ID 590887 - Random black artifacts appear when rendering certain Nuke scripts on Linux/macOS

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Problem summary
Random black artifacts appear when rendering certain Nuke scripts on Linux/macOS
 
Rendering the same Nuke script twice results in different artifacts in the renders
 
The Nuke script consists of Shuffle nodes, merges, a postage stamp, and in input image of certain colours
 
The issue does not happen when limiting rendering to a single thread
 
Customer reported version
nuke.14.1v2
 
Customer reported platform
rocky8
 
Steps to reproduce
 
1) Download and extract the attached blackArtifacts.zip

2) Open Nuke and open the Nuke script

3) Render the Write node, frame range 150-155, and read it back in, some of the pixels towards the bottom will randomly be black

 
*If you can't see the artifacts, then render two versions of the image sequence, and compare them using the provided Merge/Blur nodes.
 

 
Expected behaviour
For Nuke to render the image correctly
 
Actual behaviour
Random black artifacts appear across parts of the image
 
Workaround
Render the Nuke script using a single thread with -m 1
Remove any of the nodes in the Nuke script
 
Reproduced by support
This bug has been reproduced in:
Nuke 15.1v4 - Rocky 9.3, macOS Sonoma
Nuke 13.0v1 - Rocky 9.3, macOS Sonoma
 
Unable to reproduce bug in:
Nuke 15.1v4 - Windows 10
 
Earliest version tested
Nuke 13.0v1 - This issue appears to be in all tested versions of the product
 

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