Merge "Attempt process kill even if cgroup is already removed" into main

}

void Service::KillProcessGroup(int signal) {

    // If we've already seen a successful result from killProcessGroup*(), then we have removed

    // the cgroup already and calling these functions a second time will simply result in an error.

    // This is true regardless of which signal was sent.

    // These functions handle their own logging, so no additional logging is needed.

    if (!process_cgroup_empty_) {

    // Always attempt the process kill if process is still running.

    // Cgroup clean up routines are idempotent. It's safe to call

    // killProcessGroup repeatedly. During shutdown, `init` will

    // call this function to send SIGTERM/SIGKILL to all processes.

    // These signals must be sent for a successful shutdown.

    if (!process_cgroup_empty_ || IsRunning()) {

        LOG(INFO) << "Sending signal " << signal << " to service '" << name_ << "' (pid " << pid_

                  << ") process group...";

        int r;