Re: [Xen-devel] [PATCH v2] x86/cpu: Sync any remaining RCU callbacks after CPU up/down

[Jürgen Groß <jgross@xxxxxxxx>]

On 19.02.20 18:25, Igor Druzhinin wrote:
> During CPU down operation RCU callbacks are scheduled to finish
> off some actions later as soon as CPU is fully dead (the same applies
> to CPU up operation in case error path is taken). If in the same grace
> period another CPU up operation is performed on the same CPU, RCU callback
> will be called later on a CPU in a potentially wrong (already up again
> instead of still being down) state leading to eventual state inconsistency
> and/or crash.
>
> In order to avoid it - flush RCU callbacks explicitly upon finishing off
> the current operation.
>
> Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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