RFR (XS) 8207006: serviceability/sa/TestUniverse.java#id0 crashes with EpsilonGC and AOT

[Aleksey Shipilev]

(Also missed "RFR" in subject, grr)

-Aleksey

On 07/11/2018 03:31 PM, Aleksey Shipilev wrote:
> (This is cross-cutting compiler and GC, so posting at hotspot-dev@)
> 
> Bug:
>   https://bugs.openjdk.java.net/browse/JDK-8207006
> 
> All uses of ci_card_table_address() outside of CardTableBarrierSet itself check
> is_a(BarrierSet::CardTableBarrierSet) before reaching for card table address. Epsilon does not have
> a card table, so unguarded check would assert in fastdebug, and crash in release.
> 
> Trivial fix:
>   http://cr.openjdk.java.net/~shade/8207006/webrev.01/
> 
> I would like to push this to jdk/jdk11 but I am puzzled to how do that. Do I need to seek another
> approval for jdk/jdk11? Do I push to both jdk/jdk and jdk/jdk11? Or just to jdk/jdk11, and it gets
> forward-ported automatically?
> 
> Testing: tier1_compiler (which seems to include AOT tests), HelloWorld AOT+Epsilon, jdk-submit (running)
> 
> Thanks,
> -Aleksey
>