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[PATCH] pi-futex: missing pi_waiters plist initialization

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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]>
Acked-by: Ingo Molnar <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Heiko Carstens 2006-07-30 03:03:52 -07:00 • committed by Linus Torvalds
commit b50f60ceee
1 changed files with 5 additions and 0 deletions
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5
kernel/sched.c
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@ -6766,6 +6766,11 @@ void __init sched_init(void)
}
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:
*/