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SubjectRe: clockevents_program_event WARN_ON preventing boot.
On Thu, May 02, 2013 at 12:37:26PM +0200, Thomas Gleixner wrote:

> > On a second machine, I'm seeing an oops even earlier. As soon as I
> > exit grub, I get a blinking cursor. If I boot with earlyprintk=vga
> > I can see..
> >
> > Call Trace:
> > <IRQ>
> > tick_check_oneshot_broadcast
> > tick_check_idle
> > irq_enter
> > do_IRQ
> > common_interrupt
> > <EOI>
> > x86_64_start_reservations
> > x86_64_start_kernel
> > RIP: clockevents_set_mode+0x18
> >
> > Matching up the Code: line of the trace with the disassembly I see..
> >
> > if (dev->mode != mode) {
> > 4c8: 39 77 38 cmp %esi,0x38(%rdi)
> >
> >
>
> diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
> index 61d00a8..db9da73 100644
> --- a/kernel/time/tick-broadcast.c
> +++ b/kernel/time/tick-broadcast.c
> @@ -475,7 +475,8 @@ void tick_check_oneshot_broadcast(int cpu)
> if (cpumask_test_cpu(cpu, tick_broadcast_oneshot_mask)) {
> struct tick_device *td = &per_cpu(tick_cpu_device, cpu);
>
> - clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_ONESHOT);
> + if (td)
> + clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_ONESHOT);
> }
> }
>

td must be non-null, because this doesn't change anything.

a clue: If I disable CONFIG_SLUB_DEBUG, or even boot with slub_debug=- then it boots fine.

I'll bisect.

Dave



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