On Tue, 18 Jun 2013, Prarit Bhargava wrote:
> Similar panics reported during bringup here:
>
> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-May/166205.html
> http://lkml.org/lkml/2013/5/8/342
>
> I've seen this a few times on 3.10 based kernels.
>
> [ 175.842027] Disabling non-boot CPUs ...
> [ 475.827017] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000048
That looks like a stale bit in tick_broadcast_force_mask.
Does the patch below fix it?
Thanks,
tglx
---
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 20d6fba..e01ca90 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -183,6 +183,8 @@ static void tick_do_broadcast(struct cpumask *mask)
int cpu = smp_processor_id();
struct tick_device *td;
+ cpumask_and(mask, mask, cpu_online_mask);
+
/*
* Check, if the current cpu is in the mask
*/
@@ -212,7 +214,6 @@ static void tick_do_periodic_broadcast(void)
{
raw_spin_lock(&tick_broadcast_lock);
- cpumask_and(tmpmask, cpu_online_mask, tick_broadcast_mask);
tick_do_broadcast(tmpmask);
raw_spin_unlock(&tick_broadcast_lock);
--
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