All tests - incomplete - NMI backtrace for cpu \d skipped: idling at intel_idle
https://intel-gfx-ci.01.org/tree/drm-tip/IGT_5633/shard-iclb1/igt@kms_rotation_crc@primary-y-tiled-reflect-x-180.html
<7> [538.152647] [drm:drm_mode_addfb2] [FB:216]
<3> [538.157520] rcu: INFO: rcu_preempt self-detected stall on CPU
<3> [538.157685] rcu: 4-...!: (1 ticks this GP) idle=39a/0/0x1 softirq=49261/49261 fqs=0
<4> [538.157863] (t=111848 jiffies g=139853 q=14)
<3> [538.157868] rcu: rcu_preempt kthread starved for 111848 jiffies! g139853 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=4
<3> [538.157873] rcu: RCU grace-period kthread stack dump:
<6> [538.157878] rcu_preempt I14304 10 2 0x80004000
<4> [538.157886] Call Trace:
<4> [538.157898] ? __schedule+0x2ff/0x8d0
<4> [538.157908] schedule+0x37/0xe0
<4> [538.157913] schedule_timeout+0x172/0x2e0
<4> [538.157921] ? __next_timer_interrupt+0xc0/0xc0
<4> [538.157932] rcu_gp_kthread+0x626/0xc10
<4> [538.157942] ? dump_blkd_tasks.constprop.73+0x1d0/0x1d0
<4> [538.157946] kthread+0x140/0x160
<4> [538.157951] ? kthread_park+0x80/0x80
<4> [538.157957] ret_from_fork+0x24/0x50
<6> [538.157978] Sending NMI from CPU 4 to CPUs 0:
<4> [538.158012] NMI backtrace for cpu 0 skipped: idling at intel_idle+0x7c/0x130
<7> [538.158672] i915 0000:00:02.0: [drm:edp_panel_vdd_off_sync [i915]] Turning [ENCODER:214:DDI A] VDD off
<7> [538.159034] i915 0000:00:02.0: [drm:edp_panel_vdd_off_sync [i915]] PP_STATUS: 0x80000008 PP_CONTROL: 0x00000067
<6> [538.159113] Sending NMI from CPU 4 to CPUs 1:
<7> [538.159465] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling DC off
<7> [538.159578] i915 0000:00:02.0: [drm:skl_enable_dc6 [i915]] Enabling DC6
<7> [538.159681] i915 0000:00:02.0: [drm:gen9_set_dc_state [i915]] Setting DC state from 00 to 02
<4> [538.160264] NMI backtrace for cpu 1
<4> [538.160266] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G U 5.7.0-rc3-CI-CI_DRM_8430+ #1
<4> [538.160268] Hardware name: Intel Corporation Ice Lake Client Platform/IceLake U DDR4 SODIMM PD RVP TLC, BIOS ICLSFWR1.R00.3234.A01.1906141750 06/14/2019
<4> [538.160269] RIP: 0010:queued_spin_lock_slowpath+0x129/0x1d0
<4> [538.160272] Code: 59 ff ff ff 83 c1 01 41 c1 e4 10 c1 e1 12 41 09 cc 44 89 e0 c1 e8 10 66 87 43 02 89 c2 c1 e2 10 85 d2 75 38 31 d2 eb 02 f3 90 <8b> 03 66 85 c0 75 f7 89 c1 66 31 c9 44 39 e1 74 7a 48 85 d2 c6 03
<4> [538.160273] RSP: 0018:ffffc90000170ec8 EFLAGS: 00000002
<4> [538.160275] RAX: 0000000000080101 RBX: ffffffff8264c980 RCX: 0000000000080000
<4> [538.160277] RDX: 0000000000000000 RSI: 0000000000000100 RDI: ffffffff8264c980
<4> [538.160278] RBP: ffff88849febc900 R08: ffff88849d518900 R09: 00000000fffffffe
<4> [538.160280] R10: 00000000da48d8d0 R11: 00000000fff40eef R12: 0000000000080000
<4> [538.160281] R13: 0000000000000009 R14: 0000000000000009 R15: 0000000000000000
<4> [538.160282] FS: 0000000000000000(0000) GS:ffff88849fe80000(0000) knlGS:0000000000000000
<4> [538.160284] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [538.160285] CR2: 00007fa7cab268a0 CR3: 0000000442c3a006 CR4: 0000000000760ee0
<4> [538.160286] PKRU: 55555554
<4> [538.160287] Call Trace:
<4> [538.160288] <IRQ>
<4> [538.160289] do_raw_spin_lock+0xac/0xb0
<4> [538.160290] _raw_spin_lock_irqsave+0x3b/0x50
<4> [538.160292] ? rcu_core+0x314/0x6d0
<4> [538.160293] rcu_core+0x314/0x6d0
<4> [538.160294] __do_softirq+0xdf/0x49e
<4> [538.160295] irq_exit+0xba/0xc0
<4> [538.160296] smp_apic_timer_interrupt+0xb7/0x280
<4> [538.160298] apic_timer_interrupt+0xf/0x20
<4> [538.160299] </IRQ>
<4> [538.160300] RIP: 0010:cpuidle_enter_state+0xb6/0x420
<4> [538.160302] Code: 00 31 ff e8 3c e8 89 ff 80 7c 24 0b 00 74 12 9c 58 f6 c4 02 0f 85 37 03 00 00 31 ff e8 b3 0c 91 ff e8 8e 39 95 ff fb 45 85 ed <0f> 88 cd 02 00 00 49 63 c5 4c 2b 24 24 48 8d 14 40 48 8d 14 90 48
<4> [538.160303] RSP: 0018:ffffc9000010be78 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
<4> [538.160306] RAX: 0000000080000001 RBX: ffffe8ffffaab588 RCX: 0000000000000000
<4> [538.160307] RDX: ffff88849d518040 RSI: 0000000000000006 RDI: ffffffff82386ee2
<4> [538.160308] RBP: ffffffff826b42e0 R08: 0000000000000000 R09: 0000000000000000
<4> [538.160310] R10: 0000000000000000 R11: 0000000000000000 R12: 0000007d4cc69424
<4> [538.160311] R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000001