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
