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From "Ruslan Scherbakov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-2395) [drlvm][jvmti] GetObjectMonitorUsage does not return local references as expected by spec
Date Fri, 01 Dec 2006 14:18:24 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-2395?page=comments#action_12454913 ] 
            
Ruslan Scherbakov commented on HARMONY-2395:
--------------------------------------------

Initially teh problem was found in the TPTP thread profiler which uses GetObjectMonitorUsage
and DeleteLocalRef functions. The attached test case simulates its logic in the simplest manner.

>  [drlvm][jvmti] GetObjectMonitorUsage does not return local references as expected by
spec
> ------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-2395
>                 URL: http://issues.apache.org/jira/browse/HARMONY-2395
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Windows/ia32, Linux/ia32
>            Reporter: Ruslan Scherbakov
>         Attachments: JVMTI_MonTest.zip
>
>
> According to JVMTI spec GetObjectMonitorUsage function should return local references
in the monitor owner and in the wait and notify lists. Local refs returned by JVMTI or JNI
function can be deleted by DeleteLocalRef.
> However according to the test output below DRLVM does not return local ref. As a result
it crashes some time after DeleteLocalRef for the owner of the jvmtiMonitorUsage structure.
The same is for waiters/notify_waiters. SUN and JRockit work fine in this situation.
> DRLVM>>>
> =========================================================================================
> 2. run initial class WITH agent
> Agent_OnLoad: pVM=010020A0, options=(null)
> Agent_OnLoad: OK
>  1. MonitorWait            : thread=024D0B00, pJniEnv=01057288
>  2. MonitorContendedEnter  : thread=024D0B00, pJniEnv=01057288
> MonitorUsage: invalid phase
>  3. ThreadStart            : thread=024E3F50, pJniEnv=024E20B8
>  4. MonitorContendedEntered: thread=024D0B00, pJniEnv=01057288
>  5. MonitorWaited          : thread=024D0B00, pJniEnv=01057288
>  6. VMInit                 : thread=024D5730, pJniEnv=01057288
>  7. ThreadStart            : thread=024D0B00, pJniEnv=01057288
>  8. MonitorWait            : thread=024E3F50, pJniEnv=024E20B8
>  9. MonitorContendedEnter  : thread=024E3F50, pJniEnv=024E20B8
> MonitorUsage: entry_count=1, waiter_count=1
> MonitorUsage: DeleteLocalRef owner =024E3F50
> [ThreadTest] START
> 10. MonitorWait            : thread=024D0B00, pJniEnv=01057288
> 11. MonitorContendedEnter  : thread=024D0B00, pJniEnv=01057288
> ...
> An unhandled error (4) has occurred.
> ...
> SUN>>>
> =========================================================================================
> 2. run initial class WITH agent
> Agent_OnLoad: pVM=6D82F610, options=(null)
> Agent_OnLoad: OK
>  1. ThreadStart            : thread=00A87168, pJniEnv=00A865C8
>  2. MonitorWait            : thread=00A87A18, pJniEnv=00A865C8
>  3. ThreadStart            : thread=00A88788, pJniEnv=00A87BB0
>  4. MonitorWait            : thread=00A88828, pJniEnv=00A87BB0
>  5. VMInit                 : thread=00A84698, pJniEnv=00036F10
>  6. ThreadStart            : thread=00A92660, pJniEnv=00A90C80
>  7. ThreadStart            : thread=00A84698, pJniEnv=00036F10
> [ThreadTest] START
> [ThreadTest] buddy started
>  8. ThreadStart            : thread=00AA9168, pJniEnv=00A97938
>  9. MonitorContendedEnter  : thread=00AA9208, pJniEnv=00A97938
> MonitorUsage: entry_count=1, waiter_count=0
> MonitorUsage: DeleteLocalRef owner =00AA9210
> 10. MonitorWait            : thread=00A86138, pJniEnv=00036F10
> 11. MonitorContendedEntered: thread=00AA9208, pJniEnv=00A97938
> [ThreadTest] buddy run
> 12. ThreadEnd              : thread=00AA9168, pJniEnv=00A97938
> 13. MonitorWaited          : thread=00A86138, pJniEnv=00036F10
> [ThreadTest] FINISH
> 14. ThreadEnd              : thread=00A84698, pJniEnv=00036F10
> 15. ThreadStart            : thread=00A86420, pJniEnv=00036F10
> 16. ThreadEnd              : thread=00A86420, pJniEnv=00036F10
> 17. VMDeath                : thread=00000000, pJniEnv=00036F10
> JRockit>>
> =========================================================================================
> 2. run initial class WITH agent
> Agent_OnLoad: pVM=005ACF84, options=(null)
> Agent_OnLoad: OK
>  1. ThreadStart            : thread=00394FC8, pJniEnv=0039510C
>  2. ThreadStart            : thread=40B88090, pJniEnv=40B881D4
>  3. ThreadStart            : thread=40BCA738, pJniEnv=40BCA87C
>  4. ThreadStart            : thread=40BDCF08, pJniEnv=40BDD04C
>  5. ThreadStart            : thread=40BDD6C8, pJniEnv=40BDD80C
>  6. ThreadStart            : thread=40BFDBB0, pJniEnv=40BFDCF4
>  7. VMInit                 : thread=00394FC8, pJniEnv=0039510C
>  8. ThreadStart            : thread=411C39A8, pJniEnv=411C3AEC
>  9. ThreadStart            : thread=411C4258, pJniEnv=411C439C
> [ThreadTest] START
> [ThreadTest] buddy started
> 10. MonitorWait            : thread=00394FC8, pJniEnv=0039510C
> 11. ThreadStart            : thread=41213140, pJniEnv=41213284
> 12. MonitorContendedEnter  : thread=41213140, pJniEnv=41213284
> MonitorUsage: entry_count=1, waiter_count=0
> MonitorUsage: DeleteLocalRef owner =41213344
> 13. MonitorWaited          : thread=00394FC8, pJniEnv=0039510C
> 14. MonitorWait            : thread=00394FC8, pJniEnv=0039510C
> 15. MonitorContendedEntered: thread=41213140, pJniEnv=41213284
> [ThreadTest] buddy run
> 16. MonitorWaited          : thread=00394FC8, pJniEnv=0039510C
> 17. MonitorWait            : thread=00394FC8, pJniEnv=0039510C
> 18. MonitorContendedEnter  : thread=41213140, pJniEnv=41213284
> MonitorUsage: entry_count=0, waiter_count=1
> 19. MonitorContendedEntered: thread=41213140, pJniEnv=41213284
> 20. ThreadEnd              : thread=41213140, pJniEnv=41213284
> 21. MonitorWaited          : thread=00394FC8, pJniEnv=0039510C
> [ThreadTest] FINISH
> 22. ThreadEnd              : thread=00394FC8, pJniEnv=0039510C
> 23. ThreadStart            : thread=41215E98, pJniEnv=41215FDC
> 24. ThreadEnd              : thread=41215E98, pJniEnv=41215FDC
> 25. VMDeath                : thread=00000000, pJniEnv=41215FDC

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