RFR: 8229169: False failure of GenericTaskQueue::pop_local on architectures with weak memory model

[Jie Fu]

We (Loongson) are highly appreciated if this bug could be fixed.
Thanks Martin, Kim and Thomas for your help.

And special thanks to Kim for sponsoring it.

Thanks a lot.
Best regards,
Jie

On 2019/8/7 下午4:24, Doerr, Martin wrote:
> Hi Jie and Kim,
>
> I've run Jie's test for a while on a Power 8 machine, but the issue didn't show up.
>
>> Martin, I assume you also saw JDK-8229020, also from Jie?  I'm
>> somewhat surprised neither of these has been previously reported.
>> Maybe these Loongson CPUs are more aggressively re-ordering reads than
>> are other platforms?
> There are other effects which may prevent re-ordering like data on same cache line, branch predicted differently, ...
> So I'm not surprised we haven't observed all possible re-orderings.
>
> Thanks, Jie, for improving the comment in your latest webrev. Looks good to me.
> I appreciate that this gets fixed. Such problems are hard to find.
>
> Best regards,
> Martin
>