Skin Modifier Resize Crash #52353

New Issue

Brandon Griffin · 2017-08-11T14:33:20+02:00

Brandon Griffin commented

2017-08-11 14:33:20 +02:00

System Information
Processor: 8x Intel(R) Core(TM) i7-3770 CPU@3.40GHz
Memory: 16363MB
Operation System: Linux Mint 18.1 Serena
Video: EVGA GeForce GTX 1050 Ti SSC GAMING ACX 3.0, 04G-P4-6255-KR, 4GB GDDR5, DX12 OSD Support (PXOC)

Blender Version
Broken: 2.78.5 16eca8f
Broken: 2.8 a3d9ef2ea5

Short description of error
The attached file contains an object created from a skin modifier and a mirror modifier (base.body), and several objects laid over the base.body that are using a shrinkwrap modifier (base.clothing.pants, base.clothing.shirt). While attempting to resize one of the skin vertices in base.body, Blender will raise a Segmentation Fault. I posit that the crash is caused by the skin modifier intersecting an object that is shrinkwrapped over the skin itself.

Sometimes, though less commonly, simply entering edit mode on base.body is sufficient to cause a crash.

Hiding the shrinkwrapped objects is not sufficient to prevent the crash. Disabling the shrinkwrap modifier on those objects does prevent the crash.

Exact steps for others to reproduce the error

Select the object base.body and tab into edit mode. (Sometimes this will trigger a crash.)
Select the vertex second from the bottom of the leg.
Resize the vertex (Ctrl-A). Crash will occur as the vertex is expanded.

After restart, disable the shrinkwrap modifiers on base.clothing.pants and base.clothing.shirt and try again. Crash will not occur.try.female.2.blend

Crash Report

Blender 2.78 (sub 5), Commit date: 2017-06-28 11:21, Hash `16eca8f`

bpy.ops.object.editmode_toggle() # Operator
bpy.ops.transform.skin_resize(value=(1.47227, 1.47227, 1.47227), constraint_axis=(False, False, False), constraint_orientation='LOCAL', mirror=False, proportional='DISABLED', proportional_edit_falloff='SMOOTH', proportional_size=0.092296) # Operator

backtrace

./build_linux/bin/blender(BLI_system_backtrace+0x30) [0x13f1010]
./build_linux/bin/blender() [0xa228c1]
/lib/x86_64-linux-gnu/libc.so.6(+0x354b0) [0x7faf7b2d24b0]
./build_linux/bin/blender() [0x10c03af]
./build_linux/bin/blender() [0x13abf6a]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender() [0x13abffc]
./build_linux/bin/blender(BLI_bvhtree_find_nearest+0x17b) [0x13acf7b]
./build_linux/bin/blender() [0x11e7b65]
./build_linux/bin/blender() [0x13f209a]
./build_linux/bin/blender(BLI_task_parallel_range_ex+0x1c) [0x13f274c]
./build_linux/bin/blender(shrinkwrapModifier_deform+0x355) [0x11e88d5]
./build_linux/bin/blender() [0x10a2362]
./build_linux/bin/blender() [0x10a2d4c]
./build_linux/bin/blender(makeDerivedMesh+0x8d) [0x10a2e6d]
./build_linux/bin/blender(BKE_object_handle_data_update+0x4a5) [0x11982c5]
./build_linux/bin/blender(BKE_object_handle_update_ex+0x200) [0x1192530]
./build_linux/bin/blender() [0x11cf7f6]
./build_linux/bin/blender() [0x13f12d0]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba) [0x7faf810e16ba]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7faf7b3a382d]

**System Information** Processor: 8x Intel(R) Core(TM) i7-3770 CPU@3.40GHz Memory: 16363MB Operation System: Linux Mint 18.1 Serena Video: EVGA GeForce GTX 1050 Ti SSC GAMING ACX 3.0, 04G-[P4](https://archive.blender.org/developer/P4.txt)-6255-KR, 4GB GDDR5, DX12 OSD Support (PXOC) **Blender Version** Broken: 2.78.5 16eca8f Broken: 2.8 a3d9ef2ea5 **Short description of error** The attached file contains an object created from a skin modifier and a mirror modifier (base.body), and several objects laid over the base.body that are using a shrinkwrap modifier (base.clothing.pants, base.clothing.shirt). While attempting to resize one of the skin vertices in base.body, Blender will raise a Segmentation Fault. I posit that the crash is caused by the skin modifier intersecting an object that is shrinkwrapped over the skin itself. Sometimes, though less commonly, simply entering edit mode on base.body is sufficient to cause a crash. Hiding the shrinkwrapped objects is not sufficient to prevent the crash. Disabling the shrinkwrap modifier on those objects does prevent the crash. **Exact steps for others to reproduce the error** 1) Select the object base.body and tab into edit mode. (Sometimes this will trigger a crash.) 2) Select the vertex second from the bottom of the leg. 3) Resize the vertex (Ctrl-A). Crash will occur as the vertex is expanded. After restart, disable the shrinkwrap modifiers on base.clothing.pants and base.clothing.shirt and try again. Crash will not occur.[try.female.2.blend](https://archive.blender.org/developer/F706644/try.female.2.blend) **Crash Report** # Blender 2.78 (sub 5), Commit date: 2017-06-28 11:21, Hash 16eca8f bpy.ops.object.editmode_toggle() # Operator bpy.ops.transform.skin_resize(value=(1.47227, 1.47227, 1.47227), constraint_axis=(False, False, False), constraint_orientation='LOCAL', mirror=False, proportional='DISABLED', proportional_edit_falloff='SMOOTH', proportional_size=0.092296) # Operator # backtrace ./build_linux/bin/blender(BLI_system_backtrace+0x30) [0x13f1010] ./build_linux/bin/blender() [0xa228c1] /lib/x86_64-linux-gnu/libc.so.6(+0x354b0) [0x7faf7b2d24b0] ./build_linux/bin/blender() [0x10c03af] ./build_linux/bin/blender() [0x13abf6a] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender() [0x13abffc] ./build_linux/bin/blender(BLI_bvhtree_find_nearest+0x17b) [0x13acf7b] ./build_linux/bin/blender() [0x11e7b65] ./build_linux/bin/blender() [0x13f209a] ./build_linux/bin/blender(BLI_task_parallel_range_ex+0x1c) [0x13f274c] ./build_linux/bin/blender(shrinkwrapModifier_deform+0x355) [0x11e88d5] ./build_linux/bin/blender() [0x10a2362] ./build_linux/bin/blender() [0x10a2d4c] ./build_linux/bin/blender(makeDerivedMesh+0x8d) [0x10a2e6d] ./build_linux/bin/blender(BKE_object_handle_data_update+0x4a5) [0x11982c5] ./build_linux/bin/blender(BKE_object_handle_update_ex+0x200) [0x1192530] ./build_linux/bin/blender() [0x11cf7f6] ./build_linux/bin/blender() [0x13f12d0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba) [0x7faf810e16ba] /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7faf7b3a382d]

Brandon Griffin commented

2017-08-11 14:33:20 +02:00

Changed status to: 'Open'

Brandon Griffin commented

2017-08-11 14:33:20 +02:00

Added subscriber: @BrandonGriffin

Bastien Montagne commented

2017-08-11 15:24:45 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2017-08-11 15:24:46 +02:00

This actually same issue as in #52149, will merge.

Bastien Montagne commented

2017-08-11 15:25:09 +02:00

Closed as duplicate of #52149

Bastien Montagne closed this issue

2017-08-11 15:25:09 +02:00

Brandon Griffin commented

2017-08-12 01:57:31 +02:00

#52149 doesn't seem to cover step 3: Resize the vertex (Ctrl-A). Crash will occur as the vertex is expanded.

The crash bug reported in Step 3 is after successfully entering edit mode, and is 100% repeatable (unlike the race condition reported in #52149).

#52149 doesn't seem to cover step 3: Resize the vertex (Ctrl-A). Crash will occur as the vertex is expanded. The crash bug reported in Step 3 is after successfully entering edit mode, and is 100% repeatable (unlike the race condition reported in #52149).

Bastien Montagne commented

2017-08-12 08:58:21 +02:00

For me, crash was 100% happening just by entering Edit mode, so can’t certify 100% the one from scaling vert was the same - but it does not happens fro me now with fixed code, so would assume it was as well. Technically, scaling the vertex was merely re-running same crashing code as when entering Edit mode, over and over - so obviously crash was more likely to happen there (since in a release build, invalid memory access do not always crash…).

For me, crash was 100% happening just by entering Edit mode, so can’t certify 100% the one from scaling vert was the same - but it does not happens fro me now with fixed code, so would assume it was as well. Technically, scaling the vertex was merely re-running same crashing code as when entering Edit mode, over and over - so obviously crash was more likely to happen there (since in a release build, invalid memory access do not *always* crash…).

Brandon Griffin commented

2017-08-12 14:18:50 +02:00

Thank you Bastien.

I just built a4bcdf5 (2.79 release candidate) and verified that the bug is fixed in that version. It's cool to watch the shrink-wrapped object grow with the skin modifier.

The Blender team is awesome!

Thank you Bastien. I just built a4bcdf5 (2.79 release candidate) and verified that the bug is fixed in that version. It's cool to watch the shrink-wrapped object grow with the skin modifier. The Blender team is awesome!

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Skin Modifier Resize Crash #52353

Blender 2.78 (sub 5), Commit date: 2017-06-28 11:21, Hash 16eca8f

backtrace

Blender 2.78 (sub 5), Commit date: 2017-06-28 11:21, Hash `16eca8f`