Seeing the following failure multiple times with serviceability/sa/TestJhsdbJstackMixed.java on linux-aarch64:

sun.jvm.hotspot.debugger.UnmappedAddressException: e0a646adbd850
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.PageCache.checkPage(PageCache.java:208)
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.PageCache.getData(PageCache.java:63)
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.DebuggerBase.readBytes(DebuggerBase.java:225)
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.readCInteger(LinuxDebuggerLocal.java:567)
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.DebuggerBase.readAddressValue(DebuggerBase.java:462)
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.readAddress(LinuxDebuggerLocal.java:502)
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.LinuxAddress.getAddressAt(LinuxAddress.java:74)
at jdk.hotspot.agent/sun.jvm.hotspot.debugger.linux.aarch64.LinuxAARCH64CFrame.sender(LinuxAARCH64CFrame.java:69)
at jdk.hotspot.agent/sun.jvm.hotspot.tools.PStack.run(PStack.java:174)
at jdk.hotspot.agent/sun.jvm.hotspot.tools.PStack.run(PStack.java:58)
at jdk.hotspot.agent/sun.jvm.hotspot.tools.PStack.run(PStack.java:53)
at jdk.hotspot.agent/sun.jvm.hotspot.tools.JStack.run(JStack.java:67)
at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:262)
at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.start(Tool.java:225)
at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at jdk.hotspot.agent/sun.jvm.hotspot.tools.JStack.runWithArgs(JStack.java:90)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runJSTACK(SALauncher.java:300)
at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:483)

This might be related to JDK-8247641 and JDK-8247762