Nouveau - Feb 2013 - [Bug 61321] New: [regression][NV4c] System hang while loading gdm on 3.7 kernel (works on 3.6)

https://bugs.freedesktop.org/show_bug.cgi?id=61321

          Priority: medium
            Bug ID: 61321
          Keywords: regression
          Assignee: nouveau at lists.freedesktop.org
           Summary: [regression][NV4c] System hang while loading gdm on
                    3.7 kernel (works on 3.6)
        QA Contact: xorg-team at lists.x.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: cesarb at cesarb.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Since upgrading from a 3.6.10 kernel to a 3.7.9 kernel (Fedora 18), the system
started hanging while loading gdm. Going back to the 3.6 kernel works, going to
a 3.8 kernel hangs the same way.

The hang manifests first as the gdm spinning "loading" cursor
stopping,
followed a few seconds later by a screen full of a repeated noise pattern
(different for each boot, but looks like a small block of noise tiled all over
the screen). The machine does not answer to the keyboard (num lock/caps lock
LEDs) or the network (by this point NetworkManager already started the
interface, so I can get a few pings before it hangs).

In particular, it is not the initial modeset when loading the module which
hangs; it is only gdm. If I boot with systemd.unit=multi-user.target, I can
boot without any hangs, load netconsole, and isolate graphical.target to load
gdm to see it hang. I used that to capture the kernel messages until the hang
for the Fedora 3.7.9 kernel.

I also managed to capture the Xorg.0.log for the attempt with the 3.8 kernel
(booting directly into graphical.target).

The relevant version numbers are:

kernel-3.6.10-4.fc18.x86_64 (works)
kernel-3.7.9-201.fc18.x86_64 (hangs)
Upstream 3.8 kernel with a Fedora config (hangs)
xorg-x11-server-Xorg-1.13.2-2.fc18.x86_64
xorg-x11-drv-nouveau-1.0.6-1.fc18.x86_64
libdrm-2.4.42-1.fc18.x86_64
mesa-dri-drivers-9.0.1-4.fc18.x86_64

I also attempted once booting 3.7.9 with nouveau.config=NvPCIE=0 as suggested
at bug #58776; it did not make any visible difference.

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--- Comment #1 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
Created attachment 75390
  --> https://bugs.freedesktop.org/attachment.cgi?id=75390&action=edit
First part of attempt with 3.7.9

First part of attempt with the 3.7.9 kernel, captured with dmesg after booting
into multi-user.target

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--- Comment #2 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
Created attachment 75391
  --> https://bugs.freedesktop.org/attachment.cgi?id=75391&action=edit
Second part of attempt with 3.7.9

Second part of attempt with the 3.7.9 kernel, captured with netconsole before
and during systemd isolate of graphical.target

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--- Comment #3 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
Created attachment 75392
  --> https://bugs.freedesktop.org/attachment.cgi?id=75392&action=edit
lspci -v

lspci -v (with 3.6 kernel)

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--- Comment #4 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
Created attachment 75393
  --> https://bugs.freedesktop.org/attachment.cgi?id=75393&action=edit
Xorg.0.log.old from attempt at kernel 3.8, copied after boot to working kernel

This was from when I attempted booting into the 3.8 kernel. Notice the block of
NUL bytes at end of the file, suggesting it might have been truncated.

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--- Comment #5 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
If there is anything else I could add to the kernel command line to get better
logs, just ask and I will try again. I could not easily find on the wiki an
authoritative list of debugging parameters, so I might not have made it print
enough debugging noise.

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--- Comment #6 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
I just did a bisect.

The symptoms change mid bisect (losing video at the initial modeset, instead of
hanging completely at gdm), so I am not completely sure, but here are the
results:

70ee6f1cd6911098ddd4c11ee21b69dbe51fb3f9 is the first bad commit
commit 70ee6f1cd6911098ddd4c11ee21b69dbe51fb3f9
Author: Ben Skeggs <bskeggs at redhat.com>
Date:   Fri Jul 13 16:49:49 2012 +1000

    drm/nv04-nv40/fifo: remove use of nouveau_gpuobj_new_fake()

    Signed-off-by: Ben Skeggs <bskeggs at redhat.com>

:040000 040000 29a991b723d037cfe7fb7a5dd3a34b8321e489d1
cb531c96db341f2340f62511cb7dc1c2b84cefc5 M    drivers

And the bisect log:

# bad: [29594404d7fe73cd80eaa4ee8c43dcc53970c60e] Linux 3.7
# good: [a0d271cbfed1dd50278c6b06bead3d00ba0a88f9] Linux 3.6
git bisect start 'v3.7' 'v3.6' '--'
'drivers/gpu/drm/nouveau/'
# bad: [cd8c14b407d59ac4b8d324f5f9cdf223a2079c88] drm/nvc0/ltcg: read LTS count
at startup
git bisect bad cd8c14b407d59ac4b8d324f5f9cdf223a2079c88
# bad: [c4afbe74cebf887d3d8e7a11aa93bebcb6a3e2e1] drm/nvc0-/gr: share headers
between fermi and kepler graphics code
git bisect bad c4afbe74cebf887d3d8e7a11aa93bebcb6a3e2e1
# good: [0134a97979a0abc1c756b0fe491e074693c2bdf5] drm/nv50-/instmem: allocate
vram for kernel objects from end of vram
git bisect good 0134a97979a0abc1c756b0fe491e074693c2bdf5
# bad: [8a9b889e668a5bc2f4031015fe4893005c43403d] drm/nouveau: remove last use
of nouveau_gpuobj_new_fake()
git bisect bad 8a9b889e668a5bc2f4031015fe4893005c43403d
# bad: [70ee6f1cd6911098ddd4c11ee21b69dbe51fb3f9] drm/nv04-nv40/fifo: remove
use of nouveau_gpuobj_new_fake()
git bisect bad 70ee6f1cd6911098ddd4c11ee21b69dbe51fb3f9
# good: [af7afbd2e1409168698bde2f2846848b07d05d12] drm/nv04-nv40/instmem:
duplicate nv04 code as nv40, remove alternate paths
git bisect good af7afbd2e1409168698bde2f2846848b07d05d12
# good: [5787640db6ae722aeadb394d480c7ca21b603e34] drm/nv04-nv40/instmem:
remove use of nouveau_gpuobj_new_fake()
git bisect good 5787640db6ae722aeadb394d480c7ca21b603e34

And my notes on the bisect kernels:

cd8c14b407d59ac4b8d324f5f9cdf223a2079c88 hangs at gdm
c4afbe74cebf887d3d8e7a11aa93bebcb6a3e2e1 hangs at initial modeset
0134a97979a0abc1c756b0fe491e074693c2bdf5 works
8a9b889e668a5bc2f4031015fe4893005c43403d initial modeset: blank screen followed
by dpms off, keyboard still works
70ee6f1cd6911098ddd4c11ee21b69dbe51fb3f9 again blank screen/dpms off at initial
modeset
af7afbd2e1409168698bde2f2846848b07d05d12 works
5787640db6ae722aeadb394d480c7ca21b603e34 works

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--- Comment #7 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
Searching for that commit id, I found
https://bugzilla.kernel.org/show_bug.cgi?id=50091 which has very similar
symptoms (hang on X server startup, garbled screen) and is also NV40 family.

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--- Comment #8 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
Finally made it work on both 3.8 and 3.7.9: just add nouveau.noaccel=1 and
there is no hang. Of course, that does not fix the bug, just avoids it.

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--- Comment #9 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
Created attachment 75421
  --> https://bugs.freedesktop.org/attachment.cgi?id=75421&action=edit
dmesg for 3.8 with nouveau.noaccel=1

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--- Comment #10 from Cesar Eduardo Barros <cesarb at cesarb.net> ---
Created attachment 75422
  --> https://bugs.freedesktop.org/attachment.cgi?id=75422&action=edit
Xorg.0.log for 3.8 with nouveau.noaccel=1

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comer352l at web.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |comer352l at web.de
           See Also|                            |https://bugzilla.kernel.org
                   |                            |/show_bug.cgi?id=50091

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Maarten Lankhorst <m.b.lankhorst at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
           Assignee|nouveau at lists.freedesktop.o |m.b.lankhorst at gmail.com
                   |rg                          |

--- Comment #11 from Maarten Lankhorst <m.b.lankhorst at gmail.com> ---
Created attachment 79949
  --> https://bugs.freedesktop.org/attachment.cgi?id=79949&action=edit
initialize ramfc to zero

Just guessing, based on the commit itself. Does the patch help?

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Maarten Lankhorst <bugs at mblankhorst.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|bugs at mblankhorst.nl         |nouveau at
lists.freedesktop.o
                   |                            |rg

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #15 from Martin Peres <martin.peres at free.fr> ---
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