EXCEPTION_ACCESS_VIOLATION on file opening #87151

New Issue

Benjamin · 2021-04-02T23:52:16+02:00

Benjamin commented

2021-04-02 23:52:16 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1660 Ti with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab
Worked: version: 2.93.0 Alpha, branch: master, commit date: 2021-04-01 15:32, hash: 76cdcc2bca

Short description of error
I tried to open up a file with heavy geometry nodes (from someone else) but it immediately crashes.

Exact steps for others to reproduce the error
Customizable Screws.blend This is the file

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1660 Ti with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89 **Blender Version** Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: `02948a2cab` Worked: version: 2.93.0 Alpha, branch: master, commit date: 2021-04-01 15:32, hash: `76cdcc2bca` **Short description of error** I tried to open up a file with heavy geometry nodes (from someone else) but it immediately crashes. **Exact steps for others to reproduce the error** [Customizable Screws.blend](https://archive.blender.org/developer/F9918316/Customizable_Screws.blend) This is the file

Benjamin commented

2021-04-02 23:52:16 +02:00

Added subscriber: @Phonix-64

Falk David commented

2021-04-08 12:19:40 +02:00

Added subscriber: @filedescriptor

Falk David commented

2021-04-08 12:19:40 +02:00

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

Falk David commented

2021-04-08 12:19:40 +02:00

I can confirm the crash in 2.92.0. Not sure if we can call this a bug. But imo this shouldn't crash even if the file was saved in a never (Alpha) version.

Andrew Pluzhnikov commented

2021-04-13 16:32:06 +02:00

Added subscriber: @Andrew_Pluzhnikov

Andrew Pluzhnikov commented

2021-04-13 16:32:06 +02:00

Reproduced.
Customizable Screws.crash.txt

Reproduced. [Customizable Screws.crash.txt](https://archive.blender.org/developer/F9931868/Customizable_Screws.crash.txt)

Andrew Pluzhnikov commented

2021-04-19 00:11:05 +02:00

Not sure if we can call this a bug.

Wikipedia claims that .blend files are forward and backward compatible (with some exceptions).
(I can't find "official" statement on the blender side.)

Here we have a case of clear backward incompatibility between 2.93 and 2.92 versions.
I thinkwe can call that a bug.

> Not sure if we can call this a bug. Wikipedia [claims ](https://en.wikipedia.org/wiki/Blender_(software)#File_format) that .blend files are forward and backward compatible (with some exceptions). (I can't find "official" statement on the blender side.) Here we have a case of clear backward incompatibility between 2.93 and 2.92 versions. I *think*we can call that a bug.

Jacques Lucke commented

2021-05-17 17:57:49 +02:00

Added subscribers: @dfelinto, @JacquesLucke

Jacques Lucke commented

2021-05-17 17:57:49 +02:00

I found two reasons for why this not working:

We introduced new socket types that the old version can't handle (in this case 9f68f5c1e is the problem, but it could be any other new socket as well).
The join geometry node supports multiple inputs now, and the geometry nodes evaluator in 2.92 does not support that.

Generally, the issue is that too often I did not think about the case when future files are opened in an older version. Often new features cannot be handled correctly in old versions of course, but we could do better than we do now.

I could come up with a fix for this that would need to be applied to 2.92, but I'm unsure if it is worth it (and if this is a somewhat common practice). @dfelinto, how likely is it that we do another release of 2.92 because of that? Doesn't seem likely to me. Increasing BLENDER_FILE_MIN_VERSION could be the solution as you suggested.

I found two reasons for why this not working: * We introduced new socket types that the old version can't handle (in this case 9f68f5c1e is the problem, but it could be any other new socket as well). * The join geometry node supports multiple inputs now, and the geometry nodes evaluator in 2.92 does not support that. Generally, the issue is that too often I did not think about the case when future files are opened in an older version. Often new features cannot be handled correctly in old versions of course, but we could do better than we do now. I could come up with a fix for this that would need to be applied to 2.92, but I'm unsure if it is worth it (and if this is a somewhat common practice). @dfelinto, how likely is it that we do another release of 2.92 because of that? Doesn't seem likely to me. Increasing `BLENDER_FILE_MIN_VERSION` could be the solution as you suggested.

Bastien Montagne commented

2021-09-28 17:45:17 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2021-09-28 17:45:17 +02:00

Changed status from 'Confirmed' to: 'Archived'

Bastien Montagne closed this issue

2021-09-28 17:45:17 +02:00

Bastien Montagne commented

2021-09-28 17:45:17 +02:00

Think it's time to archive that, we could only consider back-fixes in LTS cases anyway imho.

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EXCEPTION_ACCESS_VIOLATION on file opening #87151