[OpenJDK 2D-Dev] Defect 7032904(XRender: Java2Demo) remains (original) (raw)

Andrew Hughes gnu.andrew at redhat.com
Tue May 21 16:33:41 UTC 2013

----- Original Message -----

Hi Frank,

> Recently our team discovered defect 7032904(XRender: Java2Demo : Infinite > loop in Javasunjava2dloopsMaskBlitMaskBlit on OEL 5.6 x64) still > exists > in latest JDK (7u21) on SLES10SP4. It can be easily reproduced by running > SwingSet2 with Nimbus LAF. The issue is also seen in Java 8. Can anybody > look into it? Thanks for reporting the issue, I'll have a look at it. Most likely the code which is detecting the libXrender package-info version doesn't find the package-info files at the expected place and conservatively keeps the xrender pipeline enabled. The root problem still remains, we can not reliably detect the version of libXrender library used without targeting and testing every possibly affected distribution separately. As the versions of kernel and libXrender usually stay quite coherent for problematic distributions (old kernel == affected libXrender) and it is very easy to query the version of the linux-kernel currently running, I would propose to further restrict use of the xrender pipeline to systems running >= Linux-2.6.32, which is currently the oldest LTS kernel still supported. 2.6.32 was released in Dec. 2009. Hopefully this will not only avoid running into the libXrender-bug, but also avoid many driver-bugs caused by old and outdated drivers for the local use-case. In case of false positives it reverts back to the X11 backend instead, which in my opinion is the right thing to do in the event of uncertainty.

Do you know which versions of libXrender are supported?  We can check the version at configure time:

$ pkg-config --modversion renderproto 0.11.1

and disable the extension at compile-time. This is especially true with 6 where, IIRC, it's a patched-in option which is enabled by default, not part of upstream OpenJDK.

Basing it on kernel version seems very dodgy to me. I change my kernel version all the time and it's completely unrelated to the version of Xrender I'm running.

Regards, Clemens

PS: RHEL 5.5/5.6 runs linux-2.6.18 SLES-10 runs linux-2.6.16. Ubuntu 10.04 LTS (and higher) and Debian squeeze (6.0) both use Linux-2.6.32 and therefore would be supported.

-- Andrew :)

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

PGP Key: 248BDC07 (https://keys.indymedia.org/) Fingerprint = EC5A 1F5E C0AD 1D15 8F1F 8F91 3B96 A578 248B DC07

More information about the 2d-dev mailing list