Crash with fatal error: DEBUG MESSAGE: Fast Unlock lock on stack

ADDITIONAL SYSTEM INFORMATION :
# JRE version: OpenJDK Runtime Environment (23.0) (fastdebug build 23-internal-adhoc.user.jdk23u)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 23-internal-adhoc.user.jdk23u, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)

The jdk used is compiled from source code downloaded from GitHub jdk repo.

A DESCRIPTION OF THE PROBLEM :
I ran a testcase on jdk23u-fastdebug and the process crashed with fatal error.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
java Test

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
running without error
ACTUAL -
crash with fatal error

---------- BEGIN SOURCE ----------
class Test {

  int a = 400;

  void q() {
    int e;
    synchronized (new Double(1.1f)) {
      int[] f = new int[a];
      synchronized (Test.class) {
        for (int d = 4; d < 127; d++) {
          e = 13;
          do switch (d * 5) {
            case 0:
            case 42:
            case 29:
              e = d;
            default:
              f[1] = e;
          } while (--e > 0);
        }
      }
    }
  }

  void n() {
    for (int j = 6; j < 274; ++j) q();
  }

  public static void main(String[] p) {
    Test r = new Test();
    for (int i = 0; i < 10; i++) r.n();
  }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
remove the first synchronized lock in the testcase

FREQUENCY : always


# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/data/user/jdk23u/src/hotspot/cpu/x86/macroAssembler_x86.cpp:832), pid=919609, tid=919610
# fatal error: DEBUG MESSAGE: Fast Unlock lock on stack
#
# JRE version: OpenJDK Runtime Environment (23.0) (fastdebug build 23-internal-adhoc.user.jdk23u)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 23-internal-adhoc.user.jdk23u, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x1343df9] MacroAssembler::debug64(char*, long, long*)+0x49

Stack: [0x0000758da8900000,0x0000758da8a00000], sp=0x0000758da89fe770, free space=1017k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x1343df9] MacroAssembler::debug64(char*, long, long*)+0x49 (macroAssembler_x86.cpp:832)
Registers:
RAX=0x0000758dab0ec000, RBX=0x0000758daa63179f, RCX=0x0000758daa7363d7, RDX=0x0000000000000340
RSP=0x0000758da89fe770, RBP=0x0000758da89fe7a0, RSI=0x0000758daa736a48, RDI=0x00000000e0000000
R8 =0x0000758daa63179f, R9 =0x0000000000000276, R10=0x00000060addb5400, R11=0x000000011e16fad0
R12=0x0000000000000000, R13=0x000000000000000b, R14=0x000000000000007f, R15=0x0000758da4028850
RIP=0x0000758da9d43df9, EFLAGS=0x0000000000010246, CSGSFS=0x002b000000000033, ERR=0x0000000000000006
  TRAPNO=0x000000000000000e