Bug 102408

Summary:	Mesa not compiled with "__GLX_ALIGN64"
Product:	Red Hat Enterprise Linux 2.1	Reporter:	Brett Johnson <brett.johnson>
Component:	mesa	Assignee:	X/OpenGL Maintenance List <xgl-maint>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Jay Turner <jturner>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	2.1	CC:	srevivo
Target Milestone:	---
Target Release:	---
Hardware:	ia64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-05-10 23:05:03 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Brett Johnson 2003-08-14 20:55:51 UTC

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:

Comment 6 Mike A. Harris 2005-05-10 23:05:03 UTC

Mesa is compiled with this option by default in RHEL 3 and RHEL 4.

Setting status to "CURRENTRELEASE".