* Vitaly Kuznetsov <vkuzn...@redhat.com> wrote:
> Vitaly Kuznetsov <vkuzn...@redhat.com> writes:
>
> > A hang on CPU0 onlining after a preceding offlining is observed. Trace
> > shows that CPU0 is stuck in check_tsc_sync_target() waiting for source
> > CPU to run check_tsc_sync_source() but this never happens. Source CPU,
> > in its turn, is stuck on synchronize_sched() which is called from
> > native_cpu_up() -> do_boot_cpu() -> unregister_nmi_handler().
> >
> > Fix the issue by moving unregister_nmi_handler() from do_boot_cpu() to
> > native_cpu_up() after cpu onlining is done.
Looks like a classic ABBA deadlock, due to the use of synchronize_sched() in
unregister_nmi_handler(), right?
> >
> > Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
> > ---
> > It's been awile since my v1 submission, no comments so far. Resending.
>
> Sorry, but
>
> ping?
>
> I haven't received a single comment on this since the initial submission
> on June, 26 - is it so bad? :-)
So the fix looks good to me at first sight, but wanted to wait for Thomas to
ack
it - once he gets back from vacation.
Thanks,
Ingo
