Please see this comment in a Rubinius issue regarding Listen fallback-to-polling behavior. The stack trace points to code that appears to call #start on an instance of Thread, but .start is only defined on the Thread class.
There are more details in the issue, as well as some apparent difficulty getting Listen to pick up the env var to enable verbose debugging, however, I've been able to get it show debugging as expected.
Please see this comment in a Rubinius issue regarding Listen fallback-to-polling behavior. The stack trace points to code that appears to call
#starton an instance of Thread, but.startis only defined on the Thread class.There are more details in the issue, as well as some apparent difficulty getting Listen to pick up the env var to enable verbose debugging, however, I've been able to get it show debugging as expected.