[Intel-gfx] [REGRESSION] i915 drm oopsing again on T440p docking station attached

[Nicolas Kalkhof]

Hi,
 
it looks like the same trouble I ran into using latest drm-intel-nightly git however my machine is still responsive via ssh. dmesg shows the following dump when connecting my lenovo t440p to the docking station (booting up undocked!):
 
[  126.517529] BUG: unable to handle kernel NULL pointer dereference at 0000000000000760
[  126.517557] IP: [<ffffffffa01dd9c5>] intel_ddi_init_dp_buf_reg+0x15/0x30 [i915]
[  126.517561] PGD 40b001067 PUD 40aca6067 PMD 0
[  126.517563] Oops: 0000 [#1] SMP
[  126.517580] Modules linked in: snd_hda_codec_hdmi iwlmvm snd_hda_codec_realtek snd_hda_codec_generic iwlwifi i915 i2c_algo_bit drm_kms_helper cfbfillrect syscopyarea cfbimgblt sysfillrect sysimgblt fb_sys_fops cfbcopyarea drm snd_hda_intel intel_gtt snd_hda_codec snd_hda_core agpgart snd_pcm snd_timer
[  126.517584] CPU: 0 PID: 1423 Comm: X Tainted: G        W       4.2.0-rc7+ #16
[  126.517586] Hardware name: LENOVO qqqqENX407/qqqqENX407, BIOS GLET79WW (2.33 ) 06/23/2015
[  126.517588] task: ffff88040b8d2040 ti: ffff88040a9a0000 task.ti: ffff88040a9a0000
[  126.517606] RIP: 0010:[<ffffffffa01dd9c5>]  [<ffffffffa01dd9c5>] intel_ddi_init_dp_buf_reg+0x15/0x30 [i915]
[  126.517608] RSP: 0018:ffff88040a9a3af0  EFLAGS: 00010286
[  126.517609] RAX: 0000000080000000 RBX: ffff88040b1d10d0 RCX: ffffffffa021ab8b
[  126.517611] RDX: 0000000000000000 RSI: 0000000000000246 RDI: ffff88040b1d1000
[  126.517612] RBP: ffff88040b783b00 R08: ffffffffa021ab79 R09: 000000000000001f
[  126.517613] R10: ffff88041e5536b8 R11: 00000000000aa958 R12: ffff88040c1f3000
[  126.517614] R13: ffff88040b430000 R14: ffff88040b1d1000 R15: ffff88040afb0800
[  126.517617] FS:  00007f35b75a18c0(0000) GS:ffff88041e200000(0000) knlGS:0000000000000000
[  126.517618] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  126.517620] CR2: 0000000000000760 CR3: 000000040b5be000 CR4: 00000000001406f0
[  126.517621] Stack:
[  126.517624]  ffffffffa01e0883 0000000000000292 00000002a01cc805 ffff88040b430000
[  126.517627]  ffffffffa01a4eb7 ffffffffa02177af ffff88040afb0b50 ffff88040b783b00
[  126.517630]  ffff88040afb0800 ffff88040b430000 ffff88040c1f3000 ffff88040b430000
[  126.517630] Call Trace:
[  126.517648]  [<ffffffffa01e0883>] ? intel_mst_pre_enable_dp+0x153/0x1e0 [i915]
[  126.517668]  [<ffffffffa01a4eb7>] ? hsw_write32+0x87/0xc0 [i915]
[  126.517688]  [<ffffffffa01c48cd>] ? haswell_crtc_enable+0x3fd/0xbb0 [i915]
[  126.517694]  [<ffffffff8150e319>] ? mutex_lock+0x9/0x30
[  126.517713]  [<ffffffffa01c081e>] ? intel_atomic_commit+0x35e/0x1230 [i915]
[  126.517721]  [<ffffffffa013bb4d>] ? drm_atomic_helper_set_config+0x1ad/0x410 [drm_kms_helper]
[  126.517734]  [<ffffffffa00d20a9>] ? drm_mode_set_config_internal+0x59/0xf0 [drm]
[  126.517747]  [<ffffffffa00d67bf>] ? drm_mode_setcrtc+0x17f/0x4d0 [drm]
[  126.517755]  [<ffffffffa00c9128>] ? drm_ioctl+0xf8/0x430 [drm]
[  126.517765]  [<ffffffffa00d6640>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
[  126.517772]  [<ffffffff810ed19e>] ? do_vfs_ioctl+0x2be/0x490
[  126.517776]  [<ffffffff8104654e>] ? recalc_sigpending+0xe/0x30
[  126.517778]  [<ffffffff81047068>] ? __set_task_blocked+0x28/0x70
[  126.517783]  [<ffffffff810ddfda>] ? vfs_write+0x14a/0x170
[  126.517786]  [<ffffffff81049010>] ? __set_current_blocked+0x30/0x50
[  126.517790]  [<ffffffff810ed3a6>] ? SyS_ioctl+0x36/0x70
[  126.517793]  [<ffffffff810491de>] ? SyS_rt_sigprocmask+0x7e/0xa0
[  126.517798]  [<ffffffff8150fcd7>] ? entry_SYSCALL_64_fastpath+0x12/0x6a
[  126.517825] Code: d4 22 a0 48 c7 c7 a0 e1 20 a0 31 c0 e8 c5 e7 ee ff eb a2 0f 1f 00 8b 87 cc 00 00 00 48 8b 57 40 0d 00 00 00 80 89 87 d8 00 00 00 <48> 8b 92 60 07 00 00 0f b6 92 a0 02 00 00 8d 54 12 fe 09 d0 89
[  126.517842] RIP  [<ffffffffa01dd9c5>] intel_ddi_init_dp_buf_reg+0x15/0x30 [i915]
[  126.517843]  RSP <ffff88040a9a3af0>
[  126.517844] CR2: 0000000000000760
[  126.540304] ---[ end trace c5d5508f871766d5 ]---

 
I've cranked up the drm debug level. See attached dmesg log for the whole dump!
 
Anyone else running into this?
 
Cheers
Nic
 

Gesendet: Samstag, 15. August 2015 um 09:30 Uhr
Von: dmummenschanz at web.de
An: intel-gfx at lists.freedesktop.org
Betreff: [Intel-gfx] [REGRESSION] i915 drm oopsing again on T440p docking station attached
Hello,

with the latest commit batch to drm-intel-nightly from friday night, my lenovo t440p again starts to oops as soon as I attach it to the docking station. this image http://imgur.com/mxtLaxW shows the oops trace.

Can someone with a T440/540 and docking station confirm this?

Regards
Dieter

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