Issue Summary

Build start failing with `ActiveStorage::IntegrityError` error while running Ruby on Rails in Pipelines.
This issue happens after pipelines upgrade Kubernetes FlatcarOS to v2765.2.2 on 4th May 2021
Infrastructure changes in Bitbucket Pipelines

Steps to Reproduce

The smallest test case demonstrating the problem appears to be this ruby script (copied from docker/for-mac#5570)

require 'fileutils'
require 'tempfile'
tempfile_1 = Tempfile.new(['tempfile_1', ".txt"])
FileUtils.cp('bitbucket-pipelines.yml', tempfile_1.path)
tempfile_2 = Tempfile.new(['tempfile_2', ".txt"])
FileUtils.cp(tempfile_1.path, tempfile_2.path)
puts tempfile_2.read # will be empty, but should not be

https://github.com/rails/rails/issues/41991#issuecomment-839430133

Expected Results

Rerunning the same succeded build before OS upgrade should show the same outcome

Actual Results

The build failed with following error:

ActiveStorage::IntegrityError

Workaround

Reach out to support team with the failed Build's URL as we have a temporary workaround for the issue while our infrastructure team working on a permanent solution.