Description of problem:

A simple OpenGL program (attached) will generate an unaligned access (even
though RedHat's kernel won't display it anywhere by default ;o).  This has a
pretty large effect on performance, and/or will cause a core dump if the program
is run with "prctl --unaligned=signal".  This appears to be fixed in Mesa, if
it's compiled with the "-D__GLX_ALIGN64" option.

Version-Release number of selected component (if applicable):

Mesa-3.4.2-10

How reproducible:

Always


Steps to Reproduce:

1. Save the following program as "test.c"

--snip--
void display( void ) {glScaled( 1.0, 1.0, 1.0 );}
main( int argc, char *argv[] ) {
    glutInit( &argc, argv );
    glutCreateWindow( "test" );
    glutDisplayFunc( display );
    glutMainLoop();
}
--snip--

2. Compile test.c...

$ gcc -lglut -lGLU -lGL -lm -o test test.c

3. Run the program with prctl...

$ prctl --unaligned=signal ./test
    
Actual results:

Core dump.

Expected results:

No core dump.

Additional info: