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[Bug 1576764] Re: Kernel bug caused by XRandR / Video Drivers

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: frew <frioux@xxxxxxxxx>
Date: Thu, 16 Jun 2016 16:08:39 -0000
Reply-to: Bug 1576764 <1576764@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Ok, confirmed.  Just happened after switching to one of the TTYs:

Jun 16 09:03:35 zfp kernel: [205770.823411] nouveau 0000:02:00.0: DRM: resuming kernel object tree...
Jun 16 09:03:35 zfp kernel: [205770.823583] nouveau 0000:02:00.0: priv: HUB0: 10ecc0 ffffffff (1b70822c)
Jun 16 09:03:36 zfp kernel: [205770.931854] nouveau 0000:02:00.0: DRM: resuming client object trees...
Jun 16 09:03:36 zfp kernel: [205770.932031] BUG: unable to handle kernel NULL pointer dereference at 0000000000000250
Jun 16 09:03:36 zfp kernel: [205770.932035] IP: [<ffffffff816adc10>] __ww_mutex_lock+0x20/0xa0
Jun 16 09:03:36 zfp kernel: [205770.932037] PGD 0 
Jun 16 09:03:36 zfp kernel: [205770.932038] Oops: 0002 [#1] SMP
Jun 16 09:03:36 zfp kernel: [205770.932064] Modules linked in: iwlmvm iwlwifi uas usb_storage btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs libcrc32c crc32c_generic cpuid tun xt_nat xt_tcpudp ctr ccm ecryptfs veth rfcomm ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype xt_conntrack nf_nat nf_conntrack br_netfilter bridge stp llc fuse overlay xt_multiport iptable_filter ip_tables x_tables bnep arc4 x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass mac80211 serio_raw snd_hda_codec_hdmi sg snd_hda_codec_realtek snd_hda_codec_generic snd_usb_audio snd_usbmidi_lib uvcvideo snd_hda_intel cfg80211 snd_hda_codec lpc_ich snd_hda_core snd_hwdep videobuf2_vmalloc rtsx_pci_ms memstick thinkpad_acpi joydev nvram videobuf2_memops snd_seq_midi videobuf2_v4l2 snd_seq_midi_event input_leds snd_rawmidi videobuf2_core snd_pcm snd_seq videodev snd_seq_device snd_timer media mei_me mei ie31200_edac btusb btrtl btbcm btintel bluetooth snd edac_core shpchp battery soundcore ac mac_hid nfsd sch_fq_codel auth_rpcgss nfs_acl lockd grace sunrpc parport_pc ppdev lp parport autofs4 ext4 crc16 jbd2 mbcache algif_skcipher af_alg dm_crypt dm_mod sr_mod cdrom sd_mod hid_thingm led_class hid_generic hid_logitech_hidpp hid_logitech_dj usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul ahci glue_helper libahci ablk_helper cryptd libata nouveau i915 scsi_mod psmouse ehci_pci mxm_wmi ehci_hcd ttm i2c_algo_bit xhci_pci xhci_hcd rtsx_pci drm_kms_helper syscopyarea sysfillrect usbcore sysimgblt fb_sys_fops e1000e drm usb_common ptp intel_gtt pps_core agpgart thermal wmi fjes button video jitterentropy_rng drbg ansi_cprng [last unloaded: iwlwifi]
Jun 16 09:03:36 zfp kernel: [205770.932098] CPU: 3 PID: 1195 Comm: Xorg Tainted: G        W       4.7.0-040700rc2-generic #201606100641
Jun 16 09:03:36 zfp kernel: [205770.932099] Hardware name: LENOVO 20AN006LUS/20AN006LUS, BIOS GLET83WW (2.37 ) 03/31/2016
Jun 16 09:03:36 zfp kernel: [205770.932100] task: ffff8800351ac380 ti: ffff880426180000 task.ti: ffff880426180000
Jun 16 09:03:36 zfp kernel: [205770.932103] RIP: 0010:[<ffffffff816adc10>]  [<ffffffff816adc10>] __ww_mutex_lock+0x20/0xa0
Jun 16 09:03:36 zfp kernel: [205770.932103] RSP: 0018:ffff880426183908  EFLAGS: 00010246
Jun 16 09:03:36 zfp kernel: [205770.932104] RAX: 00000000ffffffff RBX: 0000000000000250 RCX: 0000000000000006
Jun 16 09:03:36 zfp kernel: [205770.932105] RDX: 0000000080000000 RSI: ffff8801cd7ac300 RDI: 0000000000000250
Jun 16 09:03:36 zfp kernel: [205770.932106] RBP: ffff880426183928 R08: 0000000000000438 R09: 0000000000000898
Jun 16 09:03:36 zfp kernel: [205770.932106] R10: 0000000000000780 R11: 0000000000000898 R12: ffff8801cd7ac300
Jun 16 09:03:36 zfp kernel: [205770.932107] R13: ffff88042448b800 R14: 0000000000000000 R15: ffff8804250d21c0
Jun 16 09:03:36 zfp kernel: [205770.932108] FS:  00007f5b5c7eba00(0000) GS:ffff88043e2c0000(0000) knlGS:0000000000000000
Jun 16 09:03:36 zfp kernel: [205770.932109] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 16 09:03:36 zfp kernel: [205770.932110] CR2: 0000000000000250 CR3: 00000004261e7000 CR4: 00000000001406e0
Jun 16 09:03:36 zfp kernel: [205770.932110] Stack:
Jun 16 09:03:36 zfp kernel: [205770.932112]  ffff8801cd7ac300 0000000000000250 ffff88042448b800 0000000000000000
Jun 16 09:03:36 zfp kernel: [205770.932113]  ffff880426183958 ffffffffc00a9a6e ffff880426183968 ffff8802dbaa4800
Jun 16 09:03:36 zfp kernel: [205770.932115]  ffff8802dbaa4800 ffff88042448b800 ffff880426183990 ffffffffc00aa584
Jun 16 09:03:36 zfp kernel: [205770.932115] Call Trace:
Jun 16 09:03:36 zfp kernel: [205770.932142]  [<ffffffffc00a9a6e>] drm_modeset_lock+0x4e/0xe0 [drm]
Jun 16 09:03:36 zfp kernel: [205770.932158]  [<ffffffffc00aa584>] drm_atomic_get_connector_state+0x34/0x1b0 [drm]
Jun 16 09:03:36 zfp kernel: [205770.932168]  [<ffffffffc01d9271>] __drm_atomic_helper_set_config+0x281/0x330 [drm_kms_helper]
Jun 16 09:03:36 zfp kernel: [205770.932175]  [<ffffffffc01da491>] restore_fbdev_mode+0x221/0x260 [drm_kms_helper]
Jun 16 09:03:36 zfp kernel: [205770.932190]  [<ffffffffc00a9b9a>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
Jun 16 09:03:36 zfp kernel: [205770.932197]  [<ffffffffc01dc983>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
Jun 16 09:03:36 zfp kernel: [205770.932204]  [<ffffffffc01dc9fd>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
Jun 16 09:03:36 zfp kernel: [205770.932235]  [<ffffffffc0358c0a>] intel_fbdev_set_par+0x1a/0x60 [i915]
Jun 16 09:03:36 zfp kernel: [205770.932238]  [<ffffffff813eb165>] ? fb_set_var+0x2f5/0x470
Jun 16 09:03:36 zfp kernel: [205770.932239]  [<ffffffff813eb0a6>] fb_set_var+0x236/0x470
Jun 16 09:03:36 zfp kernel: [205770.932243]  [<ffffffff810b6196>] ? update_curr+0x66/0x180
Jun 16 09:03:36 zfp kernel: [205770.932245]  [<ffffffff810b298c>] ? __enqueue_entity+0x6c/0x70
Jun 16 09:03:36 zfp kernel: [205770.932247]  [<ffffffff810b96e5>] ? enqueue_entity+0x2b5/0x920
Jun 16 09:03:36 zfp kernel: [205770.932250]  [<ffffffff813e139f>] fbcon_blank+0x30f/0x350
Jun 16 09:03:36 zfp kernel: [205770.932253]  [<ffffffff8102c97b>] ? __switch_to+0x4cb/0x5c0
Jun 16 09:03:36 zfp kernel: [205770.932255]  [<ffffffff8146f163>] do_unblank_screen+0xd3/0x1a0
Jun 16 09:03:36 zfp kernel: [205770.932257]  [<ffffffff81464899>] complete_change_console+0x59/0xe0
Jun 16 09:03:36 zfp kernel: [205770.932259]  [<ffffffff81465030>] vt_ioctl+0x710/0x12f0
Jun 16 09:03:36 zfp kernel: [205770.932261]  [<ffffffff814590df>] tty_ioctl+0x35f/0xc80
Jun 16 09:03:36 zfp kernel: [205770.932264]  [<ffffffff814c55c8>] ? __pm_runtime_suspend+0x68/0x80
Jun 16 09:03:36 zfp kernel: [205770.932267]  [<ffffffff81237de1>] do_vfs_ioctl+0xa1/0x5b0
Jun 16 09:03:36 zfp kernel: [205770.932270]  [<ffffffff8106ab65>] ? __do_page_fault+0x205/0x4d0
Jun 16 09:03:36 zfp kernel: [205770.932272]  [<ffffffff81238369>] SyS_ioctl+0x79/0x90
Jun 16 09:03:36 zfp kernel: [205770.932274]  [<ffffffff816b0176>] entry_SYSCALL_64_fastpath+0x1e/0xa8
Jun 16 09:03:36 zfp kernel: [205770.932289] Code: e9 4c ff ff ff e8 01 2b 9d ff 90 0f 1f 44 00 00 55 48 89 e5 41 56 41 55 41 54 53 49 89 f4 48 89 fb e8 55 e4 ff ff b8 ff ff ff ff <f0> 0f c1 03 83 e8 01 78 2b 41 83 44 24 10 01 4c 89 63 28 0f ae 
Jun 16 09:03:36 zfp kernel: [205770.932291] RIP  [<ffffffff816adc10>] __ww_mutex_lock+0x20/0xa0
Jun 16 09:03:36 zfp kernel: [205770.932291]  RSP <ffff880426183908>
Jun 16 09:03:36 zfp kernel: [205770.932292] CR2: 0000000000000250
Jun 16 09:03:36 zfp kernel: [205770.932293] ---[ end trace cd02b867c374a3be ]---

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https://bugs.launchpad.net/bugs/1576764

Title:
  Kernel bug caused by XRandR / Video Drivers

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Here are two stack traces showing the issue:

  
  Apr 29 08:33:05 zfp kernel: [34730.860474] general protection fault: 0000 [#1] SMP 
  Apr 29 08:33:05 zfp kernel: [34730.860507] Modules linked in: ctr ccm xt_nat xt_tcpudp ipt_REJECT nf_reject_ipv4 pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) rfcomm veth ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype xt_conntrack nf_nat nf_conntrack br_netfilter bridge stp llc overlay xt_multiport iptable_filter ip_tables x_tables bnep arc4 snd_usb_audio snd_usbmidi_lib uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media btusb btrtl btbcm btintel intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel bluetooth kvm irqbypass input_leds joydev serio_raw iwlmvm mac80211 snd_seq_midi snd_hda_codec_hdmi snd_hda_codec_realtek snd_seq_midi_event iwlwifi snd_hda_codec_generic thinkpad_acpi snd_rawmidi nvram cfg80211 rtsx_pci_ms snd_hda_intel memstick lpc_ich snd_hda_codec mei_me mei snd_hda_core snd_hwdep snd_pcm ie31200_edac snd_seq edac_core snd_seq_device snd_timer snd soundcore shpchp mac_hid sch_fq_codel nfsd auth_rpcgss nfs_acl lockd grace sunrpc parport_pc ppdev lp parport autofs4 drbg ansi_cprng algif_skcipher af_alg dm_crypt hid_thingm hid_generic hid_logitech_hidpp hid_logitech_dj usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd nouveau i915 psmouse ahci libahci mxm_wmi ttm rtsx_pci i2c_algo_bit drm_kms_helper e1000e syscopyarea sysfillrect sysimgblt fb_sys_fops drm ptp pps_core wmi fjes video
  Apr 29 08:33:05 zfp kernel: [34730.861171] CPU: 1 PID: 1523 Comm: Xorg Tainted: G           OE   4.4.0-21-generic #37-Ubuntu
  Apr 29 08:33:05 zfp kernel: [34730.861203] Hardware name: LENOVO 20AN006LUS/20AN006LUS, BIOS GLET77WW (2.31 ) 01/27/2015
  Apr 29 08:33:05 zfp kernel: [34730.861233] task: ffff8800a92b1b80 ti: ffff880428664000 task.ti: ffff880428664000
  Apr 29 08:33:05 zfp kernel: [34730.861261] RIP: 0010:[<ffffffffc01221cb>]  [<ffffffffc01221cb>] drm_dp_payload_send_msg+0x15b/0x210 [drm_kms_helper]
  Apr 29 08:33:05 zfp kernel: [34730.861308] RSP: 0018:ffff880428667ad8  EFLAGS: 00010282
  Apr 29 08:33:05 zfp kernel: [34730.861328] RAX: ffff8800a92b1b80 RBX: 0a26771717294f2d RCX: ffff880425e1d908
  Apr 29 08:33:05 zfp kernel: [34730.861354] RDX: 0000000080000000 RSI: 0a26771717294f2d RDI: ffff880425e1d908
  Apr 29 08:33:05 zfp kernel: [34730.861380] RBP: ffff880428667b28 R08: 000000000001a040 R09: ffffffffc012216b
  Apr 29 08:33:05 zfp kernel: [34730.861406] R10: ffffea000211bc00 R11: 0000000000000000 R12: ffff88042bf57810
  Apr 29 08:33:05 zfp kernel: [34730.861432] R13: ffff880425e1d650 R14: ffff880425e1d650 R15: ffff8804249e1800
  Apr 29 08:33:05 zfp kernel: [34730.861458] FS:  00007feb611c4a00(0000) GS:ffff88043e240000(0000) knlGS:0000000000000000
  Apr 29 08:33:05 zfp kernel: [34730.861488] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  Apr 29 08:33:05 zfp kernel: [34730.861509] CR2: 000055f2ae2e4b30 CR3: 00000004279e9000 CR4: 00000000001406e0
  Apr 29 08:33:05 zfp kernel: [34730.861534] Stack:
  Apr 29 08:33:05 zfp kernel: [34730.861543]  587ca201012a25ee ffff880425e1d908 ffff880428667b00 0000000000000001
  Apr 29 08:33:05 zfp kernel: [34730.861574]  000000003e400d66 0000000000000001 ffff88042bf57810 ffff880425e1d650
  Apr 29 08:33:05 zfp kernel: [34730.861605]  0000000000000001 ffff880425e1d9a0 ffff880428667b68 ffffffffc01227f2
  Apr 29 08:33:05 zfp kernel: [34730.861636] Call Trace:
  Apr 29 08:33:05 zfp kernel: [34730.861651]  [<ffffffffc01227f2>] drm_dp_update_payload_part2+0xc2/0x130 [drm_kms_helper]
  Apr 29 08:33:05 zfp kernel: [34730.861700]  [<ffffffffc0278cf7>] intel_mst_enable_dp+0xe7/0x110 [i915]
  Apr 29 08:33:05 zfp kernel: [34730.861739]  [<ffffffffc025bcd1>] haswell_crtc_enable+0x421/0x870 [i915]
  Apr 29 08:33:05 zfp kernel: [34730.861779]  [<ffffffffc02648d2>] ? intel_frontbuffer_flush+0x42/0x80 [i915]
  Apr 29 08:33:05 zfp kernel: [34730.861819]  [<ffffffffc0258b64>] intel_atomic_commit+0x454/0x6f0 [i915]
  Apr 29 08:33:05 zfp kernel: [34730.861857]  [<ffffffffc0064c47>] drm_atomic_commit+0x37/0x60 [drm]
  Apr 29 08:33:05 zfp kernel: [34730.861884]  [<ffffffffc0126a06>] drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
  Apr 29 08:33:05 zfp kernel: [34730.861922]  [<ffffffffc0053e02>] drm_mode_set_config_internal+0x62/0x100 [drm]
  Apr 29 08:33:05 zfp kernel: [34730.861958]  [<ffffffffc0058322>] drm_mode_setcrtc+0x3d2/0x4f0 [drm]
  Apr 29 08:33:05 zfp kernel: [34730.861988]  [<ffffffffc0049712>] drm_ioctl+0x152/0x540 [drm]
  Apr 29 08:33:05 zfp kernel: [34730.862017]  [<ffffffffc0057f50>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Apr 29 08:33:05 zfp kernel: [34730.862044]  [<ffffffff812200ff>] do_vfs_ioctl+0x29f/0x490
  Apr 29 08:33:05 zfp kernel: [34730.862066]  [<ffffffff8108e081>] ? __set_task_blocked+0x41/0xa0
  Apr 29 08:33:05 zfp kernel: [34730.862087]  [<ffffffff81090a16>] ? __set_current_blocked+0x36/0x60
  Apr 29 08:33:05 zfp kernel: [34730.862110]  [<ffffffff81220369>] SyS_ioctl+0x79/0x90
  Apr 29 08:33:05 zfp kernel: [34730.862130]  [<ffffffff81090cce>] ? SyS_rt_sigprocmask+0x8e/0xc0
  Apr 29 08:33:05 zfp kernel: [34730.862154]  [<ffffffff818244f2>] entry_SYSCALL_64_fastpath+0x16/0x71
  Apr 29 08:33:05 zfp kernel: [34730.862178] Code: e0 eb d1 49 8d 8e b8 02 00 00 49 8b 9f 30 04 00 00 48 89 cf 48 89 4d b8 e8 93 01 70 c1 49 83 be e8 02 00 00 00 48 8b 4d b8 74 6f <4c> 8b 63 28 4d 85 e4 74 66 49 3b 5c 24 20 74 46 49 8b 9c 24 30 
  Apr 29 08:33:05 zfp kernel: [34730.862314] RIP  [<ffffffffc01221cb>] drm_dp_payload_send_msg+0x15b/0x210 [drm_kms_helper]
  Apr 29 08:33:05 zfp kernel: [34730.862349]  RSP <ffff880428667ad8>
  Apr 29 08:33:05 zfp kernel: [34730.873457] ---[ end trace fe5e1f4d8234b524 ]---

  And yesterday:

  Apr 28 09:49:13 zfp kernel: [10746.972447] general protection fault: 0000 [#1] SMP 
  Apr 28 09:49:13 zfp kernel: [10746.972479] Modules linked in: ctr ccm xt_nat xt_tcpudp pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) rfcomm veth ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype xt_conntrack nf_nat nf_conntrack br_netfilter bridge stp llc overlay xt_multiport iptable_filter ip_tables x_tables bnep arc4 intel_rapl uvcvideo x86_pkg_temp_thermal intel_powerclamp coretemp videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 snd_usb_audio videobuf2_core kvm_intel v4l2_common videodev snd_usbmidi_lib kvm btusb media btrtl btbcm irqbypass btintel bluetooth input_leds joydev serio_raw iwlmvm snd_hda_codec_hdmi mac80211 snd_seq_midi snd_seq_midi_event snd_rawmidi snd_hda_codec_realtek snd_hda_codec_generic thinkpad_acpi snd_seq iwlwifi snd_hda_intel nvram snd_hda_codec cfg80211 snd_hda_core snd_hwdep rtsx_pci_ms lpc_ich snd_pcm memstick mei_me snd_seq_device mei snd_timer snd soundcore shpchp ie31200_edac edac_core mac_hid sch_fq_codel nfsd auth_rpcgss nfs_acl lockd parport_pc grace sunrpc ppdev lp parport autofs4 drbg ansi_cprng algif_skcipher af_alg dm_crypt hid_thingm hid_generic hid_logitech_hidpp hid_logitech_dj usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul nouveau aesni_intel i915 aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse mxm_wmi ttm i2c_algo_bit drm_kms_helper syscopyarea ahci sysfillrect sysimgblt libahci fb_sys_fops e1000e drm rtsx_pci ptp pps_core wmi fjes video
  Apr 28 09:49:13 zfp kernel: [10746.973274] CPU: 1 PID: 1525 Comm: Xorg Tainted: G           OE   4.4.0-21-generic #37-Ubuntu
  Apr 28 09:49:13 zfp kernel: [10746.973306] Hardware name: LENOVO 20AN006LUS/20AN006LUS, BIOS GLET77WW (2.31 ) 01/27/2015
  Apr 28 09:49:13 zfp kernel: [10746.973337] task: ffff880427583700 ti: ffff880422a98000 task.ti: ffff880422a98000
  Apr 28 09:49:13 zfp kernel: [10746.973364] RIP: 0010:[<ffffffffc01131cb>]  [<ffffffffc01131cb>] drm_dp_payload_send_msg+0x15b/0x210 [drm_kms_helper]
  Apr 28 09:49:13 zfp kernel: [10746.973411] RSP: 0018:ffff880422a9bad8  EFLAGS: 00010286
  Apr 28 09:49:13 zfp kernel: [10746.973431] RAX: ffff880427583700 RBX: 61642a0a2222203a RCX: ffff880425aaa908
  Apr 28 09:49:13 zfp kernel: [10746.973457] RDX: 0000000080000000 RSI: 61642a0a2222203a RDI: ffff880425aaa908
  Apr 28 09:49:13 zfp kernel: [10746.973483] RBP: ffff880422a9bb28 R08: 000000000001a040 R09: ffffffffc011316b
  Apr 28 09:49:13 zfp kernel: [10746.973509] R10: ffffea000cefd600 R11: 0000000000000000 R12: ffff8800356e0d10
  Apr 28 09:49:13 zfp kernel: [10746.973535] R13: ffff880425aaa650 R14: ffff880425aaa650 R15: ffff8804252ef800
  Apr 28 09:49:13 zfp kernel: [10746.973562] FS:  00007f3b44ea0a00(0000) GS:ffff88043e240000(0000) knlGS:0000000000000000
  Apr 28 09:49:13 zfp kernel: [10746.973591] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  Apr 28 09:49:13 zfp kernel: [10746.973612] CR2: 00007f1aef9db624 CR3: 0000000425d9e000 CR4: 00000000001406e0
  Apr 28 09:49:13 zfp kernel: [10746.973638] Stack:
  Apr 28 09:49:13 zfp kernel: [10746.973646]  6172542e616c736e ffff880425aaa908 ffff880422a9bb00 0000000000000001
  Apr 28 09:49:13 zfp kernel: [10746.973677]  000000008a528246 0000000000000001 ffff8800356e0d10 ffff880425aaa650
  Apr 28 09:49:13 zfp kernel: [10746.973708]  0000000000000001 ffff880425aaa9a0 ffff880422a9bb68 ffffffffc01137f2
  Apr 28 09:49:13 zfp kernel: [10746.973740] Call Trace:
  Apr 28 09:49:13 zfp kernel: [10746.973754]  [<ffffffffc01137f2>] drm_dp_update_payload_part2+0xc2/0x130 [drm_kms_helper]
  Apr 28 09:49:13 zfp kernel: [10746.973809]  [<ffffffffc02accf7>] intel_mst_enable_dp+0xe7/0x110 [i915]
  Apr 28 09:49:13 zfp kernel: [10746.973849]  [<ffffffffc028fcd1>] haswell_crtc_enable+0x421/0x870 [i915]
  Apr 28 09:49:13 zfp kernel: [10746.973889]  [<ffffffffc02988d2>] ? intel_frontbuffer_flush+0x42/0x80 [i915]
  Apr 28 09:49:13 zfp kernel: [10746.973929]  [<ffffffffc028cb64>] intel_atomic_commit+0x454/0x6f0 [i915]
  Apr 28 09:49:13 zfp kernel: [10746.973965]  [<ffffffffc0072c47>] drm_atomic_commit+0x37/0x60 [drm]
  Apr 28 09:49:13 zfp kernel: [10746.973993]  [<ffffffffc0117a06>] drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
  Apr 28 09:49:13 zfp kernel: [10746.974031]  [<ffffffffc0061e02>] drm_mode_set_config_internal+0x62/0x100 [drm]
  Apr 28 09:49:13 zfp kernel: [10746.974066]  [<ffffffffc0066322>] drm_mode_setcrtc+0x3d2/0x4f0 [drm]
  Apr 28 09:49:13 zfp kernel: [10746.974096]  [<ffffffffc0057712>] drm_ioctl+0x152/0x540 [drm]
  Apr 28 09:49:13 zfp kernel: [10746.974125]  [<ffffffffc0065f50>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Apr 28 09:49:13 zfp kernel: [10746.974152]  [<ffffffff812200ff>] do_vfs_ioctl+0x29f/0x490
  Apr 28 09:49:13 zfp kernel: [10746.974174]  [<ffffffff8108e081>] ? __set_task_blocked+0x41/0xa0
  Apr 28 09:49:13 zfp kernel: [10746.974197]  [<ffffffff81090a16>] ? __set_current_blocked+0x36/0x60
  Apr 28 09:49:13 zfp kernel: [10746.974220]  [<ffffffff81220369>] SyS_ioctl+0x79/0x90
  Apr 28 09:49:13 zfp kernel: [10746.974240]  [<ffffffff81090cce>] ? SyS_rt_sigprocmask+0x8e/0xc0
  Apr 28 09:49:13 zfp kernel: [10746.974264]  [<ffffffff818244f2>] entry_SYSCALL_64_fastpath+0x16/0x71
  Apr 28 09:49:13 zfp kernel: [10746.974287] Code: e0 eb d1 49 8d 8e b8 02 00 00 49 8b 9f 30 04 00 00 48 89 cf 48 89 4d b8 e8 93 f1 70 c1 49 83 be e8 02 00 00 00 48 8b 4d b8 74 6f <4c> 8b 63 28 4d 85 e4 74 66 49 3b 5c 24 20 74 46 49 8b 9c 24 30 
  Apr 28 09:49:13 zfp kernel: [10746.974423] RIP  [<ffffffffc01131cb>] drm_dp_payload_send_msg+0x15b/0x210 [drm_kms_helper]
  Apr 28 09:49:13 zfp kernel: [10746.974458]  RSP <ffff880422a9bad8>
  Apr 28 09:49:13 zfp kernel: [10746.983852] ---[ end trace c06b1063bbf77920 ]---

  
  The above happens when I run my "dock" script:

  #!/bin/dash
  xrandr --output DP2-1  --left-of eDP1 --off  \
         --output DP2-2 --right-of eDP1 --off
  xrandr --output DP2-1 --right-of eDP1 --auto
  xrandr --output DP2-2 --left-of  eDP1 --auto

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Fri Apr 29 08:42:30 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=729dd129-ad72-4d34-87d2-b698d6f581ae
  InstallationDate: Installed on 2015-06-16 (317 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: LENOVO 20AN006LUS
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-24 (4 days ago)
  dmi.bios.date: 01/27/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GLET77WW (2.31 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AN006LUS
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98401 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGLET77WW(2.31):bd01/27/2015:svnLENOVO:pn20AN006LUS:pvrThinkPadT440p:rvnLENOVO:rn20AN006LUS:rvr0B98401WIN:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AN006LUS
  dmi.product.version: ThinkPad T440p
  dmi.sys.vendor: LENOVO

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References

[Bug 1576764] [NEW] Kernel bug caused by XRandR / Video Drivers
From: frew, 2016-04-29