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“Signal 11” : Not So Scary Anymore..

Signal 11’ is one of the most scary things in EBS developer/Apps DBA community . If you haven't encounter yet , after working couple of years in EBS, that means you are quite lucky ..kidding

If you came from basic C programing skill, then you might be linking with malloc ..memory allocation , believe me, that is totally different.

In this post I will share some of the information which you need to know, rather than a creating a panic situation with developer or DBA .


In layman term, Signal 11 is an obscure way to say that there is hardware problem with the system's memory

"Unaligned memory access" is a message coming back from the UNIX operating system letting you know that an Oracle executable has tried to access memory incorrectly. It's not a problem with UNIX but is part of the operating system's mechanism of protecting itself from crashing.

Chances are there you might get either of these ..Autoinvoice ,GLPPOS, GLLEZL, GLBMBO, APXXTR, GLNSVI, INCTGL , GLAMAS, ARZCAR, ARGLTP, RGRARG, GLCRVL,GLPAUTOP ,FADEPR - Depreciation, PDF Reports, XML OUTPUT



You usually find, windows equivalent of a Signal 11 error is when a process terminates with ‘Error -1073741819’


  1. First thing to look at is the last few lines of logfile – preferably with Debug on
  2. Searching that you might find in log file, chances are high you will get some node at metalink. if not
  3. Check with your apps DBA , pass the information , he will try to Analyze/diagnosis and advice.
    • what he will do, he will try to locate core file which got is written to the directory from which the executable was called.
    • Take a note,after a Signal 11 error has occurred, the program may write a dump of itself to $<product>_TOP/bin
    • The ‘core’ file which got located is just a dump of the memory occupied by the program at the time of failure, and as such is not easy to read.
    • they need some utilities to produce a readable output. DBA typically used these utilities adb, dbx, xdb, gdb,
  4. If nothing get solved Quickly, raise a SR with Oracle.

Meantime , you can also check the list of unix signals with their explanation in note id 1038055.6

1 Comment (Open | Close)

1 Comment To "“Signal 11” : Not So Scary Anymore.."

#1 Comment By Mike On March 12, 2012 @ 6:29 am

Thanks Sanjit, this is best ever i read on this topic.

Keep it good work.