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Re: [libvirt-users] [libvirt] JVM crashes during GC



Did you get a chance to debug the issue?

Thanks & Regards,
Sachin Soman
   

On Thu, Apr 18, 2019, 11:10 PM Sachin Soman <sachonline soman gmail com> wrote:
I have tried the same tests using the "test" driver, and that works perfectly; no errors seen.

Thanks & Regards
Sachin Soman

 


On Thu, Apr 18, 2019 at 11:03 PM Daniel P. Berrangé <berrange redhat com> wrote:
On Thu, Apr 18, 2019 at 10:46:19PM +0530, Sachin Soman wrote:
> I am attaching the execution results. At the top of each file I have
> mentioned the environment details.
>
> Following is the test program I have used:
>
> ==================================================
>
> *package* org.libvirt;
>
>
> *import* org.libvirt.jna.Libvirt;
>
>
> *public* *class* LibvirtCrashTest {
>
> *void* createAndDestroyDefaultAuthConnection() {
>
> ConnectAuth ca = *new* ConnectAuthDefault();
>
> *try* {
>
> System.*out*.println("Starting new connection with default auth");
>
> Connect connect = *new* Connect("esx://x.x.x.x/?no_verify=1", ca, 0);

It could be interesting to try different libvirt drivers.

eg "test:///default"

this could help identify if its a bug in libvirt common code
vs a bug in only the ESX driver code.

>
> Thread.*sleep*(1000);
>
> System.*out*.println("Explicit connection closure");
>
> connect.close();
>
> Thread.*sleep*(5000);
>
> } *catch* (Exception e) {
>
> e.printStackTrace();
>
> }
>
> }
>
>
> *public* *static* *void* main(String[] args) *throws* Exception {
>
> LibvirtCrashTest testInstance = *new* LibvirtCrashTest();
>
>
> *for*(*int* counter = 0; counter < 3; counter++) {
>
> testInstance.createAndDestroyDefaultAuthConnection();
>
> System.*out*.println("gc'ing");
>
> System.*gc*();
>
> System.*out*.println("gc'd");
>
> *int* tCounter = 0;
>
> *while*(tCounter++ < 20) {
>
> System.*out*.println("waiting.. " + tCounter);
>
> Thread.*sleep*(1000);
>
> }
>
> }
>
> System.*out*.println("Going down...");
>
> }
>
>
> }
> ==================================================
>
>
> Thanks & Regards
> Sachin Soman
>
>
>
>
> On Thu, Apr 18, 2019 at 9:25 PM Daniel P. Berrangé <berrange redhat com>
> wrote:
>
> > On Thu, Apr 18, 2019 at 05:51:06PM +0200, Michal Prívozník wrote:
> > > On 4/17/19 10:24 AM, Sachin Soman wrote:
> > > > Hi,
> > > >
> > > > Could you tell me if the following is some known issue?
> > > >
> > > > While performing the following simple test, I see my JVM crashing
> > > > (consistently):
> > > > 1. Open a connection to an ESXi driver/host (passing ConnectAuthDefault
> > > > instance).
> > > > 2. Close the connection.
> > > > 3. Invoke GC
> > > >
> > > > When GC is triggered, at some point, some unallocated native memory is
> > > > being tried to release. That's failing.
> > > >
> > > > The error thrown is:
> > > >
> > > > java(78745,0x70000241e000) malloc: *** error for object 0x7fd5df561390:
> > > > pointer being freed was not allocated
> > > >
> > > > *** set a breakpoint in malloc_error_break to debug
> > > >
> > > >
> > > > Frames from core dump:
> > > >
> > > >     frame #0: 0x00007fff5b274b66 libsystem_kernel.dylib`__pthread_kill
> > + 10
> > > >
> > > >     frame #1: 0x00007fff5b43f080 libsystem_pthread.dylib`pthread_kill
> > + 333
> > > >
> > > >     frame #2: 0x00007fff5b1d01ae libsystem_c.dylib`abort + 127
> > > >
> > > >     frame #3: 0x00007fff5b2ce8a6 libsystem_malloc.dylib`free + 521
> > > >
> > > >     frame #4: 0x00000001127f43a7
> > > >
> > > >     frame #5: 0x00000001127e3ffd
> > > >
> > > >     frame #6: 0x00000001127e3ffd
> > > >
> > > >     frame #7: 0x00000001127e3ffd
> > > >
> > > >     frame #8: 0x00000001127e3ffd
> > > >
> > > >     frame #9: 0x00000001127e4042
> > > >
> > > >     frame #10: 0x00000001127e3ffd
> > > >
> > > >     frame #11: 0x00000001127e3ffd
> > > >
> > > >     frame #12: 0x00000001127dc4e7
> > > >
> > > >     frame #13: 0x000000010c0e235e
> > > > libjvm.dylib`JavaCalls::call_helper(JavaValue*, methodHandle*,
> > > > JavaCallArguments*, Thread*) + 1710
> > > >
> > > >     frame #14: 0x000000010c0e2b02
> > > > libjvm.dylib`JavaCalls::call_virtual(JavaValue*, KlassHandle, Symbol*,
> > > > Symbol*, JavaCallArguments*, Thread*) + 356
> > > >
> > > >     frame #15: 0x000000010c0e2cae
> > > > libjvm.dylib`JavaCalls::call_virtual(JavaValue*, Handle, KlassHandle,
> > > > Symbol*, Symbol*, Thread*) + 74
> > > >
> > > >     frame #16: 0x000000010c1208ee
> > libjvm.dylib`thread_entry(JavaThread*,
> > > > Thread*) + 124
> > > >
> > > >     frame #17: 0x000000010c33e84d
> > > > libjvm.dylib`JavaThread::thread_main_inner() + 155
> > > >
> > > >     frame #18: 0x000000010c33ff12 libjvm.dylib`JavaThread::run() + 448
> > > >
> > > >     frame #19: 0x000000010c26058a libjvm.dylib`java_start(Thread*) +
> > 246
> > > >
> > > >     frame #20: 0x00007fff5b43c661
> > libsystem_pthread.dylib`_pthread_body +
> > > > 340
> > > >
> > > >     frame #21: 0x00007fff5b43c50d
> > libsystem_pthread.dylib`_pthread_start +
> > > > 377
> > > >
> > > >     frame #22: 0x00007fff5b43bbf9 libsystem_pthread.dylib`thread_start
> > + 13
> > > >
> > > >
> > > > I have installed Libvirt 5.2.0.
> > > > Java bindings libvirt-java 0.5.1
> > > > JNA 4.0.0
> > > > Tested Java environments: Oracle Java 8 and OpenJDK 8 on MAC, OpenJDK
> > 11 on
> > > > Ubuntu 16
> > >
> > > The backtrace does not suggest it's libvirt related, but I wouldn't be
> > > surprised if our Java bindings mangled memory somewhere. They are
> > > heavily unmaintained.
> >
> > It could just as easily be a memory corruption bug in the ESX libvirt
> > driver, since that runs directly in the applicatin process as it is a
> > stateless client side driver.
> >
> > We would probably need to have an small demo program that can reproduce
> > the problem in an isolated fashion, in order to try to debug it, along
> > with full libvirt debug logs.
> >
> >
> > Regards,
> > Daniel
> > --
> > |: https://berrange.com      -o-
> > https://www.flickr.com/photos/dberrange :|
> > |: https://libvirt.org         -o-
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> > |: https://entangle-photo.org    -o-
> > https://www.instagram.com/dberrange :|
> >








Regards,
Daniel
--
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|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
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