[#3112] catch all exception when running IOService run, run_one and poll

src/lib/asiolink/io_service_thread_pool.cc

@@ -164,7 +164,12 @@ IoServiceThreadPool::setState(State state) {
     case State::PAUSED: {
         // Stop IOService.
         if (!io_service_->stopped()) {
+            try {
                 io_service_->poll();
+            } catch (...) {
+                // Catch all exceptions.
+                // Logging is not available.
+            }
             io_service_->stop();
         }
 
@@ -180,7 +185,12 @@ IoServiceThreadPool::setState(State state) {
     case State::STOPPED: {
         // Stop IOService.
         if (!io_service_->stopped()) {
+            try {
                 io_service_->poll();
+            } catch (...) {
+                // Catch all exceptions.
+                // Logging is not available.
+            }
             io_service_->stop();
         }
 
@@ -215,8 +225,13 @@ IoServiceThreadPool::threadWork() {
                 }
             }
 
+            try {
                 // Run the IOService.
                 io_service_->run();
+            } catch (...) {
+                // Catch all exceptions.
+                // Logging is not available.
+            }
 
             {
                 std::unique_lock<std::mutex> lck(mutex_);

src/lib/process/d_controller.cc

@@ -837,7 +837,13 @@ DControllerBase::~DControllerBase() {
     }
 
     io_signal_set_.reset();
+    try {
         getIOService()->poll();
+    } catch (...) {
+        // Don't want to throw exceptions from the destructor. The process
+        // is shutting down anyway.
+        ;
+    }
 }
 
 std::string