IJ34295: NATIVE MEMORY LEAK IN ZLIB WITH ZEDC

APAR status

• Closed as program error.

Error description

• While using hardware compression with zEDC, the zlib code, which
  is shipped as part of lipzip.so, leaks native memory. With the
  HEAPCHK, the stack given below is reported to be the prime
  memory leak suspect.
  CELQVGHP
  dbgMalloc
  z_zcalloc
  plat_deflate
  

Local fix

• This native memory leak may be averted by turning off hardware
  compression, which can be done by setting this Unix environment
  variable: _HZC_COMPRESSION_METHOD=software.
  

Problem summary

• The problem was caused by a native memory leak in the zEDC
  hardware acceleration code. The effect of the memory leak was
  more pronounced on z15 compared to the earlier hardware.
  

Problem conclusion

• The zEDC hardware acceleration code included in the libzip.so
  has been updated to fix the native memory leak.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP36  (8.0.6.36)
     7.1  SR5       (7.1.5.0)
     7.0  SR11      (7.0.11.0)
  .
  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 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

• R800 PSY

     UP