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Can you please check value of $TMPDIR and $APPLTMP? These should point to valid directory.
Meanwhile also check below MOS notes:-
FRM-41839: Disk I/O error on Temporary Record Buffer File /var/tmp/AAAJGaa9Z.TMP [ID 181371.1]
FRM-41839 Disk I/O Error While Exporting From Forms [ID 784036.1]
Change The Location Of TMPDIR When You Get Error "FRM-41839: [ID 760462.1]
Pelase make search as FRM-41839: /tmp in metalink, there are 17 similar issue avaliable
Please also see old threads which discuss the same topic -- http://forums.oracle.com/forums/search.jspa?threadID=&q=FRM-41839&objID=c3&dateRange=all&userID=&numResults=15&rankBy=10001