IBM Support

IJ04875: JAVA JIT: CRASH IN JIT LIBRARY FUNCTION FINDCLASSINFO()

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APAR status

  • Closed as program error.

Error description

  • Error Message: A SIGSEGV is received while executing
    findClassInfo() when the JIT is compiling a method.
    .
    Stack Trace:
    TR_PersistentCHTable::findClassInfo(TR_OpaqueClassBlock*)()
    TR_PersistentInfo::isObsoleteClass(void*,TR_FrontEnd*)()
    TR_PPCPrivateLinkage::buildVirtualDispatch(...)()
    ...
    .
    The issue is only known to occur on PowerPC machines. The issue
    is unlikely to occur on architectures that have strong memory
    coherency (like X86 or ZSeries).
    

Local fix

  • Depending on the release of Java, one of the following java
    command line options can be used to avoid the problem:
    Java 6/7.0: -Xjit:disableCHTable,disableCHOpts
    Java 7.1/8: -Xjit:disableCHOpts
    The use of the above options will have some effect on the
    execution performance of JIT compiled code.
    

Problem summary

  • The JIT compiler failed to use locking to prevent a compiler
    thread from reading from an internal data structure at the same
    time that another compiler thread is adding to the structure
    which can lead to a crash in findClassInfo() on architectures
    that have weak memory coherency.
    

Problem conclusion

  • The JIT was modified so that proper locking is used to prevent
    concurrent access to a JIT internal data structure.
    .
    This APAR will be fixed in the following Java Releases:
       7    SR10 FP25 (7.0.10.25)
       7 R1 SR4 FP25  (7.1.4.25)
       6 R1 SR8 FP65  (6.1.8.65)
       8    SR5 FP11  (8.0.5.11)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the available
    Service Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IJ04875

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-03-12

  • Closed date

    2018-04-03

  • Last modified date

    2018-04-03

  • 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

    JIT

  • Fixed component ID

    620700124

Applicable component levels

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"260","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
03 April 2018