1 files changed, 4 insertions, 1 deletions

diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 0deef71ff8d2..6522ae5b14a2 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -630,9 +630,12 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
         set_current_state(state);
 
         /* Setup the timer, when timeout != NULL */
-        if (unlikely(timeout))
+        if (unlikely(timeout)) {
                 hrtimer_start(&timeout->timer, timeout->timer.expires,
                               HRTIMER_MODE_ABS);
+                if (!hrtimer_active(&timeout->timer))
+                        timeout->task = NULL;
+        }
 
         for (;;) {
                 /* Try to acquire the lock: */