Bug 87100

Summary: [HSW MST] Warning...process_single_tx_qlock
Product: DRI Reporter: Daniel Martin <consume.noise>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED WORKSFORME QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: airlied, intel-gfx-bugs, ken, sickvolo
Version: DRI git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: HSW i915 features: display/DP MST
Attachments:
Description Flags
dmesg drm-intel-nightly 3.18.0-00343-gfc7bddc none

Description Daniel Martin 2014-12-08 14:12:55 UTC 
Created attachment 110565 [details]
dmesg drm-intel-nightly 3.18.0-00343-gfc7bddc

(The same setup as in bug #87099, but the monitor at the VGA port was unplugged, leading to a different backtrace. Opening a different bug, because closing one is more easy then untangling two.)

Hardware:
- Lenovo ThinkPad T440s + ThinkPad Pro Dock 40A1
- 1. monitor (Dell U2410 1920x1200) at DP of docking station
- 2. monitor (Dell U2413 1920x1200) at VGA of docking station

If I boot this setup with both monitor attached to the console and remove the monitor (unplug the connector) at the VGA, then I can reproduce the attached backtrace (not?) always.

This happens with v3.17.6, v3.18 and current drm-intel-nightly (fc7bddc drm-intel-nightly: 2014y-12m-08d-12h-45m-52s UTC integration manifest). The dmesg log has been captured with drm-intel-nightly.

[   32.989502] [drm:drm_dp_mst_wait_tx_reply] timedout msg send ffff88030a3e8000 2 1                                                                              
[   32.997033] [drm:drm_dp_dpcd_access] too many retries, giving up
[   33.004354] [drm:drm_dp_dpcd_access] too many retries, giving up 
[   33.011308] [drm:drm_dp_dpcd_access] too many retries, giving up
[   33.018235] [drm:drm_dp_dpcd_access] too many retries, giving up
[   33.025125] [drm:drm_dp_dpcd_access] too many retries, giving up
[   33.032064] [drm:drm_dp_dpcd_access] too many retries, giving up
[   33.033205] [drm:drm_dp_send_sideband_msg] failed to dpcd write 13 -5
[   33.034044] ------------[ cut here ]------------
[   33.034767] WARNING: CPU: 0 PID: 128 at drivers/gpu/drm/drm_dp_mst_topology.c:1259 process_single_tx_qlock+0x5ee/0x650 [drm_kms_helper]()
...
[   33.085617] ---[ end trace 2bb04b47e83116a7 ]---
[   33.086539] [drm:process_single_tx_qlock] sideband msg failed to send
[   33.087466] [drm:process_single_down_tx_qlock] failed to send msg in q -5
...
Comment 1 Daniel Martin 2015-01-27 10:22:16 UTC 
Just tested 3.19-rc6 and current drm-intel-nightly (2c2cd37 drm-intel-nightly: 2015y-01m-26d-09h-38m-30s UTC integration manifest), no changes according to this bug.

Is there any patch on the list - not yet in drm-intel-nightly - that might be worth a try?
Comment 2 Ander Conselvan de Oliveira 2015-06-17 07:35:26 UTC 
*** Bug 90943 has been marked as a duplicate of this bug. ***
Comment 3 Sic Volo 2015-09-01 21:01:53 UTC 
Having the same problem with
Comment 4 Sic Volo 2015-09-01 21:05:22 UTC 
I got a Startech MST Hub (DisplayPort to 3x DisplayPort) and getting the same kernel dump from a 4.1.2 kernel right after connecting it.
Comment 5 Leho Kraav (:macmaN :lkraav) 2015-09-13 16:52:02 UTC 
Kernel 4.1.5

On a DELL docking station, every once in a while, one of the outputs stays active even after disconnected. This is the output when nothing is actually connected - DP1-2 is a ghost.

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
   1920x1080     60.02*+
   1400x1050     59.98  
   1280x1024     60.02  
   1280x960      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
DP1-1 disconnected (normal left inverted right x axis y axis)
DP1-2 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +
   1600x900      59.98  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.08    60.00  
   800x600       75.00    60.32    56.25  
   848x480       60.00  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DP1-3 disconnected (normal left inverted right x axis y axis)


Kernel shoots this warning 6 times

sept  13 19:48:51 papaya kernel: ------------[ cut here ]------------
sept  13 19:48:51 papaya kernel: WARNING: CPU: 3 PID: 2849 at drivers/gpu/drm/drm_dp_mst_topology.c:1297 process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]()
sept  13 19:48:51 papaya kernel: fail
sept  13 19:48:51 papaya kernel: Modules linked in: xhci_pci xhci_hcd uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev snd_usb_audio snd_hwdep snd_usbmidi_lib snd_rawmidi snd_seq_device tun nfsv3 nfs_acl nfs lockd grace sunrpc squashfs ctr ccm bnep snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic arc4 iwlmvm mac80211 btusb btbcm btintel bluetooth iwlwifi crc16 dell_wmi sparse_keymap iTCO_wdt dell_laptop cfg80211 dcdbas i8k snd_hda_intel snd_hda_controller e1000e snd_hda_codec intel_rapl psmouse iosf_mbi rfkill x86_pkg_temp_thermal intel_powerclamp snd_hda_core coretemp thermal wmi snd_pcm snd_timer ptp mei_me lpc_ich pps_core snd i2c_i801 battery ac mfd_core processor dell_smo8800 xts crc32_pclmul i915 cfbfillrect cfbimgblt intel_gtt cfbcopyarea fbcon bitblit softcursor font
sept  13 19:48:51 papaya kernel:  drm_kms_helper ehci_pci ehci_hcd drm sdhci_pci sdhci mmc_core agpgart fb fbdev video button [last unloaded: xhci_hcd]
sept  13 19:48:51 papaya kernel: CPU: 3 PID: 2849 Comm: Xorg Tainted: G        W       4.1.5-gentoo+ #72
sept  13 19:48:51 papaya kernel: Hardware name: Dell Inc. Latitude E7440/0PC4X0, BIOS A15 05/19/2015
sept  13 19:48:51 papaya kernel:  0000000000000009 ffff8801ed8bf808 ffffffff814b7327 00000000000000eb
sept  13 19:48:51 papaya kernel:  ffff8801ed8bf858 ffff8801ed8bf848 ffffffff8103cb39 0000000000001000
sept  13 19:48:51 papaya kernel:  ffffffffa00e4915 ffff88020919f800 0000000000000008 000000000000000c
sept  13 19:48:51 papaya kernel: Call Trace:
sept  13 19:48:51 papaya kernel:  [<ffffffff814b7327>] dump_stack+0x4c/0x6e
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb39>] warn_slowpath_common+0x9c/0xb6
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] ? process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb94>] warn_slowpath_fmt+0x41/0x43
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa0172091>] ? hsw_write32+0xde/0x124 [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e49f2>] process_single_down_tx_qlock+0x65/0x131 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4b1e>] drm_dp_queue_down_tx+0x60/0x70 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e6071>] drm_dp_mst_i2c_xfer+0x109/0x1a7 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01ad622>] ? gmbus_xfer+0x4a7/0x522 [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0c8c>] __i2c_transfer+0x1b7/0x33b
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0e6b>] i2c_transfer+0x5b/0x80
sept  13 19:48:51 papaya kernel:  [<ffffffffa0091788>] drm_do_probe_ddc_edid+0xb0/0x10a [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00917fa>] drm_probe_ddc+0x18/0x1f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa009428d>] drm_get_edid+0x1f/0x33f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e61d8>] drm_dp_mst_get_edid+0x3f/0x61 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01a5870>] intel_dp_mst_get_modes+0x24/0x4c [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3180>] drm_helper_probe_single_connector_modes_merge_bits+0x1db/0x3bf [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3372>] drm_helper_probe_single_connector_modes+0xe/0x10 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008db45>] drm_mode_getconnector+0xe7/0x2e3 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff811e7b86>] ? __btrfs_buffered_write+0x43f/0x48c
sept  13 19:48:51 papaya kernel:  [<ffffffffa0082a78>] drm_ioctl+0x360/0x3d8 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008da5e>] ? drm_mode_getcrtc+0x117/0x117 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff81128e86>] do_vfs_ioctl+0x367/0x421
sept  13 19:48:51 papaya kernel:  [<ffffffff81119e34>] ? vfs_write+0x143/0x164
sept  13 19:48:51 papaya kernel:  [<ffffffff81128f79>] SyS_ioctl+0x39/0x61
sept  13 19:48:51 papaya kernel:  [<ffffffff814bbfd7>] system_call_fastpath+0x12/0x6a
sept  13 19:48:51 papaya kernel: ---[ end trace 114bbd103ef4df79 ]---
sept  13 19:48:51 papaya kernel: ------------[ cut here ]------------
sept  13 19:48:51 papaya kernel: WARNING: CPU: 3 PID: 2849 at drivers/gpu/drm/drm_dp_mst_topology.c:1297 process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]()
sept  13 19:48:51 papaya kernel: fail
sept  13 19:48:51 papaya kernel: Modules linked in: xhci_pci xhci_hcd uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev snd_usb_audio snd_hwdep snd_usbmidi_lib snd_rawmidi snd_seq_device tun nfsv3 nfs_acl nfs lockd grace sunrpc squashfs ctr ccm bnep snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic arc4 iwlmvm mac80211 btusb btbcm btintel bluetooth iwlwifi crc16 dell_wmi sparse_keymap iTCO_wdt dell_laptop cfg80211 dcdbas i8k snd_hda_intel snd_hda_controller e1000e snd_hda_codec intel_rapl psmouse iosf_mbi rfkill x86_pkg_temp_thermal intel_powerclamp snd_hda_core coretemp thermal wmi snd_pcm snd_timer ptp mei_me lpc_ich pps_core snd i2c_i801 battery ac mfd_core processor dell_smo8800 xts crc32_pclmul i915 cfbfillrect cfbimgblt intel_gtt cfbcopyarea fbcon bitblit softcursor font
sept  13 19:48:51 papaya kernel:  drm_kms_helper ehci_pci ehci_hcd drm sdhci_pci sdhci mmc_core agpgart fb fbdev video button [last unloaded: xhci_hcd]
sept  13 19:48:51 papaya kernel: CPU: 3 PID: 2849 Comm: Xorg Tainted: G        W       4.1.5-gentoo+ #72
sept  13 19:48:51 papaya kernel: Hardware name: Dell Inc. Latitude E7440/0PC4X0, BIOS A15 05/19/2015
sept  13 19:48:51 papaya kernel:  0000000000000009 ffff8801ed8bf808 ffffffff814b7327 000000000000000d
sept  13 19:48:51 papaya kernel:  ffff8801ed8bf858 ffff8801ed8bf848 ffffffff8103cb39 0000000000001000
sept  13 19:48:51 papaya kernel:  ffffffffa00e4915 ffff88020919f800 0000000000000008 000000000000000c
sept  13 19:48:51 papaya kernel: Call Trace:
sept  13 19:48:51 papaya kernel:  [<ffffffff814b7327>] dump_stack+0x4c/0x6e
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb39>] warn_slowpath_common+0x9c/0xb6
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] ? process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb94>] warn_slowpath_fmt+0x41/0x43
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e49f2>] process_single_down_tx_qlock+0x65/0x131 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4b1e>] drm_dp_queue_down_tx+0x60/0x70 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e6071>] drm_dp_mst_i2c_xfer+0x109/0x1a7 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01ad622>] ? gmbus_xfer+0x4a7/0x522 [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0c8c>] __i2c_transfer+0x1b7/0x33b
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0e6b>] i2c_transfer+0x5b/0x80
sept  13 19:48:51 papaya kernel:  [<ffffffffa0091788>] drm_do_probe_ddc_edid+0xb0/0x10a [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00917fa>] drm_probe_ddc+0x18/0x1f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa009428d>] drm_get_edid+0x1f/0x33f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e61d8>] drm_dp_mst_get_edid+0x3f/0x61 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01a5870>] intel_dp_mst_get_modes+0x24/0x4c [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3180>] drm_helper_probe_single_connector_modes_merge_bits+0x1db/0x3bf [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3372>] drm_helper_probe_single_connector_modes+0xe/0x10 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008db45>] drm_mode_getconnector+0xe7/0x2e3 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff811e7b86>] ? __btrfs_buffered_write+0x43f/0x48c
sept  13 19:48:51 papaya kernel:  [<ffffffffa0082a78>] drm_ioctl+0x360/0x3d8 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008da5e>] ? drm_mode_getcrtc+0x117/0x117 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff81128e86>] do_vfs_ioctl+0x367/0x421
sept  13 19:48:51 papaya kernel:  [<ffffffff81119e34>] ? vfs_write+0x143/0x164
sept  13 19:48:51 papaya kernel:  [<ffffffff81128f79>] SyS_ioctl+0x39/0x61
sept  13 19:48:51 papaya kernel:  [<ffffffff814bbfd7>] system_call_fastpath+0x12/0x6a
sept  13 19:48:51 papaya kernel: ---[ end trace 114bbd103ef4df7a ]---
sept  13 19:48:51 papaya kernel: ------------[ cut here ]------------
sept  13 19:48:51 papaya kernel: WARNING: CPU: 3 PID: 2849 at drivers/gpu/drm/drm_dp_mst_topology.c:1297 process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]()
sept  13 19:48:51 papaya kernel: fail
sept  13 19:48:51 papaya kernel: Modules linked in: xhci_pci xhci_hcd uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev snd_usb_audio snd_hwdep snd_usbmidi_lib snd_rawmidi snd_seq_device tun nfsv3 nfs_acl nfs lockd grace sunrpc squashfs ctr ccm bnep snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic arc4 iwlmvm mac80211 btusb btbcm btintel bluetooth iwlwifi crc16 dell_wmi sparse_keymap iTCO_wdt dell_laptop cfg80211 dcdbas i8k snd_hda_intel snd_hda_controller e1000e snd_hda_codec intel_rapl psmouse iosf_mbi rfkill x86_pkg_temp_thermal intel_powerclamp snd_hda_core coretemp thermal wmi snd_pcm snd_timer ptp mei_me lpc_ich pps_core snd i2c_i801 battery ac mfd_core processor dell_smo8800 xts crc32_pclmul i915 cfbfillrect cfbimgblt intel_gtt cfbcopyarea fbcon bitblit softcursor font
sept  13 19:48:51 papaya kernel:  drm_kms_helper ehci_pci ehci_hcd drm sdhci_pci sdhci mmc_core agpgart fb fbdev video button [last unloaded: xhci_hcd]
sept  13 19:48:51 papaya kernel: CPU: 3 PID: 2849 Comm: Xorg Tainted: G        W       4.1.5-gentoo+ #72
sept  13 19:48:51 papaya kernel: Hardware name: Dell Inc. Latitude E7440/0PC4X0, BIOS A15 05/19/2015
sept  13 19:48:51 papaya kernel:  0000000000000009 ffff8801ed8bf808 ffffffff814b7327 000000000000002d
sept  13 19:48:51 papaya kernel:  ffff8801ed8bf858 ffff8801ed8bf848 ffffffff8103cb39 0000000000001000
sept  13 19:48:51 papaya kernel:  ffffffffa00e4915 ffff88020919f800 0000000000000008 000000000000000c
sept  13 19:48:51 papaya kernel: Call Trace:
sept  13 19:48:51 papaya kernel:  [<ffffffff814b7327>] dump_stack+0x4c/0x6e
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb39>] warn_slowpath_common+0x9c/0xb6
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] ? process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb94>] warn_slowpath_fmt+0x41/0x43
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e49f2>] process_single_down_tx_qlock+0x65/0x131 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4b1e>] drm_dp_queue_down_tx+0x60/0x70 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e6071>] drm_dp_mst_i2c_xfer+0x109/0x1a7 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01ad622>] ? gmbus_xfer+0x4a7/0x522 [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0c8c>] __i2c_transfer+0x1b7/0x33b
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0e6b>] i2c_transfer+0x5b/0x80
sept  13 19:48:51 papaya kernel:  [<ffffffffa0091788>] drm_do_probe_ddc_edid+0xb0/0x10a [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00917fa>] drm_probe_ddc+0x18/0x1f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa009428d>] drm_get_edid+0x1f/0x33f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e61d8>] drm_dp_mst_get_edid+0x3f/0x61 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01a5870>] intel_dp_mst_get_modes+0x24/0x4c [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3180>] drm_helper_probe_single_connector_modes_merge_bits+0x1db/0x3bf [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3372>] drm_helper_probe_single_connector_modes+0xe/0x10 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008db45>] drm_mode_getconnector+0xe7/0x2e3 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff811e7b86>] ? __btrfs_buffered_write+0x43f/0x48c
sept  13 19:48:51 papaya kernel:  [<ffffffffa0082a78>] drm_ioctl+0x360/0x3d8 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008da5e>] ? drm_mode_getcrtc+0x117/0x117 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff81128e86>] do_vfs_ioctl+0x367/0x421
sept  13 19:48:51 papaya kernel:  [<ffffffff81119e34>] ? vfs_write+0x143/0x164
sept  13 19:48:51 papaya kernel:  [<ffffffff81128f79>] SyS_ioctl+0x39/0x61
sept  13 19:48:51 papaya kernel:  [<ffffffff814bbfd7>] system_call_fastpath+0x12/0x6a
sept  13 19:48:51 papaya kernel: ---[ end trace 114bbd103ef4df7b ]---
sept  13 19:48:51 papaya kernel: ------------[ cut here ]------------
sept  13 19:48:51 papaya kernel: WARNING: CPU: 3 PID: 2849 at drivers/gpu/drm/drm_dp_mst_topology.c:1297 process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]()
sept  13 19:48:51 papaya kernel: fail
sept  13 19:48:51 papaya kernel: Modules linked in: xhci_pci xhci_hcd uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev snd_usb_audio snd_hwdep snd_usbmidi_lib snd_rawmidi snd_seq_device tun nfsv3 nfs_acl nfs lockd grace sunrpc squashfs ctr ccm bnep snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic arc4 iwlmvm mac80211 btusb btbcm btintel bluetooth iwlwifi crc16 dell_wmi sparse_keymap iTCO_wdt dell_laptop cfg80211 dcdbas i8k snd_hda_intel snd_hda_controller e1000e snd_hda_codec intel_rapl psmouse iosf_mbi rfkill x86_pkg_temp_thermal intel_powerclamp snd_hda_core coretemp thermal wmi snd_pcm snd_timer ptp mei_me lpc_ich pps_core snd i2c_i801 battery ac mfd_core processor dell_smo8800 xts crc32_pclmul i915 cfbfillrect cfbimgblt intel_gtt cfbcopyarea fbcon bitblit softcursor font
sept  13 19:48:51 papaya kernel:  drm_kms_helper ehci_pci ehci_hcd drm sdhci_pci sdhci mmc_core agpgart fb fbdev video button [last unloaded: xhci_hcd]
sept  13 19:48:51 papaya kernel: CPU: 3 PID: 2849 Comm: Xorg Tainted: G        W       4.1.5-gentoo+ #72
sept  13 19:48:51 papaya kernel: Hardware name: Dell Inc. Latitude E7440/0PC4X0, BIOS A15 05/19/2015
sept  13 19:48:51 papaya kernel:  0000000000000009 ffff8801ed8bf808 ffffffff814b7327 000000000000004d
sept  13 19:48:51 papaya kernel:  ffff8801ed8bf858 ffff8801ed8bf848 ffffffff8103cb39 0000000000001000
sept  13 19:48:51 papaya kernel:  ffffffffa00e4915 ffff88020919f800 0000000000000008 000000000000000c
sept  13 19:48:51 papaya kernel: Call Trace:
sept  13 19:48:51 papaya kernel:  [<ffffffff814b7327>] dump_stack+0x4c/0x6e
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb39>] warn_slowpath_common+0x9c/0xb6
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] ? process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb94>] warn_slowpath_fmt+0x41/0x43
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e49f2>] process_single_down_tx_qlock+0x65/0x131 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4b1e>] drm_dp_queue_down_tx+0x60/0x70 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e6071>] drm_dp_mst_i2c_xfer+0x109/0x1a7 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01ad622>] ? gmbus_xfer+0x4a7/0x522 [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0c8c>] __i2c_transfer+0x1b7/0x33b
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0e6b>] i2c_transfer+0x5b/0x80
sept  13 19:48:51 papaya kernel:  [<ffffffffa0091788>] drm_do_probe_ddc_edid+0xb0/0x10a [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00917fa>] drm_probe_ddc+0x18/0x1f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa009428d>] drm_get_edid+0x1f/0x33f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e61d8>] drm_dp_mst_get_edid+0x3f/0x61 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01a5870>] intel_dp_mst_get_modes+0x24/0x4c [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3180>] drm_helper_probe_single_connector_modes_merge_bits+0x1db/0x3bf [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3372>] drm_helper_probe_single_connector_modes+0xe/0x10 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008db45>] drm_mode_getconnector+0xe7/0x2e3 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff811e7b86>] ? __btrfs_buffered_write+0x43f/0x48c
sept  13 19:48:51 papaya kernel:  [<ffffffffa0082a78>] drm_ioctl+0x360/0x3d8 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008da5e>] ? drm_mode_getcrtc+0x117/0x117 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff81128e86>] do_vfs_ioctl+0x367/0x421
sept  13 19:48:51 papaya kernel:  [<ffffffff81119e34>] ? vfs_write+0x143/0x164
sept  13 19:48:51 papaya kernel:  [<ffffffff81128f79>] SyS_ioctl+0x39/0x61
sept  13 19:48:51 papaya kernel:  [<ffffffff814bbfd7>] system_call_fastpath+0x12/0x6a
sept  13 19:48:51 papaya kernel: ---[ end trace 114bbd103ef4df7c ]---
sept  13 19:48:51 papaya kernel: ------------[ cut here ]------------
sept  13 19:48:51 papaya kernel: WARNING: CPU: 3 PID: 2849 at drivers/gpu/drm/drm_dp_mst_topology.c:1297 process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]()
sept  13 19:48:51 papaya kernel: fail
sept  13 19:48:51 papaya kernel: Modules linked in: xhci_pci xhci_hcd uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev snd_usb_audio snd_hwdep snd_usbmidi_lib snd_rawmidi snd_seq_device tun nfsv3 nfs_acl nfs lockd grace sunrpc squashfs ctr ccm bnep snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic arc4 iwlmvm mac80211 btusb btbcm btintel bluetooth iwlwifi crc16 dell_wmi sparse_keymap iTCO_wdt dell_laptop cfg80211 dcdbas i8k snd_hda_intel snd_hda_controller e1000e snd_hda_codec intel_rapl psmouse iosf_mbi rfkill x86_pkg_temp_thermal intel_powerclamp snd_hda_core coretemp thermal wmi snd_pcm snd_timer ptp mei_me lpc_ich pps_core snd i2c_i801 battery ac mfd_core processor dell_smo8800 xts crc32_pclmul i915 cfbfillrect cfbimgblt intel_gtt cfbcopyarea fbcon bitblit softcursor font
sept  13 19:48:51 papaya kernel:  drm_kms_helper ehci_pci ehci_hcd drm sdhci_pci sdhci mmc_core agpgart fb fbdev video button [last unloaded: xhci_hcd]
sept  13 19:48:51 papaya kernel: CPU: 3 PID: 2849 Comm: Xorg Tainted: G        W       4.1.5-gentoo+ #72
sept  13 19:48:51 papaya kernel: Hardware name: Dell Inc. Latitude E7440/0PC4X0, BIOS A15 05/19/2015
sept  13 19:48:51 papaya kernel:  0000000000000009 ffff8801ed8bf808 ffffffff814b7327 000000000000006d
sept  13 19:48:51 papaya kernel:  ffff8801ed8bf858 ffff8801ed8bf848 ffffffff8103cb39 0000000000001000
sept  13 19:48:51 papaya kernel:  ffffffffa00e4915 ffff88020919f800 0000000000000008 000000000000000c
sept  13 19:48:51 papaya kernel: Call Trace:
sept  13 19:48:51 papaya kernel:  [<ffffffff814b7327>] dump_stack+0x4c/0x6e
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb39>] warn_slowpath_common+0x9c/0xb6
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] ? process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffff8103cb94>] warn_slowpath_fmt+0x41/0x43
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4915>] process_single_tx_qlock+0x33c/0x3b4 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e49f2>] process_single_down_tx_qlock+0x65/0x131 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e4b1e>] drm_dp_queue_down_tx+0x60/0x70 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e6071>] drm_dp_mst_i2c_xfer+0x109/0x1a7 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01ad622>] ? gmbus_xfer+0x4a7/0x522 [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0c8c>] __i2c_transfer+0x1b7/0x33b
sept  13 19:48:51 papaya kernel:  [<ffffffff813b0e6b>] i2c_transfer+0x5b/0x80
sept  13 19:48:51 papaya kernel:  [<ffffffffa0091788>] drm_do_probe_ddc_edid+0xb0/0x10a [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00917fa>] drm_probe_ddc+0x18/0x1f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa009428d>] drm_get_edid+0x1f/0x33f [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e61d8>] drm_dp_mst_get_edid+0x3f/0x61 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa01a5870>] intel_dp_mst_get_modes+0x24/0x4c [i915]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3180>] drm_helper_probe_single_connector_modes_merge_bits+0x1db/0x3bf [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa00e3372>] drm_helper_probe_single_connector_modes+0xe/0x10 [drm_kms_helper]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008db45>] drm_mode_getconnector+0xe7/0x2e3 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff811e7b86>] ? __btrfs_buffered_write+0x43f/0x48c
sept  13 19:48:51 papaya kernel:  [<ffffffffa0082a78>] drm_ioctl+0x360/0x3d8 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffffa008da5e>] ? drm_mode_getcrtc+0x117/0x117 [drm]
sept  13 19:48:51 papaya kernel:  [<ffffffff81128e86>] do_vfs_ioctl+0x367/0x421
sept  13 19:48:51 papaya kernel:  [<ffffffff81119e34>] ? vfs_write+0x143/0x164
sept  13 19:48:51 papaya kernel:  [<ffffffff81128f79>] SyS_ioctl+0x39/0x61
sept  13 19:48:51 papaya kernel:  [<ffffffff814bbfd7>] system_call_fastpath+0x12/0x6a
sept  13 19:48:51 papaya kernel: ---[ end trace 114bbd103ef4df7d ]---
Comment 6 dog 2016-10-19 19:33:00 UTC 
It's been a year since this bug was updated and many changes have been made to the driver.  Is this still an issue?
Comment 7 Daniel Martin 2016-10-21 09:13:54 UTC 
I haven't seen this issue for a long time.
Comment 8 yann 2016-10-21 09:22:39 UTC 
(In reply to Daniel Martin from comment #7)
> I haven't seen this issue for a long time.

Thanks for your reply. Closing then as worksforme. Please reopen if it re-appears.

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