igt@kms_flip@* - dmesg-warn - WARNING: CPU: \d PID: \d+ at kernel/rcu/tree_plugin.h:\d+ rcu_note_context_switch
<4> [373.972860] WARNING: CPU: 0 PID: 1158 at kernel/rcu/tree_plugin.h:293 rcu_note_context_switch+0x87/0x650
<4> [373.974619] Modules linked in: vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic mei_hdcp i915 x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hwdep lpc_ich snd_hda_core snd_pcm r8169 mei_me realtek mei prime_numbers intel_lpss_pci pinctrl_broxton pinctrl_intel
<4> [373.978505] CPU: 0 PID: 1158 Comm: kms_flip Tainted: G UD 5.6.0-rc2-CI-CI_DRM_7968+ #1
<4> [373.980500] Hardware name: /NUC6CAYB, BIOS AYAPLCEL.86A.0049.2018.0508.1356 05/08/2018
<4> [373.982518] RIP: 0010:rcu_note_context_switch+0x87/0x650
<4> [373.984543] Code: 00 7f 01 00 8b b8 8c 08 00 00 85 ff 0f 84 c3 01 00 00 45 84 ed 75 15 65 48 8b 04 25 00 7f 01 00 8b 88 80 03 00 00 85 c9 7e 02 <0f> 0b 65 48 8b 04 25 00 7f 01 00 8b 90 80 03 00 00 85 d2 7e 0f 41
<4> [373.986729] RSP: 0018:ffffc900005b3e28 EFLAGS: 00010002
<4> [373.988916] RAX: ffff888265c327c0 RBX: ffff888277c3c680 RCX: 0000000000000001
<4> [373.991127] RDX: 0000000000000002 RSI: ffffffff8112ef75 RDI: 0000000000000000
<4> [373.993342] RBP: ffffc900005b3ec0 R08: 0000000000000000 R09: 0000000000000000
<4> [373.995558] R10: 0000000000000001 R11: 00000000ffffffff R12: ffff888265c327c0
<4> [373.997781] R13: 0000000000000000 R14: ffff888277c3b958 R15: 0000000000000000
<4> [374.000008] FS: 00007f353d767e40(0000) GS:ffff888277c00000(0000) knlGS:0000000000000000
<4> [374.002255] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [374.004509] CR2: 00007f353c255ddc CR3: 00000002681ea000 CR4: 00000000003406f0
<4> [374.006800] Call Trace:
<4> [374.009096] __schedule+0xd0/0x800
<4> [374.011387] schedule+0x37/0xe0
<4> [374.013669] do_exit+0xaa7/0xd50
<4> [374.015941] ? do_group_exit+0x42/0xb0
<4> [374.018214] rewind_stack_do_exit+0x17/0x20
<4> [374.020486] irq event stamp: 407892
<4> [374.022756] hardirqs last enabled at (407891): [<ffffffff8125a1ed>] __slab_alloc.isra.89.constprop.94+0x4d/0x70
<4> [374.025084] hardirqs last disabled at (407892): [<ffffffff81293a04>] set_root+0x44/0x130
<4> [374.027406] softirqs last enabled at (407876): [<ffffffff81e00385>] __do_softirq+0x385/0x47f
<4> [374.029730] softirqs last disabled at (407861): [<ffffffff810bab3a>] irq_exit+0xba/0xc0
<4> [374.032050] ---[ end trace 1494b80ad43f0e58 ]---
<7> [374.034525] i915 0000:00:02.0: [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x00000010, dig 0x10001819, pins 0x00000020, long 0x00000000
<7> [374.037150] [drm:intel_hpd_irq_handler [i915]] digital hpd on [ENCODER:110:DDI B] - short
<7> [374.039811] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on [ENCODER:110:DDI B] - short
<7> [374.052808] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 01 15 01 81 00 00 04 00 0f 00 04
<7> [374.063314] [drm:drm_dp_read_desc] DP branch: OUI 00-60-ad dev-ID MC2800 HW-rev 2.2 SW-rev 1.76 quirks 0x0000
<3> [438.595108] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
<3> [438.602086] rcu: Tasks blocked on level-0 rcu_node (CPUs 0-3): P1158
<4> [438.609056] (detected by 1, t=65009 jiffies, g=84633, q=2265)
<6> [438.613398] kms_flip D11152 1158 977 0x80004002
<4> [438.616746] Call Trace:
<4> [438.620085] ? __schedule+0x2e5/0x800
<4> [438.623428] schedule+0x37/0xe0
<4> [438.626761] do_exit+0xaa7/0xd50
<4> [438.630082] ? do_group_exit+0x42/0xb0
<4> [438.633404] rewind_stack_do_exit+0x17/0x20
````