gnb: fix crash in affinity_manager when default settings are used

Author: sauka

apps/gnb/gnb_worker_manager.h

@@ -29,7 +29,7 @@ class affinity_mask_manager
 public:
   /// Creates the tuned affinity mask manager with the given number of threads per core, reserves given amount of CPU
   /// cores for non priority tasks.
-  explicit affinity_mask_manager(unsigned nof_threads_per_core_ = 2U, unsigned nof_cores_for_non_prio_threads_ = 4U) :
+  explicit affinity_mask_manager(unsigned nof_threads_per_core_, unsigned nof_cores_for_non_prio_threads_) :
     nof_threads_per_core(nof_threads_per_core_),
     nof_cores_for_non_prio_threads(nof_cores_for_non_prio_threads_),
     cpu_bitset(compute_host_nof_hardware_threads())
@@ -44,6 +44,15 @@ class affinity_mask_manager
     cpu_bitset.fill(0, nof_cores_for_non_prio_threads, true);
   }
 
+  /// Default constructor.
+  affinity_mask_manager() :
+    nof_threads_per_core(2U),
+    nof_cores_for_non_prio_threads(compute_host_nof_hardware_threads() / 2),
+    cpu_bitset(compute_host_nof_hardware_threads())
+  {
+    cpu_bitset.fill(0, nof_cores_for_non_prio_threads, true);
+  }
+
   /// \brief Returns an affinity mask with assigned CPU indexes.
   ///
   /// \param name Name of the task trying to reserve a CPU core.