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JVM crash on GC with current maven snapshot #18
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From @twitwi on July 2, 2013 7:16
I could try on another machine (linux 64bits, xubuntu 12.10) and it does not crash on GC.
So it seems the problem is contextual (driver? optirun? …)0: GeForce GTX 560 Ti (NVIDIA CUDA) Now GC'ing GC'edThe used GPU is a secondary card (not used for any display).
Hi @twitwi ,
Thank you so much for investigating and providing such a narrowed down test case!
By any chance, have you tried installing AMD Stream? (CPU-only OpenCL implementation)Also, have you made sure the exact same version of Java is being used on both setups? (and have you tried turning compressed oops on/off, just in case?)
Could you also try calling
CLAbstractEntity.release()on each oncontextprior to GC'ing?
And could you put your test in a loop (as done in BridJ's MemoryTest ) to give more chances to xubuntu to fail as well?Finally, a fuller native stack trace might be useful, please do not fear of spamming this issue with a larger log :-)
Cheers
From @twitwi on July 3, 2013 23:20
I tried (on the failing machine) with two versions of java (6 and 7), varying UseCompressedOops and bridj.protected.
Also with the AMD APP as I had it installed before.
The test program is quite simple:public static void main(String[] args) { CLContext context = JavaCL.createBestContext(); CLDevice[] devices = context.getDevices(); for (int i = 0; i < devices.length; i++) { System.err.println(i+": "+devices[i]); } System.err.println("Releasing context"); context.release(); System.err.println("Now GC'ing"); System.gc(); System.err.println("GC'ed"); }Results incoming…
From @twitwi on July 3, 2013 23:36
Overall, with optirun, the only impacting variable is the javacl-core version (RC3 (works) vs SNAPSHOT).
Overall, with amdapp (cpu, no ati card), bridj.protected=true makes the CL platform not found, while RC3 works and SNAPSHOT does the same error.
The java version, UseCompressedOops and releasing the context seem to have no impact.
Details:
http://dl.heeere.com/withoptirun.zip
http://dl.heeere.com/withamdapp.zipScript that produced it:
pre= #optirun for dep in dependency dependency-RC3 ; do for java in java /usr/lib/jvm/java-6-openjdk-amd64/bin/java ; do echo "JAVA: $java" echo $java -version echo for opt in {,-Dbridj.protected=true}" "{,-XX:+UseCompressedOops,-XX:-UseCompressedOops} ; do echo "RUNNING: $pre $java $opt -cp target/DPGMMJavaCL-1.0-SNAPSHOT.jar:target/$dep/* com.heeere.dpgmm.javacl.TestGC" $pre $java $opt -cp target/DPGMMJavaCL-1.0-SNAPSHOT.jar:target/$dep/* com.heeere.dpgmm.javacl.TestGC echo;echo;echo done done doneMaybe, I should bisect the thing if it is not reproducible elsewhere.
Hi @twitwi ,
Thanks for taking the time to investigate, much appreciated!
Bisecting might help but might be non-trivial, since the issue might come from BridJ as well (you'd have to recompile both libraries/BridJ and libraries/OpenCL at each step).
Could you please add a last check with BRIDJ_DIRECT=0 if you have time? (direct mode is also disabled with BRIDJ_PROTECTED=1, but since it mysteriously made the platform to disappear... (which is an issue of its own right, maybe even related)
As for the lib path, I doubt it could cause the issue, although it might be good to see which library BridJ picks, which should be somewhere in the verbose or debug logs.
(if it's not the right lib, providing the full path with-Dbridj.OpenCL.library=/some/path/amdocl64.socould help)I'm now trying to install mint linux :-)
Cheers
Just to check: are you using the Ubuntu-based Linux Mint (the default one), or Linux Mint Debian Edition?
Hi Rémi,
Friendly ping :-)
Cheers
From @ochrons on March 6, 2014 12:54
I seem to be seeing the same error with RC3:
When garbage collector runs, there is an Access Violation error due to CLDevice cleanup (log attached with stack trace etc.)
Using JavaCL 1.0.0-RC3
Environment: Windows 8.1, two OpenCL platforms
Number of devices in platform NVIDIA CUDA: 1
Number of devices in platform Intel(R) OpenCL: 1
--- Info for device Quadro 2000M: ---
CL_DEVICE_NAME: Quadro 2000M
CL_DEVICE_VENDOR: NVIDIA Corporation
CL_DRIVER_VERSION: 331.65
--- Info for device Intel(R) Core(TM) i7-2860QM CPU @ 2.50GHz: ---
CL_DEVICE_NAME: Intel(R) Core(TM) i7-2860QM CPU @ 2.50GHz
CL_DEVICE_VENDOR: Intel(R) Corporation
CL_DRIVER_VERSION: 3.0.1.15216To replicate (simple Scala app):
object Start extends App { override def main(args: Array[String]) = { val oclPlatforms: Array[CLPlatform] = JavaCL.listPlatforms() // list the NVIDIA devices oclPlatforms(0).listAllDevices(true) System.gc() Thread.sleep(1000) } }Same problem when calling JavaCL.getBestDevice()
Getting the CPU devices, on the other hand works ok:
object Start extends App { override def main(args: Array[String]) = { val oclPlatforms: Array[CLPlatform] = JavaCL.listPlatforms() // list the CPU devices oclPlatforms(1).listAllDevices(true) System.gc() Thread.sleep(1000) } }Relevant part of the log dump:
Stack: [0x000000000af20000,0x000000000b020000], sp=0x000000000b01e918, free space=1018k Java frames: (J=compiled Java code, j=interpreted, Vv=VM code) j com.nativelibs4java.opencl.library.OpenCLLibrary.clReleaseDevice(J)I+0 j com.nativelibs4java.opencl.CLDevice.clear()V+7 j com.nativelibs4java.opencl.CLAbstractEntity.doRelease()V+10 j com.nativelibs4java.opencl.CLAbstractEntity.finalize()V+1 v ~StubRoutines::call_stub j java.lang.ref.Finalizer.invokeFinalizeMethod(Ljava/lang/Object;)V+0 j java.lang.ref.Finalizer.runFinalizer()V+45 j java.lang.ref.Finalizer.access$100(Ljava/lang/ref/Finalizer;)V+1 j java.lang.ref.Finalizer$FinalizerThread.run()V+24 v ~StubRoutines::call_stubNeed to try with 1.0.0-RC4
From @twitwi on July 1, 2013 22:16
Hi @ochafik
I have a (now) very simple program that crashes with the latest maven snapshots but works with javacl-1.0.0-RC3.jar.
I run using optirun under linux mint 15, 64bits, with a "NVS 5400M (NVIDIA CUDA)" device. The rest of the program works fine (complicated opencl kernel work) but the GC crashes the VM with:
It might be a temporary issue (or specific to my device) but I prefer to report it.
Rémi
Copied from original issue: nativelibs4java/nativelibs4java#420