[crac] RFR: Report checkpoint processing to jcmd [v21]

[Ilarion Nakonechnyy]

On Mon, 15 Aug 2022 11:31:29 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

>> A straightforward implementation of this assertion leads to triggering it at restore. 
>> Seems like `LinuxAttachListener::write_fully()` doesnt reset the buffer_pos in `bufferedStream`, so the `bufferedStream->size() `is non-zero.  
>> 
>> Probably, it worth to add `bufferedStream->reset()` to `LinuxAttachOperation::write_operation_result()`
>
> I believe the data there is the text I observe with the CRAllowToSkipCheckpoint. So the root casue should be fixed (the text that won't be shown).

Looks like the issue with this assertion was fixed with the commit 29365804b4be9d0cf41a4feaf5ac46fe823d4fba

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PR: https://git.openjdk.org/crac/pull/10