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BUG#43171 - Assertion failed: thd->transaction.xid_state.xid.is_null()

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XA START may cause assertion failure/server crash when it is called
after unilateral roll back issued by the Resource Manager (both
in regular transaction and after XA transaction).

The problem was that rm_error variable wasn't set/reset properly.

mysql-test/r/xa.result:
  A test case for BUG#43171.
mysql-test/t/xa.test:
  A test case for BUG#43171.
sql/handler.cc:
  Setting rm_error when we're out of XA transaction has no
  special meaning. But it blocks reset of thd->transaction.xid
  structure later.
sql/sql_parse.cc:
  Reset rm_error before we enter ha_rollback(), so
  thd->transaction.xid strucure is reinitialized.
This commit is contained in:
Sergey Vojtovich 2009-10-28 19:39:08 +04:00
commit 17ed708975
4 changed files with 97 additions and 2 deletions
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25
mysql-test/r/xa.result
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@ -89,3 +89,28 @@ xa start 'a';
xa end 'a';
xa prepare 'a';
xa commit 'a';
CREATE TABLE t1(a INT, KEY(a)) ENGINE=InnoDB;
INSERT INTO t1 VALUES(1),(2);
BEGIN;
UPDATE t1 SET a=3 WHERE a=1;
BEGIN;
UPDATE t1 SET a=4 WHERE a=2;
UPDATE t1 SET a=5 WHERE a=2;
UPDATE t1 SET a=5 WHERE a=1;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
ROLLBACK;
ROLLBACK;
BEGIN;
UPDATE t1 SET a=3 WHERE a=1;
XA START 'xid1';
UPDATE t1 SET a=4 WHERE a=2;
UPDATE t1 SET a=5 WHERE a=2;
UPDATE t1 SET a=5 WHERE a=1;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
XA END 'xid1';
ERROR XA102: XA_RBDEADLOCK: Transaction branch was rolled back: deadlock was detected
XA ROLLBACK 'xid1';
XA START 'xid1';
XA END 'xid1';
XA ROLLBACK 'xid1';
DROP TABLE t1;