Invalid Memory Access with GLGraphics

Contributed Library Questions

Jesse Sco..

Invalid Memory Access with GLGraphics

in Contributed Library Questions • 2 years ago

Hi Andres, et al,

I have a sketch that is using GLGraphics as the renderer, with an OffScreenBuffer and a TextureWindow...

I have two erase functions

void eraseBuffer() {
color c = color(0,0);
canvas.beginDraw();
canvas.clear(0,0,0,0);
canvas.endDraw();
}
//-----------------------------------------------------------------------------------------
void eraseAll() {
background(0); // reset background
recorder.clear(); // clear gml
numDrips = 0; // delete drips
eraseBuffer(); // set buffer pixels to black
}

One for the GLGraphicsBuffer, one for everything else... this works fine when called from a CP5 bang - i.e.

void CLEAR(boolean theFlag) {
if(theFlag == true) {
println("ERASING");
eraseAll();
}
}

but I also have an Android Remote Control sketch, where I use OSCP5..

else if(msg.checkAddrPattern("/clearMSG") && msg.checkTypetag("i")) {
println("Got Clear Msg");
clearMSG = msg.get(0).intValue();
if(clearMSG == 1) {
eraseAll();
clearMSG = 0;
}
}

but calling eraseAll() or erase() from here is crashing my sketch with an Invalid Memory Access error.

If I comment out the background(0) in the eraseAll() function and the entire eraseBuffer() function, it won't crash...

This is what's printing to the PDE console:

Invalid memory access of location 0x0 eip=0x93cac1d4

(sounds too much like C/C++ to me!)

And this is the Crash Report:

Process: java [5017]

Path: /usr/bin/java

Identifier: com.apple.javajdk16.cmd

Version: 1.0 (1.0)

Code Type: X86 (Native)

Parent Process: JavaApplicationStub [1592]

PlugIn Path: /Applications/Processing/Processing.app/Contents/Resources/Java/modes/java/libraries/opengl/library/macosx/libjogl.jnilib

PlugIn Identifier: libjogl.jnilib

PlugIn Version: ??? (???)

Date/Time: 2011-09-27 15:24:46.359 +0200

OS Version: Mac OS X 10.6.8 (10K549)

Report Version: 6

Interval Since Last Report: 86284 sec

Crashes Since Last Report: 20

Per-App Interval Since Last Report: 23793 sec

Per-App Crashes Since Last Report: 19

Anonymous UUID: D433F9D2-DDA7-4959-B4F3-86BA02009942

Exception Type: EXC_BAD_ACCESS (SIGBUS)

Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000

Crashed Thread: 27 Java: Thread-3

Application Specific Information:

Java information:

Exception type: Bus Error (0xa) at pc=0000000093cac1d4

Java VM: Java HotSpot(TM) Client VM (20.1-b02-384 mixed mode macosx-x86)

Current thread (000000004d862000): JavaThread "Thread-3" [_thread_in_native, id=-1315184640, stack(00000000b18be000,00000000b19be000)]

Stack: [00000000b18be000,00000000b19be000]

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)

j com.sun.opengl.impl.GLImpl.glClearColor(FFFF)V+0

j processing.opengl.PGraphicsOpenGL.backgroundImpl()V+17

j processing.core.PGraphics.backgroundFromCalc()V+122

j processing.core.PGraphics.background(I)V+6

j bombIR.eraseAll()V+5

j bombIR.CLEAR(Z)V+11

j bombIR.oscEvent(LoscP5/OscMessage;)V+326

v ~StubRoutines::call_stub

j sun.reflect.NativeMethodAccessorImpl.invoke0(Ljava/lang/reflect/Method;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+0

j sun.reflect.NativeMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+87

j sun.reflect.DelegatingMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+6

j java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+161

j oscP5.OscP5.invoke(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)V+3

j oscP5.OscP5.callMethod(LoscP5/OscMessage;)V+307

j oscP5.OscP5.process(Ljava/net/DatagramPacket;I)V+72

j oscP5.OscNetManager.process(Ljava/net/DatagramPacket;I)V+26

j netP5.AbstractUdpServer.run()V+96

j java.lang.Thread.run()V+11

v ~StubRoutines::call_stub

Java Threads: ( => current thread )

000000004d868800 JavaThread "Poller SunPKCS11-Darwin" daemon [_thread_blocked, id=-1312014336, stack(00000000b1bc4000,00000000b1cc4000)]

000000000184f400 JavaThread "Image Fetcher 1" daemon [_thread_blocked, id=-1313071104, stack(00000000b1ac2000,00000000b1bc2000)]

000000000184ec00 JavaThread "Thread-4" [_thread_blocked, id=-1314127872, stack(00000000b19c0000,00000000b1ac0000)]

=>000000004d862000 JavaThread "Thread-3" [_thread_in_native, id=-1315184640, stack(00000000b18be000,00000000b19be000)]

0000000001801000 JavaThread "DestroyJavaVM" [_thread_blocked, id=-1341124608, stack(00000000b0001000,00000000b0101000)]

0000000002038000 JavaThread "Animation Thread" [_thread_blocked, id=-1316241408, stack(00000000b17bc000,00000000b18bc000)]

0000000002035800 JavaThread "Image Fetcher 0" daemon [_thread_blocked, id=-1317298176, stack(00000000b16ba000,00000000b17ba000)]

0000000006133000 JavaThread "AWT-EventQueue-0" [_thread_blocked, id=-1318354944, stack(00000000b15b8000,00000000b16b8000)]

0000000002049400 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=-1319411712, stack(00000000b14b6000,00000000b15b6000)]

0000000001832c00 JavaThread "AWT-Shutdown" [_thread_blocked, id=-1321037824, stack(00000000b1329000,00000000b1429000)]

0000000001832400 JavaThread "AWT-AppKit" daemon [_thread_in_native, id=-1610267328, stack(00000000bf800000,00000000c0000000)]

0000000001819800 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=-1323151360, stack(00000000b1125000,00000000b1225000)]

0000000002005c00 JavaThread "C1 CompilerThread0" daemon [_thread_blocked, id=-1324208128, stack(00000000b1023000,00000000b1123000)]

0000000001813c00 JavaThread "JDWP Command Reader" daemon [_thread_in_native, id=-1325264896, stack(00000000b0f21000,00000000b1021000)]

0000000002004c00 JavaThread "JDWP Event Helper Thread" daemon [_thread_blocked, id=-1326321664, stack(00000000b0e1f000,00000000b0f1f000)]

0000000002003c00 JavaThread "JDWP Transport Listener: dt_socket" daemon [_thread_blocked, id=-1327378432, stack(00000000b0d1d000,00000000b0e1d000)]

000000004d805400 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=-1328435200, stack(00000000b0c1b000,00000000b0d1b000)]

000000004d804400 JavaThread "Surrogate Locker Thread (Concurrent GC)" daemon [_thread_blocked, id=-1329491968, stack(00000000b0b19000,00000000b0c19000)]

000000000180bc00 JavaThread "Finalizer" daemon [_thread_blocked, id=-1331613696, stack(00000000b0913000,00000000b0a13000)]

000000000180ac00 JavaThread "Reference Handler" daemon [_thread_blocked, id=-1332670464, stack(00000000b0811000,00000000b0911000)]

Other Threads:

0000000001808400 VMThread [stack: 00000000b070f000,00000000b080f000] [id=-1333727232]

000000000181b000 WatcherThread [stack: 00000000b1227000,00000000b1327000] [id=-1322094592]

VM state:not at safepoint (normal execution)

VM Mutex/Monitor currently owned by a thread: None

Heap

par new generation total 14784K, used 2275K [0000000006800000, 0000000007800000, 000000000a800000)

eden space 13184K, 6% used [0000000006800000, 00000000068e4960, 00000000074e0000)

from space 1600K, 85% used [0000000007670000, 00000000077c42a8, 0000000007800000)

to space 1600K, 0% used [00000000074e0000, 00000000074e0000, 0000000007670000)

concurrent mark-sweep generation total 49152K, used 5181K [000000000a800000, 000000000d800000, 0000000046800000)

concurrent-mark-sweep perm gen total 12288K, used 11706K [0000000046800000, 0000000047400000, 000000004a800000)

Code Cache [0000000003801000, 0000000003912000, 0000000005801000)

total_blobs=705 nmethods=331 adapters=318 free_code_cache=32483712 largest_free_block=11776

Virtual Machine Arguments:

JVM Args: -Xrunjdwp:transport=dt_socket,address=127.0.0.1:8331,suspend=y -Xms64m -Xmx1024m -Djava.library.path=/Users/jessescott/Documents/Processing/CODE/GRL/bombIR/code:/Users/jessescott/Documents/Processing/libraries/controlP5/library:/Users/jessescott/Documents/Processing/libraries/oscP5/library:/Applications/Processing/Processing.app/Contents/Resources/Java/modes/java/libraries/opengl/library/macosx:/Users/jessescott/Documents/Processing/libraries/GLGraphics/library:/Users/jessescott/Documents/Processing/libraries/GML4U/library:/Applications/Processing/Processing.app/Contents/Resources/Java:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources:.:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java -ea

Java Command: processing.core.PApplet --location=65,35 --external --display=1 --sketch-path=/Users/jessescott/Documents/Processing/CODE/GRL/bombIR bombIR

Launcher Type: SUN_STANDARD

Physical Memory: Page Size = 4k, Total = 3968M, Free = 1571M

....

Replies(2)

andres

Re: Invalid Memory Access with GLGraphics

2 years ago

This is a crash in the native code (in this case opengl), outside the Java VM.

It might caused by a threading issue. One important thing is keep in mind when using opengl is that you can issue opengl calls only from the thread where the opengl context was originally created.

For instance, this simple sketch should trigger a similar crash to the one you see:

import processing.opengl.*;
import codeanticode.glgraphics.*;
TestThread test;
void setup() {
size(400, 400, GLConstants.GLGRAPHICS);
test = new TestThread();
test.start();
}
void draw() {
background(0);
}
class TestThread extends Thread {
public void run() {
// Any drawing call here (because it is eventually
// executed by OpenGL since the renderer is
// GLGraphics) will result in a crash since it
// is being issued from a thread different from
// the main PApplet thread where the OpenGL context
// was created by the GLGraphics renderer.
background(0);
}
}

Jesse Sco..

Re: Invalid Memory Access with GLGraphics

2 years ago

Ok... makes sense.

So, is the solution to make discrete threads that extend/listen to a main thread, and how would I code this in a safe way that would allow code in one thread to be called from another one ?

Thanks Andres...

~ J

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