Smooth Modifer Crash - TDR #76117

New Issue

Philip Holzmann · 2020-04-26T09:44:07+02:00

Philip Holzmann commented

2020-04-26 09:44:07 +02:00

System Information
Operating system: Windows 10 64 bit
Graphics card: Nvidia GTX 750 Ti

Blender Version
Broken: blender-2.83 beta 76b3aac802 or 47ae0affc8 master Fri Apr 24 11:34:04 2020 +0200

Short description of error
When the smooth modifier is applied with "crazy" values on some high poly meshes, it can crash randomly.

Checked the windows logs, and I guess a gpu timeout is what it is.

A TDR has been detected.
The application must close.

Error code: 7
 (pid=2248 tid=6436 blender.exe 64bit)

Visit http://nvidia.custhelp.com/app/answers/detail/a_id/3633 for more information.

Exact steps for others to reproduce the error
smooth01.blend
Slide the factor slider back and forth.
Sometimes it crashes immediately, sometimes it takes a few times.

**System Information** Operating system: Windows 10 64 bit Graphics card: Nvidia GTX 750 Ti **Blender Version** Broken: blender-2.83 beta 76b3aac802f9 or 47ae0affc8f29df92c82f2a9580b58f84819df7d master Fri Apr 24 11:34:04 2020 +0200 **Short description of error** When the smooth modifier is applied with "crazy" values on some high poly meshes, it can crash randomly. Checked the windows logs, and I guess a gpu timeout is what it is. ``` A TDR has been detected. The application must close. Error code: 7 (pid=2248 tid=6436 blender.exe 64bit) Visit http://nvidia.custhelp.com/app/answers/detail/a_id/3633 for more information. ``` **Exact steps for others to reproduce the error** [smooth01.blend](https://archive.blender.org/developer/F8495768/smooth01.blend) Slide the factor slider back and forth. Sometimes it crashes immediately, sometimes it takes a few times.

Philip Holzmann commented

2020-04-26 09:44:07 +02:00

Added subscriber: @Foaly

Germano Cavalcante commented

2020-04-28 14:23:45 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-04-28 14:23:45 +02:00

I slided the factor back and forth several times but I couldn't reproduce the crash.
Could it be that you are running out of memory?
While we want to improve Blender to handle such cases memory gracefully, this is not currently considered a bug.

I slided the factor back and forth several times but I couldn't reproduce the crash. Could it be that you are running out of memory? While we want to improve Blender to handle such cases memory gracefully, this is not currently considered a bug.

Richard Antalik commented

2020-04-28 19:26:59 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-04-28 19:26:59 +02:00

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

Richard Antalik commented

2020-04-28 19:26:59 +02:00

I got not responding situation here, pausing in debugger refused to show me anything.

I guess we could consider this known issue at least if this is caused by some "GPU hangup while process is waiting" situation that is hard to sanitize.

Though I am not sure what exactly is happening in this case.

I got not responding situation here, pausing in debugger refused to show me anything. I guess we could consider this known issue at least if this is caused by some "GPU hangup while process is waiting" situation that is hard to sanitize. Though I am not sure what exactly is happening in this case.

Germano Cavalcante commented

2020-04-28 19:33:46 +02:00

In #76117#919457, @iss wrote:
I got not responding situation here, pausing in debugger refused to show me anything.
...

The object being smoothed is extremely high poly, it is to be expected that the CPU takes time to compute all operations.
That's why I tested it in Release build.

> In #76117#919457, @iss wrote: > I got not responding situation here, pausing in debugger refused to show me anything. > ... The object being smoothed is extremely high poly, it is to be expected that the CPU takes time to compute all operations. That's why I tested it in Release build.

Richard Antalik commented

2020-04-28 21:49:20 +02:00

I have tested in release with debug info which usually give profiler data with no problems, but this time it gave up. also if I paused execution it showed only [external code].

Philip Holzmann commented

2020-04-29 07:15:40 +02:00

@iss Did it actually crash for you when not using a debugger?

Also, it occured to me to check the windows logs, and I guess a gpu timeout is what it is.

A TDR has been detected.
The application must close.

Error code: 7
 (pid=2248 tid=6436 blender.exe 64bit)

Visit http://nvidia.custhelp.com/app/answers/detail/a_id/3633 for more information.

This is unfortunate.
I believe if the smooth factor becomes too big (i.e. far greater than 1.0), the triangles become so big that they cause so many fragments to be rendered that the gpu timeouts.
I guess this could be mitigated by making 1.0 (or 2.0) a soft maximum for the factor slider, to prevent accidentally entering a huge value (which has happened to me).

@iss Did it actually crash for you when not using a debugger? Also, it occured to me to check the windows logs, and I guess a gpu timeout is what it is. ``` A TDR has been detected. The application must close. Error code: 7 (pid=2248 tid=6436 blender.exe 64bit) Visit http://nvidia.custhelp.com/app/answers/detail/a_id/3633 for more information. ``` This is unfortunate. I believe if the smooth factor becomes too big (i.e. far greater than 1.0), the triangles become so big that they cause so many fragments to be rendered that the gpu timeouts. I guess this could be mitigated by making 1.0 (or 2.0) a soft maximum for the factor slider, to prevent accidentally entering a huge value (which has happened to me).

Richard Antalik commented

2020-04-29 19:18:26 +02:00

In #76117#919767, @Foaly wrote:
@iss Did it actually crash for you when not using a debugger?

Technically not crash. but Blender become unresponsive.

Also, it occured to me to check the windows logs, and I guess a gpu timeout is what it is.
A TDR has been detected.
The application must close.

Error code: 7
 (pid=2248 tid=6436 blender.exe 64bit)

Visit http://nvidia.custhelp.com/app/answers/detail/a_id/3633 for more information.

Thanks for info.

I guess this could be mitigated by making 1.0 (or 2.0) a soft maximum for the factor slider, to prevent accidentally entering a huge value (which has happened to me).

Perhaps. I think, It is not ideal to change limits blindly if you can not guarantee that they will work.

> In #76117#919767, @Foaly wrote: > @iss Did it actually crash for you when not using a debugger? Technically not crash. but Blender become unresponsive. > Also, it occured to me to check the windows logs, and I guess a gpu timeout is what it is. > > > ``` > A TDR has been detected. > The application must close. > > Error code: 7 > (pid=2248 tid=6436 blender.exe 64bit) > > Visit http://nvidia.custhelp.com/app/answers/detail/a_id/3633 for more information. > ``` Thanks for info. > I guess this could be mitigated by making 1.0 (or 2.0) a soft maximum for the factor slider, to prevent accidentally entering a huge value (which has happened to me). Perhaps. I think, It is not ideal to change limits blindly if you can not guarantee that they will work.

Richard Antalik changed title from ~~Smooth Modifer Crashes Randomly~~ to Smooth Modifer Crash - TDR

2020-04-29 19:19:58 +02:00

Brecht Van Lommel commented

2020-05-01 18:25:13 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2020-05-01 18:25:13 +02:00

Changed status from 'Confirmed' to: 'Archived'

Brecht Van Lommel closed this issue

2020-05-01 18:25:13 +02:00

Brecht Van Lommel self-assigned this 2020-05-01 18:25:13 +02:00

Brecht Van Lommel commented

2020-05-01 18:25:13 +02:00

There is not a lot we can do about TDRs, they are hard to predict and once they happen it's fully up to the graphics driver to recover from them.

GPUs are just very slow at rendering many large overlapping triangles.

There is not a lot we can do about TDRs, they are hard to predict and once they happen it's fully up to the graphics driver to recover from them. GPUs are just very slow at rendering many large overlapping triangles.

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Smooth Modifer Crash - TDR #76117