🚀 go-pugleaf

In article <1992Aug18.143135.6259@cc.tut.fi>, mn87504@cs.tut.fi (Naatula Mika) writes:
|> 
|> I wonder if this is a familiar bug to someone.
|> 
|> The problem is:
|> Sometimes my program causes a segmentation fault. If I drive it with
|> CVP I can find out (from calls sequence) that the error was caused by
|> malloc. To be exact, malloc calls an internal(?) function named
|> _searchseg() that fails. Any ideas what this function might be?
|> 
|> I use MSC 6.00 in OS/2 1.3 environment.
|> 
|> I write programs for Lotus Notes using Lotus Notes API libraries. (But
|> I think it is irrelevant to the promlem). 
|> The memory model used is Large.
Possibility - Bug is yours (very small I'm sure, but still possible)

Can you compile and link with a debugging version of malloc?
	(Some environments provide for one).

You might want to count number of mallocs/frees and trap on a free when
number malloced < number freed.

Verify that no access is made beyond the end of malloced structures.  Typically
malloc creates a linked list looking like the following:

	--------------------------------------------
	| malloc info a | user data | malloc info b|
	--------------------------------------------

The malloc info contains ptrs to other blocks in free/use chain, size information,
etc...  Please note that malloc info may be found at one end or the other of
the structure, and writing beyond the end of structure would trash it and corrupt
the heap.

Possibility Bug is in Notes Library (less likely, but also possible)_

Can you stub out calls.

Possibility Bug is in MSC 6.00 (less likely)

Try compiling and linking with competitor's compiler/older version

Possibility Hardware / OS bug

Try a different machine

|> 
|> My program uses a lot of dynamic memory allocation, but I am quite
|> sure that there is no bugs in my code. I have spent two days checking
|> out the memory allocation of this program.
|> 
|> -- 
|>              __   | Mika Naatula            Email: mic@cc.tut.fi
|> |\ //| ||  //  \  | Lindfrosinkatu 8 A 11          mn87504@cs.tut.fi
|> | \/ | || ||      | 33720 Tampere, FINLAND
|> |    | ||  \\__/  | 931-185 993

-- 
|
|	maniattb@cs.rpi.edu - in real life Bill Maniatty
|