Created attachment 20399 [details]
Screenshot showing the corruption

What sets JProfiler apart from most other apps I use, is that it's a Swing-based Java GUI-application. Maybe they do font rendering slightly differently, which triggers the problems.

The Java's X11 pipeline does font-rendering in software, so I guess its not something font-related at all.
However they are using ShmPut/Get a lot for such operations, maybe there is a race somewhere.

By the way I've written an RENDER based backend for Java: http://78.31.67.79:8080/jxrender/
This backend uses hw-accaleration almost everywhere, would be great if you could give it a try :)

Does the problem also persist if you start it with -Dsun.java2d.pmoffscreen=false ?

Have you tried disabling the usual suspects like AccelDFS or RenderAccel to see if that works around the problem?

(In reply to comment #4)
> Does the problem also persist if you start it with
> -Dsun.java2d.pmoffscreen=false ?
> 

This fixes the problem completely.

(In reply to comment #5)
> Have you tried disabling the usual suspects like AccelDFS or RenderAccel to see
> if that works around the problem?
> 

Will do  ..

(In reply to comment #7)
> (In reply to comment #5)
> > Have you tried disabling the usual suspects like AccelDFS or RenderAccel to see
> > if that works around the problem?
> > 
> 
> Will do  ..
> 

Hi again,

Some more data points:

AccelDFS==false     => does not help, corruption the same.
RenderAccel==false  => does not help, corruption the same.
AccelDFS==false && RenderAccel==false => does not help, corruption the same. 

When using old XAA, there is no corruption.

Disabling use of offscreen-pixmaps in Java2D solves the problem (like I've stated in earlier comment). But this workaround most be done on a per-application basis.

Regards,
Øyvind

I've donated a fix last week which automatically disables pmoffscreen if SHMPixmaps are not available - it will be integrated into JDK6u12 (next update).
This should also improve performance when EXA drivers are used.

After all, there is still a problem somewhere in the driver, even if is hidden by the fix.

(In reply to comment #9)
> I've donated a fix last week which automatically disables pmoffscreen if
> SHMPixmaps are not available - it will be integrated into JDK6u12 (next
> update).
> This should also improve performance when EXA drivers are used.
> 
> After all, there is still a problem somewhere in the driver, even if is hidden
> by the fix.
> 

That sounds nice :) You are right, there must be a problem in the driver somewhere as well, since when using old XAA, there is no corruption at all.

(In reply to comment #9)
> I've donated a fix last week which automatically disables pmoffscreen if
> SHMPixmaps are not available - it will be integrated into JDK6u12 (next
> update).

Is it possible that pmoffscreen is actually doing something wrong when SHMPixmaps aren't available?

Is there a testcase simpler than JProfiler, or at least freely available?

> Is it possible that pmoffscreen is actually doing something wrong when
> SHMPixmaps aren't available?
I don't think so. However when SHMPixmaps aren't available the code agressivly does SHMGet/ShmPut.

> Is there a testcase simpler than JProfiler, or at least freely available?
In general it should happen with any Swing application, sadly I don't have an ATI card. 
Øyvind: Could you try Jedit to see wether the problem persists also there?

(In reply to comment #12)
> > Is it possible that pmoffscreen is actually doing something wrong when
> > SHMPixmaps aren't available?
> I don't think so. However when SHMPixmaps aren't available the code agressivly
> does SHMGet/ShmPut.
> 
> > Is there a testcase simpler than JProfiler, or at least freely available?
> In general it should happen with any Swing application, sadly I don't have an
> ATI card. 
> Øyvind: Could you try Jedit to see wether the problem persists also there?
> 

Tested two more Java Swing apps with radeon+EXA:
* JEdit is OK, no problems.
* OxygenXML is OK, no problems.

Might be JProfiler that's doing something unusual which triggers problems. I should also note, JProfiler is the only app that defaults to native look-and-feel, the others use the classic Swing theme it seems.

Btw. when starting up Opera, I get this message:
opera: X Shared memory extension is not available. ZPixmap not supported

So, shared memory pixmaps are disabled, just like recent nvidia drivers do by default ?

This problem does not seem to occur anymore with JProfiler5 + latest Java 6 update 11. :)

(In reply to comment #14)
> This problem does not seem to occur anymore with JProfiler5 + latest Java 6
> update 11. :)
> 

And incidentally, that might also be the reason why there is no corruption in OxygenXML or Jedit, either.

7.4.99+git20140806.fbf575cb-0ubuntu0sarvatt3less /u

ubuntu-gnome 14.10 with : 7.4.99+git20140806.fbf575cb-0ubuntu0sarvatt3

The corruption is still there, rendering matlab editor (java based) useless, unless -Dsun.java2d.pmoffscreen=false is used.

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