Intermittent "*** buffer overflow detected ***" errors with -D_FORTIFY_SOURCE=2 (?)

Hi perl5-porters,

I'm trying to work on an "interesting" problem.
It regards an XS module I wrote some time ago.
This module used to work perfectly under various Linux distributions,
including RHEL4, and Win32.

Now, with RHEL5, it's been reported to crash with "*** buffer overflow
detected ***" messages,
presumably when using `call_sv()' from XS code.

After digging a bit into the problem, it seems that the use of
-D_FORTIFY_SOURCE=2
in conjunction with and -O2 in $CFLAGS is causing these (fake?) buffer
overflows.

Actually the problems are intermittent: that is, if I run the test
suite of the module,
it fails maybe 40%-50% of the times. Horrible.

Reading briefly about _FORTIFY_SOURCE=2 from people having the same problem,
it would seem to me that it is just a really bad idea to have that enabled
for a perl (interpreter and modules) installation. Unfortunately, this
is the default in $CFLAGS for RHEL5.

So, coming to the question, has any of you dealt with this before?
Any advice?

-- 
Cosimo

• Intermittent "*** buffer overflow detected ***" errors with -D_FORTIFY_SOURCE=2 (?) by Cosimo Streppone
• Re: Intermittent "*** buffer overflow detected ***" errors with-D_FORTIFY_SOURCE=2 (?) by Tony Cook