LIBGL_ALWAYS_INDIRECT causes firefox crashes

In another occurance of the problem, the client had:

# lspci -nn -k |grep -A 2 VGA
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation NV5M64 [RIVA TNT2 Model 64/Model 64 Pro] [10de:002d] (rev 15)
Kernel driver in use: nouveau
Kernel modules: nouveau, nvidiafb, rivafb

...while the server did not have nvidia in that case:
# lspci -nn -k | grep -A 2 VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e22] (rev 03)
 Subsystem: Hewlett-Packard Company Device [103c:2a94]
 Kernel driver in use: i915

Third case:

# lspci -nn -k | grep -A 2 VGA
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation NV5M64 [RIVA TNT2 Model 64/Model 64 Pro] [10de:002d] (rev 15)
        Kernel driver in use: nouveau
        Kernel modules: nouveau, nvidiafb, rivafb

We should probably start by disabling LIBGL_ALWAYS_INDIRECT for all nvidia cards, and then try to hunt down the actual bug.

Attaching Xorg.log where the segfault in nouveau_vieux_dri.so can be seen.

An easy way to reproduce the problem without LTSP:
(from a client with an nvidia card):
$ ssh -X server
$ LIBGL_ALWAYS_INDIRECT=true firefox

One workaround mentioned in #nouveau:
(08:34:05 πμ) airlied: got all the accel you are going to get you might just mv the nouveau_vieux_dri.so aside

Tested it and it works fine, maybe we can do that on in /usr/share/ldm/rc.d/X51-opengl (inside the "if" so that it affects thin clients only).

In this case, although with Precise not updated for a couple of months, the problem did NOT happen:

# lspci -nn -k | grep -A 2 VGA
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation NV11 [GeForce2 MX/MX 400] [10de:0110] (rev b2)
        Kernel driver in use: nouveau
        Kernel modules: nouveau, nvidiafb, rivafb

Some people are reporting that this doesn't happen in a fresh 12.04.1 installation, but it happens after they `apt-get update` their server.

Another teacher reports the same problem in these clients:

root@ltsp135:~# lspci -nn -k | grep -A 2 VGA
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation NV18
[GeForce4 MX 4000] [10de:0185] (rev c1)
   Subsystem: Micro-Star International Co., Ltd. Device [1462:9363]
   Kernel driver in use: nouveau

Status changed to 'Confirmed' because the bug affects multiple users.

I having this same problem in all my ltsp clients that have nvidia video card.
I'm using Ubuntu 12.04.1 64 bits.
Is there any workarround?

On Fri, Nov 30, 2012 at 09:25:38PM -0000, Christian wrote:
> I having this same problem in all my ltsp clients that have nvidia video card.
> I'm using Ubuntu 12.04.1 64 bits.
> Is there any workarround?

You can create an empty file to override it:

  sudo mkdir -p /opt/ltsp/i386/etc/ldm/rc.d/
  sudo touch /opt/ltsp/i386/etc/ldm/rc.d/X51-opengl
  sudo ltsp-update-image

Adjust i386 for amd64 if you're using amd64 clients.

Note that if it is ever fixed properly, you'll want to remove this empty file.

live well,
  vagrant

Fix committed in http://bazaar.launchpad.net/~ltsp-upstream/ltsp/ldm-trunk/revision/1453.
It is just a temporary workaround, it should be removed in the future once the nouveau bug is resolved.

It'd be nice if someone could SRU this, as many LTSP users are affected.

The committed fix is applied too late, after xorg is loaded. So it's not working on the first login, but only on subsequent logins.
The `rm -f /usr/lib/i386-linux-gnu/dri/nouveau_vieux_dri.so` command should be run from some init-ltsp.d script instead.

A workaround that doesn't involve updating the chroot is to put this in lts.conf:
[Default]
RCFILE_01="rm -f /usr/lib/i386-linux-gnu/dri/nouveau_vieux_dri.so"

Fix committed in http://bazaar.launchpad.net/~ltsp-upstream/ltsp/ltsp-trunk/revision/2447.

Fix released in LTSP 5.4.5.