I used robertdebock/ansible-role-tomcat to install a Tomcat instance using Ansible. Works well until I deploy an application on it. Then java process hangs with 100% system CPU.
Starting with tomcat users without system work correctly.
I suspected :
- Linux limits
- VM slow I/O
But after a while I ran strace :
- by modifying systemd configuration
- by modifying catalina.sh configuration
All I have was a simple FUTEX wait...
And then I read the manual, as simple as :
strace -f -e trace=all -p <PID>
No need to trace from startup and by default, not all is traced...
After that, easy way, the process was reading recursively :
Just fixing the working_directory in the ansible role, and all is working.
Issue reported here.