Program: 94322
Project: 94322
Buggy source:
public void stop(BundleContext ctxt) throws Exception {
  if (this.discoveredServiceTrackerRegistration != null) {
    this.discoveredServiceTrackerRegistration.unregister();
    this.discoveredServiceTrackerRegistration=null;
  }
  if (this.proxyrsContainerFinderRegistration != null) {
    this.proxyrsContainerFinderRegistration.unregister();
    this.proxyrsContainerFinderRegistration=null;
  }
  if (this.eventHookRegistration != null) {
    this.eventHookRegistration.unregister();
    this.eventHookRegistration=null;
  }
  if (this.hostrsContainerFinderRegistration != null) {
    this.hostrsContainerFinderRegistration.unregister();
    this.hostrsContainerFinderRegistration=null;
  }
  if (containerManagerTracker != null) {
    containerManagerTracker.close();
    containerManagerTracker=null;
  }
  if (logServiceTracker != null) {
    logServiceTracker.close();
    logServiceTracker=null;
    logService=null;
  }
  if (adapterManagerTracker != null) {
    adapterManagerTracker.close();
    adapterManagerTracker=null;
  }
  if (distributionProvider != null) {
    distributionProvider.dispose();
    distributionProvider=null;
  }
  if (proxyrsContainerFinder != null) {
    proxyrsContainerFinder.close();
    proxyrsContainerFinder=null;
  }
  if (hostRegistrationListenerServiceTracker != null) {
    hostRegistrationListenerServiceTracker.close();
    hostRegistrationListenerServiceTracker=null;
  }
  if (proxyDistributionListenerServiceTracker != null) {
    proxyDistributionListenerServiceTracker.close();
    proxyDistributionListenerServiceTracker=null;
  }
  if (idFactoryTracker != null) {
    idFactoryTracker.close();
    idFactoryTracker=null;
  }
synchronized (this) {
    this.context=null;
  }
  plugin=null;
}

Fixed version (ground truth):
public void stop(BundleContext ctxt) throws Exception {
  if (this.discoveredServiceTrackerRegistration != null) {
    this.discoveredServiceTrackerRegistration.unregister();
    this.discoveredServiceTrackerRegistration=null;
  }
  if (discoveredServiceTrackerImpl != null) {
    this.discoveredServiceTrackerImpl.close();
    this.discoveredServiceTrackerImpl=null;
  }
  if (this.proxyrsContainerFinderRegistration != null) {
    this.proxyrsContainerFinderRegistration.unregister();
    this.proxyrsContainerFinderRegistration=null;
  }
  if (this.eventHookRegistration != null) {
    this.eventHookRegistration.unregister();
    this.eventHookRegistration=null;
  }
  if (this.hostrsContainerFinderRegistration != null) {
    this.hostrsContainerFinderRegistration.unregister();
    this.hostrsContainerFinderRegistration=null;
  }
  if (containerManagerTracker != null) {
    containerManagerTracker.close();
    containerManagerTracker=null;
  }
  if (logServiceTracker != null) {
    logServiceTracker.close();
    logServiceTracker=null;
    logService=null;
  }
  if (adapterManagerTracker != null) {
    adapterManagerTracker.close();
    adapterManagerTracker=null;
  }
  if (distributionProvider != null) {
    distributionProvider.dispose();
    distributionProvider=null;
  }
  if (proxyrsContainerFinder != null) {
    proxyrsContainerFinder.close();
    proxyrsContainerFinder=null;
  }
  if (hostRegistrationListenerServiceTracker != null) {
    hostRegistrationListenerServiceTracker.close();
    hostRegistrationListenerServiceTracker=null;
  }
  if (proxyDistributionListenerServiceTracker != null) {
    proxyDistributionListenerServiceTracker.close();
    proxyDistributionListenerServiceTracker=null;
  }
  if (idFactoryTracker != null) {
    idFactoryTracker.close();
    idFactoryTracker=null;
  }
synchronized (this) {
    this.context=null;
  }
  plugin=null;
}