[Bug 57122] [g4x regression] Graphics crash on Intel G41 under 3.7-rc3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57122

--- Comment #23 from Alex Villacís Lasso <avillaci at ceibo.fiec.espol.edu.ec> ---
I am now running the requested branch. However, I am again experiencing the
"random stalls in graphics applications" issue that I reported in the mailing
list back when I tested master 3.7-rc2 . Here is what I reported at that time:

--------start quote--------
I am testing linux-3.7-rc2 in Fedora 16 x86_64 in a workstation at my day job.
My kernel configuration is attached. My graphics chipset shows up in lspci as
follows:

00:02.0 VGA compatible controller [0300]: Intel Corporation 4 Series Chipset
Integrated Graphics Controller [8086:2e32] (rev 03) (prog-if 00 [VGA
controller])
    Subsystem: Intel Corporation Device [8086:d612]
    Flags: bus master, fast devsel, latency 0, IRQ 43
    Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
    Memory at c0000000 (64-bit, prefetchable) [size=256M]
    I/O ports at f140 [size=8]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [d0] Power Management version 2
    Kernel driver in use: i915
    Kernel modules: i915

All the tests were made with the default KMS enabled, as setup by the distro.

With the distro-supplied linux-3.6.2-1, I have no problems at all with
graphics. Likewise with vanilla kernel 3.6.0.

With 3.7-rc1 onwards, and also 3.7-rc2, my workstation seems to boot normally
and I can login into Gnome Shell. However, after a while, some random graphical
client with which I am interacting stops responding. This stall is of random
length - sometimes it lasts a fraction of a second, or any interval up to a few
minutes. It seems that anything that causes the app to try to draw to the
screen might cause the stall, even something as simple as switching to the app.
So far, I have seen stalls while using the following apps: firefox,
thunderbird, eclipse, gnome-terminal, and even gnome-shell itself. When
gnome-shell is affected, the entire desktop freezes, and becomes unusable.
However, in all cases (even gnome-shell stalls), the mouse cursor can be moved,
and I can switch into other consoles with Ctrl-Alt-Fn very easily. When I
switch to a console, I can run top, and it shows me that the stalled
application is apparently burning CPU time at 99%, but the corresponding CPU is
busy in "system" time, not "user" time.

Interestingly, the xserver process itself has never been seen burning CPU when
these stalls happen.

I have tried killing the stalled gnome-shell with "kill -9 PID", but it proved
unkillable even by this. However I then restarted the X server with
Ctrl-Alt-Backspace, and this managed to terminate the same unkillable
gnome-shell.

I have also attached gdb to the stalled processes. However, the symbol loading
goes by at a snails pace, which is unusual. After that I managed to issue bt on
two processes. The results are attached. In both backtraces, the innermost
function is writev initiated by XPutImage.

I have seen nothing unusual for me in the dmesg output (attached) even with a
stalled process running.

It seems that this problem is unique to my workstation. My home machine has a
different Intel chipset (G31 if I remember correctly) but also runs Fedora 16
x86_64 with 3.7-rc2, and has never been affected by this issue.
--------end quote--------

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