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Status Not under consideration
Workspace Db2
Created by Guest
Created on Feb 25, 2015

better logging for stack overflow, ulimit stack to small

With this PMR we were searching quite hard for the reason, why a 3rd-party-software was dying with segmentation fault in dynamic linked shared library libdb1.so

We could only see:
Feb 18 09:01:56 smtcb00254 kernel: [1270273.292859] os4x_licinfo[36589]: segfault at 7fffff7fe728 ip 00007ffff509d258 sp 00007fffff7fe730 error 6 in libdb2.so.1[7ffff4aef000+23ce000]
And:
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
==10541== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==10541== Access not within mapped region at address 0x7FE800808

But nothing, except the IBM Support with this PMR, was giving a hint, that the stacksize was a problem.
Solution was at the end to increase default kernel stack size from 8MB to a bigger value. (ulimit -s)

Further information should be available in the PMR.

Request:
please increase and optimze logging in this failure-situation and catch this failure, eg. like this:
printk(KERN_ALERT "stack size $stack too small, increase with ulimit –s ... . EXIT\n");