NURBS curve with a single point crashes Blender #117709

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Ralph · 2024-02-01T07:39:37+01:00

Ralph commented

2024-02-01 07:39:37 +01:00

System Information
Operating system: macOS-13.4.1-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M2 Max 1.2

Blender Version
Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: 9be62e85b727
Worked: (newest version of Blender that worked as expected)

Short description of error

Blender crashes when trying to open Object Data Properties->Active Spline for a NURBS curve with a single control point.

Exact steps for others to reproduce the error

From a factory reset:

I wrote a Python script to create a primitive NURBS curve (with 4 points) then deleted points at index 1, 2, and 3 leaving only the first point at index 0.

OR...

You can add a Nurbs Curve manually through the UI and delete those same points in EDIT mode.

With the NURBS curve selected click on Object Data Properties.
Click on "Active Spline" to expand it.
BOOM! Blender crashes with this stderr in the terminal window: "WARN (bke.anim): source/blender/blenkernel/intern/anim_path.cc:70 BKE_anim_path_calc_data: No bev list data!
Trace/BPT trap: 5"

If you are already in Object Data Properties->Active Spline and then try to delete those same three control points it's BOOM again.

I suspect it's the "Order U" value which has a maximum value of 2 when there are two control points, a maximum value of 3 when there are 3 control points, and so on for 4 and 5 points. But Order U chokes when there is only one control point.

**System Information** Operating system: macOS-13.4.1-arm64-arm-64bit 64 Bits Graphics card: Metal API Apple M2 Max 1.2 **Blender Version** Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: `9be62e85b727` Worked: (newest version of Blender that worked as expected) **Short description of error** Blender crashes when trying to open Object Data Properties->Active Spline for a NURBS curve with a single control point. **Exact steps for others to reproduce the error** From a factory reset: 1) I wrote a Python script to create a primitive NURBS curve (with 4 points) then deleted points at index 1, 2, and 3 leaving only the first point at index 0. OR... You can add a Nurbs Curve manually through the UI and delete those same points in EDIT mode. 2) With the NURBS curve selected click on Object Data Properties. 3) Click on "Active Spline" to expand it. 4) BOOM! Blender crashes with this stderr in the terminal window: "WARN (bke.anim): source/blender/blenkernel/intern/anim_path.cc:70 BKE_anim_path_calc_data: No bev list data! Trace/BPT trap: 5" If you are already in Object Data Properties->Active Spline and then try to delete those same three control points it's BOOM again. I suspect it's the "Order U" value which has a maximum value of 2 when there are two control points, a maximum value of 3 when there are 3 control points, and so on for 4 and 5 points. But Order U chokes when there is only one control point.

Ralph added the

labels 2024-02-01 07:39:38 +01:00

Pratik Borhade commented

2024-02-01 11:45:13 +01:00

Hi, thanks for the report. Unable to confirm the crash. Though I can confirm the console error in anim_path.cc due to nullptr bl

Hi, thanks for the report. Unable to confirm the crash. Though I can confirm the console error in `anim_path.cc` due to nullptr `bl`

Pratik Borhade added

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labels 2024-02-01 11:45:25 +01:00

Philipp Oeser commented

2024-02-01 14:01:23 +01:00

Not getting a crash either

Note we are already warning:

@PratikPB2123 : I think the warning WARN (bke.anim) does not justify confirming this.

Maybe the crash is only happening on Mac? @mano-wii : could you check?

Not getting a crash either Note we are already warning: ![image](/attachments/a889e771-757e-4b7d-b92a-6486d8b16769) @PratikPB2123 : I think the warning `WARN (bke.anim)` does not justify confirming this. Maybe the crash is only happening on Mac? @mano-wii : could you check?

image.png

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Philipp Oeser added

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labels 2024-02-01 14:02:04 +01:00

Pratik Borhade commented

2024-02-02 04:13:25 +01:00

Indeed, I rushed here a bit. Thought bl/bevlist should not be null here? Need to investigate this more.
@Prefect , can you share logs: https://docs.blender.org/manual/en/dev/troubleshooting/crash.html#macos

Indeed, I rushed here a bit. Thought `bl/bevlist` should not be null here? Need to investigate this more. @Prefect , can you share logs: https://docs.blender.org/manual/en/dev/troubleshooting/crash.html#macos

Pratik Borhade added

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labels 2024-02-02 04:13:34 +01:00

Ralph commented

2024-02-02 07:07:41 +01:00

Hi Pratik. Just FYI, the url you sent refers to a crash file with a .crash extension. Apparently, for whatever reason, it is a .ips file located in the ~/Library/Logs/DiagnosticReports/ directory named "Blender-2024-02-02-003149.ips".

It is attached.

Thanks!

Hi Pratik. Just FYI, the url you sent refers to a crash file with a .crash extension. Apparently, for whatever reason, it is a .ips file located in the ~/Library/Logs/DiagnosticReports/ directory named "Blender-2024-02-02-003149.ips". It is attached. Thanks!

Blender-2024-02-02-003149.ips

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Ralph closed this issue

2024-02-02 07:07:45 +01:00

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Ralph reopened this issue

2024-02-02 07:08:21 +01:00

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Ralph commented

2024-02-02 07:10:25 +01:00

Sorry, I closed the issue inadvertently because the button says "Comment and Close". I thought it meant close the window I suppose. It really should say "Comment and Close Issue".

Pratik Borhade commented

2024-02-02 07:30:55 +01:00

Thanks. Crash occurred in main-thread inside function BKE_nurb_valid_message (possibly due to wrong/insufficient buffer length).
What is the display language set for OS and in blender?

Thanks. Crash occurred in main-thread inside function `BKE_nurb_valid_message` (possibly due to wrong/insufficient buffer length). What is the display language set for OS and in blender?

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labels 2024-02-02 08:01:10 +01:00

Ralph commented

2024-02-02 15:21:17 +01:00

Both English, although I did not realize Spanish was the 2nd one listed for Mac OS. See attached.

Screenshot 2024-02-02 at 9.18.36 AM.jpg

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Screenshot 2024-02-02 at 9.16.11 AM.jpg

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Pratik Borhade commented

2024-02-05 05:29:08 +01:00

Thanks. Will wait for Germano to verify the crash on mac

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labels 2024-02-05 05:30:17 +01:00

Alaska commented

2024-02-08 13:28:25 +01:00

I can confirm a crash on my Mac, but can't get it to do it in a debug build.

System Information
Operating system: macOS-14.2.1-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M1 Pro 1.2
Blender version: 4.1.0 Alpha, branch: main, commit date: 2024-02-06 22:40, hash: 057b80dc9ec9

I can confirm a crash on my Mac, but can't get it to do it in a debug build. **System Information** Operating system: macOS-14.2.1-arm64-arm-64bit 64 Bits Graphics card: Metal API Apple M1 Pro 1.2 Blender version: 4.1.0 Alpha, branch: main, commit date: 2024-02-06 22:40, hash: `057b80dc9ec9`

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labels 2024-02-08 13:28:36 +01:00

Iliya Katushenock added the

Module

Modeling

label 2024-02-08 13:31:54 +01:00

Laurynas Duburas referenced this issue

2024-04-02 19:11:27 +02:00

Curves: Bezier handle selection support #119712

Laurynas Duburas commented

2024-04-02 19:50:27 +02:00

On M1 Max brk #0x01 instruction is compiled in after RPT_("At least two points required") call.

When writing BKE_nurb_valid_message I could not put TIP_ on variable, but rather on string literals, cause some magic was going behind the TIP_. Now it is the RPT_, but anyway, I don't see anything wrong in source.

On M1 Max `brk #0x01` instruction is compiled in after `RPT_("At least two points required")` call. ![assembly.png](/attachments/801d40cc-52ef-4607-9280-8572e71408a0) When writing `BKE_nurb_valid_message` I could not put `TIP_` on variable, but rather on string literals, cause some magic was going behind the `TIP_`. Now it is the `RPT_`, but anyway, I don't see anything wrong in source.

assembly.png

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Hans Goudey added

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