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From "Geir Magnusson Jr (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HARMONY-643) [drlvm] JVMTI GetAllStackTraces and GetThreadListStackTraces corrupt memory in stack info buffer
Date Mon, 07 Aug 2006 12:48:15 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-643?page=all ]

Geir Magnusson Jr reassigned HARMONY-643:
-----------------------------------------

    Assignee: Geir Magnusson Jr

> [drlvm] JVMTI GetAllStackTraces and GetThreadListStackTraces corrupt memory in stack
info buffer
> ------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-643
>                 URL: http://issues.apache.org/jira/browse/HARMONY-643
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Gregory Shimansky
>         Assigned To: Geir Magnusson Jr
>            Priority: Minor
>         Attachments: get_all_stack_traces_test.tar.bz2, jvmti_stack_traces.path
>
>
> I've found a bug that GetAllStackTraces and GetThreadListStackTraces functions allocate
jvmtiFrameInfo buffers inside of stack info buffer in the way that filling in stack traces
in these buffers overwrite the contents of jvmtiStackInfo structured.
> Filling in stack trace for the 1st thread corrupts info about 2nd. Then when the function
tries to suspend 2nd thread it cannot beacuse pointer to thread object is invalid. So function
which fills in stack trace for a single thread (GetStackTrace) returns an error code which
is ignored. Stack traces therefore is not correct.
> Test checks that thread objects returned by GetAllStackTraces are valid (GetThreadInfo
can be performed on them). To build the test java 1.5 SDK is required. Compile all 3 source
files and create GAST.dll (libGAST.so on Linux, to compile on Linux also specify -DLINUX for
compilation) and compile java source (with target 1.4). To run the test use the following
command line: <path to drl vm>/bin/ij -agentlib:GAST GAST

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