bpy.ops.sculpt.dynamic_topology_toggle causes a SegFault from Python in background mode #71605

New Issue

Loïc Norgeot · 2019-11-15T11:41:34+01:00

Loïc Norgeot commented

2019-11-15 11:41:34 +01:00

System Information
Operating system: Linux-5.0.0-32-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.116

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-14 09:40, hash: c25a910e4e
Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-11-14 23:23, hash: 96ce32dca6
Worked: version: 2.79 (sub 0), branch: master, commit date: 2017-09-11 10:43, hash: 5bd8ac9abf, type: Release

Short description of error
With SCULPT mode and DynTopo activated, toggling DynTopo from a Python script works from the UI, but segfaults when ran in background.

Exact steps for others to reproduce the error

Open the default startup file
With the cube selected, toggle Sculpt mode
Turn on Dyntopo in the Active Tool settings
Save the .blend file in this state
Run the attached python script on the .blend with the UI: should open the file and switch to object mode.
Run the attached python script on the .blend in background mode: Segfault when trying to toggle Dyntopo

blender file.blend -P getoutofsculptmode.py     -> OK
blender file.blend -b -P getoutofsculptmode.py  -> SegFault

Attached files

.py script
default .blend file saved in sculpt mode with Dyntopo
backtrace (/tmp/file.crash.txt, same for all the versions tested)

sculpt_segfault.blend

getoutofsculptmode.py

sculpt_segfault.crash.txt

**System Information** Operating system: Linux-5.0.0-32-generic-x86_64-with-debian-buster-sid 64 Bits Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.116 **Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: `f6cb5f5449` Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-14 09:40, hash: `c25a910e4e` Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-11-14 23:23, hash: `96ce32dca6` Worked: version: 2.79 (sub 0), branch: master, commit date: 2017-09-11 10:43, hash: 5bd8ac9abfa, type: Release **Short description of error** With SCULPT mode and DynTopo activated, toggling DynTopo from a Python script works from the UI, but segfaults when ran in background. **Exact steps for others to reproduce the error** - Open the default startup file - With the cube selected, toggle Sculpt mode - Turn on Dyntopo in the Active Tool settings - Save the .blend file in this state - Run the attached python script on the .blend with the UI: should open the file and switch to object mode. - Run the attached python script on the .blend in background mode: Segfault when trying to toggle Dyntopo ``` blender file.blend -P getoutofsculptmode.py -> OK blender file.blend -b -P getoutofsculptmode.py -> SegFault ``` **Attached files** - .py script - default .blend file saved in sculpt mode with Dyntopo - backtrace (/tmp/file.crash.txt, same for all the versions tested) [sculpt_segfault.blend](https://archive.blender.org/developer/F8089592/sculpt_segfault.blend) [getoutofsculptmode.py](https://archive.blender.org/developer/F8089594/getoutofsculptmode.py) [sculpt_segfault.crash.txt](https://archive.blender.org/developer/F8089596/sculpt_segfault.crash.txt)

Loïc Norgeot commented

2019-11-15 11:41:34 +01:00

Added subscriber: @Loic-Norgeot

Jacques Lucke commented

2020-01-08 16:16:23 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-01-08 16:16:23 +01:00

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

Jacques Lucke commented

2020-01-08 16:16:23 +01:00

In a debug build it actually crashes in both cases.

libc.so.6!__GI_raise(...) (/build/glibc-4WA41p/glibc-2.30/sysdeps/unix/sysv/linux/raise.c:50)
libc.so.6!__GI_abort(...) (/build/glibc-4WA41p/glibc-2.30/stdlib/abort.c:79)
BKE_undosys_step_push_init_with_type(...) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/undo_system.c:457)
sculpt_undo_push_begin(...) (/home/jacques/blender-git/blender/source/blender/editors/sculpt_paint/sculpt_undo.c:1114)
sculpt_dynamic_topology_disable_with_undo(...) (/home/jacques/blender-git/blender/source/blender/editors/sculpt_paint/sculpt.c:8124)
ED_object_sculptmode_exit_ex(...) (/home/jacques/blender-git/blender/source/blender/editors/sculpt_paint/sculpt.c:8612)
sculpt_mode_toggle_exec(...) (/home/jacques/blender-git/blender/source/blender/editors/sculpt_paint/sculpt.c:8660)
wm_operator_invoke(...) (/home/jacques/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1453)
wm_operator_call_internal(...) (/home/jacques/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1688)
WM_operator_call_py(...) (/home/jacques/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1788)
...

/* We could detect and clean this up (but it should never happen!). */
BLI_assert(ustack->step_init == NULL);

In a debug build it actually crashes in both cases. ``` libc.so.6!__GI_raise(...) (/build/glibc-4WA41p/glibc-2.30/sysdeps/unix/sysv/linux/raise.c:50) libc.so.6!__GI_abort(...) (/build/glibc-4WA41p/glibc-2.30/stdlib/abort.c:79) BKE_undosys_step_push_init_with_type(...) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/undo_system.c:457) sculpt_undo_push_begin(...) (/home/jacques/blender-git/blender/source/blender/editors/sculpt_paint/sculpt_undo.c:1114) sculpt_dynamic_topology_disable_with_undo(...) (/home/jacques/blender-git/blender/source/blender/editors/sculpt_paint/sculpt.c:8124) ED_object_sculptmode_exit_ex(...) (/home/jacques/blender-git/blender/source/blender/editors/sculpt_paint/sculpt.c:8612) sculpt_mode_toggle_exec(...) (/home/jacques/blender-git/blender/source/blender/editors/sculpt_paint/sculpt.c:8660) wm_operator_invoke(...) (/home/jacques/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1453) wm_operator_call_internal(...) (/home/jacques/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1688) WM_operator_call_py(...) (/home/jacques/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1788) ... ``` ``` /* We could detect and clean this up (but it should never happen!). */ BLI_assert(ustack->step_init == NULL); ```

blender-admin commented

2020-09-12 05:38:12 +02:00

This issue was referenced by ad5f1d0231

This issue was referenced by ad5f1d02318a30c545196f124e30504615294416

Campbell Barton commented

2020-09-12 05:43:23 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2020-09-12 05:43:23 +02:00

Campbell Barton self-assigned this 2020-09-12 05:43:23 +02:00

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bpy.ops.sculpt.dynamic_topology_toggle causes a SegFault from Python in background mode #71605