Hi: I'd like to adopt Twisted for a current project I'm coding up. I'm on CentOS 6.7 x86-64 using python v2.6 and the stock python-twisted-8.2.0-3.1 package built for this release. No matter what I do when trying to implement the Process protocol or use utils.getProcessOutput() directly, I always see the following warning message on the console: /usr/lib64/python2.6/site-packages/twisted/internet/utils.py:25: PotentialZombieWarning: spawnProcess called, but the SIGCHLD handler is not installed. This probably means you have not yet called reactor.run, or called reactor.run(installSignalHandler=0). You will probably never see this process finish, and it may become a zombie process. reactor.spawnProcess(p, executable, (executable,)+tuple(args), env, path) ... Is there anyway to get rid of this message? I realize I'm using an older release of twisted but I can't upgrade to the latest without incurring the cost of installing an python v2.7 or greater. My script is literally: d = utils.getProcessOutput('/bin/ls') d.addCallbacks(writeResponse, noResponse) reactor.run() etc. What am I doing wrong? -aps