Vitaly Kuznetsov <> 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.
> Signed-off-by: Vitaly Kuznetsov <>
> ---
> It's been awile since my v1 submission, no comments so far. Resending.

Sorry, but 


I haven't received a single comment on this since the initial submission
on June, 26 - is it so bad? :-)


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