[Bug 111659] Kernel panic when waking up after screens go to dpms sleep

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111659

--- Comment #9 from Brad Campbell <brad at fnarfbargle.com> ---
Another observation (after another lockup). I have the kernel set to reboot on
panic. On reboot the machine displays a grey screen (as it does on a normal
boot) but never gets to the bootloader.

I have to hard power cycle the machine. I suppose that might imply the card is
getting into a hardware state the firmware can't recover from.

I have observed this behaviour every time it has auto-rebooted. Still booting
with radeon.dpm=0.

.
[27018.029370] BUG: kernel NULL pointer dereference, address: 00000000000002b8
[27018.029383] #PF: supervisor read access in kernel mode
[27018.029386] #PF: error_code(0x0000) - not-present page
[27018.029389] PGD 0 P4D 0 
[27018.029394] Oops: 0000 [#1] SMP
[27018.029399] CPU: 2 PID: 6439 Comm: kworker/2:2 Not tainted 5.4.0-rc7-bkc1+
#5
[27018.029401] Hardware name: Apple Inc. iMac12,2/Mac-942B59F58194171B, BIOS
82.0.0.0.0 09/25/2018
[27018.029437] Workqueue: events radeon_dp_work_func [radeon]
[27018.029458] RIP: 0010:radeon_add_legacy_encoder+0x0/0x2d0 [radeon]
[27018.029462] Code: 3f a0 e8 f3 a1 d8 ff 4c 89 ef e8 db 42 e3 e0 eb d3 41 c6
45 08 00 e9 43 ff ff ff 48 c7 c7 b0 73 3e a0 e8 d3 a1 d8 ff eb de 90 <48> 8b 87
b8 02 00 00 4c 8d 87 b8 02 00 00 49 39 c0 74 24 3b 70 68
[27018.029466] RSP: 0018:ffffc90004dafe48 EFLAGS: 00010292
[27018.029469] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
0000000000000004
[27018.029471] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000000
[27018.029473] RBP: ffff888262820000 R08: ffffffffa0115837 R09:
0000000000000006
[27018.029476] R10: 0000000000000006 R11: 000000000000024c R12:
ffff8882625c5ba0
[27018.029478] R13: 0000000000000000 R14: ffff888267b22c00 R15:
0000000000000000
[27018.029481] FS:  0000000000000000(0000) GS:ffff888267b00000(0000)
knlGS:0000000000000000
[27018.029484] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[27018.029487] CR2: 00000000000002b8 CR3: 0000000001c09004 CR4:
00000000000606a0
[27018.029489] Call Trace:
[27018.029509]  radeon_get_legacy_connector_info_from_bios+0x399/0xb90 [radeon]
[27018.029531]  ? radeon_dp_work_func+0x28/0x40 [radeon]
[27018.029537]  ? process_one_work+0x1b4/0x330
[27018.029540]  ? worker_thread+0x44/0x3d0
[27018.029544]  ? set_worker_desc+0x90/0x90
[27018.029548]  ? kthread+0xec/0x120
[27018.029552]  ? kthread_create_worker_on_cpu+0x40/0x40
[27018.029556]  ? ret_from_fork+0x1f/0x30
[27018.029558] Modules linked in: cpufreq_userspace cpufreq_powersave
cpufreq_conservative nfsv4 nfsd auth_rpcgss nfs_acl nfs lockd grace fscache
sunrpc af_packet dm_crypt dm_mod dax coretemp kvm_intel kvm irqbypass applesmc
btusb input_polldev btbcm led_class btintel uvcvideo bluetooth
videobuf2_vmalloc rfkill videobuf2_memops snd_usb_audio videobuf2_v4l2 videodev
snd_usbmidi_lib ecdh_generic ecc joydev videobuf2_common snd_rawmidi evdev
snd_hda_codec_cirrus snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel
snd_intel_nhlt snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer snd
soundcore apple_bl button ext4 crc32c_generic crc16 mbcache jbd2 netconsole
configfs hid_apple hid_appleir usb_storage hid_generic usbhid hid sg sr_mod
cdrom sd_mod aesni_intel glue_helper crypto_simd cryptd radeon ahci libahci
i2c_algo_bit xhci_pci backlight xhci_hcd firewire_ohci drm_kms_helper ehci_pci
syscopyarea sysfillrect sysimgblt fb_sys_fops uhci_hcd tg3 ttm firewire_core
ehci_hcd libphy crc_itu_t drm
[27018.029601]  usbcore usb_common i2c_core
[27018.029610] CR2: 00000000000002b8
[27018.029613] ---[ end trace 7d5e64a9e69d86f6 ]---
[27018.029632] RIP: 0010:radeon_add_legacy_encoder+0x0/0x2d0 [radeon]
[27018.029636] Code: 3f a0 e8 f3 a1 d8 ff 4c 89 ef e8 db 42 e3 e0 eb d3 41 c6
45 08 00 e9 43 ff ff ff 48 c7 c7 b0 73 3e a0 e8 d3 a1 d8 ff eb de 90 <48> 8b 87
b8 02 00 00 4c 8d 87 b8 02 00 00 49 39 c0 74 24 3b 70 68
[27018.029639] RSP: 0018:ffffc90004dafe48 EFLAGS: 00010292
[27018.029641] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
0000000000000004
[27018.029643] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000000
[27018.029646] RBP: ffff888262820000 R08: ffffffffa0115837 R09:
0000000000000006
[27018.029648] R10: 0000000000000006 R11: 000000000000024c R12:
ffff8882625c5ba0
[27018.029651] R13: 0000000000000000 R14: ffff888267b22c00 R15:
0000000000000000
[27018.029653] FS:  0000000000000000(0000) GS:ffff888267b00000(0000)
knlGS:0000000000000000
[27018.029656] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[27018.029658] CR2: 00000000000002b8 CR3: 0000000001c09004 CR4:
00000000000606a0
[27018.029661] Kernel panic - not syncing: Fatal exception
[27018.029705] Kernel Offset: disabled
[27018.029709] Rebooting in 10 seconds..
[27028.030118] ACPI MEMORY or I/O RESET_REG.

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