Bug 575458

Summary:	media-libs/mesa: segfaults on ABI=x32 when built with USE=nptl
Product:	Gentoo Linux	Reporter:	Dainius Masiliūnas <pastas4>
Component:	Current packages	Assignee:	Gentoo X packagers <x11>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
See Also:	https://bugs.freedesktop.org/show_bug.cgi?id=94512
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	393673

Description Dainius Masiliūnas 2016-02-23 12:15:55 UTC

It looks like the assembly used by Mesa is not x32 compatible yet, and the Mesa build system does not detect that x32 needs assembly disabled either. So without an explicit "--disable-asm", any calls to /usr/libx32/libGL.so.1 result in a segfault in whatever is the first function being accessed. This means that even things like glxinfo and glxgears segfault every time, and also X segfaults when GLAMOR is used.

At the moment all mesa ebuilds only use the "--disable-asm" configure flag when on x86 and with +pic. However, it should also be used for x32 unconditionally.

Comment 1 Dainius Masiliūnas 2016-07-27 20:10:47 UTC

Looks like there's an upstream bug about this, and it might suffice to mask the nptl USE flag on x32. I'll see if I can test this.

Comment 2 Dainius Masiliūnas 2016-07-29 14:28:56 UTC

I just tested, and confirmed that indeed it is sufficient to disable the nptl USE flag for Mesa to work properly in x32, as per the upstream bug. One does not need to disable assembly altogether.

Can the nptl USE flag be hardmasked in x32 for the time being, then?

Comment 3 Matt Turner gentoo-dev

2017-01-13 00:39:03 UTC

Fixed upstream by

commit 89458366585c34879b70110758bb4fd3acb62ce0
Author: Grazvydas Ignotas <notasas@gmail.com>
Date:   Sun Jan 8 19:38:09 2017 +0200

    mapi: update the asm code to support x32

should be in the 17.0 release and perhaps backported to 13.0.x.

Comment 4 Matt Turner gentoo-dev

2017-01-29 06:54:22 UTC

Fixed in the 17 series, and will be in 13.0.4.