[Bug 100465] Hard lockup with radeonsi driver on FirePro W600, W9000 and W9100

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=100465

            Bug ID: 100465
           Summary: Hard lockup with radeonsi driver on FirePro W600,
                    W9000 and W9100
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: julien.isorce@gmail.com

Created attachment 130563
  --> https://bugs.freedesktop.org/attachment.cgi?id=130563&action=edit
dmesg

The machine completely freeze using radeonsi driver with FirePro W600, W9000
and W9100.

* Steps to reproduce:

wget
http://www.phoronix-test-suite.com/benchmark-files/GpuTest_Linux_x64_0.7.0.zip
DISPLAY=:0 ./GpuTest /test=fur /fullscreen

* Acutal result:

System and screen are frozen after a few minutes (sometimes a few seconds,
sometimes 20 min). No mouse/keyboard. Does not respond to ping. No kernel
panic. Requires hard reboot.

After reboot, no error in /var/log/kern.log. Empty dir /var/crash, empty dir
/sys/fs/pstore. Sometimes some nul characters ^@ just before the next "Linux
version".
Using a serial console does not show additional debug messages.

* Expected result:

No system freeze.

* List of things that have been tried but leading to the same result:

- kernel 4.4.X, 4.8.x packaged by ubuntu.
- amd-staging-4.9 from https://cgit.freedesktop.org/~agd5f/linux.
- a few 4.10 kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/ .
- radeon.dpm=1 (all values for power_dpm_state /
power_dpm_force_performance_level)
- radeon.dpm=0 (power_mode=profile and all values for power_profile)
- radeon.msi=1 / 0.
- DRI2 / DRI3
- glamor / no accel, TearFree on / off
- single monitor, multi monitor, resolutions 1600x1200, 1920x1080.
- Latest libdrm / mesa. llvm 3.8, 4 and 5.

* List of things that avoids the system freeze:

- radeon.gartsize=512 radeon.vramlimit=1024

* Others:

- apitrace trace then replay does not lead to the freeze.
- No errors with R600_DEBUG=* or MESA_DEBUG.
- strace sometimes shows that the last call is ioctl(RADEON_CS) but not sure
how reliable this is provinding the last print might not be flush.
- Happens with 2 differents brand for the mother board.
- takes a bit longer for the mentioned GpuTest to freeze the machine on W9000
and W9100.

* TODOs:

- Try again kgdb.
- Try amdgpu instead of radeonsi.

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