clockevents_shutdown vs pending interrupt

From: Andriy Gapon
Date: Tue Jun 23 2015 - 06:02:35 EST

Pardon if I am asking something obvious or silly...

tick_check_new_device() has the following code:

if (tick_is_broadcast_device(curdev)) {
curdev = NULL;


void clockevents_shutdown(struct clock_event_device *dev)
clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
dev->next_event.tv64 = KTIME_MAX;

This is all done while interrupts are disabled on the current CPU.
But what if there is already a pending interrupt from the current source?
Is it possible that the timer interrupt would be processed by the device that
was put in the shutdown mode?

Some context: I am experiencing exactly the same symptoms as described here But I run a kernel where
that bug is fixed. And my problem happens in a VM, so it's possible that there
are timing issues which are very unlikely on real hardware.

Andriy Gapon
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