merge

mysql-test/r/xa.result

@@ -55,3 +55,22 @@ select * from t1;
 a
 20
 drop table t1;
+drop table if exists t1;
+create table t1(a int, b int, c varchar(20), primary key(a)) engine = innodb;
+insert into t1 values(1, 1, 'a');
+insert into t1 values(2, 2, 'b');
+xa start 'a','b';
+update t1 set c = 'aa' where a = 1;
+xa start 'a','c';
+update t1 set c = 'bb' where a = 2;
+update t1 set c = 'bb' where a = 2;
+update t1 set c = 'aa' where a = 1;
+ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
+select count(*) from t1;
+count(*)
+2
+xa end 'a','c';
+ERROR XA102: XA_RBDEADLOCK: Transaction branch was rolled back: deadlock was detected
+xa rollback 'a','c';
+xa start 'a','c';
+End of 5.0 tests

mysql-test/t/xa.test

@@ -74,3 +74,47 @@ xa start 'zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz';
 select * from t1;
 drop table t1;
 
+disconnect con1;
+
+#
+# Bug#28323: Server crashed in xid cache operations
+#
+
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
+
+create table t1(a int, b int, c varchar(20), primary key(a)) engine = innodb;
+insert into t1 values(1, 1, 'a');
+insert into t1 values(2, 2, 'b');
+
+connect (con1,localhost,root,,);
+connect (con2,localhost,root,,);
+
+--connection con1
+xa start 'a','b';
+update t1 set c = 'aa' where a = 1;
+--connection con2
+xa start 'a','c';
+update t1 set c = 'bb' where a = 2;
+--connection con1
+--send update t1 set c = 'bb' where a = 2
+--connection con2
+--sleep 1
+--error ER_LOCK_DEADLOCK
+update t1 set c = 'aa' where a = 1;
+select count(*) from t1;
+--error ER_XA_RBDEADLOCK
+xa end 'a','c';
+xa rollback 'a','c';
+--disconnect con2
+
+connect (con3,localhost,root,,);
+--connection con3
+xa start 'a','c';
+
+--disconnect con1
+--disconnect con3
+--connection default
+
+--echo End of 5.0 tests

sql/handler.cc

@@ -817,7 +817,12 @@ int ha_rollback_trans(THD *thd, bool all)
     trans->nht=0;
     trans->no_2pc=0;
     if (is_real_trans)
-      thd->transaction.xid_state.xid.null();
+    {
+      if (thd->transaction_rollback_request)
+        thd->transaction.xid_state.rm_error= thd->net.last_errno;
+      else
+        thd->transaction.xid_state.xid.null();
+    }
     if (all)
     {
       thd->variables.tx_isolation=thd->session_tx_isolation;

sql/share/errmsg.txt

@@ -5645,3 +5645,7 @@ ER_LOAD_DATA_INVALID_COLUMN
   eng "Invalid column reference (%-.64s) in LOAD DATA"
 ER_LOG_PURGE_NO_FILE  
 	eng "Being purged log %s was not found"
+ER_XA_RBTIMEOUT XA106
+	eng "XA_RBTIMEOUT: Transaction branch was rolled back: took too long"
+ER_XA_RBDEADLOCK XA102
+	eng "XA_RBDEADLOCK: Transaction branch was rolled back: deadlock was detected"

sql/sql_class.h

@@ -927,7 +927,7 @@ struct st_savepoint {
   uint                 length, nht;
 };
 
-enum xa_states {XA_NOTR=0, XA_ACTIVE, XA_IDLE, XA_PREPARED};
+enum xa_states {XA_NOTR=0, XA_ACTIVE, XA_IDLE, XA_PREPARED, XA_ROLLBACK_ONLY};
 extern const char *xa_state_names[];
 
 typedef struct st_xid_state {
@@ -935,6 +935,8 @@ typedef struct st_xid_state {
   XID  xid;                           // transaction identifier
   enum xa_states xa_state;            // used by external XA only
   bool in_thd;
+  /* Error reported by the Resource Manager (RM) to the Transaction Manager. */
+  uint rm_error;
 } XID_STATE;
 
 extern pthread_mutex_t LOCK_xid_cache;

sql/sql_parse.cc

@@ -90,9 +90,57 @@ const char *command_name[]={
 };
 
 const char *xa_state_names[]={
-  "NON-EXISTING", "ACTIVE", "IDLE", "PREPARED"
+  "NON-EXISTING", "ACTIVE", "IDLE", "PREPARED", "ROLLBACK ONLY"
 };
 
+/**
+  Mark a XA transaction as rollback-only if the RM unilaterally
+  rolled back the transaction branch.
+
+  @note If a rollback was requested by the RM, this function sets
+        the appropriate rollback error code and transits the state
+        to XA_ROLLBACK_ONLY.
+
+  @return TRUE if transaction was rolled back or if the transaction
+          state is XA_ROLLBACK_ONLY. FALSE otherwise.
+*/
+static bool xa_trans_rolled_back(XID_STATE *xid_state)
+{
+  if (xid_state->rm_error)
+  {
+    switch (xid_state->rm_error) {
+    case ER_LOCK_WAIT_TIMEOUT:
+      my_error(ER_XA_RBTIMEOUT, MYF(0));
+      break;
+    case ER_LOCK_DEADLOCK:
+      my_error(ER_XA_RBDEADLOCK, MYF(0));
+      break;
+    default:
+      my_error(ER_XA_RBROLLBACK, MYF(0));
+    }
+    xid_state->xa_state= XA_ROLLBACK_ONLY;
+  }
+
+  return (xid_state->xa_state == XA_ROLLBACK_ONLY);
+}
+
+/**
+  Rollback work done on behalf of at ransaction branch.
+*/
+static bool xa_trans_rollback(THD *thd)
+{
+  bool status= test(ha_rollback(thd));
+
+  thd->options&= ~(ulong) OPTION_BEGIN;
+  thd->transaction.all.modified_non_trans_table= FALSE;
+  thd->server_status&= ~SERVER_STATUS_IN_TRANS;
+  xid_cache_delete(&thd->transaction.xid_state);
+  thd->transaction.xid_state.xa_state= XA_NOTR;
+  thd->transaction.xid_state.rm_error= 0;
+
+  return status;
+}
+
 #ifndef EMBEDDED_LIBRARY
 static bool do_command(THD *thd);
 #endif // EMBEDDED_LIBRARY
@@ -5070,6 +5118,7 @@ create_sp_error:
     }
     DBUG_ASSERT(thd->transaction.xid_state.xid.is_null());
     thd->transaction.xid_state.xa_state=XA_ACTIVE;
+    thd->transaction.xid_state.rm_error= 0;
     thd->transaction.xid_state.xid.set(thd->lex->xid);
     xid_cache_insert(&thd->transaction.xid_state);
     thd->transaction.all.modified_non_trans_table= FALSE;
@@ -5095,6 +5144,8 @@ create_sp_error:
       my_error(ER_XAER_NOTA, MYF(0));
       break;
     }
+    if (xa_trans_rolled_back(&thd->transaction.xid_state))
+      break;
     thd->transaction.xid_state.xa_state=XA_IDLE;
     send_ok(thd);
     break;
@@ -5126,6 +5177,12 @@ create_sp_error:
       XID_STATE *xs=xid_cache_search(thd->lex->xid);
       if (!xs || xs->in_thd)
         my_error(ER_XAER_NOTA, MYF(0));
+      else if (xa_trans_rolled_back(xs))
+      {
+        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
+        xid_cache_delete(xs);
+        break;
+      }
       else
       {
         ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
@@ -5134,6 +5191,11 @@ create_sp_error:
       }
       break;
     }
+    if (xa_trans_rolled_back(&thd->transaction.xid_state))
+    {
+      xa_trans_rollback(thd);
+      break;
+    }
     if (thd->transaction.xid_state.xa_state == XA_IDLE &&
         thd->lex->xa_opt == XA_ONE_PHASE)
     {
@@ -5180,28 +5242,26 @@ create_sp_error:
         my_error(ER_XAER_NOTA, MYF(0));
       else
       {
+        bool ok= !xa_trans_rolled_back(xs);
         ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
         xid_cache_delete(xs);
-        send_ok(thd);
+        if (ok)
+          send_ok(thd);
       }
       break;
     }
     if (thd->transaction.xid_state.xa_state != XA_IDLE &&
-        thd->transaction.xid_state.xa_state != XA_PREPARED)
+        thd->transaction.xid_state.xa_state != XA_PREPARED &&
+        thd->transaction.xid_state.xa_state != XA_ROLLBACK_ONLY)
     {
       my_error(ER_XAER_RMFAIL, MYF(0),
                xa_state_names[thd->transaction.xid_state.xa_state]);
       break;
     }
-    if (ha_rollback(thd))
+    if (xa_trans_rollback(thd))
       my_error(ER_XAER_RMERR, MYF(0));
     else
       send_ok(thd);
-    thd->options&= ~(ulong) OPTION_BEGIN;
-    thd->transaction.all.modified_non_trans_table= FALSE;
-    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
-    xid_cache_delete(&thd->transaction.xid_state);
-    thd->transaction.xid_state.xa_state=XA_NOTR;
     break;
   case SQLCOM_XA_RECOVER:
     res= mysql_xa_recover(thd);