[Bug 105367] Dell XPS 13 and TB16: null pointer upon resume from hibernation/sleep

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105367

--- Comment #13 from aappddeevv at gmail.com ---
Ouch, I turned off i915 debugging and actually started running 4.16. Of course,
the next morning I ran into this bug again. I don't have debug logs but here's
some text. I think 4.16 is more stable with the dock but not that much more. My
machine froze and I had to reboot. The scenario was that I undocked at night.
Hibernated, then resumed in the morning. Then plugged the dock back in. Froze
immediately.

Apr 05 07:55:44 nc6910p kernel: RIP: drm_dp_get_mst_branch_device+0xc6/0xf0
[drm_kms_helper] RSP: ffffaf348944fce8
Apr 05 07:55:44 nc6910p kernel: Code: 02 eb a4 48 8b 6f 20 48 85 ed 75 e0 45 0f
b6 04 24 44 89 e9 48 c7 c2 98 50 49 c0 31 f6 48 c7 c7 fc 63 49 c0 e8 6c 94 f8
ff eb 0a <f0> ff 45 00 0f 88 19 dd 00 00 48 89 df e8 78 8d 43 e8 48 89 e8 
Apr 05 07:55:44 nc6910p kernel:  ret_from_fork+0x35/0x40
Apr 05 07:55:44 nc6910p kernel:  ? kthread_create_worker_on_cpu+0x70/0x70
Apr 05 07:55:44 nc6910p kernel:  kthread+0x113/0x130
Apr 05 07:55:44 nc6910p kernel:  ? process_one_work+0x360/0x360
Apr 05 07:55:44 nc6910p kernel:  worker_thread+0x2e/0x380
Apr 05 07:55:44 nc6910p kernel:  process_one_work+0x175/0x360
Apr 05 07:55:44 nc6910p kernel:  i915_digport_work_func+0x8d/0x110 [i915]
Apr 05 07:55:44 nc6910p kernel:  ? __switch_to_asm+0x40/0x70
Apr 05 07:55:44 nc6910p kernel:  ? __switch_to+0xa2/0x4c0
Apr 05 07:55:44 nc6910p kernel:  ? __switch_to_asm+0x34/0x70
Apr 05 07:55:44 nc6910p kernel:  ? __switch_to_asm+0x40/0x70
Apr 05 07:55:44 nc6910p kernel:  ? __switch_to_asm+0x34/0x70
Apr 05 07:55:44 nc6910p kernel:  ? __switch_to_asm+0x40/0x70
Apr 05 07:55:44 nc6910p kernel:  ? __switch_to_asm+0x34/0x70
Apr 05 07:55:44 nc6910p kernel:  ? __switch_to_asm+0x40/0x70
Apr 05 07:55:44 nc6910p kernel:  intel_dp_hpd_pulse+0x1f9/0x380 [i915]
Apr 05 07:55:44 nc6910p kernel:  intel_dp_check_mst_status+0xc1/0x200 [i915]
Apr 05 07:55:44 nc6910p kernel:  ? intel_dp_check_mst_status+0xc1/0x200 [i915]
Apr 05 07:55:44 nc6910p kernel:  drm_dp_mst_hpd_irq+0x10b/0x8d0
[drm_kms_helper]
Apr 05 07:55:44 nc6910p kernel: Call Trace:
Apr 05 07:55:44 nc6910p kernel: CR2: 0000000000000000 CR3: 000000031020a005
CR4: 00000000003606e0
Apr 05 07:55:44 nc6910p kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Apr 05 07:55:44 nc6910p kernel: FS:  0000000000000000(0000)
GS:ffff8fc23ed00000(0000) knlGS:0000000000000000
Apr 05 07:55:44 nc6910p kernel: R13: 0000000000000001 R14: ffff8fc227865750
R15: ffff8fc227865718
Apr 05 07:55:44 nc6910p kernel: R10: ffffaf348944fce8 R11: 000000000000006b
R12: ffff8fc227865888
Apr 05 07:55:44 nc6910p kernel: RBP: 0000000000000000 R08: ffff8fc23ed21560
R09: 0000000000000000
Apr 05 07:55:44 nc6910p kernel: RDX: 0000000000000000 RSI: ffff8fc23ece0000
RDI: ffff8fc2278659e8
Apr 05 07:55:44 nc6910p kernel: RAX: 0000000000000000 RBX: ffff8fc2278659e0
RCX: ffff8fc23ece0001
Apr 05 07:55:44 nc6910p kernel: RSP: 0018:ffffaf348944fce8 EFLAGS: 00010246
Apr 05 07:55:44 nc6910p kernel: RIP:
0010:drm_dp_get_mst_branch_device+0xc6/0xf0 [drm_kms_helper]
Apr 05 07:55:44 nc6910p kernel: Workqueue: i915-dp i915_digport_work_func
[i915]
Apr 05 07:55:44 nc6910p kernel: Hardware name: Dell Inc. XPS 13 9350/0H67KH,
BIOS 1.6.1 12/14/2017
Apr 05 07:55:44 nc6910p kernel: CPU: 2 PID: 22385 Comm: kworker/u8:52 Tainted:
G           OE    4.16.0-1.vanilla.knurd.1.fc27.x86_64 #1
Apr 05 07:55:44 nc6910p kernel:  intel_lpss_pci intel_lpss wmi intel_hid
sparse_keymap int3403_thermal int3400_thermal pinctrl_sunrisepoint
acpi_thermal_rel int340x_thermal_zone pinctrl_intel acpi_pad nfsd auth_rpcgss
nfs_acl lockd grace sunrpc binfmt_misc i915 rtsx_pci_sdmmc mmc_core
i2c_algo_bit drm_kms_helper crc32
Apr 05 07:55:44 nc6910p kernel:  videobuf2_common videodev media ecdh_generic
arc4 snd_hda_codec_hdmi snd_soc_skl snd_soc_skl_ipc snd_hda_ext_core
snd_soc_sst_dsp snd_soc_sst_ipc snd_soc_acpi mac80211 snd_soc_core dell_wmi
dell_laptop snd_hda_codec_realtek snd_hda_codec_generic intel_rapl iTCO_wdt
iTCO_vendor_support 
Apr 05 07:55:44 nc6910p kernel: Modules linked in: ccm iwlmvm uinput
hid_plantronics cdc_ether usbnet snd_usb_audio snd_usbmidi_lib snd_rawmidi
r8152 mii thunderbolt nvmem_core rfcomm vmnet(OE) vmmon(OE)
nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT
nf_reject_ipv6 xt_conntrack ip_set n
Apr 05 07:55:44 nc6910p kernel: Oops: 0002 [#1] SMP PTI
Apr 05 07:55:44 nc6910p kernel: PGD 0 P4D 0 
Apr 05 07:55:44 nc6910p kernel: IP: drm_dp_get_mst_branch_device+0xc6/0xf0
[drm_kms_helper]
Apr 05 07:55:44 nc6910p kernel: BUG: unable to handle kernel NULL pointer
dereference at 0000000000000000

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