ADDITIONAL SYSTEM INFORMATION :
# JRE version: OpenJDK Runtime Environment (17.0.11) (fastdebug build 17.0.11-internal+0-adhoc.user.jdk17u-dev)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 17.0.11-internal+0-adhoc.user.jdk17u-dev, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)

A DESCRIPTION OF THE PROBLEM :
Running the following test case with the fastdebug version of jdk17u-dev results in a crash without any additional options. This situation occurs approximately once in every 10 executions.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
java Test

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Runs normally and finishes within one second.
ACTUAL -
[0.375s][error][monitorinflation] ERROR: ObjectMonitor::exit(): thread=0x00007fc98c029930 is exiting an ObjectMonitor it does not own.
[0.376s][error][monitorinflation] The imbalance is possibly caused by JNI locking.
[0.376s][error][monitorinflation] (ObjectMonitor*) 0x00007fc98c6a48e0 = {
[0.376s][error][monitorinflation] _header = 0x0000007f63425a01
[0.376s][error][monitorinflation] _object = 0x0000000101f19200
[0.376s][error][monitorinflation] _pad_buf0 = {
[0.376s][error][monitorinflation] [0] = '\0'
[0.376s][error][monitorinflation] ...
[0.376s][error][monitorinflation] [47] = '\0'
[0.376s][error][monitorinflation] }
[0.376s][error][monitorinflation] _owner = 0x0000000000000000
[0.376s][error][monitorinflation] _previous_owner_tid = 0
[0.376s][error][monitorinflation] _pad_buf1 = {
[0.376s][error][monitorinflation] [0] = '\0'
[0.376s][error][monitorinflation] ...
[0.376s][error][monitorinflation] [47] = '\0'
[0.376s][error][monitorinflation] }
[0.376s][error][monitorinflation] _next_om = 0x00007fc8e8000fd0
[0.376s][error][monitorinflation] _recursions = 0
[0.376s][error][monitorinflation] _EntryList = 0x0000000000000000
[0.376s][error][monitorinflation] _cxq = 0x0000000000000000
[0.376s][error][monitorinflation] _succ = 0x0000000000000000
[0.376s][error][monitorinflation] _Responsible = 0x0000000000000000
[0.376s][error][monitorinflation] _Spinner = 0
[0.376s][error][monitorinflation] _SpinDuration = 5000
[0.376s][error][monitorinflation] _contentions = 0
[0.376s][error][monitorinflation] _WaitSet = 0x0000000000000000
[0.376s][error][monitorinflation] _waiters = 0
[0.376s][error][monitorinflation] _WaitSetLock = 0
[0.376s][error][monitorinflation] }
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/objectMonitor.cpp:1158
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/data/user/jdk17u-dev/src/hotspot/share/runtime/objectMonitor.cpp:1158), pid=17712, tid=17713
# assert(false) failed: Non-balanced monitor enter/exit!
#
# JRE version: OpenJDK Runtime Environment (17.0.11) (fastdebug build 17.0.11-internal+0-adhoc.xiezf.jdk17u-dev)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 17.0.11-internal+0-adhoc.xiezf.jdk17u-dev, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x138952f] ObjectMonitor::exit(JavaThread*, bool)+0x54f
#
# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /data/user/proj/toreport/Test2887_01_22_13_20_15/reduce/hs_err_pid17712.log
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#


---------- BEGIN SOURCE ----------
class Test {
   public static final int N = 256;
   public long instanceCount;
   static short sFld = 32330;

   static void vMeth() {
      short[] sArr = new short[N];
   }

   long lMeth(int i11, long l) {
      int i12;
      for (i12 = 1; 204 > i12; ++i12)
         vMeth();
      long meth_res = i11;
      return meth_res;
   }

   static synchronized int method47(int var1, int var2) {
      return var1;
   }

   static synchronized int method71(int var) {
      return var;
   }

   boolean bMeth(int i2, int i3) {
      int i4;
      synchronized (Test.class) {
         int i7 = 4;
         int i8;
         for (i4 = 5; i4 < 118; i4++)
            for (i8 = 1; i8 < 5; i8++)
               switch (63) {
                  case 63:
                     int var18 = 0;
                     while (var18 < 20000)
                        var18++;
                  case 64:
                     switch (48) {
                        case 48:
                           sFld = (short) lMeth(i7, instanceCount);
                        case 50:
                           for (int var27 = 2; var27 < 8; var27 += 2)
                              for (int var28 = 1;;) {
                                 int var29 = method47(var27, var28);
                                 int var30 = var27 + method71(var28);
                                 break;
                              }
                     }
               }
         long meth_res = i3;
         return meth_res > 0;
      }
   }

   void mainTest(String[] strArr1) {
      int i1 = -9;
      for (int i = 0; i < 1000; ++i) {
         if (bMeth(6, i1))
            break;
      }
   }

   public static void main(String[] strArr) {
      Test _instance = new Test();
      _instance.mainTest(strArr);
   }
}
---------- END SOURCE ----------

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