Blender crash when enabling OpenSubdiv #52059

New Issue

¿? · 2017-07-14T18:25:47+02:00

¿? commented

2017-07-14 18:25:47 +02:00

Window 7 64-bit, GTX 770 OC

Hash: 29ec0b1 (Date: 2017-07-11)

When enabling OpenSubdiv, Blender just crashes with: [Error: EXCEPTION_ACCESS_VIOLATION] in the console
Steps to Reproduce: Open the included file, then enable [Use OpenSubdiv] untitled.blend (note: model is nsfw/nude)

Sometimes it works by doing that but if you disable then re-enable OpenSubdiv a few times, it'll crash. It started (and often) crashing on my first try,
I think it crashes more frequently with new-depsgraph enabled but it also happens without it, so that's not a direct factor of the issue.

Window 7 64-bit, GTX 770 OC Hash: 29ec0b1 (Date: 2017-07-11) When enabling OpenSubdiv, Blender just crashes with: [Error: EXCEPTION_ACCESS_VIOLATION] in the console Steps to Reproduce: Open the included file, then enable [Use OpenSubdiv] [untitled.blend](https://archive.blender.org/developer/F667185/untitled.blend) (note: model is nsfw/nude) Sometimes it works by doing that but if you disable then re-enable OpenSubdiv a few times, it'll crash. It started (and often) crashing on my first try, I think it crashes more frequently with new-depsgraph enabled but it also happens without it, so that's not a direct factor of the issue.

¿? commented

2017-07-14 18:25:47 +02:00

Changed status to: 'Open'

¿? commented

2017-07-14 18:25:47 +02:00

Added subscriber: @Ebone

Fable Fox commented

2017-07-15 13:07:07 +02:00

Added subscriber: @fablefox

Fable Fox commented

2017-07-15 13:07:07 +02:00

Was crash log generated? Please upload if it does. Thanks.
https://docs.blender.org/manual/en/dev/troubleshooting/crash.html

Also, launch Blender from the command line with -d option and attach as text file here any error printed out in the console (do not paste it directly in comment).

Was crash log generated? Please upload if it does. Thanks. https://docs.blender.org/manual/en/dev/troubleshooting/crash.html Also, launch Blender from the command line with -d option and attach as text file here any error printed out in the console (do not paste it directly in comment).

¿? commented

2017-07-15 14:42:05 +02:00

I never get any crash logs; I'm not sure what -d is supposed to be doing but the only text I can apparently get comes from the command prompt, and since it gets too full to hold everything and doesn't auto-save anything, the text that I can select+copy is limited.
Unless I'm supposed to use it some other way. Here's the log before crash:
log.txt

Here's the log when starting with -d (at least as much as I can get)
available -d.txt

This time, it wouldn't crash whilst enabling/disabling OpenSubdiv, but it did after cycling through level 1-3 with it enabled.

I never get any crash logs; I'm not sure what -d is supposed to be doing but the only text I can apparently get comes from the command prompt, and since it gets too full to hold everything and doesn't auto-save anything, the text that I can select+copy is limited. Unless I'm supposed to use it some other way. Here's the log before crash: [log.txt](https://archive.blender.org/developer/F668207/log.txt) Here's the log when starting with -d (at least as much as I can get) [available -d.txt](https://archive.blender.org/developer/F668208/available_-d.txt) This time, it wouldn't crash whilst enabling/disabling OpenSubdiv, but it did after cycling through level 1-3 with it enabled.

Sergey Sharybin was assigned by Aaron Carlisle

2017-07-17 00:39:55 +02:00

Sergey Sharybin commented

2017-07-27 10:55:35 +02:00

Developer note

The issue is caused by some code in face-varying logic which doesn't handle special cases of non-manifold meshes correctly, causing reading past the array size. Here is a simplified file which demonstrates the issue: untitled_simple.blend.

The issue is visible on Linux when OSD is compiled with ASAN.

Not sure yet whether it's issue in how we order the loops when passing to OSD or if it's an issue on OSD side.

Developer note The issue is caused by some code in face-varying logic which doesn't handle special cases of non-manifold meshes correctly, causing reading past the array size. Here is a simplified file which demonstrates the issue: [untitled_simple.blend](https://archive.blender.org/developer/F680618/untitled_simple.blend). The issue is visible on Linux when OSD is compiled with ASAN. Not sure yet whether it's issue in how we order the loops when passing to OSD or if it's an issue on OSD side.

Sergey Sharybin commented

2018-10-29 17:14:46 +01:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2018-10-29 17:14:46 +01:00

Sergey Sharybin commented

2018-10-29 17:14:46 +01:00

OpenSubdiv integration was reworked in 2.8. Is still missing GPU integration, but the root of this crash has been addressed.

Is still not enabled by default for public builds since we are still polishing some remaining things. But this report can be considered solved.

OpenSubdiv integration was reworked in 2.8. Is still missing GPU integration, but the root of this crash has been addressed. Is still not enabled by default for public builds since we are still polishing some remaining things. But this report can be considered solved.

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Blender crash when enabling OpenSubdiv #52059