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

[Stefan Johansson]

On Wed, 14 Oct 2020 12:23:23 GMT, Thomas Schatzl <tschatzl 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.

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Marked as reviewed by sjohanss (Reviewer).

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