Since the futex rework, __rt_mutex_start_proxy_lock() does no longer acquire the wait_lock so it must not drop it. Otherwise the lock is not only unlocked twice but also the preemption counter is underflown.
Cc: [email protected] Reported-by: Gusenleitner Klaus <[email protected]> Signed-off-by: Sebastian Andrzej Siewior <[email protected]> --- kernel/locking/rtmutex.c | 1 - 1 file changed, 1 deletion(-) diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index f03876322d4a..79f49d73e4d0 100644 --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -2281,7 +2281,6 @@ int __rt_mutex_start_proxy_lock(struct rt_mutex *lock, raw_spin_lock(&task->pi_lock); if (task->pi_blocked_on) { raw_spin_unlock(&task->pi_lock); - raw_spin_unlock_irq(&lock->wait_lock); return -EAGAIN; } task->pi_blocked_on = PI_REQUEUE_INPROGRESS; -- 2.14.1
