[Bug 89303] WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/i915/intel_display.c:9711 with 4.0-rc1

Thu Apr 30 15:25:53 PDT 2015

https://bugs.freedesktop.org/show_bug.cgi?id=89303

--- Comment #1 from tvanhala at gmail.com ---
I got what seems to be the same bug while running the 4.1-rc1 kernel with
Ubuntu 14.04. At least comparing the source files

https://github.com/torvalds/linux/blob/v4.1-rc1/drivers/gpu/drm/i915/intel_display.c
(line 10098)
https://github.com/torvalds/linux/blob/v4.0-rc1/drivers/gpu/drm/i915/intel_display.c
(line 9711)

it is exactly the same check that fails. The symptoms are that the screen gets
stuck with only the cursor moving. I was able to recover by CTRL+ALT+F1 and
restarting unity from the terminal. The problem occured while I was watching a
video on youtube. The machine is a Lenovo T420s with a sandy bridge CPU
(i5-2540M).

I updated to the 4.1-rc1 kernel from Ubuntu stock kernel 3.16.0-34 to check if
it fixes this bug:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1384342

I don't know if they have anything in common. At least both have to do with
page flips.

Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522245] ------------[ cut here
]------------
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522292] WARNING: CPU: 0 PID:
1670 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_display.c:10098
intel_check_page_flip+0xe6/0xf0 [i915]()
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522296] Kicking stuck page flip:
queued at 877877, now 889273
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522298] Modules linked in: ctr
ccm joydev serio_raw rfcomm bnep intel_rapl iosf_mbi x86_pkg_temp_thermal
intel_powerclamp snd_hda_codec_hdmi coretemp snd_hda_codec_conexant
snd_hda_codec_generic kvm i915 crct10dif_pclmul snd_hda_intel crc32_pclmul
ghash_clmulni_intel arc4 snd_hda_controller aesni_intel iwldvm aes_x86_64 lrw
mac80211 gf128mul snd_hda_codec glue_helper uvcvideo snd_hda_core ablk_helper
cryptd snd_hwdep snd_seq_midi btusb snd_seq_midi_event btbcm snd_pcm
videobuf2_vmalloc snd_rawmidi btintel thinkpad_acpi videobuf2_memops
drm_kms_helper iwlwifi videobuf2_core cdc_mbim snd_seq drm v4l2_common cdc_ncm
snd_seq_device videodev cfg80211 usbnet bluetooth snd_timer media mii nvram
cdc_acm cdc_wdm i2c_algo_bit lpc_ich mei_me snd parport_pc mei wmi soundcore
ppdev shpchp video lp mac_hid parport e1000e psmouse ahci sdhci_pci ptp libahci
sdhci pps_core
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522379] CPU: 0 PID: 1670 Comm:
dbus-daemon Not tainted 4.1.0-040100rc1-generic #201504270235
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522382] Hardware name: LENOVO
4174NEG/4174NEG, BIOS 8CET50WW (1.30 ) 11/01/2011
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522385]  0000000000002772
ffff88021e203d28 ffffffff817f9785 0000000000000007
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522389]  ffff88021e203d78
ffff88021e203d68 ffffffff8107d0a7 01000000000039fe
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522393]  ffff8802120e9000
ffff88021202b1a8 ffff88021202b000 0000000000000000
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522397] Call Trace:
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522400]  <IRQ> 
[<ffffffff817f9785>] dump_stack+0x45/0x57
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522411]  [<ffffffff8107d0a7>]
warn_slowpath_common+0x97/0xe0
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522415]  [<ffffffff8107d1a6>]
warn_slowpath_fmt+0x46/0x50
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522448]  [<ffffffffc0734206>]
intel_check_page_flip+0xe6/0xf0 [i915]
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522474]  [<ffffffffc06f7635>]
ilk_display_irq_handler+0xd5/0x230 [i915]
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522498]  [<ffffffffc06f9775>]
ironlake_irq_handler+0x275/0x2b0 [i915]
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522503]  [<ffffffff810d7ded>]
handle_irq_event_percpu+0x5d/0x1e0
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522509]  [<ffffffff810fb5c0>] ?
tick_nohz_stop_sched_tick+0x290/0x300
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522512]  [<ffffffff810d7fb8>]
handle_irq_event+0x48/0x70
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522516]  [<ffffffff810db21f>]
handle_edge_irq+0x7f/0x120
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522520]  [<ffffffff81018862>]
handle_irq+0x22/0x40
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522525]  [<ffffffff8180919c>]
do_IRQ+0x5c/0x110
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522529]  [<ffffffff8180702e>]
common_interrupt+0x6e/0x6e
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522531]  <EOI> 
Apr 30 22:33:08 tuomas-thinkpad kernel: [14842.522534] ---[ end trace
81dd908546d849c6 ]---

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