[Bug 96360] VM fault with kernel 4.7-rc1 on Alien: Isolation

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96360

--- Comment #1 from Alexandre Demers  ---
So this is the commit that exposes the bug.

3d02b7fee9c3ece1746f5b06c4143b511383fc6b is the first bad commit
commit 3d02b7fee9c3ece1746f5b06c4143b511383fc6b
Author: Bas Nieuwenhuizen 
Date:   Fri Apr 15 02:47:49 2016 +0200

drm/radeon: Allow setting shader registers using DMA/COPY packet3 on SI.

Mesa uses a COPY_DATA packet to copy the grid size for indirect dispatches
into COMPUTE_USER_DATA_*.

Setting those registers with a SET_SH_REG packet is allowed, not allowing
them with other packets seems like an oversight.

v2: Clarify commit message.

Signed-off-by: Bas Nieuwenhuizen 
Signed-off-by: Alex Deucher 

:04 04 ec4d58f4c4e5bd746474776c852a7c70763183a7
8ba67a00f061b454d1600838bf620e1e937e9461 M  drivers

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[Bug 96360] VM fault with kernel 4.7-rc1 on Alien: Isolation

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96360

Bug ID: 96360
   Summary: VM fault with kernel 4.7-rc1 on Alien: Isolation
   Product: DRI
   Version: DRI git
  Hardware: Other
OS: All
Status: NEW
  Severity: normal
  Priority: medium
 Component: DRM/Radeon
  Assignee: dri-devel at lists.freedesktop.org
  Reporter: alexandre.f.demers at gmail.com

Created attachment 124312
  --> https://bugs.freedesktop.org/attachment.cgi?id=124312=edit
VM faults in dmesg triggered by Alien: Isolation

Hi,

I've recently begun playing Alien: Isolation now that the compute shaders are
available when combining latest Mesa with a 4.7-git kernel. However, my
computer freezes after sometime. Poking dmesg got me a repeating VM fault which
goes on as long as I'm in the game (playing, not the menu or while loading).

Setup:
GPU -> R9 280X
Kernel -> 4.7-rc1
Distribution -> Archlinux 64
Mesa, drm, ddx -> using latest code from git repositories

I'll try with a 4.6 kernel to see if this bug was introduced in or exposed by
the 4.7 branch. 

Attaching dmesg

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