Bug 98304

Summary: [BDW-U]Call Trace for drivers/gpu/drm/i915/intel_dp.c after do the system to idle test mode
Product: DRI Reporter: ye.tian <yex.tian>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED DUPLICATE QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs, yex.tian
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: BDW i915 features: display/DP
Attachments:
Description Flags
dmesg.log none

Description ye.tian 2016-10-18 07:41:52 UTC 
Created attachment 127374 [details]
dmesg.log

Description:
Only do the device test mode test, will find Call Trace in dmesg.
Other test mode or directly do echo freeze > /sys/power/state, will not have Call Trace in dmesg.
Dmesg log attached.

Failed kernel image:
mainline v4.8 and v4.9-rc1


Test Machine:
Platform: ThinkPad L450 Ultrabook
Product Name : 20DS0001GE
CPU: Intel® Core i5 5300-U @ 2.30 GHz (family: 6, model: 61 stepping: 4 )
Software
Linux kernel: v4.8 or v4.9-rc1 mainline
 from git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Linux distribution: Ubuntu 14.04.4 LTS 64 bits
BIOS: JDET46WW (1.08)
ME FW : 10.0.30.1072
Ksc (EC) : JDHT46WW (1.08)


Reproduce steps:
1. echo device > /sys/power/pm_test
2. echo freeze > /sys/power/state
3. wake up SUT from freeze, will find Call Trace in dmesg.


[   10.821968] ------------[ cut here ]------------
[   10.822013] WARNING: CPU: 0 PID: 6 at drivers/gpu/drm/i915/intel_dp.c:1062 intel_dp_aux_transfer+0x1db/0x220 [i915]
[   10.822020] WARN_ON(!msg->buffer != !msg->size)
[   10.822023] Modules linked in:
[   10.822028]  i915 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core snd_hda_codec_realtek videodev snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core drm_kms_helper snd_hwdep snd_pcm thinkpad_acpi nvram snd_seq_midi drm i2c_algo_bit snd_seq_midi_event rtsx_pci_ms memstick fb_sys_fops syscopyarea snd_rawmidi snd_seq snd_seq_device snd_timer intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp btusb btrtl joydev serio_raw btbcm kvm btintel mei_me bluetooth snd mei intel_pch_thermal irqbypass sysfillrect crct10dif_pclmul crc32_pclmul sysimgblt ghash_clmulni_intel soundcore cryptd wmi shpchp lpc_ich video mac_hid parport_pc ppdev lp parport rtsx_pci_sdmmc e1000e psmouse ptp rtsx_pci pps_core
[   10.822094] CPU: 0 PID: 6 Comm: kworker/u16:0 Not tainted 4.9.0-rc1-mainline-bat-v4.9-rc1-again+ #1
[   10.822100] Hardware name: LENOVO 20DSA060CD/Intel powered classmate PC, BIOS JDET50WW (1.12 ) 03/25/2015
[   10.822108] Workqueue: events_unbound async_run_entry_fn
[   10.822112]  ffffc9000067bac0 ffffffff813c180c ffffc9000067bb10 0000000000000000
[   10.822120]  ffffc9000067bb00 ffffffff8107d051 0000042626fa2940 ffffc9000067bbd0
[   10.822127]  ffff8801244e60e0 ffff8801244e6158 0000000000000003 0000000000000000
[   10.822134] Call Trace:
[   10.822141]  [<ffffffff813c180c>] dump_stack+0x63/0x87
[   10.822147]  [<ffffffff8107d051>] __warn+0xd1/0xf0
[   10.822152]  [<ffffffff8107d0bf>] warn_slowpath_fmt+0x4f/0x60
[   10.822187]  [<ffffffffa055a0fb>] ? intel_dp_aux_transfer+0xcb/0x220 [i915]
[   10.822216]  [<ffffffffa055a20b>] intel_dp_aux_transfer+0x1db/0x220 [i915]
[   10.822226]  [<ffffffffa0416b4d>] drm_dp_dpcd_access+0x5d/0xf0 [drm_kms_helper]
[   10.822235]  [<ffffffffa0416bfb>] drm_dp_dpcd_write+0x1b/0x20 [drm_kms_helper]
[   10.822263]  [<ffffffffa055512d>] intel_dp_start_link_train+0x2bd/0x4d0 [i915]
[   10.822291]  [<ffffffffa055668b>] intel_dp_check_link_status+0xbb/0xf0 [i915]
[   10.822314]  [<ffffffffa055aea0>] intel_dp_detect+0x700/0xb30 [i915]
[   10.822321]  [<ffffffff810b00dd>] ? select_task_rq_fair+0x18d/0x760
[   10.822329]  [<ffffffffa0417e55>] drm_helper_probe_single_connector_modes+0x3d5/0x4c0 [drm_kms_helper]
[   10.822336]  [<ffffffff810b33ce>] ? dequeue_entity+0x26e/0xa90
[   10.822345]  [<ffffffffa0423e9d>] drm_fb_helper_probe_connector_modes.isra.5+0x4d/0x70 [drm_kms_helper]
[   10.822355]  [<ffffffffa0425db3>] drm_fb_helper_initial_config+0x63/0x3b2 [drm_kms_helper]
[   10.822362]  [<ffffffff810adafe>] ? vtime_account_idle+0xe/0x50
[   10.822366]  [<ffffffff810adbd4>] ? vtime_common_task_switch+0x34/0x40
[   10.822394]  [<ffffffffa054cf78>] intel_fbdev_initial_config+0x18/0x30 [i915]
[   10.822399]  [<ffffffff8109fb17>] async_run_entry_fn+0x37/0x150
[   10.822403]  [<ffffffff81096713>] process_one_work+0x153/0x3f0
[   10.822407]  [<ffffffff81096edb>] worker_thread+0x12b/0x4b0
[   10.822412]  [<ffffffff81096db0>] ? rescuer_thread+0x350/0x350
[   10.822418]  [<ffffffff81520310>] ? dmar_enable_qi+0x50/0x140
[   10.822422]  [<ffffffff8109c6aa>] kthread+0xca/0xe0
[   10.822427]  [<ffffffff8109c5e0>] ? kthread_park+0x60/0x60
[   10.822433]  [<ffffffff8181a865>] ret_from_fork+0x25/0x30
[   10.822447] ---[ end trace b047f590bcbeb0d0 ]---
Comment 1 Jani Nikula 2016-10-18 09:30:53 UTC 
The warning was added by

commit dd788090822300a66ff469ae9e50f6d28d124eb8
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Thu Jul 28 17:55:04 2016 +0300

    drm/i915: Warn about aux msg buffer vs. size mismatch

but that's the messenger, not the scapegoat.
Comment 2 yann 2016-10-18 15:54:38 UTC 

*** This bug has been marked as a duplicate of bug 97344 ***

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