[Bug 91961] Hard lock after running built-in radeon.ko tests (Linux kernel 4.2.0)

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=91961

            Bug ID: 91961
           Summary: Hard lock after running built-in radeon.ko tests
                    (Linux kernel 4.2.0)
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: ikalvachev@gmail.com

Created attachment 118192
  --> https://bugs.freedesktop.org/attachment.cgi?id=118192&action=edit
Kernel logs from running both test at the same time and from running the second
test only..

Built-in tests are enabled by the module "option radeon test=3". The integer
value bits are used as flags what test to run on the module load.

Running both test takes about 1-2 minutes to complete. The first one turns off
the display and trashes the system in a way that the first key pressed hangs it
hard - no flashing LEDs, no Magic SysRq.

---
The first test moves data from system ram to video ram and back.
It runs for about a minute. During that time the monitor is turning off and on
again (DELLs do that if DPMS signaling is not exactly right, its on DVI port).
The rest of the system seems to function. Boot loading seams to finish and
sometimes I can salvage complete kernel message log. Pressing CapsLock turns on
its LED, but second press have no effect. Even pressing Magic SysRq first
doesn't provide any control of the system. It hangs hard and only reset helps.

The seconds test is about syncing between GPU rings.
It seems to finish without error if run after the first one.
However if I run it alone with "test=2", I get a bunch of timeouts, "GPU
lockup" and other errors. When run alone the test doesn't prevent setting of
working graphic mode.

My videocard is Radeon HD5670 (Redwood).
I have confirmation that the same happens on Tahiti chipsets.

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