@Chris: If you actually go and read the issue that I linked above, you can see that I was using gdb. Maybe you can have a look into the issue if you have an idea to fix. The backtrace points to a segfault in the omp library. While the cause could be somewhere else which is causing undefined behaviour, taking into consideration that this is not happening with libgomp and other engineers believe that mixing openmp implementations at runtime can cause UB, it's reasonable to believe that there's a good chance that is related to this. I personally don't have time to investigate this further, as I don't think introducing this dependency is worth the trouble is causing, when the one provided by the platform works well enough.
0x00007ffff43b284a in __kmp_fork_call () from /home/piotr/mxnet/build/3rdparty/openmp/runtime/src/libomp.so (gdb) bt @Lin: I personally wouldn't be comfortable releasing a version that segfaults, I don't think that meets the quality bar. but this is up to the community to decide, I'm only reporting what I observe. Releasing with indications of this kind of problems causes issues later in downstream projects and running services. On Tue, Feb 4, 2020 at 11:07 AM Chris Olivier <cjolivie...@gmail.com> wrote: > When "fixing", please "fix" through actual root-cause analysis (use gdb, > for instance) and not simply by guesswork and cutting out things which > probably aren't actually at fault (blaming an OMP library that's in > worldwide distribution int he billions should be treated with great > skepticism). > > On Tue, Feb 4, 2020 at 10:44 AM Lin Yuan <apefor...@gmail.com> wrote: > > > Pedro, > > > > While I agree with you we need to fix this usability issue, I don't think > > this is a release blocker as Przemek mentioned above. Could we fix this > in > > the next minor release? > > > > Thanks, > > > > Lin > > > > On Tue, Feb 4, 2020 at 10:38 AM Pedro Larroy < > pedro.larroy.li...@gmail.com > > > > > wrote: > > > > > Right. Would it be possible to have the CMake build also use libgomp > for > > > consistency with the releases until these issues are resolved? > > > This can affect anyone compiling the distribution with CMake and also > > > happens randomly in CI, worsening the contributor experience due to CI > > > failures. > > > > > > On Tue, Feb 4, 2020 at 9:33 AM Przemysław Trędak <ptre...@apache.org> > > > wrote: > > > > > > > Hi Pedro, > > > > > > > > From the issue that you linked it seems that you are using the LLVM > > > > OpenMP, whereas I believe the actual release uses libgomp (at least > > > that's > > > > what seems to be the conclusion from this issue: > > > > https://github.com/apache/incubator-mxnet/issues/16891)? > > > > > > > > Przemek > > > > > > > > On 2020/02/04 03:42:30, Pedro Larroy <pedro.larroy.li...@gmail.com> > > > > wrote: > > > > > -1 > > > > > > > > > > Unit tests passed in CPU build. > > > > > > > > > > I observe crashes related to openmp using cpp unit tests: > > > > > > > > > > https://github.com/apache/incubator-mxnet/issues/17043 > > > > > > > > > > Pedro. > > > > > > > > > > On Mon, Feb 3, 2020 at 6:44 PM Chaitanya Bapat < > chai.ba...@gmail.com > > > > > > > wrote: > > > > > > > > > > > +1 > > > > > > Successfully built MXNet 1.6.0rc2 on Linux > > > > > > Tested for OpPerf utility > > > > > > For CPU - > > > > > > > > https://gist.github.com/ChaiBapchya/d5ecc3e971c5a3c558d672477b4b6b9c > > > > > > > > > > > > Works well! > > > > > > > > > > > > > > > > > > > > > > > > On Mon, 3 Feb 2020 at 15:43, Lin Yuan <apefor...@gmail.com> > wrote: > > > > > > > > > > > > > +1 > > > > > > > > > > > > > > Tested Horovod with mnist example. My compiler flags are below: > > > > > > > > > > > > > > [✔ CUDA, ✔ CUDNN, ✔ NCCL, ✔ CUDA_RTC, ✖ TENSORRT, ✔ CPU_SSE, ✔ > > > > CPU_SSE2, > > > > > > ✔ > > > > > > > CPU_SSE3, ✔ CPU_SSE4_1, ✔ CPU_SSE4_2, ✖ CPU_SSE4A, ✔ CPU_AVX, ✖ > > > > > > CPU_AVX2, ✔ > > > > > > > OPENMP, ✖ SSE, ✔ F16C, ✖ JEMALLOC, ✔ BLAS_OPEN, ✖ BLAS_ATLAS, ✖ > > > > > > BLAS_MKL, ✖ > > > > > > > BLAS_APPLE, ✔ LAPACK, ✖ MKLDNN, ✔ OPENCV, ✖ CAFFE, ✖ PROFILER, > ✔ > > > > > > > DIST_KVSTORE, ✖ CXX14, ✖ INT64_TENSOR_SIZE, ✖ SIGNAL_HANDLER, ✖ > > > > DEBUG, ✖ > > > > > > > TVM_OP] > > > > > > > > > > > > > > Lin > > > > > > > > > > > > > > On Sat, Feb 1, 2020 at 9:55 PM Tao Lv <ta...@apache.org> > wrote: > > > > > > > > > > > > > > > +1 > > > > > > > > > > > > > > > > I tested below items: > > > > > > > > 1. download artifacts from Apache dist repo; > > > > > > > > 2. the signature looks good; > > > > > > > > 3. build from source code with MKL-DNN and MKL on centos; > > > > > > > > 4. run fp32 and int8 inference of ResNet50 under > > > > > > /example/quantization/. > > > > > > > > > > > > > > > > thanks, > > > > > > > > -tao > > > > > > > > > > > > > > > > On Sun, Feb 2, 2020 at 11:00 AM Tao Lv <ta...@apache.org> > > wrote: > > > > > > > > > > > > > > > > > I see. I was looking at this page: > > > > > > > > > > > > https://github.com/apache/incubator-mxnet/releases/tag/1.6.0.rc2 > > > > > > > > > > > > > > > > > > On Sun, Feb 2, 2020 at 4:54 AM Przemysław Trędak < > > > > ptre...@apache.org > > > > > > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > >> Hi Tao, > > > > > > > > >> > > > > > > > > >> Could you tell me where did you look for it and did not > find > > > > it? I > > > > > > > just > > > > > > > > >> checked and both > > > > > > > > >> > > > > https://dist.apache.org/repos/dist/dev/incubator/mxnet/1.6.0.rc2/ > > > > > > and > > > > > > > > >> draft of the release on GitHub have them. > > > > > > > > >> > > > > > > > > >> Thank you > > > > > > > > >> Przemek > > > > > > > > >> > > > > > > > > >> On 2020/02/01 14:23:11, Tao Lv <ta...@apache.org> wrote: > > > > > > > > >> > It seems the src tar and signature are missing from the > > tag. > > > > > > > > >> > > > > > > > > > >> > On Fri, Jan 31, 2020 at 11:09 AM Przemysław Trędak < > > > > > > > > ptre...@apache.org> > > > > > > > > >> > wrote: > > > > > > > > >> > > > > > > > > > >> > > Dear MXNet community, > > > > > > > > >> > > > > > > > > > > >> > > This is the vote to release Apache MXNet (incubating) > > > > version > > > > > > > 1.6.0. > > > > > > > > >> > > Voting starts today and will close on Monday 2/3/2020 > > > 23:59 > > > > PST. > > > > > > > > >> > > > > > > > > > > >> > > Link to release notes: > > > > > > > > >> > > > > > > > > > > > > > > > https://cwiki.apache.org/confluence/display/MXNET/1.6.0+Release+notes > > > > > > > > >> > > > > > > > > > > >> > > Link to release candidate: > > > > > > > > >> > > > > > > > > https://github.com/apache/incubator-mxnet/releases/tag/1.6.0.rc2 > > > > > > > > >> > > > > > > > > > > >> > > Link to source and signatures on apache dist server: > > > > > > > > >> > > > > > > > > > https://dist.apache.org/repos/dist/dev/incubator/mxnet/1.6.0.rc2/ > > > > > > > > >> > > > > > > > > > > >> > > The differences comparing to previous release > candidate > > > > > > 1.6.0.rc1: > > > > > > > > >> > > * Fixes for license issues (#17361, #17375, #17370, > > > #17460) > > > > > > > > >> > > * Bugfix for saving LSTM layer parameter (#17288) > > > > > > > > >> > > * Bugfix for downloading the model from model zoo > from > > > > multiple > > > > > > > > >> processes > > > > > > > > >> > > (#17372) > > > > > > > > >> > > * Fixed a symbol.py in AMP for GluonNLP (#17408) > > > > > > > > >> > > > > > > > > > > >> > > > > > > > > > > >> > > Please remember to TEST first before voting > accordingly: > > > > > > > > >> > > +1 = approve > > > > > > > > >> > > +0 = no opinion > > > > > > > > >> > > -1 = disapprove (provide reason) > > > > > > > > >> > > > > > > > > > > >> > > > > > > > > > > >> > > Best regards, > > > > > > > > >> > > Przemyslaw Tredak > > > > > > > > >> > > > > > > > > > > >> > > > > > > > > > >> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > *Chaitanya Prakash Bapat* > > > > > > *+1 (973) 953-6299* > > > > > > > > > > > > [image: https://www.linkedin.com//in/chaibapat25] > > > > > > <https://github.com/ChaiBapchya>[image: > > > > https://www.facebook.com/chaibapat > > > > > > ] > > > > > > <https://www.facebook.com/chaibapchya>[image: > > > > > > https://twitter.com/ChaiBapchya] < > https://twitter.com/ChaiBapchya > > > > >[image: > > > > > > https://www.linkedin.com//in/chaibapat25] > > > > > > <https://www.linkedin.com//in/chaibapchya/> > > > > > > > > > > > > > > > > > > > > >
