The following new test is failing in the JDK21 CI:

runtime/Monitor/GuaranteedAsyncDeflationIntervalTest.java#allEnabled

Here's a snippet from the log file:

----------System.err:(98/9947)----------
 stdout: [[5.824s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5815 ms)
[5.824s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=1123, max=1123
[5.824s][info][monitorinflation] before handshaking: unlinked_count=1121, in_use_list stats: ceiling=11264, count=2, max=1123
[5.824s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=2, max=1123
[5.825s][info][monitorinflation] deflated_count=1121, {unlinked,deleted}_count=1121 monitors in 0.0003808 secs
[5.825s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=2, max=1123
[11.571s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5746 ms)
[11.571s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=1012, max=1123
[11.571s][info][monitorinflation] before handshaking: unlinked_count=1010, in_use_list stats: ceiling=11264, count=2, max=1123
[11.571s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=2, max=1123
[11.571s][info][monitorinflation] deflated_count=1010, {unlinked,deleted}_count=1010 monitors in 0.0003291 secs
[11.571s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=2, max=1123
[17.314s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5743 ms)
[17.314s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=1076, max=1123
[17.314s][info][monitorinflation] before handshaking: unlinked_count=1074, in_use_list stats: ceiling=11264, count=3, max=1123
[17.314s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=3, max=1123
[17.314s][info][monitorinflation] deflated_count=1074, {unlinked,deleted}_count=1074 monitors in 0.0003861 secs
[17.314s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=3, max=1123
[22.885s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5571 ms)
[22.885s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=718, max=1123
[22.885s][info][monitorinflation] before handshaking: unlinked_count=717, in_use_list stats: ceiling=11264, count=2, max=1123
[22.885s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=2, max=1123
[22.886s][info][monitorinflation] deflated_count=717, {unlinked,deleted}_count=717 monitors in 0.0002403 secs
[22.886s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=2, max=1123
[28.399s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5514 ms)
[28.399s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=1083, max=1123
[28.400s][info][monitorinflation] before handshaking: unlinked_count=1081, in_use_list stats: ceiling=11264, count=2, max=1123
[28.400s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=2, max=1123
[28.400s][info][monitorinflation] deflated_count=1081, {unlinked,deleted}_count=1081 monitors in 0.0003843 secs
[28.400s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=2, max=1123
[34.046s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5647 ms)
[34.046s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=1046, max=1123
[34.047s][info][monitorinflation] before handshaking: unlinked_count=1044, in_use_list stats: ceiling=11264, count=3, max=1123
[34.047s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=3, max=1123
[34.047s][info][monitorinflation] deflated_count=1044, {unlinked,deleted}_count=1044 monitors in 0.0004321 secs
[34.047s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=3, max=1123
[39.546s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5499 ms)
[39.546s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=929, max=1123
[39.546s][info][monitorinflation] before handshaking: unlinked_count=927, in_use_list stats: ceiling=11264, count=2, max=1123
[39.546s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=2, max=1123
[39.547s][info][monitorinflation] deflated_count=927, {unlinked,deleted}_count=927 monitors in 0.0002978 secs
[39.547s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=2, max=1123
[45.168s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5621 ms)
[45.168s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=937, max=1123
[45.168s][info][monitorinflation] before handshaking: unlinked_count=935, in_use_list stats: ceiling=11264, count=3, max=1123
[45.168s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=3, max=1123
[45.168s][info][monitorinflation] deflated_count=935, {unlinked,deleted}_count=935 monitors in 0.0003150 secs
[45.168s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=3, max=1123
[50.531s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5362 ms)
[50.531s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=902, max=1123
[50.531s][info][monitorinflation] before handshaking: unlinked_count=900, in_use_list stats: ceiling=11264, count=2, max=1123
[50.531s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=2, max=1123
[50.531s][info][monitorinflation] deflated_count=900, {unlinked,deleted}_count=900 monitors in 0.0003153 secs
[50.531s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=2, max=1123
[56.104s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5573 ms)
[56.104s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=1020, max=1123
[56.105s][info][monitorinflation] before handshaking: unlinked_count=1018, in_use_list stats: ceiling=11264, count=3, max=1123
[56.105s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=3, max=1123
[56.105s][info][monitorinflation] deflated_count=1018, {unlinked,deleted}_count=1018 monitors in 0.0003662 secs
[56.105s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=3, max=1123
[61.543s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5438 ms)
[61.543s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=174, max=1123
[61.543s][info][monitorinflation] before handshaking: unlinked_count=173, in_use_list stats: ceiling=11264, count=1, max=1123
[61.543s][info][monitorinflation] after handshaking: in_use_list stats: ceiling=11264, count=1, max=1123
[61.543s][info][monitorinflation] deflated_count=173, {unlinked,deleted}_count=173 monitors in 0.0000727 secs
[61.543s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=1, max=1123
[67.200s][info][monitorinflation] Async deflation needed: guaranteed interval (5000 ms) is greater than time since last deflation (5657 ms)
[67.200s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=11264, count=1, max=1123
[67.200s][info][monitorinflation] end deflating: in_use_list stats: ceiling=11264, count=1, max=1123
[67.326s][info][monitorinflation] Starting the final audit.
[67.326s][info][monitorinflation] begin deflating: in_use_list stats: ceiling=10240, count=1, max=1123
[67.326s][info][monitorinflation] end deflating: in_use_list stats: ceiling=10240, count=1, max=1123
[67.326s][info][monitorinflation] Checking in_use_list:
[67.326s][info][monitorinflation] count=1, max=1123
[67.326s][info][monitorinflation] in_use_count=1 equals ck_in_use_count=1
[67.326s][info][monitorinflation] in_use_max=1123 equals ck_in_use_max=1123
[67.326s][info][monitorinflation] No errors found in in_use_list checks.
[67.326s][info][monitorinflation] In-use monitor info:
[67.326s][info][monitorinflation] (B -> is_busy, H -> has hash code, L -> lock status)
[67.326s][info][monitorinflation] monitor BHL object object type
[67.326s][info][monitorinflation] ================== === ================== ==================
[67.326s][info][monitorinflation] 0x00007f8304607540 100 0x00000007ffd01670 java.lang.ref.NativeReferenceQueue$Lock (is_busy: waiters=1, contentions=0owner=0x0000000000000000, cxq=0x0000000000000000, EntryList=0x0000000000000000)
];
 stderr: []
 exitValue = 0

java.lang.RuntimeException: 'Async deflation needed: monitors used are above the threshold' missing from stdout/stderr
at jdk.test.lib.process.OutputAnalyzer.shouldContain(OutputAnalyzer.java:221)
at GuaranteedAsyncDeflationIntervalTest.testAllEnabled(GuaranteedAsyncDeflationIntervalTest.java:180)
at GuaranteedAsyncDeflationIntervalTest.main(GuaranteedAsyncDeflationIntervalTest.java:102)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
at java.base/java.lang.Thread.run(Thread.java:1592)

JavaTest Message: Test threw exception: java.lang.RuntimeException
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: 'Async deflation needed: monitors used are above the threshold' missing from stdout/stderr