IJ41626: ABEND U4083 IN LIBZIP.SO INVOKED BY JAVA/UTIL/ZIP/CRC32.UPDATEBYTES() ON Z/OS 31-BIT

APAR status

• Closed as program error.

Error description

• Error Message: An intermittent segmentation fault may occur
  within the libzip.so library when trying to compute CRC-32
  checksum. Language Environment will subsequently throw an ABEND
  U4083 with reason code 15 (X'0F').
  .
  Stack Trace: The segmentation fault will occur at +282 offset of
  the LEVGFM16 function in libzip.so. The failing instruction is:
  VLM %v5, %v8, 0(%r3).
  The Java stack at the point of failure will show:
  java/util/zip/CRC32.updateBytes(int, byte<OSB><CSB>, int, int)
  (Native Method)
  java/util/zip/CRC32.update(byte<OSB><CSB>, int, int) source:
  CRC32.java:87
  .
  

Local fix

Problem summary

• The LEVGFM16 function in libzip.so, used to compute CRC-32
  checksum, incorrectly used 64-bit instructions to operate on
  32-bit buffer lengths and pointers.
  

Problem conclusion

• The implementation for CRC-32 has been updated to prevent the
  crash from occurring.
  .
  This APAR will be fixed in the following Releases:
  .
  IBM SDK, Java Technology Edition
   8 SR7 FP15 (8.0.7.15)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  maintenance can be found at:
   https://www.ibm.com/support/pages/java-sdk
  

Temporary fix

Comments

APAR Information

• 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

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels