[7u80] RFR (backport): 8026303: CMS: JVM intermittently crashes with "FreeList of size 258 violates Conservation Principle" assert

[Stefan Johansson]

Hi,

Please review this backport to 7u-dev for:
https://bugs.openjdk.java.net/browse/JDK-8026303

Full webrev:
http://cr.openjdk.java.net/~sjohanss/8026303/webrev.00/

Webrev for changes to original fix:
http://cr.openjdk.java.net/~sjohanss/8026303/webrev.changeset/

Summary:
Backporting the fix for 8026303 will solve JDK-8055730, but the 
changeset doesn't apply clean to 7u-dev because of some refactoring and 
name changes. In 8 & 9 the method "dict_census_update" was misspelled 
(dict_census_udpate) and we didn't have an AdaptiveFreeList<FreeChunk> 
but instead used FreeList<FreeChunk>. Changing these name conflicts to 
the original changeset makes it apply clean and I have verified that the 
bug we want to fix goes away after applying it.

Some more information is available below in the original Request for 
approval mail I sent out.

Thank,
Stefan

On 2014-09-30 14:51, Stefan Johansson wrote:
> Hi,
>
> Please approve the backport of the fix for JDK-8026303 to jdk7u-dev. 
> This fix resolves the issue reported in JDK-8055730:
> https://bugs.openjdk.java.net/browse/JDK-8055730
>
> The changeset applies without any conflicts after the changeset has 
> been modified to match JDK-7 source. Two main changes was done to the 
> changeset, see this webrev for details:
> http://cr.openjdk.java.net/~sjohanss/8026303/webrev.changeset/
>
> Full webrev:
> http://cr.openjdk.java.net/~sjohanss/8026303/webrev.00/
>
> Original bug:
> https://bugs.openjdk.java.net/browse/JDK-8026303
> Original webrev:
> http://cr.openjdk.java.net/~jmasa/8026303/webrev.00/
> Original changeset:
> http://hg.openjdk.java.net/jdk9/hs-gc/hotspot/rev/0ade41b2dbeb
> Review:
> http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2013-November/008976.html 
>
>
> Thanks,
> Stefan
>
>
>