The only suspicious entries in my /var/log/syslog from the time of the
crash, are a few entries like:

    May 31 14:05:16 caius kernel: [74723.170104] WARNING: CPU: 0 PID: 1479 at 
/build/linux-0XAgc4/linux-4.4.0/ubuntu/i915/intel_pm.c:3675 
skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]()
    May 31 14:05:16 caius kernel: [74723.170105] WARN_ON(!wm_changed)
    May 31 14:05:16 caius kernel: [74723.170124] Modules linked in: btusb btrtl 
cdc_acm drbg ansi_cprng ctr ccm nvram msr rfcomm cmac bnep binfmt_misc arc4 
hid_multitouch uvcvideo i2c_designware_platform dell_wmi i2
    c_designware_core videobuf2_vmalloc videobuf2_memops cdc_ether 
videobuf2_v4l2 videobuf2_core usbnet v4l2_common videodev r8152 mii media 
dcdbas dell_smm_hwmon intel_rapl x86_pkg_temp_thermal intel_powerclamp cor
    etemp snd_hda_codec_hdmi(OE) dell_led kvm_intel kvm irqbypass 
snd_hda_codec_realtek(OE) snd_hda_codec_generic(OE) ath10k_pci ath10k_core 
snd_hda_intel(OE) snd_hda_codec(OE) crct10dif_pclmul crc32_pclmul ath snd_
    hda_core(OE) mac80211 ghash_clmulni_intel aesni_intel snd_hwdep aes_x86_64 
lrw gf128mul glue_helper snd_pcm cfg80211 snd_seq_midi snd_seq_midi_event 
snd_rawmidi ablk_helper snd_seq cryptd rtsx_pci_ms memstick sn
    d_seq_device snd_timer mei_me hci_uart snd mei idma64 shpchp virt_dma 
soundcore joydev input_leds serio_raw btbcm btqca btintel intel_lpss_pci 
bluetooth processor_thermal_device intel_soc_dts_iosf acpi_als intel
    _hid(OE) kfifo_buf industrialio intel_lpss_acpi int3403_thermal 
int3400_thermal int340x_thermal_zone acpi_thermal_rel intel_lpss sparse_keymap 
dell_smo8800 acpi_pad mac_hid sunrpc parport_pc ppdev lp parport aut
    ofs4 btrfs xor hid_apple raid6_pq hid_generic usbhid rtsx_pci_sdmmc 
i915_bpo psmouse intel_ips i2c_algo_bit drm_kms_helper syscopyarea sysfillrect 
sysimgblt fb_sys_fops ahci drm rtsx_pci libahci wmi i2c_hid hid 
    pinctrl_sunrisepoint video pinctrl_intel fjes [last unloaded: btrtl]
    May 31 14:05:16 caius kernel: [74723.170142] CPU: 0 PID: 1479 Comm: Xorg 
Tainted: G        W  OE   4.4.0-78-generic #99-Ubuntu
    May 31 14:05:16 caius kernel: [74723.170142] Hardware name: Dell Inc. 
Precision 5520/0GPNW9, BIOS 1.0.2 12/28/2016
    May 31 14:05:16 caius kernel: [74723.170144]  0000000000000286 
00000000d1399a48 ffff880851797650 ffffffff813f8dd3
    May 31 14:05:16 caius kernel: [74723.170145]  ffff880851797698 
ffffffffc0287b58 ffff880851797688 ffffffff81081302
    May 31 14:05:16 caius kernel: [74723.170146]  ffff88085425d000 
ffff88085355a148 ffff88085425c000 ffff880853500b78
    May 31 14:05:16 caius kernel: [74723.170146] Call Trace:
    May 31 14:05:16 caius kernel: [74723.170148]  [<ffffffff813f8dd3>] 
dump_stack+0x63/0x90
    May 31 14:05:16 caius kernel: [74723.170150]  [<ffffffff81081302>] 
warn_slowpath_common+0x82/0xc0
    May 31 14:05:16 caius kernel: [74723.170151]  [<ffffffff8108139c>] 
warn_slowpath_fmt+0x5c/0x80
    May 31 14:05:16 caius kernel: [74723.170163]  [<ffffffffc01a8fec>] 
skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]
    May 31 14:05:16 caius kernel: [74723.170174]  [<ffffffffc01a9185>] 
skl_update_wm+0x185/0x610 [i915_bpo]
    May 31 14:05:16 caius kernel: [74723.170191]  [<ffffffffc023a42f>] ? 
intel_ddi_enable_transcoder_func+0x17f/0x260 [i915_bpo]
    May 31 14:05:16 caius kernel: [74723.170202]  [<ffffffffc01acf0e>] 
intel_update_watermarks+0x1e/0x30 [i915_bpo]
    May 31 14:05:16 caius kernel: [74723.170218]  [<ffffffffc021c701>] 
haswell_crtc_enable+0x761/0x8e0 [i915_bpo]
    May 31 14:05:16 caius kernel: [74723.170234]  [<ffffffffc0207d3e>] ? 
intel_finish_crtc_commit+0xe/0x10 [i915_bpo]
    May 31 14:05:16 caius kernel: [74723.170240]  [<ffffffffc01306e4>] ? 
drm_atomic_helper_commit_planes_on_crtc+0x154/0x270 [drm_kms_helper]
    May 31 14:05:16 caius kernel: [74723.170256]  [<ffffffffc0218606>] 
intel_atomic_commit+0x5d6/0x14a0 [i915_bpo]
    May 31 14:05:16 caius kernel: [74723.170269]  [<ffffffffc00cabfe>] ? 
drm_atomic_check_only+0x18e/0x590 [drm]
    May 31 14:05:16 caius kernel: [74723.170279]  [<ffffffffc00cb037>] 
drm_atomic_commit+0x37/0x60 [drm]
    May 31 14:05:16 caius kernel: [74723.170284]  [<ffffffffc013206f>] 
restore_fbdev_mode+0x22f/0x260 [drm_kms_helper]
    May 31 14:05:16 caius kernel: [74723.170294]  [<ffffffffc00c97ba>] ? 
drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
    May 31 14:05:16 caius kernel: [74723.170300]  [<ffffffffc0134243>] 
drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
    May 31 14:05:16 caius kernel: [74723.170304]  [<ffffffffc01342bd>] 
drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
    May 31 14:05:16 caius kernel: [74723.170320]  [<ffffffffc023263a>] 
intel_fbdev_set_par+0x1a/0x60 [i915_bpo]
    May 31 14:05:16 caius kernel: [74723.170322]  [<ffffffff8147e29f>] ? 
fb_set_var+0x2ef/0x460
    May 31 14:05:16 caius kernel: [74723.170323]  [<ffffffff8147e1e6>] 
fb_set_var+0x236/0x460
    May 31 14:05:16 caius kernel: [74723.170325]  [<ffffffff81718a97>] ? 
sock_poll+0x107/0x120
    May 31 14:05:16 caius kernel: [74723.170327]  [<ffffffff810b5823>] ? 
check_preempt_wakeup+0x193/0x220
    May 31 14:05:16 caius kernel: [74723.170327]  [<ffffffff810b5279>] ? 
update_curr+0x79/0x160
    May 31 14:05:16 caius kernel: [74723.170330]  [<ffffffff8147460f>] 
fbcon_blank+0x30f/0x350
    May 31 14:05:16 caius kernel: [74723.170331]  [<ffffffff8102d8c7>] ? 
__switch_to+0x437/0x5c0
    May 31 14:05:16 caius kernel: [74723.170334]  [<ffffffff8150fe63>] 
do_unblank_screen+0xd3/0x1a0
    May 31 14:05:16 caius kernel: [74723.170335]  [<ffffffff81504f59>] 
complete_change_console+0x59/0xe0
    May 31 14:05:16 caius kernel: [74723.170336]  [<ffffffff815056f0>] 
vt_ioctl+0x710/0x12f0
    May 31 14:05:16 caius kernel: [74723.170343]  [<ffffffffc00af759>] ? 
drm_ioctl+0x189/0x540 [drm]
    May 31 14:05:16 caius kernel: [74723.170344]  [<ffffffff814f892f>] 
tty_ioctl+0x35f/0xc40
    May 31 14:05:16 caius kernel: [74723.170346]  [<ffffffff811c1be0>] ? 
handle_mm_fault+0xce0/0x1820
    May 31 14:05:16 caius kernel: [74723.170347]  [<ffffffff8102d8c7>] ? 
__switch_to+0x437/0x5c0
    May 31 14:05:16 caius kernel: [74723.170349]  [<ffffffff81222e0f>] 
do_vfs_ioctl+0x29f/0x490
    May 31 14:05:16 caius kernel: [74723.170350]  [<ffffffff8106b544>] ? 
__do_page_fault+0x1b4/0x400
    May 31 14:05:16 caius kernel: [74723.170351]  [<ffffffff8183c8f5>] ? 
schedule+0x35/0x80
    May 31 14:05:16 caius kernel: [74723.170352]  [<ffffffff81223079>] 
SyS_ioctl+0x79/0x90
    May 31 14:05:16 caius kernel: [74723.170354]  [<ffffffff81840a32>] 
entry_SYSCALL_64_fastpath+0x16/0x71
    May 31 14:05:16 caius kernel: [74723.170362] ---[ end trace 
4186c97217dc5c88 ]---
    May 31 14:05:16 caius kernel: [74723.224341] [drm:drm_edid_block_valid 
[drm]] *ERROR* EDID checksum is invalid, remainder is 154
    May 31 14:05:16 caius kernel: [74723.224342] Raw EDID:
    May 31 14:05:16 caius kernel: [74723.224343]    00 ff ff ff ff ff ff 00 1e 
6d 91 57 01 01 01 01
    May 31 14:05:16 caius kernel: [74723.224344]    01 13 01 03 80 33 1d 78 ea 
c6 65 a0 59 59 58 9d
    May 31 14:05:16 caius kernel: [74723.224345]    27 0e 50 54 21 08 00 71 40 
81 40 81 80 b3 00 01
    May 31 14:05:16 caius kernel: [74723.224346]    01 01 01 01 01 01 01 02 3a 
80 18 71 38 2d 40 58
    May 31 14:05:16 caius kernel: [74723.224347]    2c 45 00 fe 22 11 00 00 1e 
00 00 00 fd 00 38 3d
    May 31 14:05:16 caius kernel: [74723.224348]    1e 53 0f 00 0a 20 20 20 20 
20 20 00 00 00 fc 00
    May 31 14:05:16 caius kernel: [74723.224349]    45 32 33 35 30 0a 20 20 20 
20 20 20 20 00 00 00
    May 31 14:05:16 caius kernel: [74723.224350]    ff 00 0a 20 20 20 20 20 20 
20 20 20 20 20 20 01

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https://bugs.launchpad.net/bugs/1694787

Title:
  Dell Precision 5520 crashing after connecting to ethernet

Status in linux package in Ubuntu:
  New

Bug description:
  I have a Dell Precision 5520 that came pre-installed with Ubuntu
  16.04.

  I use it at home on wireless exclusively. When I take it to work, I
  plug it into ethernet via the ethernet dongle. Without fail, almost an
  hour later, all networking stops working. I can ping neither domains
  not IPs, even on my local network. If I try to run `sudo service
  networking restart` or `sudo service network-manager restart` then
  Gnome-Shell hangs.

  If I switch to an Fn terminal, I can run some commands, but eventually
  all sudo commands there hang too. Holding down ctrl+alt+del says
  "ctrl+alt+del pressed 7 times in 2 seconds, rebooting immediately",
  but after 15 minutes, it still doesn't reboot, forcing me to do a hard
  reboot.

  Afterwards, the laptop works fine until the next day, when it all
  happens again.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-78-generic 4.4.0-78.99
  ProcVersionSignature: Ubuntu 4.4.0-78.99-generic 4.4.62
  Uname: Linux 4.4.0-78-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chris      2444 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Wed May 31 14:14:09 2017
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  InstallationDate: Installed on 2017-03-09 (82 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 
20160624-10:47
  MachineType: Dell Inc. Precision 5520
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-78-generic.efi.signed 
root=UUID=b3c434bc-85ba-4b42-a137-374a088e6c0f ro acpi_rev_override quiet 
splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-78-generic N/A
   linux-backports-modules-4.4.0-78-generic  N/A
   linux-firmware                            1.157.10
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/28/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.0.2
  dmi.board.name: 0GPNW9
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.0.2:bd12/28/2016:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn0GPNW9:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.name: Precision 5520
  dmi.sys.vendor: Dell Inc.

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