Re: Heap of something...

On 19/02/2008, at 7:07 AM, rob@xxxxxxxxx wrote:

Basically I was told not to worry about it. Then again, this is what the
person I talked to heard from the team that supports this out of
Guadalahara.
Is this like normal? Would this error be comparable to someone doing a
DLTF QTEMP/MYFILE (to make sure it's not there before creating it) and a
generic monmsg with no removal of the message from the job message queue?
Or is this really bad form?

I think it's bad form but then I think leaving unnecessary messages in the job log is also bad form.

MCH6902 says the error type is 2 which means the code tried to free or realloc heap space that isn't allocated. This can be caused by freeing an already freed pointer or reallocing a freed pointer or freeing or reallocing using a pointer from malloc/calloc that has been messed with.

As far as I know the purpose of this message is to help developers find code defects related to dynamic storage management--hence the run-time converts the MCH6902 *ESCAPE into a C2M1212 *DIAG message.

If the message is a result of freeing an already freed pointer then it will not cause a problem for the code and can be ignored (but one hopes the developer will fix the root cause in a future release). If it is caused by a failed realloc, or by a free or realloc on a 'bad' pointer, then that will likely manifest as 'peculiar' behaviour.

I think some investigation as to the cause of the problem should be performed before saying "don't
worry about it". Perhaps they've done that and know it's OK hence the response?

Regards,
Simon Coulter.
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