PI20036;8.5.5: stack overflow in processcpu module

Download Description

PI20036 resolves the following problem:

ERROR DESCRIPTION:
A stackOverflow problem implicating ProcessCPU64.dll is due to the CreateToolhelp32Snapshot function in Microsoft Windows' Kernel32.dll library returning a process tree which has a
parent/child cycle (i.e. child is the parent of himself). This causes ProcessCPU to go into infinite recursion as it attempts to do a depth-first traversal of the process tree.

LOCAL FIX:
n/a

PROBLEM SUMMARY

USERS AFFECTED:
All users of IBM WebSphere Application Server

PROBLEM DESCRIPTION:
stackOverflow in ProcessCPU module

RECOMMENDATION:
None

WebSphere Application Server native code ProcessCPU64.dll experiences native stackoverflow and crash while collecting CPU stats. The stackOverflow problem implicating ProcessCPU64.dll is due to the CreateToolhelp32Snapshot function in Microsoft Windows'Kernel32.dll library returning a
process tree which has a parent/child cycle. This causes ProcessCPU to go into infinite recursion as it attempts to do a depth-first traversal of the process tree.

PROBLEM CONCLUSION:
The code is fixed to find the parent Process ID in the list of child process IDs returned in process structure and skipped to avoid the infinite recursion.

The fix for this APAR is currently targeted for inclusion in fix pack 8.5.5.3 Please refer to the Recommended Updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980