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WAS3.5 AIX Segmentation Fault Problem

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We are performing stress test using loadrunner for our application based on WAS2.5 on AIX4.3.3 (ML10) and db2. The application runs fine for few hours and after that WebSphere stops responding and the java process for websphere uses >100% of the CPU time. If we keep it running after 30 or so minutes following error is shown in the standard error stderr.log
SIGSEGV 11 (*) segmentation violation
si_signo [11]: SIGSEGV: (*) segmentation violation
si_errno [0]: Error 0
si_code [50]: Error 0 [addr: 0x4D0045]
And the WebSphere comes back but without any session object. I monitored the GC statistics it is 23% free of 2GB of the total heap size (We have 8GB of physical RAM on machine).
I am not sure if there is any known issue with IBM JRE1.2.2 or is it my application problem.
Any help will be appericiated.
Ali Khan
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