WARNING: CPU: 3 PID: 0 at drivers/gpu/drm/i915/intel_display.c:11098 intel_check_page_flip+0xb2/0xfb()

[Fabio Coatti]

Hi All,
With freshly compiled 4.2.1, I get the following kernel warning:

[mer set 23 09:22:27 2015] ------------[ cut here ]------------ 
[mer set 23 09:22:27 2015] WARNING: CPU: 3 PID: 0 at 
drivers/gpu/drm/i915/intel_display.c:11098 intel_check_page_flip+0xb2/0xfb() 
[mer set 23 09:22:27 2015] Kicking stuck page flip: queued at 1926, now 1930 
[mer set 23 09:22:27 2015] Modules linked in: joydev bnep algif_skcipher btusb 
btrtl btbcm btintel bluetooth uvcvideo videobuf2_vmalloc videobuf2_memops 
videobuf2_core v4l2_common
cdc_wdm videodev cdc_acm hp_wmi sparse_keymap intel_rapl iosf_mbi 
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi 
kvm snd_hda_codec_generic crct10dif_
pclmul crc32_pclmul iwldvm snd_hda_intel psmouse snd_hda_codec snd_hwdep 
snd_hda_core iwlwifi snd_pcm snd_timer snd soundcore wmi hp_accel lis3lv02d 
hp_wireless sch_fq_codel vboxn
etadp(O) vboxnetflt(O) vboxdrv(O) dm_zero dm_persistent_data dm_service_time 
dm_round_robin dm_queue_length dm_multipath dm_delay virtio_pci virtio_blk 
virtio_balloon virtio_ring 
virtio fuse overlay linear raid0 dm_raid dm_snapshot dm_bufio dm_mirror 
dm_region_hash dm_log hid_apple ohci_pci 
[mer set 23 09:22:27 2015]  ohci_hcd uhci_hcd 
[mer set 23 09:22:27 2015] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G        W  
O    4.2.1 #1 
[mer set 23 09:22:27 2015] Hardware name: Hewlett-Packard HP EliteBook Folio 
9470m/18DF, BIOS 68IBD Ver. F.40 02/01/2013 
[mer set 23 09:22:27 2015]  0000000000000000 0000000000000009 ffffffff818f9bb5 
ffff88023eac3de8 
[mer set 23 09:22:27 2015]  ffffffff810c4468 ffff8802320c7000 ffffffff815b7a46 
0000000000000046 
[mer set 23 09:22:27 2015]  ffff8800b281d000 ffff8801f50f4d80 ffff880234c7c000 
ffff8800b281d1a8 
[mer set 23 09:22:27 2015] Call Trace: 
[mer set 23 09:22:27 2015]  <IRQ>  [<ffffffff818f9bb5>] ? dump_stack+0x47/0x67 
[mer set 23 09:22:27 2015]  [<ffffffff810c4468>] ? 
warn_slowpath_common+0x9d/0xb5 
[mer set 23 09:22:27 2015]  [<ffffffff815b7a46>] ? 
intel_check_page_flip+0xb2/0xfb 
[mer set 23 09:22:27 2015]  [<ffffffff810c44ca>] ? warn_slowpath_fmt+0x4a/0x4f 
[mer set 23 09:22:27 2015]  [<ffffffff815a64fb>] ? 
__intel_pageflip_stall_check+0xb2/0xdc 
[mer set 23 09:22:27 2015]  [<ffffffff815b7a46>] ? 
intel_check_page_flip+0xb2/0xfb 
[mer set 23 09:22:27 2015]  [<ffffffff8158b4a0>] ? 
ironlake_irq_handler+0x382/0x919 
[mer set 23 09:22:27 2015]  [<ffffffff81102ee8>] ? 
handle_irq_event_percpu+0x3e/0x190 
[mer set 23 09:22:27 2015]  [<ffffffff81103079>] ? handle_irq_event+0x3f/0x62 
[mer set 23 09:22:27 2015]  [<ffffffff8110597b>] ? handle_edge_irq+0xd4/0xf3 
[mer set 23 09:22:27 2015]  [<ffffffff81004baa>] ? handle_irq+0x1f/0x23 
[mer set 23 09:22:27 2015]  [<ffffffff819030c5>] ? do_IRQ+0x45/0xc4 
[mer set 23 09:22:27 2015]  [<ffffffff81901568>] ? common_interrupt+0x68/0x68 
[mer set 23 09:22:27 2015]  <EOI>  [<ffffffff811198fd>] ? 
clockevents_program_event+0xd2/0xee 
[mer set 23 09:22:27 2015]  [<ffffffff8172c01d>] ? 
cpuidle_enter_state+0x129/0x1fe 
[mer set 23 09:22:27 2015]  [<ffffffff8172bfe2>] ? 
cpuidle_enter_state+0xee/0x1fe 
[mer set 23 09:22:27 2015]  [<ffffffff810f20cd>] ? 
cpu_startup_entry+0x1f9/0x2e0 
[mer set 23 09:22:27 2015]  [<ffffffff8102896e>] ? start_secondary+0x14f/0x167 
[mer set 23 09:22:27 2015] ---[ end trace 58065659e5553827 ]---

IIRC, this does not happens with previous kernel (4.2.0)

Of course I'm available for any information or test, but please CC: me as I'm 
not subscribed to lkml.

Many thanks!

-- 
Fabio
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