Cycles crash with branched path tracing
Closed, ArchivedPublic


System Information
Windows 10
Nvidia GeForce GTX 960M

Blender Version

Short description of error
Pressing CTRL + Z to go into viewport render with GPU Rendering and Branched Path Tracing enabled causes a CUDA crash. Doing the same thing with 'Sampling' set to 'Path Tracing' instead of 'Branched Path Tracing and the rendering takes off without a problem.

Output from System Console:
CUDA error: Launch failed in cuCtxSynchronize()

Exact steps for others to reproduce the error
Blender file being executed is the free version of the Cycles Skin Shader by Matthew Heimlich



Seems alright here, are you by any chance also getting a message from windows about the graphics driver being restarted?

Display driver nvlddmkm stopped responding and has successfully recovered.

		[Name]		Display

-EventID 4101

		[Qualifiers]	        0

Level 3
Task 0
Keywords 0x80000000000000

		[SystemITime]	2017-02-16T22:02:40.723337300Z

EventRecordID 45456
Channel System

Sergey Sharybin (sergey) raised the priority of this task from Incomplete to Needs Triage.Feb 23 2017, 1:43 PM

Woops, my bad. Mixed with other reports :S

LazyDodo (LazyDodo) closed this task as Archived.Feb 23 2017, 2:47 PM
LazyDodo (LazyDodo) claimed this task.

You're hitting a display time out due to the render kernels running too long, if you pick a lower tile size the problem should go away.

The problem is with the viewport rendered view, final render seems to work fine.

You may have paused the viewport rendering. If that is the case, you will see something like this in the top

While in view port render mode, Check if the 'pause' button in the viewport menu/header is pressed. The pause button will be in the right bottom of the window.