IV19461: MEMORY CORRUPTION WHEN USING IBM HEALTH CENTER

APAR status

• Closed as program error.

Error description

• Error Message: A SIGSEGV/GPF is received when IBM Health Center
  is connected to the JVM and requests a JLM monitor dump.
  .
  Stack Trace: (0x00002B5651230327 <OSB>libc.so.6+0x75327<CSB>)
  (0x00002B5651232A1E <OSB>libc.so.6+0x77a1e<CSB>)
  __libc_malloc+0x77 (0x00002B56512350D7
  <OSB>libc.so.6+0x7a0d7<CSB>)
  (0x00002B565206BAB9 <OSB>libj9prt26.so+0xfab9<CSB>)
  (0x00002B5653EC8EB8 <OSB>libj9jvmti26.so+0x1feb8<CSB>)
  hc_alloc+0x40 (0x00002B59053E20BF
  <OSB>libhealthcenter.so+0x90bf<CSB>)
  monitor_dump_event+0x244 (0x00002B59053DE075
  <OSB>libhealthcenter.so+0x5075<CSB>)
  Java_com_ibm_java_diagnostics_healthcenter_agent_dataproviders_J
  LADataProvider_reportJLA+0x40 (0x00002B59053DDDDE
  <OSB>libhealthcenter.so+0x4dde<CSB>)
  (0x00002B5651CE6C80 <OSB>libj9vm26.so+0x32c80<CSB>)
  .
  

Local fix

Problem summary

• The problem is caused by creation of a new monitor by the JVM
  while a JLM monitor dump is being performed.
  

Problem conclusion

• This defect will be fixed in:
  7.0.0 SR1
  6.0.1 SR2
  .
  The JVM has been updated to prevent the memory corruption and
  crash from occurring when performing a JLM monitor dump.
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R260 PSY

     UP