[Bug 110421] New: Reading debugfs file /sys/kernel/debug/dri/0/amdgpu_regs hangs the machine

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=110421

            Bug ID: 110421
           Summary: Reading debugfs file
                    /sys/kernel/debug/dri/0/amdgpu_regs hangs the machine
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.4.0-0.rc8.git0.1.fc24.x86_64
          Hardware: All
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: rivanvx@gmail.com
        Regression: No

I am using amdgpu driver on

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Amethyst XT [Radeon R9 M295X Mac Edition / R9 380X] [1002:6938] (rev
f1)

Running the following script

for i in $(seq 0 65535); do echo -n "$i: "; dd if=amdgpu_regs bs=4 skip=$i
count=1 2>/dev/null | hexdump -e '"%08x"'; echo; done

hangs the machine at register 14829 and the data from the register is not
printed. I tried reading the registers twice just to be sure it hangs in the
same place repeatedly, and it was 14829 in both cases.

I have reports this is reproducible using vanilla kernel.

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