Getting local graphics enviroment produces assert

[Johan Dahl]

Binary package hint: sun-java6-jre

If I use this in a java program

GraphicsEnvironment.getLocalGraphicsEnvironment()

will I get the following result

Locking assertion failure. Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0xb7d46767]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_unlock+0x31) [0xb7d468b1]
#2 /usr/lib/libX11.so.6(_XReply+0xfd) [0xb56fe1bd]
#3 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/xawt/libmawt.so [0xb57f98ce]
#4 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/xawt/libmawt.so [0xb57d6067]
#5 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/xawt/libmawt.so [0xb57d6318]
#6 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/xawt/libmawt.so(Java_sun_awt_X11GraphicsEnvironment_initDisplay+0x2f) [0xb57d661f]
#7 [0xb5cd5ecd]
#8 [0xb5cceedd]
#9 [0xb5cceedd]
#10 [0xb5ccc249]
#11 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/client/libjvm.so [0x621c40d]
#12 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/client/libjvm.so [0x6310378]
#13 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/client/libjvm.so [0x621c2a0]
#14 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/client/libjvm.so(JVM_DoPrivileged+0x363) [0x6272153]
#15 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/libjava.so(Java_java_security_AccessController_doPrivileged__Ljava_security_PrivilegedAction_2+0x3d) [0xb7ce796d]
#16 [0xb5cd5ecd]
#17 [0xb5cced77]
#18 [0xb5ccc249]
#19 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/client/libjvm.so [0x621c40d]
Locking assertion failure. Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0xb7d46767]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0xb7d4681e]
#2 /usr/lib/libX11.so.6 [0xb56fd518]
#3 /usr/lib/libX11.so.6(XGetVisualInfo+0x26) [0xb56f40a6]
#4 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/xawt/libmawt.so [0xb57d5319]
#5 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/xawt/libmawt.so [0xb57d5565]
#6 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/xawt/libmawt.so [0xb57d63c9]
#7 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/xawt/libmawt.so(Java_sun_awt_X11GraphicsEnvironment_initDisplay+0x2f) [0xb57d661f]
#8 [0xb5cd5ecd]
#9 [0xb5cceedd]
#10 [0xb5cceedd]
#11 [0xb5ccc249]
#12 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/client/libjvm.so [0x621c40d]
#13 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/client/libjvm.so [0x6310378]
#14 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/client/libjvm.so [0x621c2a0]
#15 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/client/libjvm.so(JVM_DoPrivileged+0x363) [0x6272153]
#16 /usr/lib/jvm/java-6-sun-1.6.0.05/jre/lib/i386/libjava.so(Java_java_security_AccessController_doPrivileged__Ljava_security_PrivilegedAction_2+0x3d) [0xb7ce796d]
#17 [0xb5cd5ecd]
#18 [0xb5cced77]
#19 [0xb5ccc249]

Minimal program - Test.java

import java.awt.*;

public class Test {

 public static void main(String[] args) {
  GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
 }
}

Compile with

javac Test.java

Run with

java Test

Version of java is

sun-java6-jre 6-05-0ubuntu1

This is Fujitsu Siemens Si1520 with a Intel 945 integrated graphics

Output from lspci
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)

I have tested on Gutsy, RHEL 4 and Windows and they produce no assert

[Matti Lindell (mlind)]

The message itself is harmless, but annoying. See bug #87947, where libxcb was made to use sloppy locks by default for Hardy. Looks like the backtrace still gets printed.

Novell applied more complex patch, which ouputs a warning instead of the backtrace when using sloppy locks : https://bugzilla.novell.com/attachment.cgi?id=182029.

[Matti Lindell (mlind)]

Timo, would it be possible to omit the backtrace and possibly print a simple warning instead?

[Matti Lindell (mlind)]

The bug where the attachment was is https://bugzilla.novell.com/show_bug.cgi?id=251087