Bug#805763: gnome-shell freezes on logout

[Jaak Pruulmann-Vengerfeldt]

Hi,

I can confirm that the system freezes (on two unstables, both with
intel video, one with stock kernel and other with debian kernel +
patches for displayport mst audio). It can be recovered by restarting
gdm3 (some processes belonging to Debian-gdm will stay hanging) or
killing (frozen) gnome-shell of Debian-gdm.

There are some i915-related errors in journal (see attachment). Process
27222 was gnome-shell of Debian-gdm and 27214 its gnome-session. The
message about failing to enable device does not appear always. 

with best regards,
jaak pruulmann-vengerfeldt

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nov   22 09:51:35 komm gdm-password][27333]: pam_unix(gdm-password:session): session closed for user uku
nov   22 09:51:35 komm gnome-session[27214]: [dix] couldn't enable device 7
nov   22 09:51:50 komm kernel: ------------[ cut here ]------------
nov   22 09:51:50 komm kernel: WARNING: CPU: 1 PID: 27222 at /build/linux-CrHvZ_/linux-4.2.6/drivers/gpu/drm/i915/intel_display.c:136
nov   22 09:51:50 komm kernel: plane A assertion failure (expected on, current off)
nov   22 09:51:50 komm kernel: Modules linked in: rndis_wlan rndis_host cdc_ether usbnet mii ctr ccm fuse joydev hid_generic usbhid n
nov   22 09:51:50 komm kernel:  aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd i915 iwlwifi snd_soc_rt5640 snd_soc_rl6231 cfg
nov   22 09:51:50 komm kernel: CPU: 1 PID: 27222 Comm: gnome-shell Tainted: G        W  O    4.2.0-1-amd64 #1 Debian 4.2.6-1
nov   22 09:51:50 komm kernel: [142B blob data]
nov   22 09:51:50 komm kernel:  0000000000000000 ffffffffa079a260 ffffffff8154e2f6 ffff8800c54cbc48
nov   22 09:51:50 komm kernel:  ffffffff8106e5b1 ffff88040a590000 ffff880408914000 ffff88040a392800
nov   22 09:51:50 komm kernel:  ffff88040a392800 0000000000000003 ffffffff8106e62a ffffffffa079c3f8
nov   22 09:51:50 komm kernel: Call Trace:
nov   22 09:51:50 komm kernel:  [<ffffffff8154e2f6>] ? dump_stack+0x40/0x50
nov   22 09:51:50 komm kernel:  [<ffffffff8106e5b1>] ? warn_slowpath_common+0x81/0xb0
nov   22 09:51:50 komm kernel:  [<ffffffff8106e62a>] ? warn_slowpath_fmt+0x4a/0x50
nov   22 09:51:50 komm kernel:  [<ffffffffa073aac3>] ? hsw_disable_ips+0x43/0x170 [i915]
nov   22 09:51:50 komm kernel:  [<ffffffffa073acb9>] ? intel_crtc_disable_planes+0x39/0x100 [i915]
nov   22 09:51:50 komm kernel:  [<ffffffffa073cacc>] ? intel_crtc_control+0x3c/0xf0 [i915]
nov   22 09:51:50 komm kernel:  [<ffffffffa073cbde>] ? intel_crtc_update_dpms+0x5e/0x80 [i915]
nov   22 09:51:50 komm kernel:  [<ffffffffa0741e40>] ? intel_connector_dpms+0x50/0x60 [i915]
nov   22 09:51:50 komm kernel:  [<ffffffffa04bd4dd>] ? drm_mode_obj_set_property_ioctl+0x23d/0x250 [drm]
nov   22 09:51:50 komm kernel:  [<ffffffffa04ae0b2>] ? drm_ioctl+0x172/0x550 [drm]
nov   22 09:51:50 komm kernel:  [<ffffffff810a94ee>] ? __wake_up_common+0x4e/0x90
nov   22 09:51:50 komm kernel:  [<ffffffff811cfe30>] ? poll_select_copy_remaining+0x120/0x120
nov   22 09:51:50 komm kernel:  [<ffffffff811cf2c3>] ? do_vfs_ioctl+0x2c3/0x4a0
nov   22 09:51:50 komm kernel:  [<ffffffff811bc929>] ? vfs_read+0x109/0x120
nov   22 09:51:50 komm kernel:  [<ffffffff811cf516>] ? SyS_ioctl+0x76/0x90
nov   22 09:51:50 komm kernel:  [<ffffffff81553a32>] ? system_call_fast_compare_end+0xc/0x6b
nov   22 09:51:50 komm kernel: ---[ end trace 29aa158259ef4b8c ]---