Happens reliably on x86_32:

Command line: ['/home/buildbot/worker/jdkX-linux/build/build/linux-x86-server-fastdebug/images/jdk/bin/java' '-XX:MaxRAMPercentage=1' '-cp' '/home/buildbot/worker/jdkX-linux/build/build/linux-x86-server-fastdebug/test-support/jtreg_test_hotspot_jtreg_tier1/classes/4/serviceability/sa/ClhsdbJstack.d:/home/buildbot/worker/jdkX-linux/build/build/linux-x86-server-fastdebug/test-support/jtreg_test_hotspot_jtreg_tier1/classes/4/test/lib' 'jdk.test.lib.apps.LingeredApp' '43189f67-6857-4491-896e-5f96628f6a41.lck' ]
Attaching to process 122786, please wait...
Warning: Nashorn engine is planned to be removed from a future JDK release
javax.script.ScriptException: TypeError: sapkg.runtime.VM.getVM is not a function in sa.js at line number 54
javax.script.ScriptException: TypeError: sapkg.runtime.VM.getVM is not a function in sa.js at line number 54
Exception in thread "Thread-2" java.lang.UnsatisfiedLinkError: 'long[] sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.getThreadIntegerRegisterSet0(int)'
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.getThreadIntegerRegisterSet0(Native Method)
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$1GetThreadIntegerRegisterSetTask.doit(LinuxDebuggerLocal.java:532)
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.run(LinuxDebuggerLocal.java:151)
 stdout: [Warning! JS Engine can't start, some commands will not be available.

The observable "failure" is test timeout, but the log above says there is UnsatisfiedLinkError caught in one of the threads.