From: Heiko Carstens <[email protected]>
Initialize init task's pi_waiters plist. Otherwise cpu hotplug of cpu 0
might crash, since rt_mutex_getprio() accesses an uninitialized list head.
call chain which led to crash:
take_cpu_down
sched_idle_next
__setscheduler
rt_mutex_getprio
Using PLIST_HEAD_INIT in the INIT_TASK macro doesn't work unfortunately, since
the pi_waiters member is only conditionally present.
Cc: Arjan van de Ven <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
---
kernel/sched.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/sched.c b/kernel/sched.c
index b44b9a4..db1014d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6761,6 +6761,11 @@ #endif
}
set_load_weight(&init_task);
+
+#ifdef CONFIG_RT_MUTEXES
+ plist_head_init(&init_task.pi_waiters, &init_task.pi_lock);
+#endif
+
/*
* The boot idle thread does lazy MMU switching as well:
*/
-
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