[PATCH 07/11] lockdep/selftests: Unbalanced migrate_disable() & rcu_read_lock().

Sebastian Andrzej Siewior
2021-11-29T22:53:56Z

The tests with unbalanced lock() + unlock() operation leave a modified
preemption counter behind which is then reset to its original value
after the test.

The spin_lock() function on PREEMPT_RT does not include a
preempt_disable() statement but migrate_disable() and read_rcu_lock().
As a consequence both counter never get back to their original value and
the system explodes later after the selftest.
In the double-unlock case on PREEMPT_RT, the migrate_disable() and RCU
code will trigger a warning which should be avoided. These counter
should not be decremented below their initial value.

Save both counters and bring them back to their original value after the
test.
In the double-unlock case, increment both counter in advance to they
become balanced after the double unlock.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
lib/locking-selftest.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 4d614c74e6ec5..417056ba28e1f 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -712,12 +712,18 @@ GENERATE_TESTCASE(ABCDBCDA_rtmutex);

#undef E

+#ifdef CONFIG_PREEMPT_RT
+# define RT_PREPARE_DBL_UNLOCK() { migrate_disable(); rcu_read_lock(); }
+#else
+# define RT_PREPARE_DBL_UNLOCK()
+#endif
/*
* Double unlock:
*/
#define E() \
\
LOCK(A); \
+ RT_PREPARE_DBL_UNLOCK(); \
UNLOCK(A); \
UNLOCK(A); /* fail */

@@ -1398,7 +1404,13 @@ static int unexpected_testcase_failures;

static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
{
- unsigned long saved_preempt_count = preempt_count();
+ int saved_preempt_count = preempt_count();
+#ifdef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SMP
+ int saved_mgd_count = current->migration_disabled;
+#endif
+ int saved_rcu_count = current->rcu_read_lock_nesting;
+#endif

WARN_ON(irqs_disabled());

@@ -1432,6 +1444,18 @@ static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
* count, so restore it:
*/
preempt_count_set(saved_preempt_count);
+
+#ifdef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SMP
+ while (current->migration_disabled > saved_mgd_count)
+ migrate_enable();
+#endif
+
+ while (current->rcu_read_lock_nesting > saved_rcu_count)
+ rcu_read_unlock();
+ WARN_ON_ONCE(current->rcu_read_lock_nesting < saved_rcu_count);
+#endif
+
#ifdef CONFIG_TRACE_IRQFLAGS
if (softirq_count())
current->softirqs_enabled = 0;
--
2.34.0