[WEB400] Re: HTTP Jobs hanging up

["Andrew Borts" <Andrewb@xxxxxxxxxxxxxxxxxxx>]

Sorry - having never written a program with a bug, it was hard for me to 
understand that it was a program problem, and not operating system related.... 
:) 

Andrew Borts / Webmaster
Seta Corporation
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E-mail: Andrewb@xxxxxxxxxxxxxxxxxxx 
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 -----Original Message-----
From:   jrc@xxxxxxxxxx [mailto:jrc@xxxxxxxxxx] 
Sent:   Monday, March 24, 2003 2:19 PM
To:     web400@xxxxxxxxxxxx
Subject:        [WEB400] Re: HTTP Jobs hanging up

Thanks to everyone who has responded to this: with Scott's help I was able to 
break into the running job in debug and find where the endless loop is 
occuring, but it makes no sense to me.

Here is the loop:

dow MLNAM = NAMEIN; 
  if MMAP = LASTMAP;
    read cafpmast;  
    leave;          
  endif;            
  read cafpmast;    
enddo;              

MLNAM is the field from the file and there is only one record in the file with 
this name.  In debug I can see the read statement processing, but it never 
moves to the next record, so the field value cannot change.

After EVERY read I get the same MLNAM and MMAP (both fields from cafpmast), so 
I never get out of the loop.  How can this be???  

Thanks,

Joel

>jrc@xxxxxxxxxx wrote:
>> I'm experiencing a frustrating problem on our
>web server (running Apache on V5R1). 
>> 
>> Recently, the server started hanging jobs for no
>apparent reason.  By hanging jobs, I mean that I
>get several HTTP jobs that never stop running and
>devouring CPU -like a program stuck in an endless
>loop.
>> 
>> I can end the jobs to recover.  Sometimes I
>won't see it for days and sometimes it will happen
>five or six times a day.  I can work with the job
>before I end it and I have retrieved the program
>and statement number (this appears to be the only
>consistency), but according to the compile listing
>the statement is an ENDSR and I don't see how a
>program could get endlessly stuck on an ENDSR.
>> 
>> Most frustrating of all is that I cannot
>reproduce the problem and I cannot seem to isolate
>a set of like circumstances.  Is their a way I can
>get a program dump from a program that is running?
>> 
>> Thanks,
>> 
>> Joel
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>
>
>
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