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SubjectRe: clockevents_shutdown vs pending interrupt
Andriy,

On Wed, 1 Jul 2015, Andriy Gapon wrote:
> I've caught a couple of boot logs with different stack traces from unsuccessful
> boot attempts and one from a successful attempt with exactly the same VM
> configuration.
> The logs are here:
> https://people.freebsd.org/~avg/linux-boot-hang/

I have to admit, that I'm thoroughly confused about that broadcast
check in the install path. Can you apply the debug patch below and
provide the output?

Thanks,

tglx
---
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index d39f32cdd1b5..f1f921a49da9 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -100,6 +100,7 @@ void tick_install_broadcast_device(struct clock_event_device *dev)
if (cur)
cur->event_handler = clockevents_handle_noop;
tick_broadcast_device.evtdev = dev;
+ pr_err("Install broadcast device %p %s\n", dev, dev->name);
if (!cpumask_empty(tick_broadcast_mask))
tick_broadcast_start_periodic(dev);
/*
@@ -301,6 +302,13 @@ static void tick_handle_periodic_broadcast(struct clock_event_device *dev)
bool bc_local;

raw_spin_lock(&tick_broadcast_lock);
+ /* Handle spurious interrupt */
+ if (clockevent_state_shutdown(dev)) {
+ pr_err("Spurious broadcast event %p %s\n", dev, dev->name);
+ raw_spin_unlock(&tick_broadcast_lock);
+ return;
+ }
+
bc_local = tick_do_periodic_broadcast();

if (clockevent_state_oneshot(dev)) {
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 76446cb5dfe1..ecd439b2de7e 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -321,6 +321,7 @@ void tick_check_new_device(struct clock_event_device *newdev)
if (!try_module_get(newdev->owner))
return;

+ pr_err("Install per cpu tick device %p %s\n", newdev, newdev->name);
/*
* Replace the eventually existing device by the new
* device. If the current device is the broadcast device, do



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