[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 #6 from Brad Campbell <brad at fnarfbargle.com> ---
I thought given these generally result in a stack canary I'd try something
different. Upgraded to latest linus-git and disabled the stack protector.

It did take a bit longer to hit, but we got there.

[ 8044.605803] do_IRQ: 2.205 No irq handler for vector
[ 8044.605814] do_IRQ: 2.233 No irq handler for vector
[ 8044.605821] invalid opcode: 0000 [#1] SMP
[ 8044.605824] CPU: 2 PID: 1476 Comm: kworker/2:2 Not tainted 5.4.0-rc4-bkc1+
#3
[ 8044.605826] Hardware name: Apple Inc. iMac12,2/Mac-942B59F58194171B, BIOS
82.0.0.0.0 09/25/2018
[ 8044.605847] Workqueue: events radeon_dp_work_func [radeon]
[ 8044.605866] RIP: 0010:atom_op_move+0x124/0x1d0 [radeon]
[ 8044.605869] Code: 20 c0 e8 03 83 e0 07 74 2e 8d 4a 03 83 c2 02 3c 04 0f 42
d1 41 89 14 24 eb 07 83 c2 02 41 89 14 24 c7 44 24 08 cd cd cd cd e9 <42> ff ff
ff 83 c2 03 41 89 14 24 eb ea 83 c2 05 41 89 14 24 eb e1
[ 8044.605871] RSP: 0018:ffffc9000034fe50 EFLAGS: 00010292
[ 8044.605880] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
0000000000000004
[ 8044.605881] RDX: 0000000000000000 RSI: 0000000000000004 RDI:
ffffc9000034fe3a
[ 8044.605883] RBP: ffff8882633d0000 R08: ffffffffa0201837 R09:
0000000000000006
[ 8044.605884] R10: 0000000000000006 R11: 000000000001a800 R12:
ffff8882658eb1a0
[ 8044.605886] R13: 0000000000000000 R14: ffff888267b22c00 R15:
0000000000000000
[ 8044.605887] FS:  0000000000000000(0000) GS:ffff888267b00000(0000)
knlGS:0000000000000000
[ 8044.605889] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 8044.605890] CR2: 000031fd52e7a000 CR3: 00000001d1197002 CR4:
00000000000606a0
[ 8044.605892] Call Trace:
[ 8044.605907]  ? radeon_dp_work_func+0x28/0x40 [radeon]
[ 8044.605911]  ? process_one_work+0x1b4/0x330
[ 8044.605913]  ? worker_thread+0x44/0x3d0
[ 8044.605923]  ? set_worker_desc+0x90/0x90
[ 8044.605925]  ? kthread+0xec/0x120
[ 8044.605927]  ? kthread_create_worker_on_cpu+0x40/0x40
[ 8044.605930]  ? ret_from_fork+0x1f/0x30
[ 8044.605932] 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 applesmc input_polldev kvm_intel
led_class kvm irqbypass btusb btbcm uvcvideo btintel bluetooth
videobuf2_vmalloc snd_usb_aud
io videobuf2_memops rfkill videobuf2_v4l2 videodev snd_usbmidi_lib ecdh_generic
videobuf2_common ecc joydev snd_hda_codec_cirrus snd_rawmidi snd_hda_codec_hdmi
snd_hda_codec_generic evdev snd_hda_intel snd_intel_nhlt snd_hda_codec
snd_hwdep snd_hda_core snd_pcm snd_timer snd soundcore button apple_bl ext4
crc32c_gen
eric 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 ahci libahci radeon xhci_pci xhci_hcd i2c_algo_bit backlight
drm_kms_helper syscopyarea tg3 sysfillrect sysimgblt fb_sys_fops ehci_pci
uhci_hcd libphy
 ttm ehci_hcd firewire_ohci firewire_core drm crc_itu_t
[ 8044.605961]  usbcore usb_common i2c_core
[ 8044.605967] ---[ end trace 78992a27b7291279 ]---
[ 8044.605977] RIP: 0010:atom_op_move+0x124/0x1d0 [radeon]
[ 8044.605979] Code: 20 c0 e8 03 83 e0 07 74 2e 8d 4a 03 83 c2 02 3c 04 0f 42
d1 41 89 14 24 eb 07 83 c2 02 41 89 14 24 c7 44 24 08 cd cd cd cd e9 <42> ff ff
ff 83 c2 03 41 89 14 24 eb ea 83 c2 05 41 89 14 24 eb e1
[ 8044.605980] RSP: 0018:ffffc9000034fe50 EFLAGS: 00010292
[ 8044.605983] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
0000000000000004
[ 8044.605985] RDX: 0000000000000000 RSI: 0000000000000004 RDI:
ffffc9000034fe3a
[ 8044.605986] RBP: ffff8882633d0000 R08: ffffffffa0201837 R09:
0000000000000006
[ 8044.605987] R10: 0000000000000006 R11: 000000000001a800 R12:
ffff8882658eb1a0
[ 8044.605989] R13: 0000000000000000 R14: ffff888267b22c00 R15:
0000000000000000
[ 8044.605990] FS:  0000000000000000(0000) GS:ffff888267b00000(0000)
knlGS:0000000000000000
[ 8044.605991] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 8044.605993] CR2: 000031fd52e7a000 CR3: 00000001d1197002 CR4:
00000000000606a0
[ 8044.605994] Kernel panic - not syncing: Fatal exception
[ 8044.606020] Kernel Offset: disabled
[ 8044.606022] Rebooting in 10 seconds..
[ 8054.606406] ACPI MEMORY or I/O RESET_REG.

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