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[Benjamin Zeller <1580943@xxxxxxxxxxxxxxxxxx>]

Searching through my logs I found more oopses:

May  9 14:11:57 zbenjamin-laptop kernel: [116304.441199] BUG: unable to handle kernel NULL pointer dereference at           (null)
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441229] IP: [<ffffffff813ef54d>] __rb_erase_color+0xdd/0x260
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441251] PGD 0 
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441259] Oops: 0002 [#1] SMP 
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441269] Modules linked in: scsi_transport_iscsi btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c cpuid kvm_intel veth xt_CHECKSUM iptable_mangle xt_tcpudp ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack bridge stp llc iptable_filter ip_tables x_tables nvram msr drbg ansi_cprng ctr ccm rfcomm bnep binfmt_misc zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) cdc_mbim cdc_wdm cdc_ncm snd_usb_audio usbnet mii snd_usbmidi_lib uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common btusb videodev btrtl btbcm media btintel bluetooth hid_multitouch arc4 pn544_mei mei_phy pn544 hci nfc nls_iso8859_1 intel_rapl dell_wmi x86_pkg_temp_thermal sparse_keymap dell_laptop intel_powerclamp dcdbas coretemp kvm iwlmvm irqbypass mac80211 crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_hda_codec_realtek cryptd snd_hda_codec_generic snd_hda_codec_hdmi joydev input_leds serio_raw iwlwifi snd_hda_intel snd_hda_codec cfg80211 rtsx_pci_ms snd_seq_midi memstick lpc_ich snd_hda_core snd_seq_midi_event snd_hwdep snd_rawmidi mei_me snd_pcm mei snd_seq snd_seq_device snd_timer snd soundcore shpchp int3400_thermal processor_thermal_device intel_soc_dts_iosf acpi_als int3403_thermal int3402_thermal acpi_thermal_rel ie31200_edac kfifo_buf industrialio edac_core int340x_thermal_zone dell_smo8800 dell_rbtn mac_hid parport_pc ppdev lp parport autofs4 hid_generic usbhid hid nouveau rtsx_pci_sdmmc i915 mxm_wmi ttm i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt ahci fb_sys_fops psmouse libahci drm rtsx_pci video wmi fjes [last unloaded: kvm_intel]
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441788] CPU: 4 PID: 16447 Comm: device_wait_for Tainted: P     U     O    4.4.0-21-generic #37-Ubuntu
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441812] Hardware name: Dell Inc. XPS 15 9530/XPS 15 9530, BIOS A06 07/16/2014
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441831] task: ffff88013de92940 ti: ffff880210470000 task.ti: ffff880210470000
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441850] RIP: 0010:[<ffffffff813ef54d>]  [<ffffffff813ef54d>] __rb_erase_color+0xdd/0x260
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441873] RSP: 0018:ffff880210473ac8  EFLAGS: 00010282
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441887] RAX: ffff8801b2b9ae61 RBX: ffff8801b2b9ae60 RCX: 0000000000000000
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441905] RDX: 0000000000000000 RSI: ffff880308c3ccc0 RDI: ffff8801b2b9ae60
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441926] RBP: ffff880210473af0 R08: ffff8801b2b9ae60 R09: 000000018040003e
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441957] R10: ffff8800349bfec0 R11: ffff8800349bfee0 R12: ffff8802e36d9360
May  9 14:11:57 zbenjamin-laptop kernel: [116304.441989] R13: ffffffff811b8640 R14: ffff880308c3ccc0 R15: 0000000000000000
May  9 14:11:57 zbenjamin-laptop kernel: [116304.442020] FS:  0000000000000000(0000) GS:ffff88042fb00000(0000) knlGS:0000000000000000

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https://bugs.launchpad.net/bugs/1580943

Title:
  Kernel is very unstable on Dell XPS15 (model 2014)

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  The system is halted on my machine in different scenarios:

  1) Running debootstrap, the oops happens when chroot tries to mount a kernel filesystem from the host
  2) Running ubuntu-emulator create from the Ubuntu SDK IDE: http://pastebin.ubuntu.com/16373613/

  3) USB devices are disconnected sometimes, they are immediately
  reconnected but when a ubuntu phone is attached chances are high the
  system might hang as well

  I will attach more logs as soon as I hit the problem again

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-22-generic 4.4.0-22.39
  ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC3:  zbenjamin   3703 F.... pulseaudio
   /dev/snd/controlC2:  zbenjamin   3703 F.... pulseaudio
   /dev/snd/controlC1:  zbenjamin   3703 F.... pulseaudio
   /dev/snd/controlC0:  zbenjamin   3703 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu May 12 11:36:15 2016
  HibernationDevice: RESUME=UUID=ffa1bf0f-220e-4288-9b84-9970818474fc
  InstallationDate: Installed on 2016-03-15 (57 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
  MachineType: Dell Inc. XPS 15 9530
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=UUID=b09b103f-4a2d-4347-8844-6892dcb781ae ro i915.semaphores=0 i915.enable_rc6=0
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/16/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: XPS 15 9530
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A06
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA06:bd07/16/2014:svnDellInc.:pnXPS159530:pvrA06:rvnDellInc.:rnXPS159530:rvrA06:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: XPS 15 9530
  dmi.product.version: A06
  dmi.sys.vendor: Dell Inc.

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