[8u] RFR + RFA (S) 8212178: Soft reference reclamation race in com.sun.xml.internal.stream.util.ThreadLocalBufferAllocator

[Roman Kennke]

Hi Aleksey,

This change looks good to me. I am not a reviewer in and -updates
project though.

Roman

> Please review and approve the 8u backport for SoftReference race fix.
> 
>   Original Bug:
>       URL: https://bugs.openjdk.java.net/browse/JDK-8212178
>       Reporter: Roman Kennke
>       Assignee: Aleksey Shipilev
>       Priority: P4
>       Components: xml
> 
>   Original Fix:
>         12: JDK-8212178, http://hg.openjdk.java.net/jdk/jdk/rev/c83ba72377fc, 114 day(s) ago
> 
>   Backports and Forwardports:
>         11: 11.0.2, JDK-8212685, http://hg.openjdk.java.net/jdk-updates/jdk11u/rev/5978954e1d74, 110
> day(s) ago
>          8: MISSING
> 
> The patch does not apply cleanly to 8u even after reshuffling, because 8u code does not have
> subsequent patch that migrated JAXP to use generics [*]. The bug in question can be fixed by
> copy-pasting the entire code block from 11u to 8u. Here is the webrev:
>    http://cr.openjdk.java.net/~shade/8212178/webrev.8u.01/
> 
> Testing: 8u build, xml benchmarks
> 
> Thanks,
> -Aleksey
> 
> [*] https://bugs.openjdk.java.net/browse/JDK-8181150
>