test_tcnn_instant_ngp_field() Segmentation Fault

[tancik]

test_tcnn_instant_ngp_field() has a segfault. This test is only run locally since the github actions don't have tcnn. Interestingly the segfault does not occur if you run the test using the debugger.

[tancik]

I think this may have emerged with the recent instant_ngp implementation updates. Maybe @liruilong940607 has some ideas?

[liruilong940607]

Somehow I can't reproduce the segfault on my local, with the latest master branch, by running:

either

 pytest tests/fields/test_fields.py

or

python tests/fields/test_fields.py

I even looped the test for 1000 times and still can't see errors.

Can you run the NGP training successfully?

[liruilong940607]

Also this test is quite weird to fail because it only test the field. It doesn't call any CUDA functions used by instant_ngp.

[liruilong940607]

Would you able to locate which commit might cause this? i.e. By reverting to which commit the test can pass.

[tancik]

NGP training works for me. Oddly it only fails for me when I don't run with the debugger. I think Ethan is also has seen this segfault. I'll try to figure out which pr introduced this.

[tancik]

Hmmm, even more mysterious. Doesn't seem tied to a commit, I tried going back pretty far, and this only became an issue in the last week or so. Maybe some package version? @ethanweber are you also still having this issue?

[liruilong940607]

The fact that VScode debugger doesn't fail this test makes me also feel there might be a difference between your local environment v.s. VScode setting

[liruilong940607]

But you can run NGP training without issue .. hmmm no idea what is going on

[ethanweber]

I do still have the issue but training is fine. Pretty much the same experience as Matt.

[akristoffersen]

I've been having similar issues-- I ran NGP with faulthandler enabled, and this is what I got.

[2022-08-14 15:42:17,618][root][INFO] - Continuing without viewer.
[2022-08-14 15:42:17,874][root][INFO] - No eval dataset specified so using train dataset for eval.
Fatal Python error: Segmentation fault

Thread 0x00007f6b05bc3700 (most recent call first):
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/threading.py", line 306 in wait
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/queue.py", line 179 in get
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/site-packages/tensorboard/summary/writer/event_file_writer.py", line 227 in run
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/threading.py", line 932 in _bootstrap_inner
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/threading.py", line 890 in _bootstrap

Current thread 0x00007f6b658880c0 (most recent call first):
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/fields/density_fields/density_grid.py", line 107 in __init__
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/utils/misc.py", line 90 in instantiate_from_dict_config
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/models/base.py", line 94 in populate_density_field
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/models/base.py", line 74 in __init__
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/models/instant_ngp.py", line 50 in __init__
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/utils/misc.py", line 90 in instantiate_from_dict_config
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/models/base.py", line 232 in setup_model
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/utils/profiler.py", line 38 in wrapper
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/pipelines/base.py", line 139 in setup_pipeline
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/utils/profiler.py", line 38 in wrapper
  File "/home/eecs/akristoffersen/kair/pyrad/nerfactory/engine/trainer.py", line 81 in setup
  File "scripts/run_train.py", line 131 in _train
  File "scripts/run_train.py", line 165 in launch
  File "scripts/run_train.py", line 225 in main
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/site-packages/hydra/core/utils.py", line 186 in run_job
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/site-packages/hydra/_internal/hydra.py", line 119 in run
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/site-packages/hydra/_internal/utils.py", line 453 in <lambda>
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/site-packages/hydra/_internal/utils.py", line 213 in run_and_report
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/site-packages/hydra/_internal/utils.py", line 452 in _run_app
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/site-packages/hydra/_internal/utils.py", line 389 in _run_hydra
  File "/data/akristoffersen/anaconda/envs/nerfactory/lib/python3.8/site-packages/hydra/main.py", line 90 in decorated_main
  File "scripts/run_train.py", line 236 in <module>
/var/lib/slurm-llnl/slurmd/job08862/slurm_script: line 30: 50249 Segmentation fault      python scripts/run_train.py --config-name=graph_instant_ngp.yaml

[liruilong940607]

@akristoffersen I think your issue is a different one. It seems to be caused by this line:

https://github.com/plenoptix/nerfactory/blob/387057cd61c9484e1457fccc1e8119b9149cd41b/nerfactory/fields/density_fields/density_grid.py#L106-L107

which requires GPU ("cuda:0") to run it.

Also seems like you are using slurm to run it? I'm not familiar with slurm, but a guess is maybe slurm does some special device management?

[tancik]

No longer an issue.