NoMethodError when parallel push of policyfile

Description

Trying to do parallel push of a single policyfile to multiple policy groups. This is being executed from a jenkins pipeline. I am guessing it is something to do with the lock file being accessed by more than once process at the same time.

ChefDK Version

I have tried this with 2.4.17 and 1.6.11

Platform Version

Windows Server 2012 R2

Replication Case

Create a batch file .bat or similar solution in order to create parallel exceution of the command chef push. I have been able to replicate this by having a bat file with start chef push ... with a total of 10 executions.

Stacktrace

Error: Invalid lockfile data
Reason: (NoMethodError) undefined method `[]' for nil:NilClass


C:/opscode/chefdk/embedded/lib/ruby/gems/2.4.0/gems/chef-dk-2.4.17/lib/chef-dk/policyfile_lock.rb:402:in `set_name_from_lock_data'
C:/opscode/chefdk/embedded/lib/ruby/gems/2.4.0/gems/chef-dk-2.4.17/lib/chef-dk/policyfile_lock.rb:270:in `build_from_lock_data'
C:/opscode/chefdk/embedded/lib/ruby/gems/2.4.0/gems/chef-dk-2.4.17/lib/chef-dk/policyfile_services/push.rb:102:in `validate_lockfile'
C:/opscode/chefdk/embedded/lib/ruby/gems/2.4.0/gems/chef-dk-2.4.17/lib/chef-dk/policyfile_services/push.rb:77:in `run'
C:/opscode/chefdk/embedded/lib/ruby/gems/2.4.0/gems/chef-dk-2.4.17/lib/chef-dk/command/push.rb:74:in `run'
C:/opscode/chefdk/embedded/lib/ruby/gems/2.4.0/gems/chef-dk-2.4.17/lib/chef-dk/command/base.rb:58:in `run_with_default_options'
C:/opscode/chefdk/embedded/lib/ruby/gems/2.4.0/gems/chef-dk-2.4.17/lib/chef-dk/cli.rb:73:in `run'
C:/opscode/chefdk/embedded/lib/ruby/gems/2.4.0/gems/chef-dk-2.4.17/bin/chef:25:in `<top (required)>'
C:/opscode/chefdk/embedded/bin/chef:23:in `load'
C:/opscode/chefdk/embedded/bin/chef:23:in `<main>'

Start with lib/chef-dk/policyfile_lock.rb, especially set_name_from_lock_data and build_from_lock_data, then follow validation in lib/chef-dk/policyfile_services/push.rb. Reproduce the failure on Windows Server 2012 R2 by launching multiple chef push commands from a batch file, and confirm that parallel pushes no longer produce Invalid lockfile data or the NoMethodError.