G1 crashes

[Doerr, Martin]

Hi Aleksey,

thanks for pointing me to the JDK-8253081. That seems to be the same issue.

Best regards,
Martin


> -----Original Message-----
> From: Aleksey Shipilev <shade at redhat.com>
> Sent: Dienstag, 15. September 2020 11:47
> To: Doerr, Martin <martin.doerr at sap.com>; hotspot-gc-
> dev at openjdk.java.net
> Subject: Re: G1 crashes
> 
> On 9/15/20 11:40 AM, Doerr, Martin wrote:
> > #  SIGSEGV (0xb) at pc=0x00007f5b557f2d15, pid=77863, tid=79363
> > #
> > # JRE version: OpenJDK Runtime Environment (16.0.0.1) (fastdebug build
> 16.0.0.1-internal+0-adhoc.openjdk.jdk)
> > # Java VM: OpenJDK 64-Bit Server VM (fastdebug 16.0.0.1-internal+0-
> adhoc.openjdk.jdk, mixed mode, sharing, tiered, compressed oops, g1 gc,
> linux-amd64)
> > # Problematic frame:
> > # V  [libjvm.so+0xae1d15]
> G1ParScanThreadState::trim_queue_to_threshold(unsigned int)+0x4b5
> >
> > Stack: [0x00007f5ae7afb000,0x00007f5ae7bfb000],
> sp=0x00007f5ae7bf9930,  free space=1018k
> >
> > Native frames: (J=compiled Java code, A=aot compiled Java code,
> j=interpreted, Vv=VM code, C=native code)
> >
> > V  [libjvm.so+0xae1d15]
> G1ParScanThreadState::trim_queue_to_threshold(unsigned int)+0x4b5
> > V  [libjvm.so+0xb52f1a]
> G1ParScanThreadState::trim_queue_partially()+0x3a
> > V  [libjvm.so+0xb5ad3f]
> G1ScanHRForRegionClosure::scan_heap_roots(HeapRegion*)+0x8ef
> > V  [libjvm.so+0xb4f4dd]
> G1RemSet::scan_heap_roots(G1ParScanThreadState*, unsigned int,
> G1GCPhaseTimes::GCParPhases, G1GCPhaseTimes::GCParPhases)+0x37d
> > V  [libjvm.so+0xa59d83]
> G1EvacuateRegionsTask::scan_roots(G1ParScanThreadState*, unsigned
> int)+0x43
> > V  [libjvm.so+0xa5c187]  G1EvacuateRegionsBaseTask::work(unsigned
> int)+0x57
> > V  [libjvm.so+0x185782c]  GangWorker::loop()+0xac
> > V  [libjvm.so+0x17203f6]  Thread::call_run()+0xf6
> > V  [libjvm.so+0x133b706]  thread_native_entry(Thread*)+0x116
> >
> >
> > siginfo: si_signo: 11 (SIGSEGV), si_code: 1 (SEGV_MAPERR), si_addr:
> 0x0000000f7d7b844c
> >
> > Seem like the thread has loaded garbage from the queue.
> > Is this a known problem?
> 
> I have seen crashes similar to this one:
>    https://bugs.openjdk.java.net/browse/JDK-8253081
> 
> --
> Thanks,
> -Aleksey