[aarch64-port-dev ] RFR: Fix racy update of code roots

[Zhengyu Gu]

Good to me.

-Zhengyu

On 12/14/20 1:04 PM, Roman Kennke wrote:
> I would like to cherry-pick this critical bug-fix into 
> aarch64-port/jdk8-shenandoah:
> 
> https://cr.openjdk.java.net/~rkennke/fixracycodecacheupdate/webrev.00/
> 
> It fixes a crash that has been observed by a number of users and 
> customers. See for example here for details:
> 
> https://mail.openjdk.java.net/pipermail/shenandoah-dev/2020-December/014044.html 
> 
> 
> The bugfix has been in shenandoah/jdk8 for almost a week now and testing 
> is clean.
> 
> https://mail.openjdk.java.net/pipermail/shenandoah-dev/2020-December/014082.html 
> 
> 
> It's been confirmed that it does fix the bug. Also, it is not a risky 
> fix, it is contained in Shenandoah and once found, it was fairly 
> obvious, and it is similar is spirit to what we already do in jdk11+ 
> (but slightly different in implementation).
> 
> Ok to push this to aarch64-port/jdk8u-shenandoah?
> 
> Thanks,
> Roman
>