Mantaflow error when using blender in background mode #87828

New Issue

Robin Schyboll · 2021-04-26T14:21:18+02:00

Robin Schyboll commented

2021-04-26 14:21:18 +02:00

System Information
Operating system: Linux-5.11.16-arch1-1-x86_64-with-arch-RebornOS-release 64 Bits
Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.24.02

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab, also broken ce64cfd6ed

Short description of error
When running blender in background mode, or as a python module, and opening a .blend file through a python script with a Mantaflow simulation, it throws the following error:

terminate called after throwing an instance of 'Manta::Error'
  what():  can't clean grid cache, some grids are still in use
Error raised in extern/mantaflow/preprocessed/fluidsolver.cpp:33

T87828_assertandexception.txt

Exact steps for others to reproduce the error

Create a default scene with a quick smoke example, and save it to a .blend file
Create a python script with the following content:

import bpy
bpy.ops.wm.open_mainfile(filepath=".blend file path")

Launch blender with the following command:

blender -b --python script.py

Similar issues
I encountered issues with similar errors, but i submitted a new one because of a different way of triggering that error:
#87021 (Program Close after free data liquid simulation)
#80154 (Mantaflow rendering unstable (when using multiple fluid domains))
#87975 (Mantaflow simulation stops and crashes at the end of the bake (or when closing blender): The CG solver diverged, residual norm > 1e30, stopping.)
slightly old one blender/blender-addons#75889 (Mantaflow problem when baking via Python API)

Additional information
I did encounter another error, when using blender as a python module, which may or may not be related to this issue, i can't tell really.
After building blender and installing it as a module to my python venv, when launching the same script as before, i get the same error when exiting the script.
But when loading the file, i get another error:

Traceback (most recent call last):
  File "<string>", line 107, in <module>
AttributeError: 'LevelsetGrid' object has no attribute 'setConst'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "<string>", line 130, in smoke_load_data_1
NameError: name 'fluid_data_dict_final_s1' is not defined
Traceback (most recent call last):
  File "<string>", line 1, in <module>
TypeError: 'NoneType' object is not callable

I can't really tell, if i'm doing something wrong, or if it is some kind of bug, but when using blender as a python module, i cannot render any fluid sims, they just disappear in the render output.
I found that someone had a similar issue on devtalk, but the topic was not continued:
Devtalk: 15460
When using blender normally in background mode, i am able to render it, but still, the error exists in both cases, the second one only when using as a python module, can't really tell if they are related.

**System Information** Operating system: Linux-5.11.16-arch1-1-x86_64-with-arch-RebornOS-release 64 Bits Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.24.02 **Blender Version** Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: `02948a2cab`, also broken ce64cfd6ed **Short description of error** When running blender in background mode, or as a python module, and opening a .blend file through a python script with a Mantaflow simulation, it throws the following error: ``` terminate called after throwing an instance of 'Manta::Error' what(): can't clean grid cache, some grids are still in use Error raised in extern/mantaflow/preprocessed/fluidsolver.cpp:33 ``` [T87828_assertandexception.txt](https://archive.blender.org/developer/F10194218/T87828_assertandexception.txt) **Exact steps for others to reproduce the error** - Create a default scene with a quick smoke example, and save it to a .blend file - Create a python script with the following content: ``` import bpy bpy.ops.wm.open_mainfile(filepath=".blend file path") ``` - Launch blender with the following command: ``` blender -b --python script.py ``` **Similar issues** I encountered issues with similar errors, but i submitted a new one because of a different way of triggering that error: #87021 (Program Close after free data liquid simulation) #80154 (Mantaflow rendering unstable (when using multiple fluid domains)) #87975 (Mantaflow simulation stops and crashes at the end of the bake (or when closing blender): The CG solver diverged, residual norm > 1e30, stopping.) slightly old one blender/blender-addons#75889 (Mantaflow problem when baking via Python API) **Additional information** I did encounter another error, when using blender as a python module, which may or may not be related to this issue, i can't tell really. After building blender and installing it as a module to my python venv, when launching the same script as before, i get the same error when exiting the script. But when loading the file, i get another error: ``` Traceback (most recent call last): File "<string>", line 107, in <module> AttributeError: 'LevelsetGrid' object has no attribute 'setConst' Traceback (most recent call last): File "<string>", line 1, in <module> File "<string>", line 130, in smoke_load_data_1 NameError: name 'fluid_data_dict_final_s1' is not defined Traceback (most recent call last): File "<string>", line 1, in <module> TypeError: 'NoneType' object is not callable ``` I can't really tell, if i'm doing something wrong, or if it is some kind of bug, but when using blender as a python module, i cannot render any fluid sims, they just disappear in the render output. I found that someone had a similar issue on devtalk, but the topic was not continued: [Devtalk: 15460 ](https://devtalk.blender.org/t/python-module-bpy-mantaflow-issues-after-successful-build/15460) When using blender normally in background mode, i am able to render it, but still, the error exists in both cases, the second one only when using as a python module, can't really tell if they are related.

Robin Schyboll commented

2021-04-26 14:21:19 +02:00

Added subscriber: @hoodrobinrs

Ankit Meel commented

2021-06-24 14:52:15 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Ankit Meel commented

2021-06-24 14:54:08 +02:00

Added subscriber: @ankitm

Ankit Meel commented

2021-06-24 14:54:08 +02:00

Before I got the 'Manta::Error', there was an assert (stack in F10194218) so after disabling WITH_ASSERT_ABORT, the issue can be redone.

Before I got the `'Manta::Error'`, there was an assert (stack in [F10194218](https://archive.blender.org/developer/F10194218/T87828_assertandexception.txt)) so after disabling `WITH_ASSERT_ABORT`, the issue can be redone.

Dalai Felinto commented

2022-05-09 10:59:22 +02:00

Mantaflow (fluid simulator) has no active developer at the moment. Moving those reports as known issues so at least other users can find their issues already reported.