Program: 89797
Project: 89797
Buggy source:
@Override public boolean expunge(UserVmVO vm,long callerUserId,Account caller){
  try {
    if (!_itMgr.advanceExpunge(vm,_accountMgr.getSystemUser(),caller)) {
      s_logger.info("String_Node_Str" + vm);
      return false;
    }
    _networkGroupMgr.removeInstanceFromGroups(vm.getId());
    removeInstanceFromInstanceGroup(vm.getId());
    long vmId=vm.getId();
    if (_rulesMgr.revokePortForwardingRule(vmId)) {
      s_logger.debug("String_Node_Str" + vmId + "String_Node_Str");
    }
 else {
      s_logger.warn("String_Node_Str" + vmId + "String_Node_Str");
    }
    if (_lbMgr.removeVmFromLoadBalancers(vmId)) {
      s_logger.debug("String_Node_Str" + vmId + "String_Node_Str");
    }
 else {
      s_logger.warn("String_Node_Str" + vmId + "String_Node_Str");
    }
    List<IPAddressVO> ips=_ipAddressDao.listByAssociatedVmId(vmId);
    if (ips != null) {
      for (      IPAddressVO ip : ips) {
        ip.setOneToOneNat(false);
        ip.setAssociatedWithVmId(null);
        _ipAddressDao.update(ip.getId(),ip);
        s_logger.debug("String_Node_Str" + ip + "String_Node_Str"+ vm+ "String_Node_Str");
      }
    }
    _itMgr.remove(vm,_accountMgr.getSystemUser(),caller);
    return true;
  }
 catch (  ResourceUnavailableException e) {
    s_logger.warn("String_Node_Str" + vm,e);
    return false;
  }
catch (  OperationTimedoutException e) {
    s_logger.warn("String_Node_Str" + vm,e);
    return false;
  }
catch (  ConcurrentOperationException e) {
    s_logger.warn("String_Node_Str" + vm,e);
    return false;
  }
}

Fixed version (ground truth):
@Override public boolean expunge(UserVmVO vm,long callerUserId,Account caller){
  UserContext ctx=UserContext.current();
  ctx.setAccountId(vm.getAccountId());
  try {
    if (!_itMgr.advanceExpunge(vm,_accountMgr.getSystemUser(),caller)) {
      s_logger.info("String_Node_Str" + vm);
      return false;
    }
    _networkGroupMgr.removeInstanceFromGroups(vm.getId());
    removeInstanceFromInstanceGroup(vm.getId());
    long vmId=vm.getId();
    if (_rulesMgr.revokePortForwardingRule(vmId)) {
      s_logger.debug("String_Node_Str" + vmId + "String_Node_Str");
    }
 else {
      s_logger.warn("String_Node_Str" + vmId + "String_Node_Str");
    }
    if (_lbMgr.removeVmFromLoadBalancers(vmId)) {
      s_logger.debug("String_Node_Str" + vmId + "String_Node_Str");
    }
 else {
      s_logger.warn("String_Node_Str" + vmId + "String_Node_Str");
    }
    List<IPAddressVO> ips=_ipAddressDao.listByAssociatedVmId(vmId);
    if (ips != null) {
      for (      IPAddressVO ip : ips) {
        ip.setOneToOneNat(false);
        ip.setAssociatedWithVmId(null);
        _ipAddressDao.update(ip.getId(),ip);
        s_logger.debug("String_Node_Str" + ip + "String_Node_Str"+ vm+ "String_Node_Str");
      }
    }
    _itMgr.remove(vm,_accountMgr.getSystemUser(),caller);
    return true;
  }
 catch (  ResourceUnavailableException e) {
    s_logger.warn("String_Node_Str" + vm,e);
    return false;
  }
catch (  OperationTimedoutException e) {
    s_logger.warn("String_Node_Str" + vm,e);
    return false;
  }
catch (  ConcurrentOperationException e) {
    s_logger.warn("String_Node_Str" + vm,e);
    return false;
  }
}