https://bugs.freedesktop.org/show_bug.cgi?id=96876

            Bug ID: 96876
           Summary: system freeze "fifo: gr engine fault on channel 6"
                    NVIDIA
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: dashesy-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 124976
  --> https://bugs.freedesktop.org/attachment.cgi?id=124976&action=edit
acpidump

I saw some similarity with bug #93629, but this is not related to any
SCHED_ERROR. Also it is very often, usually chrome triggering it. 
I had problem with this GC, turning off the monitors on startup, but that
problem is now fixed in the latest kernel.

$ journalctl --no-pager -b -2 -p err
-- Logs begin at Thu 2016-05-05 05:39:48 PDT, end at Sat 2016-07-09 16:10:13
PDT. --
Jul 04 02:15:01 dashesy.wavelet kernel: nouveau 0000:01:00.0: priv: HUB0:
086014 ffffffff (1f70820c)
Jul 04 09:15:32 dashesy.wavelet mcelog[877]: Family 6 Model 5e CPU: only
decoding architectural errors
Jul 04 09:15:33 dashesy.wavelet bluetoothd[873]: Failed to obtain handles for
"Service Changed" characteristic
Jul 04 09:16:01 dashesy.wavelet spice-vdagent[1546]: Cannot access vdagent
virtio channel /dev/virtio-ports/com.redhat.spice.0
Jul 04 09:17:36 dashesy.wavelet spice-vdagent[2064]: Cannot access vdagent
virtio channel /dev/virtio-ports/com.redhat.spice.0
Jul 04 12:24:41 dashesy.wavelet kernel: nouveau 0000:01:00.0: Invalid PCI ROM
header signature: expecting 0xaa55, got 0xffff
Jul 09 09:59:48 dashesy.wavelet kernel: nouveau 0000:01:00.0: fifo: read fault
at 0000260000 engine 00 [GR] client 01 [GPC0/T1_0] reason 02 [PTE] on channel 6
[007fb61000 systemd-logind[859]]
Jul 09 09:59:48 dashesy.wavelet kernel: nouveau 0000:01:00.0: fifo: gr engine
fault on channel 6, recovering...
Jul 09 09:59:48 dashesy.wavelet kernel: nouveau 0000:01:00.0: gr: TRAP ch 6
[007fb61000 systemd-logind[859]]
Jul 09 09:59:48 dashesy.wavelet kernel: nouveau 0000:01:00.0: gr:
GPC0/TPC0/TEX: 80000049
Jul 09 09:59:48 dashesy.wavelet kernel: nouveau 0000:01:00.0: gr:
GPC0/TPC1/TEX: 80000049


$ lspci -v
01:00.0 VGA compatible controller: NVIDIA Corporation GK208 [GeForce GT 730]
(rev a1) (prog-if 00 [VGA controller])
        Subsystem: Dell Device 1083
        Flags: bus master, fast devsel, latency 0, IRQ 126
        Memory at de000000 (32-bit, non-prefetchable) [size=16M]
        Memory at d0000000 (64-bit, prefetchable) [size=128M]
        Memory at d8000000 (64-bit, prefetchable) [size=32M]
        I/O ports at e000 [size=128]
        Expansion ROM at df000000 [disabled] [size=512K]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Legacy Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [128] Power Budgeting <?>
        Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024
<?>
        Kernel driver in use: nouveau
        Kernel modules: nouveau

$ uname -a
Linux dashesy.wavelet 4.5.7-202.fc23.x86_64 #1 SMP Tue Jun 28 18:22:51 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux


This is a complete hang, and seems to happen quite enough, I will gladly run
any kernel/driver combination to sort this out.

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