[Bug 77892] New: [RV635] when GPU locks up, reset happens but X is unresponsive except mouse

[Bug 77892] New: [RV635] when GPU locks up, reset happens but X is unresponsive except mouse

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https://bugs.freedesktop.org/show_bug.cgi?id=77892

          Priority: medium
            Bug ID: 77892
          Assignee: dri-devel@lists.freedesktop.org
           Summary: [RV635] when GPU locks up, reset happens but X is
                    unresponsive except mouse
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: shawn.starr@rogers.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

For a long time now, I don't recall which 3.x broke this but there's been many
changes since and now, when the GPU does randomly reset, the display goes
blank, X display is restored, but I can only move mouse, cannot interact with
X.

Can someone point me to some debugging approaches to see if there's some lock
being held somewhere thats causing this?

I am able to ssh into the laptop so, this seems to point to some sort of lock
thats not released.

Bisecting radeon drm will be difficult if I have to start from near the
beginning of r600g drm support.

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[Bug 77892] [RV635] when GPU locks up, reset happens but X is unresponsive except mouse

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https://bugs.freedesktop.org/show_bug.cgi?id=77892

--- Comment #1 from Marek Olšák <maraeo@gmail.com> ---
This looks like a deadlock in the kernel. I guess some fence is not signalled
during the reset, so GEM_WAIT_IDLE never returns.

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[Bug 77892] [RV635] when GPU locks up, reset happens but X is unresponsive except mouse

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https://bugs.freedesktop.org/show_bug.cgi?id=77892

--- Comment #2 from Shawn Starr <shawn.starr@rogers.com> ---
How to debug? Do we have a flag to show lock/unlock states so i can try to pair
who forgot to release lock? is it X? is it drm driver?

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[Bug 77892] [RV635] when GPU locks up, reset happens but X is unresponsive except mouse

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https://bugs.freedesktop.org/show_bug.cgi?id=77892

--- Comment #3 from Shawn Starr <shawn.starr@rogers.com> ---
Even as of 3.14 final, this happens, 3.15-rc2 right now is too unstable for me
to boot into.

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[Bug 77892] [RV635] when GPU locks up, reset happens but X is unresponsive except mouse

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https://bugs.freedesktop.org/show_bug.cgi?id=77892

Shawn Starr <shawn.starr@rogers.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #4 from Shawn Starr <shawn.starr@rogers.com> ---
I don't use that dGPU much anymore, closing, and probably a lot of fixes have
occurred which may have solved this also.

I haven't tried a recent 4.8 kernel to confirm, but I still could for fun.
closing.

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