Client: make sure the Finisher's mutex lock not held during it being distructed

The objecter_finisher is already started in Client::Client(), but
in the failure path when initializing and starting the Client object,
we may not get a chance to call the Client::shutdown() to stop the
Finisher thread, which maybe still holding the mutex lock in it. Then
when destrucing the Finisher object the pthread_mutex_destroy() will
fail.

This fix will delay the objecter_finisher thread to start in ::init()
until we're ready to call Client::shutdown on any errors instead.

Fixes: https://tracker.ceph.com/issues/44389
Signed-off-by: Xiubo Li <xiubli@redhat.com>
(cherry picked from commit fbff4ee153f17da51c3b6675eb0616f2b2062f5e)

diff --git a/src/client/Client.cc b/src/client/Client.cc
index d3dceee2e521192cc999d12c0a07a3f336ea1c40..30bad16b343d055386c880ae6b4331413b891275 100644 (file)
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -303,9 +303,6 @@ Client::Client(Messenger *m, MonClient *mc, Objecter *objecter_)
                                  cct->_conf->client_oc_target_dirty,
                                  cct->_conf->client_oc_max_dirty_age,
                                  true));
-  objecter_finisher.start();
-  filer.reset(new Filer(objecter, &objecter_finisher));
-  objecter->enable_blacklist_events();
 }
 
 
@@ -473,10 +470,20 @@ void Client::dump_status(Formatter *f)
   }
 }
 
-int Client::init()
+void Client::_pre_init()
 {
   timer.init();
+
+  objecter_finisher.start();
+  filer.reset(new Filer(objecter, &objecter_finisher));
+  objecter->enable_blacklist_events();
+
   objectcacher->start();
+}
+
+int Client::init()
+{
+  _pre_init();
   {
     std::lock_guard l{client_lock};
     ceph_assert(!initialized);
@@ -14623,8 +14630,7 @@ StandaloneClient::~StandaloneClient()
 
 int StandaloneClient::init()
 {
-  timer.init();
-  objectcacher->start();
+  _pre_init();
   objecter->init();
 
   client_lock.lock();

diff --git a/src/client/Client.h b/src/client/Client.h
index 0ec989db2672b881b9f18c1e4d78804016a41441..7b6eef99d07b9daac2e0e8b072ee504ef539cbc7 100644 (file)
--- a/src/client/Client.h
+++ b/src/client/Client.h
@@ -953,6 +953,8 @@ protected:
 
   void _close_sessions();
 
+  void _pre_init();
+
   /**
    * The basic housekeeping parts of init (perf counters, admin socket)
    * that is independent of how objecters/monclient/messengers are