$ cat dmesg-Panic#1.log <7>[ 1049.254729] [drm:intel_dp_detect [i915]] [CONNECTOR:54:DP-1] <7>[ 1049.254920] [drm:i915_redisable_vga_power_on [i915]] Something enabled VGA plane, disabling it <7>[ 1049.255377] [drm:intel_power_well_enable [i915]] enabling dpio-common-bc <7>[ 1049.257918] [drm:chv_dpio_cmn_power_well_enable [i915]] Enabled DPIO PHY0 (PHY_CONTROL=0x050007fd) <7>[ 1049.260215] [drm:intel_power_well_enable [i915]] enabling dpio-common-d <7>[ 1049.262671] [drm:chv_dpio_cmn_power_well_enable [i915]] Enabled DPIO PHY1 (PHY_CONTROL=0x050007ff) <7>[ 1049.264926] [drm:drm_helper_hpd_irq_event] [CONNECTOR:54:DP-1] status updated from disconnected to disconnected <7>[ 1049.265022] [drm:intel_hdmi_detect [i915]] [CONNECTOR:58:HDMI-A-1] <7>[ 1049.267243] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1) <7>[ 1049.267328] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry <7>[ 1049.268639] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1) <7>[ 1049.268665] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb <7>[ 1049.269610] [drm:intel_atomic_check [i915]] New cdclk calculated to be logical 200000 kHz, actual 200000 kHz <7>[ 1049.269935] [drm:intel_atomic_commit_tail [i915]] [ENCODER:53:DP B] <7>[ 1049.270031] [drm:intel_atomic_commit_tail [i915]] [ENCODER:57:HDMI B] <7>[ 1049.270125] [drm:intel_atomic_commit_tail [i915]] [ENCODER:60:DP D] <7>[ 1049.270218] [drm:intel_atomic_commit_tail [i915]] [ENCODER:62:HDMI D] <7>[ 1049.270326] [drm:verify_connector_state.isra.47 [i915]] [CONNECTOR:63:HDMI-A-2] <7>[ 1049.270444] [drm:intel_atomic_commit_tail [i915]] [CRTC:52:pipe C] <7>[ 1049.270633] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1) <7>[ 1049.270725] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry <7>[ 1049.272920] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1) <7>[ 1049.272946] [drm:drm_dp_dual_mode_detect] DP dual mode HDMI ID: (err -6) <7>[ 1049.272966] [drm:drm_helper_hpd_irq_event] [CONNECTOR:58:HDMI-A-1] status updated from disconnected to disconnected <7>[ 1049.273062] [drm:intel_dp_detect [i915]] [CONNECTOR:61:DP-2] <7>[ 1049.273091] [drm:drm_helper_hpd_irq_event] [CONNECTOR:61:DP-2] status updated from disconnected to disconnected <7>[ 1049.273183] [drm:intel_hdmi_detect [i915]] [CONNECTOR:63:HDMI-A-2] <7>[ 1049.315880] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus panel] NAK for addr: 0040 w(1) <7>[ 1049.316110] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus panel] NAK on first message, retry <7>[ 1049.318528] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus panel] NAK for addr: 0040 w(1) <7>[ 1049.318756] [drm:drm_dp_dual_mode_detect] DP dual mode HDMI ID: (err -6) <7>[ 1049.318811] [drm:drm_helper_hpd_irq_event] [CONNECTOR:63:HDMI-A-2] status updated from connected to connected <6>[ 1049.470301] PM: suspend of devices complete after 228.507 msecs <7>[ 1049.481275] [drm:intel_power_well_disable [i915]] disabling dpio-common-d <7>[ 1049.481408] [drm:chv_dpio_cmn_power_well_disable [i915]] Disabled DPIO PHY1 (PHY_CONTROL=0x050007fd) <7>[ 1049.481575] [drm:intel_power_well_disable [i915]] disabling dpio-common-bc <7>[ 1049.484311] [drm:chv_dpio_cmn_power_well_disable [i915]] Disabled DPIO PHY0 (PHY_CONTROL=0x050007fc) <7>[ 1049.484477] [drm:intel_power_well_disable [i915]] disabling display <7>[ 1049.484732] [drm:intel_power_well_disable [i915]] disabling always-on <6>[ 1049.499250] PM: late suspend of devices complete after 28.905 msecs <6>[ 1049.510925] r8169 0000:03:00.0: System wakeup enabled by ACPI <6>[ 1049.515754] xhci_hcd 0000:00:14.0: System wakeup enabled by ACPI <6>[ 1049.535805] PM: noirq suspend of devices complete after 36.529 msecs <6>[ 1049.535890] ACPI: Preparing to enter system sleep state S3 <6>[ 1049.548570] PM: Saving platform NVS memory <6>[ 1049.548698] Disabling non-boot CPUs ... <5>[ 1049.569912] Broke affinity for irq 9 <5>[ 1049.570040] Broke affinity for irq 115 <5>[ 1049.570067] Broke affinity for irq 116 <5>[ 1049.570093] Broke affinity for irq 117 <5>[ 1049.570119] Broke affinity for irq 118 <6>[ 1049.571735] smpboot: CPU 1 is now offline <6>[ 1049.574812] ACPI: Low-level resume complete <6>[ 1049.575054] PM: Restoring platform NVS memory <6>[ 1049.575732] Suspended for 20.377 seconds <6>[ 1049.575811] Enabling non-boot CPUs ... <6>[ 1049.576069] x86: Booting SMP configuration: <6>[ 1049.576080] smpboot: Booting Node 0 Processor 1 APIC 0x4 <3>[ 1049.576313] BUG: scheduling while atomic: swapper/1/0/0x00000002 <4>[ 1049.576321] no locks held by swapper/1/0. <4>[ 1049.576325] Modules linked in: snd_hda_intel i915 vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core r8169 mii lpc_ich snd_pcm sdhci_pci i2c_designware_pci prime_numbers i2c_hid i2c_designware_platform i2c_designware_core [last unloaded: i915] <3>[ 1049.576439] Preemption disabled at: <4>[ 1049.576453] [] start_secondary+0x1d/0x120 <4>[ 1049.576465] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1049.576471] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1049.576477] Call Trace: <4>[ 1049.576491] dump_stack+0x67/0x92 <4>[ 1049.576499] ? start_secondary+0x1d/0x120 <4>[ 1049.576507] __schedule_bug+0x7e/0xe0 <4>[ 1049.576517] __schedule+0x88e/0xbc0 <4>[ 1049.576529] schedule+0x3b/0x90 <4>[ 1049.576538] schedule_hrtimeout_range_clock+0xd1/0x150 <4>[ 1049.576548] ? __hrtimer_run_queues+0x530/0x530 <4>[ 1049.576559] schedule_hrtimeout+0x12/0x20 <4>[ 1049.576566] wait_task_inactive+0x288/0x290 <4>[ 1049.576581] __kthread_bind_mask+0x19/0x70 <4>[ 1049.576589] kthread_unpark+0x62/0x90 <4>[ 1049.576599] cpuhp_online_idle+0x50/0x90 <4>[ 1049.576609] cpu_startup_entry+0x13/0x20 <4>[ 1049.576616] start_secondary+0x102/0x120 <4>[ 1049.576624] start_cpu+0x14/0x14 <4>[ 1049.576649] ------------[ cut here ]------------ <4>[ 1049.576655] WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:3548 lock_release+0x4e1/0x4f0 <4>[ 1049.576658] releasing a pinned lock <4>[ 1049.576659] Modules linked in: snd_hda_intel i915 vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core r8169 mii lpc_ich snd_pcm sdhci_pci i2c_designware_pci prime_numbers i2c_hid i2c_designware_platform i2c_designware_core [last unloaded: i915] <4>[ 1049.576690] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1049.576692] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1049.576693] Call Trace: <4>[ 1049.576697] dump_stack+0x67/0x92 <4>[ 1049.576701] __warn+0xc6/0xe0 <4>[ 1049.576704] ? dequeue_task_idle+0xd/0x30 <4>[ 1049.576708] warn_slowpath_fmt+0x4a/0x50 <4>[ 1049.576712] lock_release+0x4e1/0x4f0 <4>[ 1049.576719] _raw_spin_unlock_irq+0x1a/0x50 <4>[ 1049.576722] dequeue_task_idle+0xd/0x30 <4>[ 1049.576726] deactivate_task+0x94/0x120 <4>[ 1049.576729] __schedule+0x4c1/0xbc0 <4>[ 1049.576733] schedule+0x3b/0x90 <4>[ 1049.576736] schedule_hrtimeout_range_clock+0xd1/0x150 <4>[ 1049.576740] ? __hrtimer_run_queues+0x530/0x530 <4>[ 1049.576744] schedule_hrtimeout+0x12/0x20 <4>[ 1049.576747] wait_task_inactive+0x288/0x290 <4>[ 1049.576752] __kthread_bind_mask+0x19/0x70 <4>[ 1049.576755] kthread_unpark+0x62/0x90 <4>[ 1049.576759] cpuhp_online_idle+0x50/0x90 <4>[ 1049.576762] cpu_startup_entry+0x13/0x20 <4>[ 1049.576765] start_secondary+0x102/0x120 <4>[ 1049.576769] start_cpu+0x14/0x14 <4>[ 1049.576774] ---[ end trace 0e6a59f5af8d5d08 ]--- <3>[ 1049.576777] bad: scheduling from the idle thread! <4>[ 1049.576783] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1049.576788] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1049.576791] Call Trace: <4>[ 1049.576799] dump_stack+0x67/0x92 <4>[ 1049.576807] dequeue_task_idle+0x1e/0x30 <4>[ 1049.576814] deactivate_task+0x94/0x120 <4>[ 1049.576822] __schedule+0x4c1/0xbc0 <4>[ 1049.576834] schedule+0x3b/0x90 <4>[ 1049.576842] schedule_hrtimeout_range_clock+0xd1/0x150 <4>[ 1049.576850] ? __hrtimer_run_queues+0x530/0x530 <4>[ 1049.576860] schedule_hrtimeout+0x12/0x20 <4>[ 1049.576867] wait_task_inactive+0x288/0x290 <4>[ 1049.576880] __kthread_bind_mask+0x19/0x70 <4>[ 1049.576888] kthread_unpark+0x62/0x90 <4>[ 1049.576896] cpuhp_online_idle+0x50/0x90 <4>[ 1049.576903] cpu_startup_entry+0x13/0x20 <4>[ 1049.576910] start_secondary+0x102/0x120 <4>[ 1049.576917] start_cpu+0x14/0x14 <4>[ 1049.576937] ------------[ cut here ]------------ <4>[ 1049.576942] WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:3670 lock_unpin_lock+0x15b/0x160 <4>[ 1049.576943] unpinning an unpinned lock <4>[ 1049.576944] Modules linked in: snd_hda_intel i915 vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core r8169 mii lpc_ich snd_pcm sdhci_pci i2c_designware_pci prime_numbers i2c_hid i2c_designware_platform i2c_designware_core [last unloaded: i915] <4>[ 1049.576975] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1049.576977] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1049.576978] Call Trace: <4>[ 1049.576982] dump_stack+0x67/0x92 <4>[ 1049.576986] __warn+0xc6/0xe0 <4>[ 1049.576990] warn_slowpath_fmt+0x4a/0x50 <4>[ 1049.576994] lock_unpin_lock+0x15b/0x160 <4>[ 1049.576998] __schedule+0x3d4/0xbc0 <4>[ 1049.577002] schedule+0x3b/0x90 <4>[ 1049.577006] schedule_hrtimeout_range_clock+0xd1/0x150 <4>[ 1049.577009] ? __hrtimer_run_queues+0x530/0x530 <4>[ 1049.577013] schedule_hrtimeout+0x12/0x20 <4>[ 1049.577016] wait_task_inactive+0x288/0x290 <4>[ 1049.577021] __kthread_bind_mask+0x19/0x70 <4>[ 1049.577024] kthread_unpark+0x62/0x90 <4>[ 1049.577028] cpuhp_online_idle+0x50/0x90 <4>[ 1049.577031] cpu_startup_entry+0x13/0x20 <4>[ 1049.577034] start_secondary+0x102/0x120 <4>[ 1049.577038] start_cpu+0x14/0x14 <4>[ 1049.577042] ---[ end trace 0e6a59f5af8d5d09 ]--- <4>[ 1049.577932] ------------[ cut here ]------------ <4>[ 1049.578310] WARNING: CPU: 1 PID: 0 at kernel/sched/sched.h:833 set_next_entity+0xb22/0xfe0 <4>[ 1049.578313] rq->clock_update_flags < RQCF_ACT_SKIP <4>[ 1049.578315] Modules linked in: snd_hda_intel i915 vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core r8169 mii lpc_ich snd_pcm sdhci_pci i2c_designware_pci prime_numbers i2c_hid i2c_designware_platform i2c_designware_core [last unloaded: i915] <4>[ 1049.578386] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1049.578389] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1049.578390] Call Trace: <4>[ 1049.578395] dump_stack+0x67/0x92 <4>[ 1049.578400] __warn+0xc6/0xe0 <4>[ 1049.578406] warn_slowpath_fmt+0x4a/0x50 <4>[ 1049.578413] set_next_entity+0xb22/0xfe0 <4>[ 1049.578420] pick_next_task_fair+0x76/0x840 <4>[ 1049.578425] ? debug_smp_processor_id+0x17/0x20 <4>[ 1049.578429] ? prandom_u32+0x39/0x60 <4>[ 1049.578436] __schedule+0x11c/0xbc0 <4>[ 1049.578442] ? preempt_schedule+0x1f/0x30 <4>[ 1049.578446] preempt_schedule_common+0x37/0x90 <4>[ 1049.578451] preempt_schedule+0x1f/0x30 <4>[ 1049.578455] ___preempt_schedule+0x16/0x18 <4>[ 1049.578462] _raw_spin_unlock_irqrestore+0x5b/0x60 <4>[ 1049.578467] try_to_wake_up+0x25a/0x650 <4>[ 1049.578472] ? _raw_spin_unlock_irqrestore+0x3d/0x60 <4>[ 1049.578478] wake_up_state+0xb/0x10 <4>[ 1049.578482] kthread_unpark+0x6f/0x90 <4>[ 1049.578486] cpuhp_online_idle+0x50/0x90 <4>[ 1049.578491] cpu_startup_entry+0x13/0x20 <4>[ 1049.578495] start_secondary+0x102/0x120 <4>[ 1049.578500] start_cpu+0x14/0x14 <4>[ 1049.578509] ---[ end trace 0e6a59f5af8d5d0a ]--- <4>[ 1049.578515] ------------[ cut here ]------------ <4>[ 1049.578520] WARNING: CPU: 1 PID: 0 at kernel/sched/sched.h:833 __schedule+0x965/0xbc0 <4>[ 1049.578522] rq->clock_update_flags < RQCF_ACT_SKIP <4>[ 1049.578524] Modules linked in: snd_hda_intel i915 vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core r8169 mii lpc_ich snd_pcm sdhci_pci i2c_designware_pci prime_numbers i2c_hid i2c_designware_platform i2c_designware_core [last unloaded: i915] <4>[ 1049.578573] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1049.578576] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1049.578577] Call Trace: <4>[ 1049.578582] dump_stack+0x67/0x92 <4>[ 1049.578587] __warn+0xc6/0xe0 <4>[ 1049.578592] warn_slowpath_fmt+0x4a/0x50 <4>[ 1049.578599] __schedule+0x965/0xbc0 <4>[ 1049.578605] ? preempt_schedule+0x1f/0x30 <4>[ 1049.578609] preempt_schedule_common+0x37/0x90 <4>[ 1049.578614] preempt_schedule+0x1f/0x30 <4>[ 1049.578619] ___preempt_schedule+0x16/0x18 <4>[ 1049.578626] _raw_spin_unlock_irqrestore+0x5b/0x60 <4>[ 1049.578630] try_to_wake_up+0x25a/0x650 <4>[ 1049.578635] ? _raw_spin_unlock_irqrestore+0x3d/0x60 <4>[ 1049.578641] wake_up_state+0xb/0x10 <4>[ 1049.578645] kthread_unpark+0x6f/0x90 <4>[ 1049.578650] cpuhp_online_idle+0x50/0x90 <4>[ 1049.578654] cpu_startup_entry+0x13/0x20 <4>[ 1049.578658] start_secondary+0x102/0x120 <4>[ 1049.578663] start_cpu+0x14/0x14 <4>[ 1049.578671] ---[ end trace 0e6a59f5af8d5d0b ]--- <4>[ 1049.578681] <4>[ 1049.578683] ====================================================== <4>[ 1049.578684] [ INFO: possible circular locking dependency detected ] <4>[ 1049.578685] 4.11.0-rc4-CI-CI_DRM_318+ #1 Tainted: G U W <4>[ 1049.578686] ------------------------------------------------------- <4>[ 1049.578687] swapper/1/0 is trying to acquire lock: <4>[ 1049.578688] ((console_sem).lock){-.-...}, at: [] down_trylock+0xf/0x40 <4>[ 1049.578692] <4>[ 1049.578693] but task is already holding lock: <4>[ 1049.578694] (&rq->lock){-.-.-.}, at: [] __schedule+0xa2/0xbc0 <4>[ 1049.578697] <4>[ 1049.578698] which lock already depends on the new lock. <4>[ 1049.578699] <4>[ 1049.578700] <4>[ 1049.578701] the existing dependency chain (in reverse order) is: <4>[ 1049.578702] <4>[ 1049.578703] -> #2 (&rq->lock){-.-.-.}: <4>[ 1049.578707] lock_acquire+0xc9/0x220 <4>[ 1049.578708] _raw_spin_lock+0x36/0x50 <4>[ 1049.578709] task_fork_fair+0x35/0xf0 <4>[ 1049.578710] sched_fork+0x254/0x400 <4>[ 1049.578711] copy_process.part.6+0x589/0x2000 <4>[ 1049.578712] _do_fork+0xc8/0x700 <4>[ 1049.578713] kernel_thread+0x24/0x30 <4>[ 1049.578714] rest_init+0x1d/0x130 <4>[ 1049.578715] start_kernel+0x3f1/0x3fe <4>[ 1049.578716] x86_64_start_reservations+0x2a/0x2c <4>[ 1049.578717] x86_64_start_kernel+0x173/0x186 <4>[ 1049.578718] verify_cpu+0x0/0xfc <4>[ 1049.578719] <4>[ 1049.578719] -> #1 (&p->pi_lock){-.-.-.}: <4>[ 1049.578723] lock_acquire+0xc9/0x220 <4>[ 1049.578724] _raw_spin_lock_irqsave+0x41/0x60 <4>[ 1049.578725] try_to_wake_up+0x2b/0x650 <4>[ 1049.578726] wake_up_process+0x10/0x20 <4>[ 1049.578727] __up.isra.0+0x47/0x50 <4>[ 1049.578728] up+0x41/0x50 <4>[ 1049.578730] __up_console_sem+0x32/0x50 <4>[ 1049.578731] console_unlock+0x260/0x530 <4>[ 1049.578732] register_framebuffer+0x262/0x330 <4>[ 1049.578733] drm_fb_helper_initial_config+0x232/0x410 <4>[ 1049.578734] intel_fbdev_initial_config+0x13/0x30 [i915] <4>[ 1049.578735] async_run_entry_fn+0x34/0x160 <4>[ 1049.578736] process_one_work+0x1f4/0x6d0 <4>[ 1049.578737] worker_thread+0x49/0x4a0 <4>[ 1049.578738] kthread+0x107/0x140 <4>[ 1049.578739] ret_from_fork+0x2e/0x40 <4>[ 1049.578739] <4>[ 1049.578740] -> #0 ((console_sem).lock){-.-...}: <4>[ 1049.578744] __lock_acquire+0x1ac0/0x1bb0 <4>[ 1049.578745] lock_acquire+0xc9/0x220 <4>[ 1049.578746] _raw_spin_lock_irqsave+0x41/0x60 <4>[ 1049.578747] down_trylock+0xf/0x40 <4>[ 1049.578748] __down_trylock_console_sem+0x29/0x80 <4>[ 1049.578749] console_trylock+0x11/0x80 <4>[ 1049.578750] vprintk_emit+0x27a/0x380 <4>[ 1049.578751] vprintk_default+0x1a/0x20 <4>[ 1049.578752] vprintk_func+0x20/0x80 <4>[ 1049.578753] printk+0x3e/0x46 <4>[ 1049.578754] __warn+0x34/0xe0 <4>[ 1049.578755] warn_slowpath_fmt+0x4a/0x50 <4>[ 1049.578756] set_next_entity+0xb22/0xfe0 <4>[ 1049.578757] pick_next_task_fair+0x76/0x840 <4>[ 1049.578758] __schedule+0x11c/0xbc0 <4>[ 1049.578759] preempt_schedule_common+0x37/0x90 <4>[ 1049.578760] preempt_schedule+0x1f/0x30 <4>[ 1049.578761] ___preempt_schedule+0x16/0x18 <4>[ 1049.578762] _raw_spin_unlock_irqrestore+0x5b/0x60 <4>[ 1049.578763] try_to_wake_up+0x25a/0x650 <4>[ 1049.578764] wake_up_state+0xb/0x10 <4>[ 1049.578765] kthread_unpark+0x6f/0x90 <4>[ 1049.578766] cpuhp_online_idle+0x50/0x90 <4>[ 1049.578767] cpu_startup_entry+0x13/0x20 <4>[ 1049.578767] start_secondary+0x102/0x120 <4>[ 1049.578768] verify_cpu+0x0/0xfc <4>[ 1049.578769] <4>[ 1049.578770] other info that might help us debug this: <4>[ 1049.578771] <4>[ 1049.578772] Chain exists of: <4>[ 1049.578772] (console_sem).lock --> &p->pi_lock --> &rq->lock <4>[ 1049.578778] <4>[ 1049.578779] Possible unsafe locking scenario: <4>[ 1049.578779] <4>[ 1049.578780] CPU0 CPU1 <4>[ 1049.578781] ---- ---- <4>[ 1049.578782] lock(&rq->lock); <4>[ 1049.578785] lock(&p->pi_lock); <4>[ 1049.578787] lock(&rq->lock); <4>[ 1049.578789] lock((console_sem).lock); <4>[ 1049.578792] <4>[ 1049.578793] *** DEADLOCK *** <4>[ 1049.578793] <4>[ 1049.578794] 1 lock held by swapper/1/0: <4>[ 1049.578795] #0: (&rq->lock){-.-.-.}, at: [] __schedule+0xa2/0xbc0 <4>[ 1049.578799] <4>[ 1049.578800] stack backtrace: <4>[ 1049.578801] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1049.578803] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1049.578804] Call Trace: <4>[ 1049.578805] dump_stack+0x67/0x92 <4>[ 1049.578806] print_circular_bug+0x1e0/0x2e0 <4>[ 1049.578807] __lock_acquire+0x1ac0/0x1bb0 <4>[ 1049.578808] ? pointer+0x29b/0x3f0 <4>[ 1049.578809] lock_acquire+0xc9/0x220 <4>[ 1049.578809] ? down_trylock+0xf/0x40 <4>[ 1049.578810] ? vprintk_emit+0x27a/0x380 <4>[ 1049.578811] _raw_spin_lock_irqsave+0x41/0x60 <4>[ 1049.578812] ? down_trylock+0xf/0x40 <4>[ 1049.578813] down_trylock+0xf/0x40 <4>[ 1049.578814] __down_trylock_console_sem+0x29/0x80 <4>[ 1049.578815] console_trylock+0x11/0x80 <4>[ 1049.578816] ? trace_hardirqs_off+0xd/0x10 <4>[ 1049.578817] vprintk_emit+0x27a/0x380 <4>[ 1049.578818] ? set_next_entity+0xb22/0xfe0 <4>[ 1049.578819] vprintk_default+0x1a/0x20 <4>[ 1049.578820] vprintk_func+0x20/0x80 <4>[ 1049.578821] printk+0x3e/0x46 <4>[ 1049.578822] ? set_next_entity+0xb22/0xfe0 <4>[ 1049.578823] __warn+0x34/0xe0 <4>[ 1049.578824] warn_slowpath_fmt+0x4a/0x50 <4>[ 1049.578825] set_next_entity+0xb22/0xfe0 <4>[ 1049.578826] pick_next_task_fair+0x76/0x840 <4>[ 1049.578828] ? debug_smp_processor_id+0x17/0x20 <4>[ 1049.578829] ? prandom_u32+0x39/0x60 <4>[ 1049.578830] __schedule+0x11c/0xbc0 <4>[ 1049.578831] ? preempt_schedule+0x1f/0x30 <4>[ 1049.578832] preempt_schedule_common+0x37/0x90 <4>[ 1049.578833] preempt_schedule+0x1f/0x30 <4>[ 1049.578834] ___preempt_schedule+0x16/0x18 <4>[ 1049.578835] _raw_spin_unlock_irqrestore+0x5b/0x60 <4>[ 1049.578836] try_to_wake_up+0x25a/0x650 <4>[ 1049.578837] ? _raw_spin_unlock_irqrestore+0x3d/0x60 <4>[ 1049.578838] wake_up_state+0xb/0x10 <4>[ 1049.578839] kthread_unpark+0x6f/0x90 <4>[ 1049.578840] cpuhp_online_idle+0x50/0x90 <4>[ 1049.578841] cpu_startup_entry+0x13/0x20 <4>[ 1049.578842] start_secondary+0x102/0x120 <4>[ 1049.578843] start_cpu+0x14/0x14 <4>[ 1053.579064] ------------[ cut here ]------------ <4>[ 1053.579076] WARNING: CPU: 1 PID: 0 at kernel/sched/sched.h:833 pick_next_task_rt+0x250/0x260 <4>[ 1053.579079] rq->clock_update_flags < RQCF_ACT_SKIP <4>[ 1053.579083] Modules linked in: snd_hda_intel i915 vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core r8169 mii lpc_ich snd_pcm sdhci_pci i2c_designware_pci prime_numbers i2c_hid i2c_designware_platform i2c_designware_core [last unloaded: i915] <4>[ 1053.579160] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1053.579165] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1053.579168] Call Trace: <4>[ 1053.579176] dump_stack+0x67/0x92 <4>[ 1053.579182] __warn+0xc6/0xe0 <4>[ 1053.579188] warn_slowpath_fmt+0x4a/0x50 <4>[ 1053.579195] pick_next_task_rt+0x250/0x260 <4>[ 1053.579202] __schedule+0x160/0xbc0 <4>[ 1053.579210] ? trace_hardirqs_on_thunk+0x1a/0x1c <4>[ 1053.579216] preempt_schedule_irq+0x3d/0x60 <4>[ 1053.579221] retint_kernel+0x1b/0x2d <4>[ 1053.579227] RIP: 0010:mwait_idle+0x93/0x210 <4>[ 1053.579232] RSP: 0000:ffffc9000007beb0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 <4>[ 1053.579237] RAX: 0000000000000000 RBX: ffff88017a830040 RCX: 0000000000000000 <4>[ 1053.579239] RDX: 0000000000000000 RSI: ffffffff81c74edd RDI: ffffffff8189111a <4>[ 1053.579242] RBP: ffffc9000007bec0 R08: 0000000000000001 R09: 0000000000000000 <4>[ 1053.579244] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 <4>[ 1053.579247] R13: ffff88017a830040 R14: ffff88017fd23a10 R15: ffffffff81ec59a0 <4>[ 1053.579255] ? mwait_idle+0x8a/0x210 <4>[ 1053.579263] arch_cpu_idle+0xa/0x10 <4>[ 1053.579268] default_idle_call+0x1e/0x30 <4>[ 1053.579273] do_idle+0x164/0x1f0 <4>[ 1053.579278] cpu_startup_entry+0x18/0x20 <4>[ 1053.579284] start_secondary+0x102/0x120 <4>[ 1053.579290] start_cpu+0x14/0x14 <4>[ 1053.579298] ---[ end trace 0e6a59f5af8d5d0c ]--- <3>[ 1088.020376] INFO: task cpuhp/1:14 blocked for more than 30 seconds. <3>[ 1088.020396] Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <3>[ 1088.020405] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. <6>[ 1088.020418] cpuhp/1 D 0 14 2 0x00000000 <4>[ 1088.020442] Call Trace: <4>[ 1088.020482] __schedule+0x3fd/0xbc0 <4>[ 1088.020508] schedule+0x3b/0x90 <4>[ 1088.020528] _synchronize_rcu_expedited+0x2e2/0x370 <4>[ 1088.020545] ? rcu_stall_kick_kthreads.part.44+0xd0/0xd0 <4>[ 1088.020561] ? wake_atomic_t_function+0x30/0x30 <4>[ 1088.020576] ? rcu_stall_kick_kthreads.part.44+0xd0/0xd0 <4>[ 1088.020593] ? cond_synchronize_sched+0x20/0x20 <4>[ 1088.020617] synchronize_sched_expedited+0x70/0xf0 <4>[ 1088.020631] synchronize_rcu_bh+0x9a/0x120 <4>[ 1088.020655] ? kmem_cache_alloc_trace+0x1f5/0x2e0 <4>[ 1088.020672] ? pcrypt_cpumask_change_notify+0x3b/0x80 <4>[ 1088.020692] pcrypt_cpumask_change_notify+0x55/0x80 <4>[ 1088.020713] notifier_call_chain+0x34/0xa0 <4>[ 1088.020738] __blocking_notifier_call_chain+0x48/0x70 <4>[ 1088.020757] blocking_notifier_call_chain+0x11/0x20 <4>[ 1088.020775] padata_replace+0x7f/0x110 <4>[ 1088.020794] padata_cpu_online+0x8d/0xf0 <4>[ 1088.020815] cpuhp_invoke_callback+0x4e3/0x8a0 <4>[ 1088.020835] ? padata_replace+0x110/0x110 <4>[ 1088.020853] cpuhp_up_callbacks+0x31/0xb0 <4>[ 1088.020872] cpuhp_thread_fun+0xf9/0x110 <4>[ 1088.020887] smpboot_thread_fn+0x180/0x280 <4>[ 1088.020906] kthread+0x107/0x140 <4>[ 1088.020917] ? sort_range+0x20/0x20 <4>[ 1088.020931] ? kthread_create_on_node+0x40/0x40 <4>[ 1088.020953] ret_from_fork+0x2e/0x40 <4>[ 1088.020983] INFO: lockdep is turned off. <4>[ 1088.020994] NMI backtrace for cpu 0 <4>[ 1088.021012] CPU: 0 PID: 24 Comm: khungtaskd Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1088.021022] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1088.021029] Call Trace: <4>[ 1088.021046] dump_stack+0x67/0x92 <4>[ 1088.021064] ? irq_force_complete_move+0xf0/0xf0 <4>[ 1088.021080] nmi_cpu_backtrace+0x92/0xa0 <4>[ 1088.021094] ? irq_force_complete_move+0xf0/0xf0 <4>[ 1088.021109] nmi_trigger_cpumask_backtrace+0xc0/0x100 <4>[ 1088.021127] arch_trigger_cpumask_backtrace+0x14/0x20 <4>[ 1088.021141] watchdog+0x433/0x600 <4>[ 1088.021152] ? watchdog+0x9c/0x600 <4>[ 1088.021171] kthread+0x107/0x140 <4>[ 1088.021183] ? reset_hung_task_detector+0x10/0x10 <4>[ 1088.021195] ? kthread_create_on_node+0x40/0x40 <4>[ 1088.021215] ret_from_fork+0x2e/0x40 <6>[ 1088.021248] Sending NMI from CPU 0 to CPUs 1: <4>[ 1088.021272] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff81891123 <0>[ 1088.022315] Kernel panic - not syncing: hung_task: blocked tasks <4>[ 1088.022334] CPU: 0 PID: 24 Comm: khungtaskd Tainted: G U W 4.11.0-rc4-CI-CI_DRM_318+ #1 <4>[ 1088.022343] Hardware name: /NUC5CPYB, BIOS PYBSWCEL.86A.0058.2016.1102.1842 11/02/2016 <4>[ 1088.022350] Call Trace: <4>[ 1088.022369] dump_stack+0x67/0x92 <4>[ 1088.022385] panic+0xcf/0x205 <4>[ 1088.022402] ? irq_force_complete_move+0xf0/0xf0 <4>[ 1088.022423] watchdog+0x43f/0x600 <4>[ 1088.022434] ? watchdog+0x9c/0x600 <4>[ 1088.022454] kthread+0x107/0x140 <4>[ 1088.022465] ? reset_hung_task_detector+0x10/0x10 <4>[ 1088.022478] ? kthread_create_on_node+0x40/0x40 <4>[ 1088.022497] ret_from_fork+0x2e/0x40 <0>[ 1088.022547] Kernel Offset: disabled