JDK11 + ZGC JVM Crash

Roy Zhang roy.sunny.zhang007 at gmail.com
Wed Jul 7 12:12:16 UTC 2021

Dear ZGC Experts,

In our 32G heap Kafka server, our JVM crashed twice, is it due to known ZGC
issues? Thanks in advance!
JDK version: OpenJDK 64-Bit Server VM Corretto-

Excerpt of JVM Crash log:

# A fatal error has been detected by the Java Runtime Environment:
#  SIGSEGV (0xb) at pc=0x00007ffa5b7ea200, pid=4649, tid=4951
# JRE version: OpenJDK Runtime Environment Corretto- (11.0.10+9)
(build 11.0.10+9-LTS)
# Java VM: OpenJDK 64-Bit Server VM Corretto- (11.0.10+9-LTS,
mixed mode, tiered, z gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0xf14200]  ZPage::relocate_object_inner(unsigned long,
unsigned long)+0x90
# No core dump will be written. Core dumps have been disabled. To enable
core dumping, try "ulimit -c unlimited" before starting Java again
# If you would like to submit a bug report, please visit:
#   https://github.com/corretto/corretto-11/issues/

---------------  S U M M A R Y ------------

Command Line: -Xmx32G -Xms32G -XX:+UnlockExperimentalVMOptions -XX:+UseZGC
-Dcom.sun.management.jmxremote.ssl=false -Djava.net.preferIPv4Stack=tr
kafka.Kafka /server/kafka-2.1.1/config/server.properties

Host: Intel(R) Xeon(R) Platinum 8252C CPU @ 3.80GHz, 48 cores, 184G, Amazon
Linux release 2 (Karoo)
Time: Fri Jun 18 03:21:39 2021 UTC elapsed time: 9338153.258651 seconds
(108d 1h 55m 53s)

---------------  T H R E A D  ---------------

Current thread (0x00007ffa54074ff0):  GCTaskThread "ZWorker#23" [stack:
0x00007ffa3c084000,0x00007ffa3c184000] [id=4951]

Stack: [0x00007ffa3c084000,0x00007ffa3c184000],  sp=0x00007ffa3c182bc0,
 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+0xf14200]  ZPage::relocate_object_inner(unsigned long,
unsigned long)+0x90
V  [libjvm.so+0xf1465e]  ZPage::relocate_object(unsigned long)+0x3e
V  [libjvm.so+0xf04ac7]  ZHeap::relocate_object(unsigned long)+0x77
V  [libjvm.so+0xef0c5a]  ZRelocateRootOopClosure::do_oop(oopDesc**)+0x6a
V  [libjvm.so+0xf0f066]  ZNMethodTable::oops_do(OopClosure*)+0x116
V  [libjvm.so+0xf1c97a]  ZRootsIterator::oops_do(OopClosure*, bool)+0x43a
V  [libjvm.so+0xf1aa15]  ZRelocateRootsTask::work()+0x25
V  [libjvm.so+0xf2679c]  ZTask::GangTask::work(unsigned int)+0x1c
V  [libjvm.so+0xee7b83]  GangWorker::loop()+0x43
V  [libjvm.so+0xe502dd]  Thread::call_run()+0x14d
V  [libjvm.so+0xc0469c]  thread_native_entry(Thread*)+0xec


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