IJ54882: NATIVE MEMORY LEAK IN ZLIB WITH ZEDC

APAR status

• Closed as program error.

Error description

• Error Message: 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.
  
  z_zcalloc
  plat_deflate
  hw_deflate
  deflate
  .
  Stack Trace:
  .
  

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 Releases:
  .
  IBM Semeru Runtimes
   21 21.0.8.0
   17 17.0.16.0
   11 11.0.28.0
  .
  Downloads and supplementary documentation can be found at the
  following locations:
  - For non z/OS operating systems:
   - IBM Semeru Runtimes, Version 11 and later
   https://www.ibm.com/semeru-runtimes/downloads/
   - IBM SDK, Java Technology Edition, Version 8
   https://www.ibm.com/support/pages/java-sdk-downloads/
  - For the z/OS operating system:
   - Java SDK Products on z/OS
   https://www.ibm.com/support/pages/java-sdk-products-zos
  

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

  OPENJDK CLASS L

• Fixed component ID

  621800100

Applicable component levels