gnat 4.1.0 stack overflow on Fedora Core 5

gnat 4.1.0 stack overflow on Fedora Core 5

[brian.b.mcguinness]

I made the mistake of upgrading from Fedora Core 4 to Fedora Core 5 and
now a number of programs are broken, including gnat:

# cat zz.adb
with Ada.Text_IO;
use  Ada.Text_IO;

procedure zz is
  N : Natural;
begin
  N := Natural'Last;

  Put_Line ("Natural ranges from 0 to " & Natural'Image (N));
end zz;

# gnatmake zz.adb
gcc -c zz.adb
+===========================GNAT BUG
DETECTED==============================+
| 4.1.0 20060304 (Red Hat 4.1.0-3) (i386-redhat-linux-gnu)
Storage_Error stack overflow (or erroneous memory access)|
| Error detected at a-tags.adb:448:7
   |
| Please submit a bug report; see http://gcc.gnu.org/bugs.html.
   |
| Use a subject line meaningful to you and us to track the bug.
   |
| Include the entire contents of this bug box in the report.
   |
| Include the exact gcc or gnatmake command that you entered.
   |
| Also include sources listed below in gnatchop format
   |
| (concatenated together with no headers between files).
   |
+==========================================================================+

Please include these source files with error report
Note that list may not be accurate in some cases,
so please double check that the problem can still
be reproduced with the set of files listed.

zz.adb

compilation abandoned
gnatmake: "zz.adb" compilation error

# uname -a
Linux localhost.localdomain 2.6.16-1.2096_FC5 #1 Wed Apr 19 05:14:36
EDT 2006 i686 i686 i386 GNU/Linux

Re: gnat 4.1.0 stack overflow on Fedora Core 5

[Jeffrey Creem]

brian.b.mcguinness@lmco.com wrote:
> I made the mistake of upgrading from Fedora Core 4 to Fedora Core 5 and
> now a number of programs are broken, including gnat:
> 
>

This is most likely due to the default state of the exec shield.

Check out this discussion (it has pointers into the GCC forums as well)

http://sourceforge.net/forum/forum.php?thread_id=1479304&forum_id=40858

Original submitter on that thread is still convinced there is a bug. I 
am not so sure I would call it a bug but I understand his basic premise.

Re: gnat 4.1.0 stack overflow on Fedora Core 5

[Björn Persson]

brian.b.mcguinness@lmco.com skrev:
> I made the mistake of upgrading from Fedora Core 4 to Fedora Core 5 and
> now a number of programs are broken, including gnat:

Updating Fedora 4 with the latest security fixes would also have broken 
Gnat. The immediate workaround is "echo 9 > 
/proc/sys/kernel/exec-shield". To make the workaround survive a reboot, 
put "kernel.exec-shield = 9" in /etc/sysctl.conf. See 
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=187853 for the details.

-- 
Bj�rn Persson                              PGP key A88682FD
                    omb jor ers @sv ge.
                    r o.b n.p son eri nu

Re: gnat 4.1.0 stack overflow on Fedora Core 5

[brian.b.mcguinness]

Ok, thanks to all for the help.

--- Brian