[Nouveau] [Bug 35876] New: Hard GPU hang on nvidia

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=35876

           Summary: Hard GPU hang on nvidia
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: maximlevitsky at gmail.com


Created an attachment (id=45137)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=45137)
git snapshot

Hardware: Geforce 8400M GS - (0x086700a2)
          Acer Aspire 5720G

Userspace: Git tips of all components except Xserver.
          In attached file, you see the latest commits of each tree

Kernel drm version: dd34154f9bd75d13caefffd9d6086a1d23a45856
          drm/nouveau: use static vidshift of 2 on volt 0x30 tables


This already happened here many times.
Just 2D usage of compiz is enough.
I will eventually test if even just 2D usage can trigger this.

I get this in the kernel log:

<3>[17638.684109] [drm] nouveau 0000:01:00.0: vm flush timeout: engine 0
<3>[17644.904441] [drm] nouveau 0000:01:00.0: PRAMIN flush timeout
<6>[17645.869768] [drm] nouveau 0000:01:00.0: PFIFO_INTR 0x04000000 - Ch 2
<3>[17645.966182] [drm] nouveau 0000:01:00.0: vm flush timeout: engine 5

(Extracted using ram based "black-box", a fixed area in the system memory I
read after a crash.)

System freezes fully.

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