OpenJDK 6 B25 Available - backported patches by the icedtea team

[Xerxes Rånby]

2012-05-11 22:17, Dalibor Topic skrev:
> On 5/11/12 12:41 PM, Andrew Hughes wrote:
>> I'll second that.  I wasn't even aware of this release until Deepak pointed
>> it out last week.  
> 
> Lana started the promotion process in April: http://mail.openjdk.java.net/pipermail/jdk6-dev/2012-April/002666.html
> 
>> Are we still working on OpenJDK6?  The last time I posted
>> a patch it was suggested that things were winding down, so I'm a little surprised
>> to see another release.  We have a whole stack of patches still needing upstreaming
>> if they are wanted.
> 
> I think that releases for OpenJDK 6 make sense for the CPUs until November. Xerxes 
> mentioned some backports here: 
> http://mail.openjdk.java.net/pipermail/jdk6-dev/2012-April/date.html - are those the 
> fixes you mean?

No those two new patches are still not merged into IcedTea and under bug triage,
I brought them up for discussion to hopefully solve the two most frequent crashing bugs reported in to the IcedTea team.

The following two icedtea bugs indicate something odd in OpenJDK 6 synchronizer.cpp that look similar to the
http://mail.openjdk.java.net/pipermail/jdk6-dev/2012-April/002669.html - JVM crashes when heavyweight monitors are used
> #  Internal Error (synchronizer.cpp:1401), pid=1232, tid=1455453296
> #  guarantee(mid->header()->is_neutral()) failed: invariant
http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=887 - The bug for minecraft server on linux
http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=904 - unhandled signal 11 : os_linux_zero.cpp:236

And the following bugs indicate something odd in OpenJDK 6 that looks similar to
http://mail.openjdk.java.net/pipermail/jdk6-dev/2012-April/002670.html - arraycopy stubs place prebarriers incorrectly
http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=874

I think Andrew Huges was refering to the following large set of backports currently in use in IcedTea 6 builds:
These 100+ patches are all backports from the OpenJDK 7/8 hg trees to OpenJDK 6.
http://icedtea.classpath.org/hg/icedtea6/file/6ae19889a9e0/patches/openjdk
It would be really nice if all of these patches would be applied to OpenJDK 6 directly.

The IcedTea project also host a large set of new patches for OpenJDK 6 that are in various state of upstreaming progress:
http://icedtea.classpath.org/wiki/IcedTea_JDK6_Patches
When we manage to upstream one of these new patches then we quickly add a new backport to the IcedTea6 patch folders,
patches/openjdk , based on the upstream reviewed OpenJDK 7 and 8 commit.

Cheers
Xerxes