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On some slow environments, there is a time between SIGCHLD and process termination. It leads to some issues as described at
https://bugs.launchpad.net/fuel/+bug/1444989
Puppet should verify SIGCHLD and make sure process actually ended and not zombied
Looking at util/execution.rb
if execution_stub = Puppet::Util::ExecutionStub.current_value
return execution_stub.call(*exec_args)
elsif Puppet.features.posix?
child_pid = execute_posix(*exec_args)
exit_status = Process.waitpid2(child_pid).last.exitstatus
Puppet code doesn't have any traps for sigchild to have any extra verifications if process zombied or stuck
trap(:CHLD) do
begin
while pid = Process.wait(-1, Process::WNOHANG)
exit if pid == child_pid
end
rescue Errno::ECHILD
end
end
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