Crash when moving, rotating an object with Soft Body physics enabled (not baked) #58050

New Issue

Nicola De Mitri · 2018-11-25T13:58:23+01:00

Nicola De Mitri commented

2018-11-25 13:58:23 +01:00

System Information
Ubuntu 18.04
Intel® Core™ i5-6200U CPU @ 2.30GHz × 4 / Intel® HD Graphics 520 (Skylake GT2)

Blender Version
Broken: 2.80 2018-11-24 22:44, (a2e209f20a), also the previous day build

Short description of error
I have a simple file with 3 object, on which I have enabled (but not baked) Soft Body Physics.

Selecting one of these objects, and attempting a single operation (e.g. Move, Rotate, or change to Edit Mode) causes a creash

Exact steps for others to reproduce the error

Open attached .blend
Select the lowermost rounded cube
"G" or "R" then move the mouse, or just "Tab"
soft_body_crash.blend

**System Information** Ubuntu 18.04 Intel® Core™ i5-6200U CPU @ 2.30GHz × 4 / Intel® HD Graphics 520 (Skylake GT2) **Blender Version** Broken: 2.80 2018-11-24 22:44, (a2e209f20a4), also the previous day build **Short description of error** I have a simple file with 3 object, on which I have enabled (but not baked) Soft Body Physics. Selecting one of these objects, and attempting a single operation (e.g. Move, Rotate, or change to Edit Mode) causes a creash **Exact steps for others to reproduce the error** - Open attached .blend - Select the lowermost rounded cube - "G" or "R" then move the mouse, or just "Tab" [soft_body_crash.blend](https://archive.blender.org/developer/F5714033/soft_body_crash.blend)

Nicola De Mitri commented

2018-11-25 13:58:23 +01:00

Added subscriber: @NicolaSap

Nicola De Mitri changed title from ~~Crash when moving~~ to Crash when moving, rotating an object with Soft Body physics enabled (not baked)

2018-11-25 14:28:51 +01:00

Philipp Oeser commented

2018-11-27 14:08:52 +01:00

Added subscribers: @Sergey, @lichtwerk

Sergey Sharybin was assigned by Philipp Oeser

2018-11-27 14:08:52 +01:00

Philipp Oeser commented

2018-11-27 14:08:52 +01:00

Crash confirmed.

Seems to be some race condition, because --threads 1 commandline option will prevent the crash.

getting this on file read

Dependency cycle detected:
  'OBCube.GEOMETRY_UBEREVAL()' depends on 'OBCube.001.GEOMETRY_UBEREVAL()' through 'Softbody Collision'
  'OBCube.001.GEOMETRY_UBEREVAL()' depends on 'OBCube.GEOMETRY_UBEREVAL()' through 'Softbody Collision'
Dependency cycle detected:
  'OBCube.GEOMETRY_UBEREVAL()' depends on 'OBCube.PLACEHOLDER(Eval Init)' through 'Object Geometry UberEval'
  'OBCube.PLACEHOLDER(Eval Init)' depends on 'OBCube.POINT_CACHE_RESET()' through 'Point Cache -> Geometry'
  'OBCube.POINT_CACHE_RESET()' depends on 'OBCube.001.GEOMETRY_UBEREVAL()' through 'Point Cache'
  'OBCube.001.GEOMETRY_UBEREVAL()' depends on 'OBCube.GEOMETRY_UBEREVAL()' through 'Softbody Collision'
Detected 2 dependency cycles

2.79 survived this btw, puts out a little less in this case:

Dependency cycle detected:
  'OBCube.GEOMETRY_UBEREVAL()' depends on 'OBCube.001.GEOMETRY_UBEREVAL()' through 'Softbody Collision'
  'OBCube.001.GEOMETRY_UBEREVAL()' depends on 'OBCube.GEOMETRY_UBEREVAL()' through 'Softbody Collision'

debug-depsgraph (right before crash):

deg_graph_id_tag_update: id=OBCube flags=TRANSFORM
deg_graph_id_tag_update: id=OBCube flags=TRANSFORM
[SCScene :: View Layer]: Operation is entry point for update: COPY_ON_WRITE()
[SCScene :: View Layer]: Operation is entry point for update: TRANSFORM_LOCAL()
[SCScene :: View Layer]: Operation is entry point for update: TRANSFORM_OBJECT_UBEREVAL()
[SCScene :: View Layer]: Operation is entry point for update: TRANSFORM_FINAL()
[SCScene :: View Layer]: Operation is entry point for update: POINT_CACHE_RESET()
[SCScene :: View Layer]: Accumulated recalc bits for OBCube: 113
[SCScene :: View Layer]: Accumulated recalc bits for OBCube.001: 16
[SCScene :: View Layer]: deg_evaluate_copy_on_write on OBCube (0x7f3fbb1be808)
[SCScene :: View Layer]: BKE_object_eval_uber_data on OBCube (0x7f3fbb1be808)
[SCScene :: View Layer]: BKE_object_handle_data_update on OBCube (0x7f3fbb1be808)
[SCScene :: View Layer]: BKE_object_eval_local_transform on OBCube (0x7f3fbb1be808)
[SCScene :: View Layer]: BKE_object_eval_transform_final on OBCube (0x7f3fbb1be808)
./bin/blender(BLI_system_backtrace+0x26) [0x2ee4e65]

crash

1   mesh_calc_modifiers			DerivedMesh.c     1167 0x2987b1c 
2   mesh_build_data			DerivedMesh.c     2010 0x298aac8 
3   makeDerivedMesh 			DerivedMesh.c     2120 0x298ade3 
4   BKE_object_handle_data_update	object_update.c   205  0x2b1b8b1 
5   BKE_object_eval_uber_data 		object_update.c   348  0x2b1bfae

where ob->data is corrupted.

ASAN gives me nothing.

@Sergey: one for your desk?

Crash confirmed. Seems to be some race condition, because `--threads 1` commandline option will prevent the crash. getting this on file read ``` Dependency cycle detected: 'OBCube.GEOMETRY_UBEREVAL()' depends on 'OBCube.001.GEOMETRY_UBEREVAL()' through 'Softbody Collision' 'OBCube.001.GEOMETRY_UBEREVAL()' depends on 'OBCube.GEOMETRY_UBEREVAL()' through 'Softbody Collision' Dependency cycle detected: 'OBCube.GEOMETRY_UBEREVAL()' depends on 'OBCube.PLACEHOLDER(Eval Init)' through 'Object Geometry UberEval' 'OBCube.PLACEHOLDER(Eval Init)' depends on 'OBCube.POINT_CACHE_RESET()' through 'Point Cache -> Geometry' 'OBCube.POINT_CACHE_RESET()' depends on 'OBCube.001.GEOMETRY_UBEREVAL()' through 'Point Cache' 'OBCube.001.GEOMETRY_UBEREVAL()' depends on 'OBCube.GEOMETRY_UBEREVAL()' through 'Softbody Collision' Detected 2 dependency cycles ``` 2.79 survived this btw, puts out a little less in this case: ``` Dependency cycle detected: 'OBCube.GEOMETRY_UBEREVAL()' depends on 'OBCube.001.GEOMETRY_UBEREVAL()' through 'Softbody Collision' 'OBCube.001.GEOMETRY_UBEREVAL()' depends on 'OBCube.GEOMETRY_UBEREVAL()' through 'Softbody Collision' ``` - debug-depsgraph (right before crash): ``` deg_graph_id_tag_update: id=OBCube flags=TRANSFORM deg_graph_id_tag_update: id=OBCube flags=TRANSFORM [SCScene :: View Layer]: Operation is entry point for update: COPY_ON_WRITE() [SCScene :: View Layer]: Operation is entry point for update: TRANSFORM_LOCAL() [SCScene :: View Layer]: Operation is entry point for update: TRANSFORM_OBJECT_UBEREVAL() [SCScene :: View Layer]: Operation is entry point for update: TRANSFORM_FINAL() [SCScene :: View Layer]: Operation is entry point for update: POINT_CACHE_RESET() [SCScene :: View Layer]: Accumulated recalc bits for OBCube: 113 [SCScene :: View Layer]: Accumulated recalc bits for OBCube.001: 16 [SCScene :: View Layer]: deg_evaluate_copy_on_write on OBCube (0x7f3fbb1be808) [SCScene :: View Layer]: BKE_object_eval_uber_data on OBCube (0x7f3fbb1be808) [SCScene :: View Layer]: BKE_object_handle_data_update on OBCube (0x7f3fbb1be808) [SCScene :: View Layer]: BKE_object_eval_local_transform on OBCube (0x7f3fbb1be808) [SCScene :: View Layer]: BKE_object_eval_transform_final on OBCube (0x7f3fbb1be808) ./bin/blender(BLI_system_backtrace+0x26) [0x2ee4e65] ``` crash ``` 1 mesh_calc_modifiers DerivedMesh.c 1167 0x2987b1c 2 mesh_build_data DerivedMesh.c 2010 0x298aac8 3 makeDerivedMesh DerivedMesh.c 2120 0x298ade3 4 BKE_object_handle_data_update object_update.c 205 0x2b1b8b1 5 BKE_object_eval_uber_data object_update.c 348 0x2b1bfae ``` where `ob->data` is corrupted. ASAN gives me nothing. @Sergey: one for your desk?

Nicola De Mitri commented

2018-12-04 11:36:00 +01:00

This appears to be a more general issue with Soft Body than just the file provided.

Creating a scene with (collision-enabled) soft bodies, saving and reopening it, and attempting to edit some properties, very easily results in a crash.

Still happening with the Beta: 63ac7c799c

This appears to be a more general issue with Soft Body than just the file provided. Creating a scene with (collision-enabled) soft bodies, saving and reopening it, and attempting to edit some properties, very easily results in a crash. Still happening with the Beta: 63ac7c799c8

Sergey Sharybin commented

2018-12-06 15:37:16 +01:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2018-12-06 15:37:16 +01:00

Sergey Sharybin commented

2018-12-06 15:37:16 +01:00

The crash has been resolved by b97cd0e690. The cycle is still there, but doesn't seem affecting stability and there is no clear way of solving it from the dependency graph side.

SO thanks for the report, considering it solved now! :)

The crash has been resolved by b97cd0e690. The cycle is still there, but doesn't seem affecting stability and there is no clear way of solving it from the dependency graph side. SO thanks for the report, considering it solved now! :)

Nicola De Mitri commented

2018-12-06 16:32:37 +01:00

Thanks! I haven't tried it yet but I trust you guys on the status change :)

As for the cycle: is it really an issue at present? The best way I know to make soft bodies interact with each other is to enable Soft Body and Collision (in that order) for each one of them, and every one seems to affect every other one correctly. I used to think that it works precisely because a cycle exists and is handled correctly.

Sorry for going off-topic, thanks again.

Thanks! I haven't tried it yet but I trust you guys on the status change :) As for the cycle: is it really an issue at present? The best way I know to make soft bodies interact with each other is to enable Soft Body and Collision (in that order) for each one of them, and every one seems to affect every other one correctly. I used to think that it works precisely *because* a cycle exists and is handled correctly. Sorry for going off-topic, thanks again.

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Crash when moving, rotating an object with Soft Body physics enabled (not baked) #58050