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Posted to commits@mxnet.apache.org by GitBox <gi...@apache.org> on 2020/08/16 15:53:44 UTC
[GitHub] [incubator-mxnet] DNXie opened a new issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
DNXie opened a new issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944
## Description
(A clear and concise description of what the bug is.)
`mx.contrib.autograd.mark_variables` throws segmentation fault when `variables` and `gradients` are ndarray
### Error Message
(Paste the complete error message. Please also include stack trace by setting environment variable `DMLC_LOG_STACK_TRACE_DEPTH=10` before running your script.)
~~~
Segmentation fault: 11
Stack trace:
[bt] (0) /root/miniconda3/lib/python3.7/site-packages/mxnet/libmxnet.so(+0x3c27360) [0x7ff946381360]
~~~
## To Reproduce
(If you developed your own code, please provide a short script that reproduces the error. For existing examples, please provide link.)
~~~python
import mxnet as mx
mx.contrib.autograd.mark_variables(variables=mx.nd.ones((2)), gradients=mx.nd.ones((1)))
~~~
## Environment
We recommend using our script for collecting the diagnositc information. Run the following command and paste the outputs below:
```
curl --retry 10 -s https://raw.githubusercontent.com/dmlc/gluon-nlp/master/tools/diagnose.py | python
# paste outputs here
```
OS: ubuntu 18.04
Python: 3.7.6
pip: 20.0.2
numpy: 1.18.5
mxnet: 1.6.0
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[GitHub] [incubator-mxnet] leezu commented on issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
Posted by GitBox <gi...@apache.org>.
leezu commented on issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944#issuecomment-675058069
@DNXie would you like to contribute a PR to fix the issue? Please build MXNet from source and add the `CMAKE_BUILD_TYPE` option when calling cmake: `cmake -DCMAKE_BUILD_TYPE=Debug ..`. Then the Stack trace above would point you to the function that needs change for avoiding crash.
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[GitHub] [incubator-mxnet] DNXie closed issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
Posted by GitBox <gi...@apache.org>.
DNXie closed issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944
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[GitHub] [incubator-mxnet] github-actions[bot] commented on issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944#issuecomment-674543603
Welcome to Apache MXNet (incubating)! We are on a mission to democratize AI, and we are glad that you are contributing to it by opening this issue.
Please make sure to include all the relevant context, and one of the @apache/mxnet-committers will be here shortly.
If you are interested in contributing to our project, let us know! Also, be sure to check out our guide on [contributing to MXNet](https://mxnet.apache.org/community/contribute) and our [development guides wiki](https://cwiki.apache.org/confluence/display/MXNET/Developments).
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[GitHub] [incubator-mxnet] szha commented on issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
Posted by GitBox <gi...@apache.org>.
szha commented on issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944#issuecomment-683466670
The mx.autograd version doesn't seem to have the same problem since the following works.
```
import mxnet as mx
mx.autograd.mark_variables(variables=mx.nd.ones((2)), gradients=mx.nd.ones((1)))
```
I'm removing the contrib.autograd module in #19046 in master.
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[GitHub] [incubator-mxnet] DNXie commented on issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
Posted by GitBox <gi...@apache.org>.
DNXie commented on issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944#issuecomment-674567647
Duplicate with #18941. Will close this one.
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[GitHub] [incubator-mxnet] DNXie removed a comment on issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
Posted by GitBox <gi...@apache.org>.
DNXie removed a comment on issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944#issuecomment-674567647
Duplicate with #18941. Will close this one.
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[GitHub] [incubator-mxnet] DNXie commented on issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
Posted by GitBox <gi...@apache.org>.
DNXie commented on issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944#issuecomment-674572053
The bug is also reproducible in nightly version.
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[GitHub] [incubator-mxnet] szha commented on issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
Posted by GitBox <gi...@apache.org>.
szha commented on issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944#issuecomment-674572369
thanks for reporting. while I don't think it should segfault and abort, in your program both the variable and grad don't have other references, so the ref count decreases to zero right after creation and thus autograd receives the spaces that are already freed.
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[GitHub] [incubator-mxnet] DNXie commented on issue #18944: `mx.contrib.autograd.mark_variables` segmentation fault
Posted by GitBox <gi...@apache.org>.
DNXie commented on issue #18944:
URL: https://github.com/apache/incubator-mxnet/issues/18944#issuecomment-674577083
@szha But it is not good to let a program crash just because invalid input, right? Probably it can be fixed with some python exception. Thanks!
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