https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5069/shard-snb3/igt@kms_frontbuffer_tracking@fbc-modesetfrombusy.html

<3> [95.585477] [drm:stop_ring [i915]] *ERROR* rcs0 : timed out trying to stop ring
<4> [95.645698] ------------[ cut here ]------------
<4> [95.645703] WARN_ON((dev_priv->uncore.funcs.mmio_readl(dev_priv, (((const i915_reg_t){ .reg = (((engine)->mmio_base) + 0x9c) })), true) & (1 << 9)) == 0)
<4> [95.645795] WARNING: CPU: 3 PID: 2130 at drivers/gpu/drm/i915/intel_ringbuffer.c:414 init_ring_common+0x8fd/0x9f0 [i915]
<4> [95.645798] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic i915 x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul broadcom snd_hda_intel bcm_phy_lib ghash_clmulni_intel snd_hda_codec tg3 snd_hwdep snd_hda_core snd_pcm mei_me lpc_ich mei prime_numbers
<4> [95.645872] CPU: 3 PID: 2130 Comm: kms_frontbuffer Tainted: G     U  W         4.19.0-CI-CI_DRM_5069+ #1
<4> [95.645876] Hardware name: Dell Inc. XPS 8300  /0Y2MRG, BIOS A03 02/15/2011
<4> [95.645942] RIP: 0010:init_ring_common+0x8fd/0x9f0 [i915]
<4> [95.645947] Code: c7 38 22 1e a0 e8 23 0e f8 e0 0f 0b 41 be 80 41 00 00 e9 d0 f9 ff ff 48 c7 c6 88 5c 2e a0 48 c7 c7 21 72 2c a0 e8 83 28 ea e0 <0f> 0b e9 ea fc ff ff 48 c7 c1 43 72 2c a0 ba cc 00 00 00 48 c7 c6
<4> [95.645950] RSP: 0018:ffffc90000377a90 EFLAGS: 00010282
<4> [95.645957] RAX: 0000000000000000 RBX: ffff880217c90000 RCX: 0000000000000000
<4> [95.645961] RDX: 0000000000000007 RSI: ffffffff820c318e RDI: 00000000ffffffff
<4> [95.645965] RBP: ffff88021c9642a8 R08: 00000000505aa8af R09: 0000000000000000
<4> [95.645969] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880217c90000
<4> [95.645973] R13: ffff88021c92abe8 R14: 00000000000020c0 R15: 0000000000000000
<4> [95.645977] FS:  00007fee90d2e980(0000) GS:ffff880227ac0000(0000) knlGS:0000000000000000
<4> [95.645981] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [95.645985] CR2: 0000557a1415a110 CR3: 000000021d7a2006 CR4: 00000000000606e0
<4> [95.645988] Call Trace:
<4> [95.646001]  ? _raw_spin_unlock_irqrestore+0x4e/0x60
<4> [95.646069]  init_render_ring+0xf/0x170 [i915]
<4> [95.646132]  i915_gem_init_hw+0x214/0x260 [i915]
<4> [95.646184]  i915_reset+0x227/0x280 [i915]
<4> [95.646235]  i915_reset_device+0x1fb/0x290 [i915]
<4> [95.646290]  ? __intel_get_crtc_scanline+0x1c0/0x1c0 [i915]
<4> [95.646302]  ? work_on_cpu_safe+0x50/0x50
<4> [95.646362]  i915_handle_error+0x219/0x350 [i915]
<4> [95.646373]  ? mark_held_locks+0x50/0x80
<4> [95.646380]  ? _raw_spin_unlock_irqrestore+0x4c/0x60
<4> [95.646436]  ? i915_drop_caches_set+0x14c/0x270 [i915]
<4> [95.646449]  ? __mutex_unlock_slowpath+0x46/0x2b0
<4> [95.646507]  i915_drop_caches_set+0x1a0/0x270 [i915]
<4> [95.646518]  simple_attr_write+0xb0/0xd0
<4> [95.646529]  full_proxy_write+0x51/0x80
<4> [95.646540]  __vfs_write+0x31/0x180
<4> [95.646547]  ? rcu_lockdep_current_cpu_online+0x8f/0xd0
<4> [95.646555]  ? rcu_read_lock_sched_held+0x6f/0x80
<4> [95.646561]  ? rcu_sync_lockdep_assert+0x29/0x50
<4> [95.646567]  ? __sb_start_write+0x152/0x1f0
<4> [95.646573]  ? __sb_start_write+0x163/0x1f0
<4> [95.646582]  vfs_write+0xbd/0x1b0
<4> [95.646591]  ksys_write+0x50/0xc0
<4> [95.646602]  do_syscall_64+0x55/0x190
<4> [95.646609]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [95.646614] RIP: 0033:0x7fee9028c281
<4> [95.646619] 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> [95.646622] RSP: 002b:00007ffce7898488 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
<4> [95.646630] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fee9028c281
<4> [95.646634] RDX: 0000000000000005 RSI: 00007ffce7898510 RDI: 0000000000000008
<4> [95.646637] RBP: 00007ffce78984b0 R08: 0000000000000000 R09: 0000000000000000
<4> [95.646641] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fee90275718
<4> [95.646645] R13: 0000000000000003 R14: 00007fee9027a628 R15: 00007fee90276d80
<4> [95.646664] irq event stamp: 213118
<4> [95.646671] hardirqs last  enabled at (213117): [<ffffffff810f828a>] console_unlock+0x3fa/0x5f0
<4> [95.646676] hardirqs last disabled at (213118): [<ffffffff81001930>] trace_hardirqs_off_thunk+0x1a/0x1c
<4> [95.646682] softirqs last  enabled at (213100): [<ffffffff81c00319>] __do_softirq+0x319/0x48e
<4> [95.646688] softirqs last disabled at (213079): [<ffffffff8108c5e9>] irq_exit+0xa9/0xc0
<4> [95.646752] WARNING: CPU: 3 PID: 2130 at drivers/gpu/drm/i915/intel_ringbuffer.c:414 init_ring_common+0x8fd/0x9f0 [i915]
<4> [95.646756] ---[ end trace 8c952f29586b41f8 ]---
<3> [95.757112] [drm:init_ring_common [i915]] *ERROR* rcs0 initialization failed ctl 00000000 (valid? 0) head 00000000 [00004d90] tail 00000000 [00004d90] start 00000000 [expected 00001000]
<3> [95.757272] [drm:i915_gem_init_hw [i915]] *ERROR* Failed to restart rcs0 (-5)
<3> [95.757361] [drm:i915_reset [i915]] *ERROR* Failed to initialise HW following reset (-5)