Issue Summary

When starting an agent using the installer with the start argument, a signal mask is added.

Steps to Reproduce

1. Run the Agent installer:

   java -Dbamboo.home=test-agent -jar atlassian-bamboo-agent-installer-6.7.2.jar https://<bamboo-url> start
   

2. Check the signals blocked by the mask

   ps -ef|grep bamboo
   grep SigBlk /proc/<PIDs>/status
   

Expected Results

SigBlk 0000000000000000

Actual Results

SigBlk 0000000000000004

Workaround

Install the agent and start with the bundled script:

# Install the agent
java -Dbamboo.home=test-agent -jar atlassian-bamboo-agent-installer-6.7.2.jar https://<bamboo-url> install

# Run the start script
test-agent/bin/bamboo-agent.sh start