IV26904: JVM CRASHES WHEN OPENING NON-PERSISTENT SHARED CLASS CACHE IN RE AD-ONLY MODE WITH A MEMORY CONTROL FILE OF 0 SIZE

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APAR status

  • Closed as program error.

Error description

  • Error Message: Segmentation error occurs when a user tries to
    use a non-persistent shared class cache in read-only mode with a
    memory control file of 0 size.
    .
    Stack Trace: j9shsem_deprecated_getid at
    sysvipc/j9shsem_deprecated.c:1173
    SH_OSCachesysv::initializeHeader at OSCachesysv.cpp:577
    SH_OSCachesysv::openCache at OSCachesysv.cpp:348
    SH_OSCachesysv::startup at OSCachesysv.cpp:224
    SH_CompositeCacheImpl::startup at CompositeCache.cpp:1151
    SH_CacheMap::startup at CacheMap.cpp:425
    j9shr_init at shrinit.cpp:2837
    J9VMDllMain at shrclssup.c:225
    runJ9VMDllMain at jvminit.c:2310
    pool_do at pool.c:636
    runInitializationStage at jvminit.c:2260
    protectedInitializeJavaVM at jvminit.c:5051
    j9sig_protect at jvminit.c:948
    JNI_CreateJavaVM at jniinv.c:101
    JNI_CreateJavaVM at jvm.c:2089
    JNI_CreateJavaVM () from
    /team/ashu/java7sr1/unzipped/jre/lib/amd64/j9vm/libjvm.so
    JavaMain () from
    /team/ashu/java7sr1/unzipped/jre/bin/../lib/amd64/jli/libjli.so
    .
    

Local fix

  • Remove the control files by using -Xshareclasses:destroy option
    and retry.
    

Problem summary

  • The problem occurs when the memory control file of a
    non-persistent shared class cache is of 0 size.
    Using such a cache in read-only mode specified by
    -Xsharedclasses:readonly option results in JVM to crash.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 SR3
    7.0.0 SR2
    .
    JVM has been fixed to display a proper error message when it
    tries to attach to a non-persistent shared class cache with
    memory control file of size 0 bytes in read-only mode.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV26904

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-08-23

  • Closed date

    2012-08-23

  • Last modified date

    2012-08-23

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    J9 COMMON CODE

  • Fixed component ID

    620700127

Applicable component levels

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Virtual Machine

Software version:

260

Reference #:

IV26904

Modified date:

2012-08-23

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