[Bug 217587] New: amdgpu kernel NULL pointer dereference, address: 0000000000000054

[bugzilla-daemon at kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217587

            Bug ID: 217587
           Summary: amdgpu kernel NULL pointer dereference, address:
                    0000000000000054
           Product: Drivers
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: low
          Priority: P3
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: moviuro.kernel at popho.be
        Regression: No

Created attachment 304471
  --> https://bugzilla.kernel.org/attachment.cgi?id=304471&action=edit
dmesg (journalctl -k -b -1) & lspci -kkv

My 6.3.8 kernel says Oops, NULL pointer dereference, address: 0000000000000054,
when I successfully unlock my Xorg session that is locked by xsecurelock
(https://github.com/google/xsecurelock) when my screen(s) have not yet turned
back on.

* Lock the screen with `xsecurelock(1)`
* Wait until the monitors go to sleep (I unplug my mouse and keyboard thanks to
a little USB KVM)
* Quickly type my password and <enter> to unlock my session before the screens
turn back on

Unexpected: machine ~freeze (X11 not responsive, machine won't reboot properly
(`reboot`), but I can initiate a SSH session and `echo b > /proc/sysrq-target`)

The attached dmesg was obtained with `drm=debug=4` in cmdline.

`lspci -kkv` also attached.

Hardware list: B550 Phantom Gaming-ITX, 5800X, RX6950XT reference design card.

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