blockjob: strengthen a bit test-blockjob-txn

Unlike test-blockjob-txn, QMP releases the reference to the transaction
before the jobs finish.  Thus, qemu-iotest 124 showed a failure while
working on the next patch that the unit tests did not have.  Make
the test a little nastier.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20170508141310.8674-10-pbonzini@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>

diff --git a/tests/test-blockjob-txn.c b/tests/test-blockjob-txn.c
index 0f80194e856a398af11ba63d20b77a5238608556..c77343fc04d943054c8356fe5dd171c0a33e3f53 100644 (file)
--- a/tests/test-blockjob-txn.c
+++ b/tests/test-blockjob-txn.c
@@ -167,6 +167,11 @@ static void test_pair_jobs(int expected1, int expected2)
     block_job_start(job1);
     block_job_start(job2);
 
+    /* Release our reference now to trigger as many nice
+     * use-after-free bugs as possible.
+     */
+    block_job_txn_unref(txn);
+
     if (expected1 == -ECANCELED) {
         block_job_cancel(job1);
     }
@@ -187,8 +192,6 @@ static void test_pair_jobs(int expected1, int expected2)
 
     g_assert_cmpint(result1, ==, expected1);
     g_assert_cmpint(result2, ==, expected2);
-
-    block_job_txn_unref(txn);
 }
 
 static void test_pair_jobs_success(void)