TypeError when running multiple 'winrm cmd' commands

[sysadmin1139]

I've run into an issue where running multiple winrm cmd commands will eventually trigger a TypeError in winrm-1.0.4/lib/winrm/http/transport.rb:141. Specifically, the third invocation will trigger it. The sample task:

    set :winrm_krb5_realm, 'OURS.LOCAL'
    namespace :windows_worker do

    desc 'Test task to expose fault'
    task :testbug, :roles => :windows_worker do

       command = []
       command << 'echo This is the first run'
       command << 'echo This is the second run'
       command << 'echo This is the third run'

       command.each do |cmd|
       winrm cmd do |channel, stream, data|
         puts "#{channel} - #{stream} - #{data}"
       end #winrm
    end #task

When executed against a single server, it'll error out on the third command. When run against two, it'll error out on the second line on the second server. The error:

winrm-1.0.4/lib/winrm/http/transport.rb:141:in `+': can't convert nil into String (TypeError)
from /winrm-1.0.4/lib/winrm/http/transport.rb:141:in `winrm_encrypt'
from /winrm-1.0.4/lib/winrm/http/transport.rb:80:in `send_request'
from /winrm-1.0.4/lib/winrm/winrm_service.rb:333:in `send_message'
from /winrm-1.0.4/lib/winrm/winrm_service.rb:180:in `cleanup_command'
from /winrm-1.0.4/lib/winrm/winrm_service.rb:224:in `run_cmd'
from /capistrano_winrm-1.0.0/lib/winrm_connection.rb:27:in `exec'
from /capistrano-2.8.0/lib/capistrano/command.rb:222:in `block (4 levels) in open_channels'
from /capistrano-2.8.0/lib/capistrano/command.rb:259:in `request_pty_if_necessary'
from /capistrano-2.8.0/lib/capistrano/command.rb:206:in `block (3 levels) in open_channels'
from /capistrano_winrm-1.0.0/lib/winrm_connection.rb:23:in `open_channel'
from /capistrano-2.8.0/lib/capistrano/command.rb:200:in `block (2 levels) in open_channels'
from /capistrano-2.8.0/lib/capistrano/command.rb:199:in `map'
from /capistrano-2.8.0/lib/capistrano/command.rb:199:in `block in open_channels'
from /capistrano-2.8.0/lib/capistrano/command.rb:197:in `map'
from /capistrano-2.8.0/lib/capistrano/command.rb:197:in `open_channels'
from /capistrano-2.8.0/lib/capistrano/command.rb:156:in `initialize'
from /capistrano-2.8.0/lib/capistrano/command.rb:134:in `new'
from /capistrano-2.8.0/lib/capistrano/command.rb:134:in `process'
from /capistrano-2.8.0/lib/capistrano/configuration/actions/invocation.rb:178:in `block in run_tree'
from /capistrano-2.8.0/lib/capistrano/configuration/connections.rb:198:in `block in execute_on_servers'
from /capistrano-2.8.0/lib/capistrano/configuration/connections.rb:186:in `each'
from /capistrano-2.8.0/lib/capistrano/configuration/connections.rb:186:in `each_slice'
from /capistrano-2.8.0/lib/capistrano/configuration/connections.rb:186:in `execute_on_servers'
from /capistrano-2.8.0/lib/capistrano/configuration/actions/invocation.rb:176:in `run_tree'
from /capistrano_winrm-1.0.0/lib/capistrano_winrm.rb:11:in `winrm_run'
from /capistrano-2.8.0/lib/capistrano/configuration/namespaces.rb:186:in `method_missing'
from /testtask.rb:199:in `block (3 levels) in load'
from /testtask.rb:198:in `each'
from /testtask.rb:198:in `block (2 levels) in load'
from /capistrano-2.8.0/lib/capistrano/configuration/execution.rb:139:in `instance_eval'
from /capistrano-2.8.0/lib/capistrano/configuration/execution.rb:139:in `invoke_task_directly'
from /capistrano-2.8.0/lib/capistrano/configuration/callbacks.rb:27:in `invoke_task_directly_with_callbacks'
from /capistrano-2.8.0/lib/capistrano/configuration/execution.rb:89:in `execute_task'
from /capistrano-2.8.0/lib/capistrano/configuration/execution.rb:101:in `find_and_execute_task'
from /capistrano-2.8.0/lib/capistrano/cli/execute.rb:46:in `block in execute_requested_actions'
from /capistrano-2.8.0/lib/capistrano/cli/execute.rb:45:in `each'
from /capistrano-2.8.0/lib/capistrano/cli/execute.rb:45:in `execute_requested_actions'
from /capistrano-2.8.0/lib/capistrano/cli/help.rb:19:in `execute_requested_actions_with_help'
from /capistrano-2.8.0/lib/capistrano/cli/execute.rb:34:in `execute!'
from /capistrano-2.8.0/lib/capistrano/cli/execute.rb:14:in `execute'
from /capistrano-2.8.0/bin/cap:4:in `<top (required)>'

It seems like something in capistrano_winrm is getting something confused, since I can create a file using the winrm gem directly and can do the same commands with no errors.

[pmorton]

+1 In debugging on Lion with Hiemdal fully initialized, iov0[:buffer].value is nil.