Fix data race in proc_bsr and ul_harq classes.

srsue/hdr/stack/mac/ul_harq.h

@@ -120,8 +120,8 @@ private:
     uint32_t              pid;
     std::atomic<uint32_t> current_tx_nb       = {0};
     std::atomic<uint32_t> current_irv         = {0};
-    bool                  harq_feedback;
-    bool                  is_grant_configured;
+    std::atomic<bool>     harq_feedback       = {false};
+    std::atomic<bool>     is_grant_configured = {false};
     bool                  is_initiated;
 
     srslog::basic_logger&  logger;

srsue/src/stack/mac/proc_bsr.cc

@@ -72,6 +72,8 @@ void bsr_proc::set_trigger(bsr_trigger_type_t new_trigger)
 
 void bsr_proc::reset()
 {
+  std::lock_guard<std::mutex> lock(mutex);
+
   timer_periodic.stop();
   timer_retx.stop();