RFR: 8254695: G1: Next mark bitmap clear not cancelled after marking abort

[Thomas Schatzl]

On Thu, 15 Oct 2020 08:18:53 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews for this change that fixes aborting the concurrent next bitmap clear if aborted?
>> 
>> The problems are that we can enter the clear loop with the marking already aborted, so
>> - yielding does not return true any more (marking aborted while joining the STS)  and we never abort in the loop if we
>>   join all conditions together
>> - and G1 at least clears the first part(s) of the bitmap as the check is done afterwards
>> 
>> Testing: tier1-5; no more reproducable crashes with other changes (JDK-8253600)
>> 
>> Thanks,
>>   Thomas
>
> Looks good.

Thanks @kstefanj @walulyai for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/653