Crash with Blackbody node in Base Color and Emission Color input #82673

New Issue

Bernhard Engstler · 2020-11-12T23:28:55+01:00

Bernhard Engstler commented

2020-11-12 23:28:55 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.91.0 Beta, branch: master, commit date: 2020-11-11 21:24, hash: b99faa0f56
Worked: I haven't tried earlier versions yet

Short description of error
Connecting a blackbody node to the base color and emission color of a principled BSDF and sliding the emission strength to the left (0) and releasing the mouse button crashes blender (cycles viewport rendering).

Console error:
Error : EXCEPTION_ACCESS_VIOLATION
Address : 0x00007FF79839CB12
Module : blender.exe
Thread : 00000dec

crash.txt blender.crash.txt

Exact steps for others to reproduce the error
Open default scene, go to shading workspace, select cycles renderer in rendering options, activate rendered viewport shading.
Connect a Blackbody node to Base Color and Emission Color. Increase the emission strength by sliding it way to the right. Slide it back to left (0 emission) and release the mouse button.
I think it also happened once when doing the same with the roughness slider, same node setup.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71 **Blender Version** Broken: version: 2.91.0 Beta, branch: master, commit date: 2020-11-11 21:24, hash: `b99faa0f56` Worked: I haven't tried earlier versions yet **Short description of error** Connecting a blackbody node to the base color and emission color of a principled BSDF and sliding the emission strength to the left (0) and releasing the mouse button crashes blender (cycles viewport rendering). Console error: Error : EXCEPTION_ACCESS_VIOLATION Address : 0x00007FF79839CB12 Module : blender.exe Thread : 00000dec crash.txt [blender.crash.txt](https://archive.blender.org/developer/F9269400/blender.crash.txt) **Exact steps for others to reproduce the error** Open default scene, go to shading workspace, select cycles renderer in rendering options, activate rendered viewport shading. Connect a Blackbody node to Base Color and Emission Color. Increase the emission strength by sliding it way to the right. Slide it back to left (0 emission) and release the mouse button. I think it also happened once when doing the same with the roughness slider, same node setup. ![Blender2.91_BlackbodyBug.jpg](https://archive.blender.org/developer/F9269418/Blender2.91_BlackbodyBug.jpg)

Bernhard Engstler commented

2020-11-12 23:28:55 +01:00

Added subscriber: @B_Engstler

Richard Antalik commented

2020-11-13 06:03:24 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-11-13 06:03:24 +01:00

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

Richard Antalik commented

2020-11-13 06:03:24 +01:00

Can not reproduce this in 2.91, in 2.92 crash happened on second attempt when sliding emmision strength value.
I still set to high prio to be on safe side.

I got crash in:

Main:

 	[External Code]	
>	blender.exe!wm_window_process_events(const bContext * C) Line 1605	C

 	blender.exe!WM_main(bContext * C) Line 635	C
 	blender.exe!main(int argc, const unsigned char * * UNUSED_argv_c) Line 527	C
 	[External Code]

Thread (crashed):

 	ntdll.dll!00007ffdc676ecb2()	Unknown
 	ntdll.dll!00007ffdc6777a72()	Unknown
 	ntdll.dll!00007ffdc6777d5a()	Unknown
 	ntdll.dll!00007ffdc677d991()	Unknown
 	ntdll.dll!00007ffdc67160dc()	Unknown
 	ntdll.dll!00007ffdc6685d21()	Unknown
 	ucrtbase.dll!00007ffdc3f3e97b()	Unknown
>	[Inline Frame] blender.exe!std::_Deallocate(void * _Ptr, unsigned __int64 _Bytes) Line 221	C++

 	[Inline Frame] blender.exe!std::allocator<char>::deallocate(char * const _Count, const unsigned __int64) Line 803	C++
 	[Inline Frame] blender.exe!std::string::_Tidy_deallocate() Line 4305	C++
 	[Inline Frame] blender.exe!std::string::{dtor}() Line 2723	C++
 	blender.exe!ccl::Session::update_status_time(bool show_pause, bool show_done) Line 1093	C++
 	blender.exe!ccl::Session::release_tile(ccl::RenderTile & rtile, const bool need_denoise) Line 617	C++
 	[Inline Frame] blender.exe!std::_Func_class<void,ccl::RenderTile &>::operator()(ccl::RenderTile &) Line 951	C++
 	blender.exe!ccl::CPUDevice::thread_render(ccl::DeviceTask & task) Line 1298	C++
 	blender.exe!ccl::CPUDevice::thread_run(ccl::DeviceTask & task) Line 552	C++
 	[External Code]	
 	[Inline Frame] blender.exe!std::_Func_class<void>::operator()() Line 951	C++
 	blender.exe!tbb::internal::function_task<std::function<void __cdecl(void)>>::execute() Line 1049	C++
 	[External Code]

Can not reproduce this in 2.91, in 2.92 crash happened on second attempt when sliding emmision strength value. I still set to high prio to be on safe side. I got crash in: Main: ``` [External Code] > blender.exe!wm_window_process_events(const bContext * C) Line 1605 C blender.exe!WM_main(bContext * C) Line 635 C blender.exe!main(int argc, const unsigned char * * UNUSED_argv_c) Line 527 C [External Code] ``` Thread (crashed): ``` ntdll.dll!00007ffdc676ecb2() Unknown ntdll.dll!00007ffdc6777a72() Unknown ntdll.dll!00007ffdc6777d5a() Unknown ntdll.dll!00007ffdc677d991() Unknown ntdll.dll!00007ffdc67160dc() Unknown ntdll.dll!00007ffdc6685d21() Unknown ucrtbase.dll!00007ffdc3f3e97b() Unknown > [Inline Frame] blender.exe!std::_Deallocate(void * _Ptr, unsigned __int64 _Bytes) Line 221 C++ [Inline Frame] blender.exe!std::allocator<char>::deallocate(char * const _Count, const unsigned __int64) Line 803 C++ [Inline Frame] blender.exe!std::string::_Tidy_deallocate() Line 4305 C++ [Inline Frame] blender.exe!std::string::{dtor}() Line 2723 C++ blender.exe!ccl::Session::update_status_time(bool show_pause, bool show_done) Line 1093 C++ blender.exe!ccl::Session::release_tile(ccl::RenderTile & rtile, const bool need_denoise) Line 617 C++ [Inline Frame] blender.exe!std::_Func_class<void,ccl::RenderTile &>::operator()(ccl::RenderTile &) Line 951 C++ blender.exe!ccl::CPUDevice::thread_render(ccl::DeviceTask & task) Line 1298 C++ blender.exe!ccl::CPUDevice::thread_run(ccl::DeviceTask & task) Line 552 C++ [External Code] [Inline Frame] blender.exe!std::_Func_class<void>::operator()() Line 951 C++ blender.exe!tbb::internal::function_task<std::function<void __cdecl(void)>>::execute() Line 1049 C++ [External Code] ```

Richard Antalik commented

2020-11-13 06:07:18 +01:00

I wanted to create test file, but I can't reproduce anymore, so we may be missing some necessary steps here.

Kévin Dietrich commented

2020-11-13 11:51:07 +01:00

Added subscriber: @kevindietrich

Kévin Dietrich commented

2020-11-13 11:51:07 +01:00

I am consistently getting crashes here in master, all I have to do is plug the blackbody node into the Emission socket of the principled node, and setting the strength to 0. Apparently the graph is removing the Emission input as an optimization (in PrincipledBsdfNode::expand) event though it was not disconnected. There is also no need to plug the blackbody node to two sockets, just in the Emission one appears to be enough.

In debug builds, this assertion is triggered:

blender: intern/cycles/render/graph.cpp:151: void ccl::ShaderNode::remove_input(ccl::ShaderInput*): Assertion `input->link == NULL' failed.

I am consistently getting crashes here in master, all I have to do is plug the blackbody node into the Emission socket of the principled node, and setting the strength to 0. Apparently the graph is removing the Emission input as an optimization (in PrincipledBsdfNode::expand) event though it was not disconnected. There is also no need to plug the blackbody node to two sockets, just in the Emission one appears to be enough. In debug builds, this assertion is triggered: ``` blender: intern/cycles/render/graph.cpp:151: void ccl::ShaderNode::remove_input(ccl::ShaderInput*): Assertion `input->link == NULL' failed. ```

Bernhard Engstler commented

2020-11-13 20:41:58 +01:00

In #82673#1053766, @iss wrote:
I wanted to create test file, but I can't reproduce anymore, so we may be missing some necessary steps here.

I tried again today, and interestingly it did not happen as often and had to try several times (up to ~10x). Here ist the blend file (if still relevant).
EmissionBug.blend
Exact steps:

Enable rendered viewport shading (cycles should be already enabled as render engine)
Connect blackbody node to emission color socket of Principled BSDF - crashes sometimes (emission strength is set to 0 already in Principled)
Disconnect and reconnect the blackbody node until it crashes - or
Increase emission strength and decrease to 0 repeatedly until it crashes
It even happened once when I reduced roughness to 0

I observed that it crashes when it says something like "updating shaders" in the viewport.

> In #82673#1053766, @iss wrote: > I wanted to create test file, but I can't reproduce anymore, so we may be missing some necessary steps here. I tried again today, and interestingly it did not happen as often and had to try several times (up to ~10x). Here ist the blend file (if still relevant). [EmissionBug.blend](https://archive.blender.org/developer/F9277952/EmissionBug.blend) Exact steps: 1. Enable rendered viewport shading (cycles should be already enabled as render engine) 2. Connect blackbody node to emission color socket of Principled BSDF - crashes sometimes (emission strength is set to 0 already in Principled) 3. Disconnect and reconnect the blackbody node until it crashes - or 4. Increase emission strength and decrease to 0 repeatedly until it crashes 5. It even happened once when I reduced roughness to 0 I observed that it crashes when it says something like "updating shaders" in the viewport.

blender-admin commented

2020-11-16 19:28:58 +01:00

This issue was referenced by 457d537fe4

This issue was referenced by 457d537fe4f33cfb16e5672404aa9f87797d9d23

Brecht Van Lommel commented

2020-11-16 19:30:36 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Brecht Van Lommel closed this issue

2020-11-16 19:30:36 +01:00

Brecht Van Lommel self-assigned this 2020-11-16 19:30:36 +01:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Crash with Blackbody node in Base Color and Emission Color input #82673