Bug: job attachments hashing gets stuck during GUI submit on MacOS in certain cases

[joel-wong-aws]

Describe the bug

We have received reports that the hashing step for job attachments (the step before upload) on Mac gets stuck, both at 0% and in the middle of the hashing.

Expected Behaviour

The hashing step should not get stuck.

Current Behaviour

After clicking submit in the GUI submitter (deadline bundle gui-submit), and confirming the number of files and output paths, a window appears reporting the hashing progress and upload progress. The hashing step sometimes get stuck at zero and sometimes gets stuck in the middle of hashing.

Reproduction Steps

There are two workarounds for this issue:

1. Instead of deadline bundle gui-submit, use deadline bundle submit
2. Limit the number of hashing threads. See this PR. The PR has been reverted for additional testing, but has been reported to solve the problem for some users.

Environment

At minimum:

1. Operating system: MacOS
2. Output of python3 --version: 3.11
3. Output of deadline --version: tested on 0.49.4
4. If this is from a version installed by the Deadline Cloud Submitter installer, then what version of the submitter installer? N/A, there is no submitter installer for Mac

[AlexTranAmz]

Thanks for reporting the issue. Will look into it.