4 0x0000007f747f06ec in mxnet::engine::ThreadedEngine::WaitForVar(mxnet::engine::Var*) () at /home/ubuntu/.cache/pypoetry/virtualenvs/g-R0-ACE-i-py3.7/lib/python3.7/site-packages/mxnet/libmxnet.so
#5 0x0000007f7406f1d0 in mxnet::NDArray::WaitToWrite() const () at /home/ubuntu/.cache/pypoetry/virtualenvs/g-R0-ACE-i-py3.7/lib/python3.7/site-packages/mxnet/libmxnet.so
#6 0x0000007f741ba700 in mxnet::NDArray::SyncCopyToCPU(void*, unsigned long) const () at /home/ubuntu/.cache/pypoetry/virtualenvs/g-R0-ACE-i-py3.7/lib/python3.7/site-packages/mxnet/libmxnet.so
#7 0x0000007f748680bc in MXNDArraySyncCopyToCPU () at /home/ubuntu/.cache/pypoetry/virtualenvs/g-R0-ACE-i-py3.7/lib/python3.7/site-packages/mxnet/libmxnet.so
#8 0x0000007f9ef75d28 in ffi_call_SYSV () at /usr/lib/aarch64-linux-gnu/libffi.so.6
#9 0x0000007f9ef76698 in ffi_call () at /usr/lib/aarch64-linux-gnu/libffi.so.6
#10 0x0000007f94cc5a60 in _call_function_pointer (argcount=3, resmem=0x7e4e8be2d0, restype=<optimized out>, atypes=<optimized out>, avalues=0x7fde292fe0, pProc=0x3, flags=-1798590016) at /tmp/python-build.20200412011356.1736/Python-3.7.7/Modules/_ctypes/callproc.c:829
#11 0x0000007f94cc5a60 in _ctypes_callproc (pProc=0x3, pProc@entry=0x7fa45497b8, argtuple=argtuple@entry=
(<c_void_p at remote 0x7e65fe3cb0>, <c_void_p(_arr=<numpy.ndarray at remote 0x7e4e98e030>) at remote 0x7e65fa8f80>, <c_ulong at remote 0x7e65fe3680>), flags=-1798590016, argtypes=argtypes@entry=0x0, restype=0x0,
restype@entry=<_ctypes.PyCSimpleType at remote 0x556d624c10>, checker=<unknown at remote 0x7fa4e1a000>) at /tmp/python-build.20200412011356.1736/Python-3.7.7/Modules/_ctypes/callproc.c:1186
#12 0x0000007f94cbb280 in PyCFuncPtr_call (self=0x7eb00cbef0, inargs=<optimized out>, kwds=<unknown at remote 0x7fa4e1a000>) at /tmp/python-build.20200412011356.1736/Python-3.7.7/Modules/_ctypes/_ctypes.c:4025
#13 0x0000007fa4bfbe1c in _PyObject_FastCallKeywords (callable=<_FuncPtr(__name__='MXNDArraySyncCopyToCPU') at remote 0x7eb00cbef0>, stack=<optimized out>, nargs=3, kwnames=<optimized out>) at Objects/call.c:199
#14 0x0000007fa4bd0af4 in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4619
#15 0x0000007fa4bd0af4 in _PyEval_EvalFrameDefault (f=<unknown at remote 0x7e660e82e8>, throwflag=<optimized out>) at Python/ceval.c:3093
#16 0x0000007fa4bc8cec in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=1, globals=<optimized out>) at Objects/call.c:283
#17 0x0000007fa4bcfc18 in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#18 0x0000007fa4bcfc18 in _PyEval_EvalFrameDefault (f=<unknown at remote 0x55a4348708>, throwflag=<optimized out>) at Python/ceval.c:3110
#19 0x0000007fa4cf2140 in _PyEval_EvalCodeWithName (_co=<code at remote 0x7f2c029030>, globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=13, kwnames=0xd, kwargs=0x7f2c0a0930, kwcount=0, kwstep=<optimized out>,
kwstep@entry=1, defs=0x7f2c026a68, defcount=<optimized out>, kwdefs=0x0, closure=<optimized out>, name=<optimized out>, qualname=<optimized out>) at Python/ceval.c:3930
#20 0x0000007fa4bfb6fc in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:433
#21 0x0000007fa4bd04d8 in call_function (kwnames=('force_reshape',), oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#22 0x0000007fa4bd04d8 in _PyEval_EvalFrameDefault (f=<unknown at remote 0x55a43484a8>, throwflag=<optimized out>) at Python/ceval.c:3139
#23 0x0000007fa4cf2140 in _PyEval_EvalCodeWithName (_co=<code at remote 0x7f2c0a0930>, globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=3, kwnames=0x556d349770, kwargs=0x7fa4e1a000 <langinfo_constants+592>, kwcount=367827125776, kwstep=<optimized out>, kwstep@entry=1, defs=0x7f2c025728, defcount=<optimized out>, kwdefs=0x0, closure=<optimized out>, name=<optimized out>, qualname=<optimized out>) at Python/ceval.c:3930
#24 0x0000007fa4bfb6fc in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:433
#25 0x0000007fa4bcfdac in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#26 0x0000007fa4bcfdac in _PyEval_EvalFrameDefault (f=<unknown at remote 0x55a4266188>, throwflag=<optimized out>) at Python/ceval.c:3124
#27 0x0000007fa4bc8cec in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=3, globals=<optimized out>) at Objects/call.c:283
#28 0x0000007fa4bcfc18 in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#29 0x0000007fa4bcfc18 in _PyEval_EvalFrameDefault (f=<unknown at remote 0x55aba447b8>, throwflag=<optimized out>) at Python/ceval.c:3110
#30 0x0000007fa4cf2140 in _PyEval_EvalCodeWithName (_co=<code at remote 0x7f2c0a0540>, globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=2, kwnames=0x556d349770, kwargs=0x7fa4e1a000 <langinfo_constants+592>, kwcount=367951890720, kwstep=<optimized out>, kwstep@entry=1, defs=0x7f2c09dfe8, defcount=<optimized out>, kwdefs=0x0, closure=<optimized out>, name=<optimized out>, qualname=<optimized out>) at Python/ceval.c:3930
#31 0x0000007fa4bfb6fc in _PyFunction_FastCallKeywords (func=<optimized out>, stack=<optimized out>, nargs=<optimized out>, kwnames=<optimized out>) at Objects/call.c:433
#32 0x0000007fa4bcfc18 in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#33 0x0000007fa4bcfc18 in _PyEval_EvalFrameDefault (f=<unknown at remote 0x7e4f5f8ee8>, throwflag=<optimized out>) at Python/ceval.c:3110
#34 0x0000007fa4bc8cec in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=2, globals=<optimized out>) at Objects/call.c:283
#35 0x0000007fa4bcfc18 in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#36 0x0000007fa4bcfc18 in _PyEval_EvalFrameDefault (f=<unknown at remote 0x7e4e989488>, throwflag=<optimized out>) at Python/ceval.c:3110
#37 0x0000007fa4bc8cec in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=1, globals=<optimized out>) at Objects/call.c:283
#38 0x0000007fa4bcfc18 in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#39 0x0000007fa4bcfc18 in _PyEval_EvalFrameDefault (f=<unknown at remote 0x556f2c8388>, throwflag=<optimized out>) at Python/ceval.c:3110
#40 0x0000007fa4bc8cec in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=1, globals=<optimized out>) at Objects/call.c:283
#41 0x0000007fa4bcfc18 in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#42 0x0000007fa4bcfc18 in _PyEval_EvalFrameDefault (f=<unknown at remote 0x7fa41acee8>, throwflag=<optimized out>) at Python/ceval.c:3110
#43 0x0000007fa4bc8cec in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=1, globals=<optimized out>) at Objects/call.c:283
#44 0x0000007fa4bcfdac in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#45 0x0000007fa4bcfdac in _PyEval_EvalFrameDefault (f=<unknown at remote 0x556d394908>, throwflag=<optimized out>) at Python/ceval.c:3124
#46 0x0000007fa4bc8cec in function_code_fastcall (co=<optimized out>, args=<optimized out>, nargs=1, globals=<optimized out>) at Objects/call.c:283
#47 0x0000007fa4bcfdac in call_function (kwnames=0x0, oparg=<optimized out>, pp_stack=<synthetic pointer>) at Python/ceval.c:4616
#48 0x0000007fa4bcfdac in _PyEval_EvalFrameDefault (f=<unknown at remote 0x7fa443f738>, throwflag=<optimized out>) at Python/ceval.c:3124
#49 0x0000007fa4cf2140 in _PyEval_EvalCodeWithName (_co=_co@entry=<code at remote 0x7fa443f5d0>, globals=globals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py') at remote 0x7fa44dd510>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7fa4598d10>, '__file__': '/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py', '__cached__': None, 'logging': <module at remote 0x7fa43ab590>, 'sys': <module at remote 0x7fa4592d70>, 'os': <module at remote 0x7fa44d8b30>, 'parse_main_args': <function at remote 0x7fa4298680>, 'App': <EnumMeta(_generate_next_value_=<function at remote 0x7fa430c4d0>, __module__='a.g.project_structure', __init__=<function at remote 0x7fa41d18c0>, __str__=<function at remote 0x7fa41f8dd0>, __repr__=<function at remote 0x7fa41f8e60>, __doc__='An enumeration.', _member_names_=['AR', 'STADIUM', 'SKIDATA', 'AVAT
ARION', 's', 'CONFERENCE', 'GANTNER', 'JETSON'], _member_map_={'AR': <App(_value_=...(truncated), locals=locals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py') at remote 0x7fa44dd510>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7fa4598d10>, '__file__': '/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py', '__cached__': None, 'logging': <module at remote 0x7fa43ab590>, 'sys': <module at remote 0x7fa4592d70>, 'os': <module at remote 0x7fa44d8b30>, 'parse_main_args': <function at remote 0x7fa4298680>, 'App': <EnumMeta(_generate_next_value_=<function at remote 0x7fa430c4d0>, __module__='a.g.project_structure', __init__=<function at remote 0x7fa41d18c0>, __str__=<function at remote 0x7fa41f8dd0>, __repr__=<function at remote 0x7fa41f8e60>, __doc__='An enumeration.', _member_names_=['AR', 'STADIUM', 'SKIDATA', 'AVATARI
ON', 's', 'CONFERENCE', 'GANTNER', 'JETSON'], _member_map_={'AR': <App(_value_=...(truncated), args=args@entry=0x0, argcount=548217913904, argcount@entry=0, kwnames=0x7fa44dcd90, kwnames@entry=0x0, kwargs=0x7fa4d29890 <PyRun_FileExFlags+184>, kwargs@entry=0x0, kwcount=kwcount@entry=0, kwstep=<optimized out>, kwstep@entry=2, defs=defs@entry=0x0, defcount=<optimized out>,
defcount@entry=0, kwdefs=kwdefs@entry=0x0, closure=<optimized out>, closure@entry=0x0, name=<optimized out>, name@entry=0x0, qualname=<optimized out>, qualname@entry=0x0) at Python/ceval.c:3930
#50 0x0000007fa4cf22e0 in PyEval_EvalCodeEx (_co=_co@entry=<code at remote 0x7fa443f5d0>, globals=globals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py') at remote 0x7fa44dd510>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7fa4598d10>, '__file__': '/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py', '__cached__': None, 'logging': <module at remote 0x7fa43ab590>, 'sys': <module at remote 0x7fa4592d70>, 'os': <module at remote 0x7fa44d8b30>, 'parse_main_args': <function at remote 0x7fa4298680>, 'App': <EnumMeta(_generate_next_value_=<function at remote 0x7fa430c4d0>, __module__='a.g.project_structure', __init__=<function at remote 0x7fa41d18c0>, __str__=<function at remote 0x7fa41f8dd0>, __repr__=<function at remote 0x7fa41f8e60>, __doc__='An enumeration.', _member_names_=['AR', 'STADIUM', 'SKIDATA', 'AVATARION',
's', 'CONFERENCE', 'GANTNER', 'JETSON'], _member_map_={'AR': <App(_value_=...(truncated), locals=locals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py') at remote 0x7fa44dd510>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7fa4598d10>, '__file__': '/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py', '__cached__': None, 'logging': <module at remote 0x7fa43ab590>, 'sys': <module at remote 0x7fa4592d70>, 'os': <module at remote 0x7fa44d8b30>, 'parse_main_args': <function at remote 0x7fa4298680>, 'App': <EnumMeta(_generate_next_value_=<function at remote 0x7fa430c4d0>, __module__='a.g.project_structure', __init__=<function at remote 0x7fa41d18c0>, __str__=<function at remote 0x7fa41f8dd0>, __repr__=<function at remote 0x7fa41f8e60>, __doc__='An enumeration.', _member_names_=['AR', 'STADIUM', 'SKIDATA', 'AVATARION', 's
', 'CONFERENCE', 'GANTNER', 'JETSON'], _member_map_={'AR': <App(_value_=...(truncated), args=args@entry=0x0, argcount=argcount@entry=0, kws=kws@entry=0x0, kwcount=kwcount@entry=0, defs=defs@entry=0x0, defcount=defcount@entry=0, kwdefs=kwdefs@entry=0x0, closure=closure@entry=0x0) at Python/ceval.c:3959
#51 0x0000007fa4cf231c in PyEval_EvalCode (co=co@entry=<code at remote 0x7fa443f5d0>, globals=globals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/home/ubuntu/a/g/bin/../components/g/src---Type <return> to continue, or q <return> to quit---
/py/a/g/main.py') at remote 0x7fa44dd510>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7fa4598d10>, '__file__': '/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py', '__cached__': None, 'logging': <module at remote 0x7fa43ab590>, 'sys': <module at remote 0x7fa4592d70>, 'os': <module at remote 0x7fa44d8b30>, 'parse_main_args': <function at remote 0x7fa4298680>, 'App': <EnumMeta(_generate_next_value_=<function at remote 0x7fa430c4d0>, __module__='a.g.project_structure', __init__=<function at remote 0x7fa41d18c0>, __str__=<function at remote 0x7fa41f8dd0>, __repr__=<function at remote 0x7fa41f8e60>, __doc__='An enumeration.', _member_names_=['AR', 'STADIUM', 'SKIDATA', 'AVATARION', 's', 'CONFERENCE', 'GANTNER', 'JETSON'], _member_map_={'AR': <App(_value_=...(truncated), locals=locals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/home/ubuntu/a/g/bin/../components/g/src/
py/a/g/main.py') at remote 0x7fa44dd510>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7fa4598d10>, '__file__': '/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py', '__cached__': None, 'logging': <module at remote 0x7fa43ab590>, 'sys': <module at remote 0x7fa4592d70>, 'os': <module at remote 0x7fa44d8b30>, 'parse_main_args': <function at remote 0x7fa4298680>, 'App': <EnumMeta(_generate_next_value_=<function at remote 0x7fa430c4d0>, __module__='a.g.project_structure', __init__=<function at remote 0x7fa41d18c0>, __str__=<function at remote 0x7fa41f8dd0>, __repr__=<function at remote 0x7fa41f8e60>, __doc__='An enumeration.', _member_names_=['AR', 'STADIUM', 'SKIDATA', 'AVATARION', 's', 'CONFERENCE', 'GANTNER', 'JETSON'], _member_map_={'AR': <App(_value_=...(truncated)) at Python/ceval.c:524
#52 0x0000007fa4d29890 in run_mod (arena=0x7fa44dcd90, flags=0x7fde294770, locals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': ... at Python/pythonrun.c:1035
#53 0x0000007fa4d29890 in PyRun_FileExFlags (fp=fp@entry=0x556d394ec0, filename_str=filename_str@entry=0x7fa448be50 "/home/ubuntu/a/g/bin/../components/g/src/py/a/g/main.py", start=start@entry=257,... at Python/pythonrun.c:429
#55 0x0000007fa4d29f18 in PyRun_AnyFileExFlags (fp=fp@entry=0x556d394ec0, filename=<optimized out>, closeit=closeit@entry=1, flags=flags@entry=0x7fde294770) at Python/pythonrun.c:84
#56 0x0000007fa4d4d01c in pymain_run_file (p_cf=0x7fde294770, filename=<optimized out>, fp=0x556d394ec0) at Modules/main.c:456
#57 0x0000007fa4d4d01c in pymain_run_filename (cf=0x7fde294770, pymain=0x7fde294848) at Modules/main.c:1635
#58 0x0000007fa4d4d01c in pymain_run_python (pymain=0x7fde294848) at Modules/main.c:2896
#59 0x0000007fa4d4d01c in pymain_main (pymain=0x7fde294848, pymain@entry=0x7fde294858) at Modules/main.c:3057
#60 0x0000007fa4d4d2cc in _Py_UnixMain (argc=<optimized out>, argv=<optimized out>) at Modules/main.c:3092
#61 0x0000007fa49fe720 in __libc_start_main (main=0x0, argc=0, argv=0x0, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=<optimized out>) at ../csu/libc-start.c:310
#62 0x000000556131b908 in _start ()
```
### Error Message
There is no error message, the application just hangs
## To Reproduce
The issue comes sporadically sometimes after hours, sometimes after days, it's hard to reproduce
## Environment
The runtime environment is based on the Jetson Nano box from NVidia. Processor is armv8, we have 4GB RAM. mxnet 1.6 w/ CUDA 10.0 are used.
Please note that the PYTHON version reported by _diagnose.py_ **differs** from the one we are using running our application. (We are using pyenv, not the distribution delivered python package). We run the application using **Python 3.7.7**.
<details>
<summary>Environment Information</summary>
```
----------Python Info----------
Version : 3.6.9
Compiler : GCC 8.4.0
Build : ('default', 'Jan 26 2021 15:33:00')
Arch : ('64bit', 'ELF')
------------Pip Info-----------
Version : 9.0.1
Directory : /usr/lib/python3/dist-packages/pip
----------MXNet Info-----------
No MXNet installed.
----------System Info----------
Platform : Linux-4.9.140-tegra-aarch64-with-Ubuntu-18.04-bionic
system : Linux
node : sc1
release : 4.9.140-tegra
version : #1 SMP PREEMPT Mon Dec 9 22:47:42 PST 2019
----------Hardware Info----------
machine : aarch64
processor : aarch64
Architecture: aarch64
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 1
Core(s) per socket: 4
Socket(s): 1
Vendor ID: ARM
Model: 1
Model name: Cortex-A57
Stepping: r1p1
CPU max MHz: 1479.0000
CPU min MHz: 102.0000
BogoMIPS: 38.40
L1d cache: 32K
L1i cache: 48K
L2 cache: 2048K
Flags: fp asimd evtstrm aes pmull sha1 sha2 crc32
----------Network Test----------
Setting timeout: 10
Timing for MXNet: https://github.com/apache/incubator-mxnet, DNS: 0.0020 sec, LOAD: 0.5257 sec.
Timing for Gluon Tutorial(en): http://gluon.mxnet.io, DNS: 0.0012 sec, LOAD: 0.2078 sec.
Error open Gluon Tutorial(cn): https://zh.gluon.ai, <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:852)>, DNS finished in 0.0013172626495361328 sec.
Timing for FashionMNIST: https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/gluon/dataset/fashion-mnist/train-labels-idx1-ubyte.gz, DNS: 0.0007 sec, LOAD: 0.6361 sec.
Timing for PYPI: https://pypi.python.org/pypi/pip, DNS: 0.0099 sec, LOAD: 0.1532 sec.
Error open Conda: https://repo.continuum.io/pkgs/free/, HTTP Error 403: Forbidden, DNS finished in 0.014477014541625977 sec.
----------Environment----------
```
</details>
If I can provide any more information in order to hunt this bug down, please do not hesitate to let me know!
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[GitHub] [incubator-mxnet] github-actions[bot] commented on issue #19994: MXNDArraySyncCopyToCPU() hangs
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on issue #19994:
URL: https://github.com/apache/incubator-mxnet/issues/19994#issuecomment-792794619
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