RFR:[jdk11]:JDK-8213574: Deadlock in string table expansion when dumping lots of CDS classes

[Jiangli Zhou]

[+christoph.langer at sap.com, +martinrb at google.com]

Gentle ping

Martin or Christoph, could you please review the backport?

Thanks!
Jiangli



On Mon, May 18, 2020 at 2:31 PM Jiangli Zhou <jianglizhou at google.com> wrote:
>
> Please review the backport for JDK-8213574 to JDK 11:
>
> backport webrev:
> http://cr.openjdk.java.net/~jiangli/8213574-jdk11-backport/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8213574
>
> Original webrev: http://hg.openjdk.java.net/jdk/jdk/rev/d5eebe1e03fe
>
> CDS dumping may run into a deadlock situation during copying the
> interned j.l.String objects in the VM thread, while the service thread
> is concurrently expanding the string table. I ran into the deadlock
> recently when creating a CDS archive with an input classlist of ~60K
> classes on JDK 11. The backport addresses the deadlock issue.
>
> The diffs in symbolTable.cpp are not included in the backport as they
> only apply to ConcurrentHashTable. In JDK 11 the SymbolTable is not
> yet a ConcurrentHashTable. All other diffs in the patch applied
> cleanly.
>
> Tested with tier1, jtreg/runtime/SharedArchiveFile
>
> Best,
> Jiangli