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From Da Zheng <zhengda1...@gmail.com>
Subject Re: segmentation fault in master using mkdlnn
Date Thu, 03 May 2018 13:32:53 GMT
can we build it in CI?segfault doesn't happen infrequently.

2018年5月2日 下午11:34,"Chris Olivier" <cjolivier01@gmail.com>写道:

> you can try Intel Inspector, which is like an enhanced version of valgrind
> with a GUI and whatnot.
>
> On Wed, May 2, 2018 at 9:42 PM Da Zheng <zhengda1936@gmail.com> wrote:
>
> > valgrind doesn't work with Python. also, valgrind doesn't support some
> > CPU instructions used by MXNet (I think some instructions related to
> > random generator).
> >
> >
> > On Wed, May 2, 2018 at 8:59 PM, Bhavin Thaker <bhavinthaker@gmail.com>
> > wrote:
> > > Have you tried running with valgrind to get some clues on the
> root-cause?
> > >
> > > Bhavin Thaker.
> > >
> > > On Wed, May 2, 2018 at 8:55 PM Da Zheng <zhengda1936@gmail.com> wrote:
> > >
> > >> It might also be possible that this isn't an MKLDNN bug.
> > >> I just saw a similar memory error without MKLDNN build.
> > >>
> > >>
> > http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/
> incubator-mxnet/detail/PR-10783/1/pipeline
> > >>
> > >> Best,
> > >> Da
> > >>
> > >> On Wed, May 2, 2018 at 2:14 PM, Zheng, Da <dzzhen@amazon.com> wrote:
> > >> > There might be a race condition that causes the memory error.
> > >> > It might be caused by this PR:
> > >> > https://github.com/apache/incubator-mxnet/pull/10706/files
> > >> > This PR removes MKLDNN memory from NDArray.
> > >> > However, I don't know why this causes memory error. If someone is
> > using
> > >> the memory, it should still hold the memory with shared pointer.
> > >> > But I do see the memory error increase after this PR is merged.
> > >> >
> > >> > Best,
> > >> > Da
> > >> >
> > >> > On 5/2/18, 12:26 PM, "Pedro Larroy" <pedro.larroy.lists@gmail.com>
> > >> wrote:
> > >> >
> > >> >     I couldn't reproduce locally with:
> > >> >
> > >> >     ci/build.py -p ubuntu_cpu /work/runtime_functions.sh
> > >> >     build_ubuntu_cpu_mkldnn && ci/build.py --platform ubuntu_cpu
> > >> >     /work/runtime_functions.sh unittest_ubuntu_python2_cpu
> > >> >
> > >> >
> > >> >     On Wed, May 2, 2018 at 8:50 PM, Pedro Larroy <
> > >> pedro.larroy.lists@gmail.com>
> > >> >     wrote:
> > >> >
> > >> >     > Hi
> > >> >     >
> > >> >     > Seems master is not running  anymore, there's a segmentation
> > fault
> > >> using
> > >> >     > MKDLNN-CPU
> > >> >     >
> > >> >     >
> > http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/
> > >> >     > incubator-mxnet/detail/master/801/pipeline/662
> > >> >     >
> > >> >     >
> > >> >     > I see my PRs failing with a similar error.
> > >> >     >
> > >> >     > Pedro
> > >> >     >
> > >> >
> > >> >
> > >>
> >
>

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