[Bug 63101] New: Hard lockup whel launching games like TF2 on kernels 3.11.5 and 3.12 rc4 and above

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=63101

            Bug ID: 63101
           Summary: Hard lockup whel launching games like TF2 on  kernels
                    3.11.5 and 3.12 rc4 and above
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.11.5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: laszlo.kertesz@gmail.com
        Regression: No

Created attachment 111161
  --> https://bugzilla.kernel.org/attachment.cgi?id=111161&action=edit
dmesg of the locked up session

I begin to experience system lockups when launching Team Fortress 2 on an
A8-5500 (using its integrated 7560 Radeon video with the radeon driver) - it
began starting around kernel 3.12 rc4, (i build the kernel from mainline git).
I have a leftover package of 3.12 rc3+ and that works fine.

This also happens with the stable 3.11.5 kernel version.

Kernel 3.11.0 doesnt have this issue.

As i launch the game, the menus are shown fine, but as soon as i enter the
actual game, either it crashes outright and throws me back to the desktop or i
have the last screen frozen.
In any way, i can move the mouse but cannot interact with windows, the keyboard
listens only to the magic keys. From time to timethe system beeps.
Dmesg is filled with warning and BUG/Oops entries.

Begins with:

Oct 15 21:21:17 laca-desktop kernel: [  355.859798] radeon 0000:00:01.0: GPU
lockup CP stall for more than 10000msec
Oct 15 21:21:17 laca-desktop kernel: [  355.859807] radeon 0000:00:01.0: GPU
lockup (waiting for 0x0000000000001276 last fence id 0x0000000000001275)
Oct 15 21:21:17 laca-desktop kernel: [  355.866308] [TTM] Buffer eviction
failed

Then follow warnings like:

WARNING: CPU: 3 PID: 4041 at drivers/gpu/drm/drm_mm.c:257
drm_mm_remove_node+0x104/0x110 [drm]()

After that the BUGs:

Oct 15 21:21:20 laca-desktop kernel: [  358.208965] BUG: unable to handle
kernel NULL pointer dereference at 0000000000000088

The system is unusable (i can move the mouse pointer in best case), i have to
reboot with the sysrq combinations.

All of the problematic kernels share the new cpufreq code i suppose, they all
work the same way - instead of powering the CPU between 0.9-1.34v as the
kernels before, now i have 0.65-1.22 volts, the CPU barely reaching its nominal
3.2 GHz speed, and never above (before it was up to ~3.5GHz and boosting was
working, now core boosting never works).

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