[Bug 212137] New: kernel NULL pointer dereference, black screen when using two graphics cards

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=212137

            Bug ID: 212137
           Summary: kernel NULL pointer dereference, black screen when
                    using two graphics cards
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.11
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: mail at dennisfoster.us
        Regression: No

Created attachment 295741
  --> https://bugzilla.kernel.org/attachment.cgi?id=295741&action=edit
lspci -vvv

On linux v5.11 and above (up to 5.11.4) I cannot longer boot the system
(GNOME/Wayland) using two graphics cards. It gets stuck with black screen with
no response to keyboard/mouse.

In systemd journal there are some messages about kernel bug:

Mar 08 11:54:05 homeserver kernel: BUG: kernel NULL pointer dereference,
address: 0000000000000008
Mar 08 11:54:05 homeserver kernel: #PF: supervisor read access in kernel mode
Mar 08 11:54:05 homeserver kernel: #PF: error_code(0x0000) - not-present page
Mar 08 11:54:05 homeserver kernel: PGD 0 P4D 0
Mar 08 11:54:05 homeserver kernel: Oops: 0000 [#1] PREEMPT SMP NOPTI
Mar 08 11:54:05 homeserver kernel: CPU: 6 PID: 608 Comm: gnome-shell Tainted: G
OE 5.11.4-arch1-1 #1
Mar 08 11:54:05 homeserver kernel: Hardware name: Gigabyte Technology Co., Ltd.
A320M-S2H/A320M-S2H-CF, BIOS F2 11/03/2020
Mar 08 11:54:05 homeserver kernel: RIP:
0010:drm_gem_handle_create_tail+0xcb/0x190 [drm]
Mar 08 11:54:05 homeserver kernel: Code: 00 48 89 df e8 c6 20 59 f4 45 85 e4 78
77 48 8d 5d 18 4c 89 ee 48 89 df e8 42 fe 00 00 89 c2 85 c0 75 3e 48 8b 85 40
01 00 00 <48> 8b 40 08 48 85 c0 74 0f 4c 89 ee 48 89 ef e8 81 8b 91 f4 85 c0
Mar 08 11:54:05 homeserver kernel: RSP: 0018:ffffb7a7c16bfd30 EFLAGS: 00010246
Mar 08 11:54:05 homeserver kernel: RAX: 0000000000000000 RBX: ffffa0eabe065090
RCX: 0000000000000001


Everything works perfectly fine using current LTS v5.10.21.
I am using Radeon RX 470 as a primary card, and the older ATI FirePro 2270 as a
secondary one in order to provide two extra monitor outputs.

I've attached my lspci output as well as full systemd log.

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