Compressed oops failure with hs19 master

[Dr Andrew John Hughes]

On 24 November 2010 22:09, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> Andrew,
>
> I looked on 647737 and reports were against HS19b06 but
> Oracle even not officially released jdk6u23 which has HS19.
> As one note in 647737 pointed, current build of HS19 is b09
> so I would suggest to try it (it is not clear if it was done).

It's been done.  The bug is still there.  I did report this on jdk6-dev:

http://mail.openjdk.java.net/pipermail/jdk6-dev/2010-November/002111.html

I guess it didn't make its way to the bug report too.

> And if it will not help, you may disable compressed oops
> in your build.

That's what we've done so far.  IcedTea6 1.9.2 went out today with
hs19 b09 and compressed oops disabled.  It should hit Fedora 14 soon.
See http://blog.fuseyism.com/index.php/2010/11/24/icedtea6-176-183-and-192-released/

Also it would be nice to have a small
> test which shows the problem.

We'd love one too, but haven't yet been able to reproduce it.  It
doesn't show up in testing or we wouldn't have shipped the binaries.

> We are testing COOP for long time already but most likely
> when 6u23 will be out we will find some issues which
> our testing did not catch.

This issue is in the pre-builds of 6u23, as far as I'm aware, so I
guess it's one of them.  It's also in current 7 builds.

>
> thanks,
> Vladimir
>
> Dr Andrew John Hughes wrote:
>>
>> I reported this on jdk6-dev
>>
>> (http://mail.openjdk.java.net/pipermail/jdk6-dev/2010-November/002095.html)
>> but thought it best to also report it here as there's been no
>> response.
>>
>> The hs19 stable branch crashes with Eclipse's CDT plugin:
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=647737
>>
>> and the same occurs with the current OpenJDK7 HotSpot tree.
>> (http://hg.openjdk.java.net/jdk7/hotspot/hotspot)
>>
>> Disabling compressed oops by default (as was done for hs17 stable)
>> will work around the problem, and this is what we presently do in
>> IcedTea6.
>>
>> Is compressed oops ready for prime time in hs19 or is turning it off
>> the right path to go down?  Has anyone else seen this issue or know of
>> anything that might fix it?
>>
>



-- 
Andrew :-)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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