RFR: 8192897: NPE occurs on clhsdb jstack

[Yasumasa Suenaga]

Hi David,

I got the result of execution time as below in ClhsdbJstack.jtr:

--------------
#-----testresult-----
description=file\:/home/ysuenaga/OpenJDK/jdk-hs/test/hotspot/jtreg/serviceability/sa/ClhsdbJstack.java
elapsed=24825 0\:00\:24.825
end=Mon Dec 04 09\:41\:41 JST 2017
--------------


Thanks,

Yasumasa



2017-12-04 5:38 GMT+09:00 David Holmes <david.holmes at oracle.com>:
> Hi Yasumasa,
>
>
> On 1/12/2017 11:56 PM, Yasumasa Suenaga wrote:
>>
>> Hi all,
>>
>> I saw NPE when I run jstack on clhsdb as below:
>>
>> ----------------
>> hsdb> jstack
>> Deadlock Detection:
>>
>> No deadlocks found.
>>
>> "NonBlockingInputStreamThread" #27 daemon prio=5 tid=0x00007f0924674000
>> nid=0xf429 in Object.wait() [0x00007f08cf6fd000]
>>     java.lang.Thread.State: WAITING (on object monitor)
>>     JavaThread state: _thread_blocked
>>   - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
>> imprecise)
>>          - waiting on <no object reference available>
>> Error occurred during stack walking:
>> java.lang.NullPointerException
>>          at
>> jdk.hotspot.agent/sun.jvm.hotspot.runtime.CompiledVFrame.getMonitors(CompiledVFrame.java:131)
>>          at
>> jdk.hotspot.agent/sun.jvm.hotspot.runtime.JavaVFrame.printLockInfo(JavaVFrame.java:125)
>>          at
>> jdk.hotspot.agent/sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:114)
>>          at
>> jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$26.doit(CommandProcessor.java:1073)
>>          at
>> jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:1964)
>>          at
>> jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:1934)
>>          at
>> jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1814)
>>          at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:99)
>>          at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:40)
>>          at
>> jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:191)
>>          at
>> jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:439)
>> ----------------
>>
>> It is caused by CompiledVFrame#getScope() returns null.
>> We should consider it at CompiledVFrame#getMonitors().
>>
>> I uploaded a webrev. Could you review it?
>> I checked this change with hotspot/jtreg/serviceability/sa on Linux x64.
>>
>>    http://cr.openjdk.java.net/~ysuenaga/JDK-8192897/webrev.00/
>>
>> We can reproduce this issue when we run the app with -Xcomp option.
>> So I changed ClhsdbJstack.java to run with it.
>
>
> How long does the test take to run with Xcomp? We have to watch execution
> times for the tests in each tier.
>
> Thanks,
> David
>
>
>>
>> I cannot access mach5 and JPRT. So I need sponsor.
>>
>>
>> Thanks,
>>
>> Yasumasa
>>
>