[Bug 206519] New: [amdgpu] kernel NULL pointer dereference on shutdown

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206519

            Bug ID: 206519
           Summary: [amdgpu] kernel NULL pointer dereference on shutdown
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.5.1.arch1-1, 5.5.3-arch1-1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: shlomo at fastmail.com
        Regression: No

Created attachment 287353
  --> https://bugzilla.kernel.org/attachment.cgi?id=287353&action=edit
shutdown screen photo

When I try to power off my machine, it shows the usual shutdown messages and
the screens turn off, but the machine is still powered on. The virtual console
shows a kernel NULL pointer dereference at address 0.

I run Arch Linux.

The bug occurs even if I never run X. I can turn on the machine and immediately
try to shut it down, and the same bug still occurs.

This bug occurred since I upgraded linux 5.4.15.arch1-1 to 5.5.1.arch1-1. I now
run linux 5.5.3.arch1-1 and the bug still exists.

My graphics card is Gigabyte Radeon RX VEGA 56 GAMING OC 8G, connected to six
monitors.

A photo of the screen at shutdown is attached. I think these are the relevant
lines for this bug:

BUG: kernel NULL pointer dereference, address: 0 [...]
RIP: 0010:queue_work_on+0x17/0x40
Code: fd ff ff 44 89 e0 5d 41 5c c3 [...]
Call Trace:
 handle_hpd_rx_irq+0x26e/0x320 [amdgpu]
 ? _raw_spin_unlock_irq+0x1d/0x30
 dm_irq_work_func+0x49/0x60 [amdgpu]
 process_one_work+0x1e1/0x3d0
 [...]

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