CC intel-gfx.

on Sun, Oct 29, 2017 at 11:51:55PM +0100, Fengguang Wu wrote:
>Hi Linus,
>
>Up to now we see the below boot error/warnings when testing v4.14-rc6.
>
>They hit the RC release mainly due to various imperfections in 0day's
>auto bisection. So I manually list them here and CC the likely easy to
>debug ones to the corresponding maintainers in the followup emails.
>
>boot_successes: 4700
>boot_failures: 247

[...]

>WARNING:at_drivers/gpu/drm/drm_vblank.c:#drm_wait_one_vblank[drm]: 9

This is not easily bisectable, too:

[   15.084688] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   15.087918] ata3.00: ATAPI: PLDS DVD+/-RW DH-16AES, 3D11, max UDMA/100
[   15.088851] ata3.00: configured for UDMA/100
[   15.127041] vblank wait timed out on crtc 0
[   15.127071] ------------[ cut here ]------------
[   15.127096] WARNING: CPU: 3 PID: 109 at drivers/gpu/drm/drm_vblank.c:1066 drm_wait_one_vblank+0x18f/0x1a0 [drm]
[   15.127096] Modules linked in: snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul ahci crc32_pclmul libahci crc32c_intel ghash_clmulni_intel snd_hda_codec_realtek pcbc aesni_intel snd_hda_codec_generic crypto_simd glue_helper i915 snd_hda_intel dcdbas cryptd pcspkr libata snd_hda_codec shpchp drm_kms_helper snd_hda_core syscopyarea sysfillrect snd_hwdep sysimgblt fb_sys_fops snd_pcm snd_timer snd drm soundcore video ip_tables
[   15.127121] CPU: 3 PID: 109 Comm: kworker/u16:1 Not tainted 4.14.0-rc6 #1
[   15.127122] Hardware name: Dell Inc. OptiPlex 9020/0DNKMN, BIOS A05 12/05/2013
[   15.127126] Workqueue: events_unbound async_run_entry_fn
[   15.127127] task: ffff88021c904d00 task.stack: ffffc90001140000
[   15.127143] RIP: 0010:drm_wait_one_vblank+0x18f/0x1a0 [drm]
[   15.127145] RSP: 0018:ffffc90001143798 EFLAGS: 00010292
[   15.127146] RAX: 000000000000001f RBX: ffff88021bc18000 RCX: 0000000000000000
[   15.127147] RDX: 0000000000000001 RSI: 0000000000000002 RDI: 0000000000000286
[   15.127148] RBP: ffffc900011437f0 R08: 0000000000000000 R09: 000000000000001f
[   15.127149] R10: ffffc90001143798 R11: 000000000006e038 R12: 0000000000000000
[   15.127150] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000019
[   15.127152] FS:  0000000000000000(0000) GS:ffff88021eac0000(0000) knlGS:0000000000000000
[   15.127153] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.127155] CR2: 00005597ba168910 CR3: 000000021de09001 CR4: 00000000001606e0
[   15.127156] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   15.127157] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   15.127158] Call Trace:
[   15.127165]  ? remove_wait_queue+0x70/0x70
[   15.127235]  haswell_crtc_enable+0x6fd/0x810 [i915]
[   15.127291]  intel_update_crtc+0x4b/0xd0 [i915]
[   15.127344]  intel_update_crtcs+0x6b/0x80 [i915]
[   15.127396]  intel_atomic_commit_tail+0x2d7/0xf50 [i915]
[   15.127450]  intel_atomic_commit+0x18c/0x240 [i915]
[   15.127468]  drm_atomic_commit+0x4b/0x50 [drm]
[   15.127478]  restore_fbdev_mode_atomic+0x173/0x1c0 [drm_kms_helper]
[   15.127486]  restore_fbdev_mode+0x32/0x120 [drm_kms_helper]
[   15.127494]  drm_fb_helper_restore_fbdev_mode_unlocked+0x28/0x70 [drm_kms_helper]
[   15.127501]  drm_fb_helper_set_par+0x43/0x70 [drm_kms_helper]
[   15.127555]  intel_fbdev_set_par+0x1a/0x70 [i915]
[   15.127558]  fbcon_init+0x58f/0x610
[   15.127561]  visual_init+0xd6/0x130
[   15.127563]  do_bind_con_driver+0x1cb/0x3b0
[   15.127566]  do_take_over_console+0x115/0x170
[   15.127569]  do_fbcon_takeover+0x5c/0xb0
[   15.127571]  fbcon_event_notify+0x69d/0x7a0
[   15.127575]  notifier_call_chain+0x4a/0x70
[   15.127578]  __blocking_notifier_call_chain+0x47/0x60
[   15.127582]  blocking_notifier_call_chain+0x16/0x20
[   15.127584]  fb_notifier_call_chain+0x1b/0x20
[   15.127586]  register_framebuffer+0x207/0x340
[   15.127595]  __drm_fb_helper_initial_config_and_unlock+0x1f7/0x3d0 [drm_kms_helper]
[   15.127603]  drm_fb_helper_initial_config+0x35/0x40 [drm_kms_helper]
[   15.127657]  intel_fbdev_initial_config+0x18/0x50 [i915]
[   15.127659]  async_run_entry_fn+0x38/0x160
[   15.127661]  process_one_work+0x198/0x3e0
[   15.127663]  worker_thread+0x4e/0x3e0
[   15.127666]  kthread+0x114/0x150
[   15.127667]  ? process_one_work+0x3e0/0x3e0
[   15.127670]  ? kthread_create_on_node+0x40/0x40
[   15.127672]  ret_from_fork+0x25/0x30
[   15.127674] Code: c0 e9 29 ff ff ff 48 8b 7d a8 48 8d 75 b0 e8 59 86 01 e1 45 85 f6 0f 85 18 ff ff ff 44 89 e6 48 c7 c7 58 cb 0c a0 e8 c2 20 03 e1 <0f> ff e9 02 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 
[   15.127701] ---[ end trace 5cffa1ebb566b5f9 ]---
[   15.231040] vblank wait timed out on crtc 0

Thanks,
Fengguang