Crash: Particle Hair Children Viewport Visibility #65246

New Issue

Tristan Sach · 2019-05-28T22:53:55+02:00

Tristan Sach commented

2019-05-28 22:53:55 +02:00

System Information
Operating system: Windows 10
Graphics card: GTX 1070

Blender Version
Broken: version: 2.80 (sub 72), branch: blender2.7, commit date: 2019-05-27 19:48, hash: 89207df722, type: Release
Worked: 2.79b

Short description of error
Blender crashes when in particle edit mode with children hair particles enabled in the viewport and try to hide a second or duplicated particle system.

Two slightly different methods to reproduce the error:

Method 1 - Two Unique Hair Particle Systems

Open blender, new general cube file, cube selected.

In properties editor:
2. Go to particle systems for cube.
3. Add a new particle system.
4. Set the particle system to hair.
5. Set the children to simple.
6. Add another new particle system with hair and simple children just like the first.

In 3D viewport editor:
7. Go to particle edit mode.
8. Go to tool options > viewport display > check the box for children.

In properties editor:
9. Toggle off the display in viewport button for the second particle system.

Crash

Method 2 - Duplicated Hair Particle System

Open blender, new general cube file, cube selected.

In properties editor:
2. Go to particle systems for cube.
3. Add a new particle system.
4. Set the particle system to hair.
5. Set the children to simple.
6. Duplicate the particle system.

In 3D viewport editor:
7. Go to particle edit mode.
8. Go to tool options > viewport display > check the box for children.

In properties editor:
9. Toggle off the display in viewport button for the first particle system.

Crash

Other notes

If you are in object mode when turning off the viewport visibility for the particle system, it will not crash. However, going back into particle edit mode will cause both particle systems to be hidden despite one still being set to visible.

Testing files
method-1.blend - Toggle the display in viewport button for the second particle system. Should immediately crash.

blender28-hair-particles-crash-method-1.blend

method-2.blend - Toggle the display in viewport button for the first particle system. Should immediately crash.

blender28-hair-particles-crash-method-2.blend

**System Information** Operating system: Windows 10 Graphics card: GTX 1070 **Blender Version** Broken: version: 2.80 (sub 72), branch: blender2.7, commit date: 2019-05-27 19:48, hash: 89207df7222a, type: Release Worked: 2.79b **Short description of error** Blender crashes when in particle edit mode with children hair particles enabled in the viewport and try to hide a second or duplicated particle system. Two slightly different methods to reproduce the error: **Method 1 - Two Unique Hair Particle Systems** 1. Open blender, new general cube file, cube selected. In properties editor: 2. Go to particle systems for cube. 3. Add a new particle system. 4. Set the particle system to hair. 5. Set the children to simple. 6. Add another new particle system with hair and simple children just like the first. In 3D viewport editor: 7. Go to particle edit mode. 8. Go to tool options > viewport display > check the box for children. In properties editor: 9. Toggle off the display in viewport button for the second particle system. Crash **Method 2 - Duplicated Hair Particle System** 1. Open blender, new general cube file, cube selected. In properties editor: 2. Go to particle systems for cube. 3. Add a new particle system. 4. Set the particle system to hair. 5. Set the children to simple. 6. Duplicate the particle system. In 3D viewport editor: 7. Go to particle edit mode. 8. Go to tool options > viewport display > check the box for children. In properties editor: 9. Toggle off the display in viewport button for the first particle system. Crash **Other notes** If you are in object mode when turning off the viewport visibility for the particle system, it will not crash. However, going back into particle edit mode will cause both particle systems to be hidden despite one still being set to visible. **Testing files** method-1.blend - Toggle the display in viewport button for the second particle system. Should immediately crash. [blender28-hair-particles-crash-method-1.blend](https://archive.blender.org/developer/F7076795/blender28-hair-particles-crash-method-1.blend) method-2.blend - Toggle the display in viewport button for the first particle system. Should immediately crash. [blender28-hair-particles-crash-method-2.blend](https://archive.blender.org/developer/F7076798/blender28-hair-particles-crash-method-2.blend)

Tristan Sach commented

2019-05-28 22:53:55 +02:00

Added subscriber: @pancake_hunter

Sebastian Parborg commented

2019-06-13 14:42:57 +02:00

Added subscriber: @ZedDB

Sergey Sharybin was assigned by Sebastian Parborg

2019-06-13 14:42:57 +02:00

Sebastian Parborg commented

2019-06-13 14:42:57 +02:00

I can reproduce the crash in the method 1 file but toggling on and off the "display in viewport" setting for both particle systems a couple of times:

Thread 29 "blender" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffd7ffb700 (LWP 9263)]
0x0000555557d8f3b5 in psys_thread_create_path (task=0x7fffd3295828, cpa=0x7fffce80ae08, child_keys=0x7fffce6eada8, i=312)
    at /home/zed/prog/blender/source/blender/blenkernel/intern/particle.c:2565
2565	    if (cpa_num > ctx->sim.psmd->mesh_final->totface) {
(gdb) bt
#0  0x0000555557d8f3b5 in psys_thread_create_path (task=0x7fffd3295828, cpa=0x7fffce80ae08, child_keys=0x7fffce6eada8, i=312)
    at /home/zed/prog/blender/source/blender/blenkernel/intern/particle.c:2565
#1  0x0000555557d90026 in exec_child_path_cache (UNUSED_pool=0x7fffcb924008, taskdata=0x7fffd3295828, UNUSED_threadid=5)
    at /home/zed/prog/blender/source/blender/blenkernel/intern/particle.c:2751
- 2  0x0000555557f8a41e in task_scheduler_thread_run (thread_p=0x7fffdbdaf8f8) at /home/zed/prog/blender/source/blender/blenlib/intern/task.c:450
- 3  0x00007ffff6a0a458 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff326f71f in clone () from /lib64/libc.so.6

I can reproduce the crash in the `method 1` file but toggling on and off the "display in viewport" setting for both particle systems a couple of times: ``` Thread 29 "blender" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fffd7ffb700 (LWP 9263)] 0x0000555557d8f3b5 in psys_thread_create_path (task=0x7fffd3295828, cpa=0x7fffce80ae08, child_keys=0x7fffce6eada8, i=312) at /home/zed/prog/blender/source/blender/blenkernel/intern/particle.c:2565 2565 if (cpa_num > ctx->sim.psmd->mesh_final->totface) { (gdb) bt #0 0x0000555557d8f3b5 in psys_thread_create_path (task=0x7fffd3295828, cpa=0x7fffce80ae08, child_keys=0x7fffce6eada8, i=312) at /home/zed/prog/blender/source/blender/blenkernel/intern/particle.c:2565 #1 0x0000555557d90026 in exec_child_path_cache (UNUSED_pool=0x7fffcb924008, taskdata=0x7fffd3295828, UNUSED_threadid=5) at /home/zed/prog/blender/source/blender/blenkernel/intern/particle.c:2751 - 2 0x0000555557f8a41e in task_scheduler_thread_run (thread_p=0x7fffdbdaf8f8) at /home/zed/prog/blender/source/blender/blenlib/intern/task.c:450 - 3 0x00007ffff6a0a458 in start_thread () from /lib64/libpthread.so.0 #4 0x00007ffff326f71f in clone () from /lib64/libc.so.6 ```

Sergey Sharybin commented

2019-07-04 10:42:25 +02:00

Closed as duplicate of #63788

Sergey Sharybin closed this issue

2019-07-04 10:42:25 +02:00

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Crash: Particle Hair Children Viewport Visibility #65246