Process lose its parent then consume high CPU usage ...
Hello.
In an informix context, on AIX 5.3 TL 12, we encounter this problem :
Sometimes in the day (probably when users exits from their session), a child process lose its parent (PPID is now "1") and this child is consumming lot of CPU "USER".
I tried, on different cases, "truss -p <mypid>" : sometimes (for some processus) it says "truss: 0915-023 Cannot control process #950712", sometimes (for other processus) it waits and print nothing.
nobody has a magic crystall ball, but it seems that your user just pressed the close button of the window. because the terminal was lost, the system sent SIGHUP (hangup) signal to all applications, which were running in the session. your application can understand this signal and should be able to exit clean. Your stack shows, that it called standard C function exit(). After this call the process should die.
IS the stack dumpfrom the process running out of control? I do not think so - as agent_kgb said, the process should end on an exit() call. Process running amok just crank cpu until somebody kills it.
It definitely is a user training issue. Closing the desktop window will cause a SIGHUP to be sent to the UNIX processes. The process you are seeing is probably forked over to whatever the informix user has, not the original user account. Check the owning username to be sure. It affects where to look for code that is trapping the SIGHUP signal. Which your problem seems to be - a guess.
I agree with you, but I don't understand why the behavior changed.
We updated a 5.3 TL 9 AIX to 5.9 TL12 and we also move from a physical server to a VIO client. Before this migration, we didn't have the problem.
It happens with multiple users (more than 10 different users for the last period I checked) now in 5.3 TL12 but nothing similar happens with another server, with same application, in AIX 5.3TL9.
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Not a happy thought, but maybe it behaved well before because of a bug that got fixed with the update, or worse - a bug got introduced.
As to running on Power7 - in native mode, or in a vWPAR. In either case I suspect more than just the standard upgrade to AIX 5.3 TL12 (from memory SP7). In extended support there were several more updates (I have never seen).
Maybe among the "extended support" updates there is something extra you need.
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11-15-2016
