Description of problem:

Writing tests with Test::Simple, for a module using ClearCase::CtCmd, I
get an error at exit in perl 5.8.5 on RedHat Linux.
The error doesn't show up in a 5.8.5 version of perl built from the 
sources.
Here is a small transcript reproducing the problem (script attached):

tmp> ./testpl2
1..1
ok 1 - Testing is fun
*** glibc detected *** free(): invalid pointer: 0x00e01900 ***
Aborted
tmp> ./testpl1
1..1
ok 1 - Testing is fun
tmp> diff testpl1 testpl2
1c1
< #!/tmp/local/bin/perl -w
---
> #!/usr/bin/perl -w
tmp> rpm -qf /usr/bin/perl
perl-5.8.5-36.el4_5.2
tmp> /tmp/local/bin/perl -v | head -2

This is perl, v5.8.5 built for i686-linux
tmp> uname -a
Linux engbuildpc 2.6.9-67.ELsmp #1 SMP Wed Nov 7 13:58:04 EST 2007 i686 i686
i386 GNU/Linux
tmp> cat /etc/redhat-release 
Red Hat Enterprise Linux WS release 4 (Nahant Update 6)


Version-Release number of selected component (if applicable):
perl-5.8.5-36.el4_5.2

How reproducible:
Fully, only requires ClearCase and ClearCase::CtCmd (probably not specific)

Steps to Reproduce:
1. Install ClearCase
2. Install ClearCase::CtCmd
3. Run script 
  
Actual results:
Error in the end of execution:

*** glibc detected *** free(): invalid pointer: 0x00e01900 ***
Aborted


Expected results:


Additional info: