#328 Using SCL SUBROUTINEs causes memory corruption

[Danny Faught]

Subroutine calls that pass parameters cause a memory leak in TExecuter_htp.exe and the Script Modeler. This is severe enough in some cases that we have to manually set variables instead of using parameters in a subroutine call to pass data into a subroutine.

I'm running OpenSTA 1.4.3.20 on Windows XP Pro SP2. Sample code that quickly demonstrates the leak when running under a single VU is below.

---------------------
!Browser:IE6
!Date : 4/20/2006
Environment
Description ""
Mode HTTP
Wait UNIT MILLISECONDS

Definitions
integer loop
character*8192 foo

Code
do loop = 1, 2, 0
do loop = 1, 1000
call makeleak ["aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"]
enddo
wait 1
enddo

subroutine makeleak [foo]
end subroutine
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Warning: the Script Modeler tends to become unresponsive when running this script.

[Daniel Sutcliffe]

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A reasonable amount of evidence has been collected that suggests that using any SUBROUTINE calls causes memory corruption - and this memory corruption can lead to memory leaks and/or tests failing/crashing. Using parameters in SUBROUTINE calls seems to guarantee memory leaks but this is only part of this much bigger problem.