[Bug 99524] kernel hangs during shutdown (similar to Bug 98200)

[Bug 99524] kernel hangs during shutdown (similar to Bug 98200)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=99524

            Bug ID: 99524
           Summary: kernel hangs during shutdown (similar to Bug 98200)
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: 10dmar10@gmail.com

Created attachment 129131
  --> https://bugs.freedesktop.org/attachment.cgi?id=129131&action=edit
serial terminal capture (power on, login, shutdown)

Hi,

this bug is similar to Bug 98200.

Since upgrade from kernel 4.8.17 to 4.9.{1,2,5} I am unable to restart or
shutdown my PC. 
Poweroff/restart always ends with black screen (display shows "no signal"). 
System stays frozen with fans / hard discs spinning. 
Reset button does not bring the system back - it stays completely frozen.
Only manual (power button) power off/on cycle brings the system back.

GPU: [AMD/ATI] Juniper XT [Radeon HD 5770]

I was able to capture kernel messages over serial line, last lines:

...
[  136.326236] systemd-shutdown[1]: All loop devices detached.
[  136.353887] kvm: exiting hardware virtualization
[  136.380090] Console: switching to colour VGA+ 80x25
[  136.406675] [drm] radeon: finishing device.  

I tested kernel 4.9.1, 4.9.2 and 4.9.5.

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[Bug 99524] kernel hangs during shutdown (similar to Bug 98200)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=99524

--- Comment #1 from Peter Bowey <support@pbcomp.com.au> ---
I also have this problem:

Kernel 4.9.5 and 4.9.4 both fail on restart or shutdown (same symptoms).

Kernel 4.8.16 and earlier are OK.

Video card:

Advanced Micro Devices, Inc. [AMD/ATI] Redwood XT GL [FirePro V4800]

        Subsystem: Hewlett-Packard Company Device 2306
        Physical Slot: 2
        Flags: bus master, fast devsel, latency 0, IRQ 29
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at f0100000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at 2100 [size=256]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
<?>
        Capabilities: [150] Advanced Error Reporting
        Capabilities: [240] Power Budgeting <?>
        Kernel driver in use: radeon
        Kernel modules: radeon

Serial Capture logs show the same kernel data as for @wwa

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[Bug 99524] kernel hangs during shutdown (similar to Bug 98200)

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https://bugs.freedesktop.org/show_bug.cgi?id=99524

--- Comment #2 from Alex Deucher <alexdeucher@gmail.com> ---
Created attachment 129145
  --> https://bugs.freedesktop.org/attachment.cgi?id=129145&action=edit
possible fix

Does the attached patch help?

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[Bug 99524] kernel hangs during shutdown (similar to Bug 98200)

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https://bugs.freedesktop.org/show_bug.cgi?id=99524

--- Comment #3 from wwa <10dmar10@gmail.com> ---

Yes, "possible fix" patch fixes the problem, tested with 4.9.5.

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[Bug 99524] kernel hangs during shutdown (similar to Bug 98200)

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https://bugs.freedesktop.org/show_bug.cgi?id=99524

wwa <10dmar10@gmail.com> changed:

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

--- Comment #4 from wwa <10dmar10@gmail.com> ---
Bug fixed in 4.9.7, thanks.

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