The patch titled
pi-futex: missing pi_waiters plist initialization
has been added to the -mm tree. Its filename is
pi-futex-missing-pi_waiters-plist-initialization.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: pi-futex: missing pi_waiters plist initialization
From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
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 <arjan@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/sched.c | 5 +++++
1 file changed, 5 insertions(+)
diff -puN kernel/sched.c~pi-futex-missing-pi_waiters-plist-initialization kernel/sched.c
--- a/kernel/sched.c~pi-futex-missing-pi_waiters-plist-initialization
+++ a/kernel/sched.c
@@ -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:
*/
_
Patches currently in -mm which might be from heiko.carstens@xxxxxxxxxx are
origin.patch
git-klibc.patch
ia64-kprobe-invalidate-icache-of-jump-buffer-s390-fix.patch
pi-futex-missing-pi_waiters-plist-initialization.patch
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