On 6 Jul 2003, Sean Bruno wrote:
> I have been troubleshooting an issue with a multi-threaded application
> port from Solaris X86 to Linux.
>
> It was randomly dumping core on "main" or other random parts of code.
>
> After hacking on the issue for about a week, I decided to write a little
> hello world program and compile it with the same options as my
> application. Lo-and-behold it cored in the same manner, randomly and
> confusingly.
>
> I then began to pare off flags and includes and libraries until, as if
> by magic, it began to work!
>
> It turned out that there is an existing issue all the way back to RH 7.2
> with the compile option "-fstack-check" Here is my sample prog:
>
> int main()
> {
> printf ("Hello World\n");
> return(0);
> }
>
>
> compile with: gcc -fstack-check -o test
>
> Run the output program up to 10 times. It should core dump at least
> once...Is this a bug in the kernel, compiler or standard libs?
I'm running Debian/Woody.
summer@xxxxxx:~/test$ gcc -fstack-check -o test fstack-check.c
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ ./test
Hello World
summer@xxxxxx:~/test$ gcc --version
2.95.4
summer@xxxxxx:~/test$
THis is okay too:
summer@xxxxxx:~/test$ gcc-3.0 --version
3.0.4
summer@xxxxxx:~/test$
My glibc:
summer@xxxxxx:~/test$ ldd --version
ldd (GNU libc) 2.2.5
Copyright (C) 2002 Free Software Foundation, Inc.
However, ...
[summer@xxxxxx test]$ gcc -fstack-check -o test fstack-check.c
[summer@xxxxxx test]$ ./test
Hello World
[summer@xxxxxx test]$ ./test
Hello World
[summer@xxxxxx test]$ ./test
Hello World
[summer@xxxxxx test]$ ./test
Hello World
[summer@xxxxxx test]$ ./test
Segmentation fault
[summer@xxxxxx test]$ ./test
Segmentation fault
[summer@xxxxxx test]$ ./test
Segmentation fault
[summer@xxxxxx test]$ ./test
Segmentation fault
[summer@xxxxxx test]$ ./test
Hello World
[summer@xxxxxx test]$ gcc --version
2.96
[summer@xxxxxx test]$ ldd --version
ldd (GNU libc) 2.2.5
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.
Written by Roland McGrath and Ulrich Drepper.
[summer@xxxxxx test]$
Magpie is running Clark Connect release 0.9.1 which is basically Red Hat
Linux release 7.3 (Valhalla)
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