https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4839/shard-snb3/igt@kms_frontbuffer_tracking@fbc-1p-indfb-fliptrack.html

<3> [73.598487] [drm:fw_domains_get [i915]] *ERROR* render: timed out waiting for forcewake ack request.
<7> [73.604654] [drm:intel_gpu_reset [i915]] rcs0: timed out on STOP_RING
<7> [73.605724] [drm:intel_gpu_reset [i915]] bcs0: timed out on STOP_RING
<7> [73.606793] [drm:intel_gpu_reset [i915]] vcs0: timed out on STOP_RING
<7> [73.610927] [drm:intel_gpu_reset [i915]] rcs0: timed out on STOP_RING
<7> [73.611995] [drm:intel_gpu_reset [i915]] bcs0: timed out on STOP_RING
<7> [73.613063] [drm:intel_gpu_reset [i915]] vcs0: timed out on STOP_RING
<3> [74.673405] [drm:stop_ring [i915]] *ERROR* rcs0 : timed out trying to stop ring
<4> [74.733673] ------------[ cut here ]------------
<4> [74.733678] WARN_ON((dev_priv->uncore.funcs.mmio_readl(dev_priv, (((const i915_reg_t){ .reg = (((engine)->mmio_base) + 0x9c) })), true) & (1 << 9)) == 0)
<4> [74.733770] WARNING: CPU: 7 PID: 1107 at drivers/gpu/drm/i915/intel_ringbuffer.c:414 init_ring_common+0x8fd/0x9f0 [i915]
<4> [74.733773] Modules linked in: vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic i915 x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core broadcom bcm_phy_lib tg3 snd_pcm lpc_ich mei_me mei prime_numbers
<4> [74.733850] CPU: 7 PID: 1107 Comm: kms_frontbuffer Tainted: G     U  W         4.19.0-rc4-CI-CI_DRM_4839+ #1
<4> [74.733854] Hardware name: Dell Inc. XPS 8300  /0Y2MRG, BIOS A03 02/15/2011
<4> [74.733918] RIP: 0010:init_ring_common+0x8fd/0x9f0 [i915]
<4> [74.733923] Code: c7 18 57 1f a0 e8 23 d7 f6 e0 0f 0b 41 be 80 41 00 00 e9 d0 f9 ff ff 48 c7 c6 00 6c 2f a0 48 c7 c7 22 87 2d a0 e8 a3 f2 e8 e0 <0f> 0b e9 ea fc ff ff 48 c7 c1 44 87 2d a0 ba cc 00 00 00 48 c7 c6
<4> [74.733927] RSP: 0018:ffffc900002fba90 EFLAGS: 00010282
<4> [74.733934] RAX: 0000000000000000 RBX: ffff88020e400000 RCX: 0000000000000001
<4> [74.733938] RDX: 0000000080000001 RSI: ffffffff820c2be6 RDI: 00000000ffffffff
<4> [74.733942] RBP: ffff88020e5ca158 R08: 00000000aeb03f05 R09: 0000000000000000
<4> [74.733945] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88020e400000
<4> [74.733949] R13: ffff88020a499e68 R14: 00000000000020c0 R15: 0000000000000000
<4> [74.733954] FS:  00007f6eabb83980(0000) GS:ffff880227bc0000(0000) knlGS:0000000000000000
<4> [74.733958] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [74.733962] CR2: 0000559b614bb110 CR3: 000000021b7a4005 CR4: 00000000000606e0
<4> [74.733965] Call Trace:
<4> [74.734036]  init_render_ring+0xf/0x170 [i915]
<4> [74.734097]  i915_gem_init_hw+0x26e/0x300 [i915]
<4> [74.734148]  i915_reset+0x227/0x280 [i915]
<4> [74.734198]  i915_reset_device+0x1fb/0x290 [i915]
<4> [74.734252]  ? __intel_get_crtc_scanline+0x1c0/0x1c0 [i915]
<4> [74.734266]  ? work_on_cpu_safe+0x50/0x50
<4> [74.734324]  i915_handle_error+0x219/0x350 [i915]
<4> [74.734389]  ? reset_all_global_seqno.part.5+0x3c/0x260 [i915]
<4> [74.734395]  ? mark_held_locks+0x50/0x80
<4> [74.734449]  ? i915_drop_caches_set+0x16e/0x260 [i915]
<4> [74.734458]  ? _raw_spin_unlock_irqrestore+0x39/0x60
<4> [74.734468]  ? __mutex_unlock_slowpath+0x46/0x2b0
<4> [74.734524]  i915_drop_caches_set+0x1c6/0x260 [i915]
<4> [74.734535]  simple_attr_write+0xb0/0xd0
<4> [74.734546]  full_proxy_write+0x51/0x80
<4> [74.734557]  __vfs_write+0x31/0x180
<4> [74.734564]  ? rcu_lockdep_current_cpu_online+0x8f/0xd0
<4> [74.734572]  ? rcu_read_lock_sched_held+0x6f/0x80
<4> [74.734578]  ? rcu_sync_lockdep_assert+0x29/0x50
<4> [74.734585]  ? __sb_start_write+0x152/0x1f0
<4> [74.734590]  ? __sb_start_write+0x168/0x1f0
<4> [74.734600]  vfs_write+0xbd/0x1b0
<4> [74.734609]  ksys_write+0x50/0xc0
<4> [74.734620]  do_syscall_64+0x55/0x190
<4> [74.734627]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [74.734632] RIP: 0033:0x7f6eab0e2281
<4> [74.734636] Code: c3 0f 1f 84 00 00 00 00 00 48 8b 05 59 8d 20 00 c3 0f 1f 84 00 00 00 00 00 8b 05 8a d1 20 00 85 c0 75 16 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 57 f3 c3 0f 1f 44 00 00 41 54 55 49 89 d4 53
<4> [74.734640] RSP: 002b:00007fff75866a08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
<4> [74.734648] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f6eab0e2281
<4> [74.734651] RDX: 0000000000000005 RSI: 00007fff75866a90 RDI: 0000000000000008
<4> [74.734655] RBP: 00007fff75866a30 R08: 0000000000000000 R09: 0000000000000000
<4> [74.734659] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6eab0cb718
<4> [74.734663] R13: 0000000000000003 R14: 00007f6eab0d0628 R15: 00007f6eab0ccd80
<4> [74.734681] irq event stamp: 228524
<4> [74.734688] hardirqs last  enabled at (228523): [<ffffffff810f81ca>] console_unlock+0x3fa/0x5f0
<4> [74.734693] hardirqs last disabled at (228524): [<ffffffff81001910>] trace_hardirqs_off_thunk+0x1a/0x1c
<4> [74.734699] softirqs last  enabled at (228506): [<ffffffff81c0031d>] __do_softirq+0x31d/0x483
<4> [74.734706] softirqs last disabled at (228499): [<ffffffff8108c4c9>] irq_exit+0xa9/0xc0
<4> [74.734767] WARNING: CPU: 7 PID: 1107 at drivers/gpu/drm/i915/intel_ringbuffer.c:414 init_ring_common+0x8fd/0x9f0 [i915]
<4> [74.734771] ---[ end trace f194e422a76b98df ]---
<3> [74.845393] [drm:init_ring_common [i915]] *ERROR* rcs0 initialization failed ctl 00000000 (valid? 0) head 00000000 [00004490] tail 00000000 [00004490] start 00000000 [expected 00001000]
<3> [74.845581] [drm:i915_gem_init_hw [i915]] *ERROR* Failed to restart rcs0 (-5)
<3> [74.845671] [drm:i915_reset [i915]] *ERROR* Failed to initialise HW following reset (-5)