guarantee(l_om_in_use_count == in_use_count) failed

[Doerr, Martin]

Hi David,

thanks for your quick reply.
I've filed https://bugs.openjdk.java.net/browse/JDK-8246676

Unfortunately, I don't have much information and no reproducer.
But there may be a chance to find it by reading code.

I'll check my emails next week though I'm on vacation (I'll be really out afterwards).

Best regards,
Martin


> -----Original Message-----
> From: David Holmes <david.holmes at oracle.com>
> Sent: Freitag, 5. Juni 2020 03:54
> To: Doerr, Martin <martin.doerr at sap.com>; hotspot-runtime-
> dev at openjdk.java.net
> Subject: Re: guarantee(l_om_in_use_count == in_use_count) failed
> 
> Hi Martin,
> 
> That is a new assertion that is failing, relating to the async monitor
> deflation logic - JDK-8153224 - as you surmised.
> 
> We haven't seen any failures of this kind that I am aware of.
> 
> Please file a bug and assign to Dan (dcubed).
> 
> Thanks,
> David
> 
> On 5/06/2020 3:22 am, Doerr, Martin wrote:
> > Hi,
> >
> > I've seen the following guarantee on PPC64le when a thread was about to
> exit:
> > #  Internal Error (synchronizer.cpp:1677), pid=47037, tid=47409
> > #  guarantee(l_om_in_use_count == in_use_count) failed: in-use counts
> don't match: l_om_in_use_count=2, in_use_count=1
> >
> > Stack: [0x00003ffe13000000,0x00003ffe13200000],  sp=0x00003ffe131fe180,
> free space=2040k
> > Native frames: (J=compiled Java code, A=aot compiled Java code,
> j=interpreted, Vv=VM code, C=native code)
> > V  [libjvm.so+0xe5e450]  ObjectSynchronizer::om_flush(Thread*)+0x710
> > V  [libjvm.so+0xeb0cac]  Threads::remove(JavaThread*, bool)+0x3c
> > V  [libjvm.so+0xeb6840]  JavaThread::exit(bool,
> JavaThread::ExitType)+0x830
> > V  [libjvm.so+0xeb6aa0]  JavaThread::post_run()+0x30
> > V  [libjvm.so+0xeb3d88]  Thread::call_run()+0x198
> > V  [libjvm.so+0xcb11d4]  thread_native_entry(Thread*)+0x154
> > C  [libpthread.so.0+0x8a64]  start_thread+0xf4
> >
> > Issue doesn't seem to be reproducible with the proprietary test.
> > Tip was
> > http://hg.openjdk.java.net/jdk/jdk/rev/755ab9edca97
> >
> > I guess it could be related to
> > https://bugs.openjdk.java.net/browse/JDK-8153224
> >
> > Is anybody aware of this issue?
> >
> > Best regards,
> > Martin
> >