System Hangs or Errors Seen in Event Viewer or /var/log/messages for FRMWEB When Forms Session Closed Using Browser

Applicable to :

Oracle Forms - Version: 10.1.2.0.2 and later   [Release: Oracle10g and later ]
Linux x86-64

Warning or Error Message :

In /var/log/messages :
kernel: frmweb[16576]: segfault at 000000006974655e rip 00000000081d3ca9 rsp 00000000ffff9d2c error 4
(most numbers are not significant, they will likely differ on your system)
On Unix, huge core files can also be generated, possibly causing a system hang or various problems.

Reason for occurance : 

The users are closing the Forms sessions using the browser and not by using the exit mechanisms in the Forms.

Answer :
To prevent these error messages, close the Forms application normally before closing the browser.

The correct procedure to

--  Close a form   --   F4

-- Query a form  --  F11

--  Find the query  -- Ctrl + F11

If using Internet Explorer, you can pop-up a message window when users attempt to close the browser by following indications from NOTE 605327.1 - How To Trap Attempts At Closing The Parent Browser Running A Forms Application given in the oracle metalink

On Unix, setting "ulimit -c" to "0", for example before launching the "opmn" processes, will prevent writing of further "core" files. This can avoid completely the risk of a huge frmweb "core" file possibly impacting the system in case a user would close his browser without exiting Forms first:

ulimit -c 0
opmnctl startall