ID 371664 - [MAC] A crash occurs when rendering or setting keyframes with a ZDefocus node enabled with an AMD FirePro GPU.

Problem summary:
[MAC] A crash occurs when rendering or setting keyframes with a ZDefocus node enabled with an AMD FirePro GPU.

Customer reported version:
nuke.11.2v3

Customer reported platform:
10.13

Steps to reproduce:
1) From Nuke, add a Ramp node to the Node Graph.
2) Add a ShuffleCopy node and a Checkerboard node, with the Ramp as input 1 and Checkerboard as input 2.
3) Include a ZDefocus node and attach it to the ShuffleCopy with the image input of the node. 

   

4) Double-click the ShuffleCopy node to open the Properties bin and set the following settings:

5) Double-click the ZDefocus node to open the Properties bin, and set keyframes for the following settings: focus plane and depth of field.

   

6) Continue setting keyframes at different intervals on the timeline for the focus plane, depth of field, and moving the sliders randomly in-between.
7) Observe the performance of Nuke while adjusting knobs of the ZDefocus node with an AMD FirePro GPU enabled.

Workaround:
1) Disable the 'Use GPU if available' knob on the ZDefocus node.

2) If the GPU processing is required, you can reduce the crashing by using the following flags:

a) Allocating the GPU, using the --gpu flag

b) Activating multi-threading, using the --multigpu flag

c) Reducing the machines thread count, using the -m flag

More information on command line flags can be found here:

https://learn.foundry.com/nuke/content/comp_environment/configuring_nuke/command_line_operations.html#UsingcommandlineFlags

Reproduced by Support in:

Nuke 11.2v4​ - macOS 10.12.6
Nuke 11.2v3 - macOS 10.12.6
Nuke 11.2v2 - macOS 10.12.6
Nuke 11.2v1 - macOS 10.12.6 - regression

Unable to reproduce bug in:
11.1v6 - macOS 10.12, Windows 10, CentOS 7

Earliest version tested:
Nuke 11.1v6 - This issue no longer appears in this version and has regressed.

Expected behavior:
Nuke should remain stable and continue rendering when a ZDefocus node is enabled with an AMD FirePro GPU.

Actual behavior:
Nuke crashes when rendering or adding keyframes on a ZDefocus node with an AMD FirePro GPU enabled.