======================================
| [   20.057850][   T34] softirqs last disabled at (95): __irq_exit_rcu (kernel/softirq.c:679 kernel/softirq.c:519 kernel/softirq.c:767)
| [   20.057852][   T34] Preemption disabled at:
| [   20.057853][   T34] vprintk_emit (kernel/printk/printk.c:2471)
| [   20.057862][   T34] Tainted: [W]=WARN
[   20.057863][   T34] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   20.057865][   T34] Workqueue: events_power_efficient phylink_resolve
[   20.057868][   T34] Call Trace:
[   20.057870][   T34]  <TASK>
[   20.057873][   T34]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   20.057878][   T34]  ? vprintk_emit (kernel/printk/printk.c:2471)
[   20.057880][   T34]  __might_resched.cold (kernel/sched/core.c:9234)
[   20.057885][   T34]  ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3))
[   20.057889][   T34]  ? __kmalloc_noprof (./include/linux/sched/mm.h:317 mm/slub.c:4636 mm/slub.c:4974 mm/slub.c:5413 mm/slub.c:5439)
[   20.057894][   T34]  __kmalloc_noprof (./include/linux/sched/mm.h:322 (discriminator 2) mm/slub.c:4636 (discriminator 2) mm/slub.c:4974 (discriminator 2) mm/slub.c:5413 (discriminator 2) mm/slub.c:5439 (discriminator 2))
[   20.057896][   T34]  ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   20.057902][   T34]  ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:58 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[   20.057905][   T34]  alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   20.057908][   T34]  put_chars (drivers/char/virtio_console.c:1176)
[   20.057911][   T34]  ? __send_to_port (drivers/char/virtio_console.c:654)
[   20.057913][   T34]  ? printk_get_next_message (kernel/printk/printk.c:3072)
[   20.057917][   T34]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[   20.057919][   T34]  ? validate_chain (kernel/locking/lockdep.c:3817 (discriminator 2) kernel/locking/lockdep.c:3837 (discriminator 2) kernel/locking/lockdep.c:3892 (discriminator 2))
[   20.057923][   T34]  hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2))
[   20.057927][   T34]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.057929][   T34]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.057933][   T34]  ? hvc_write (drivers/tty/hvc/hvc_console.c:501)
[   20.057937][   T34]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.057940][   T34]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   20.057944][   T34]  console_emit_next_record (kernel/printk/printk.c:3183)
[   20.057947][   T34]  ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20)
[   20.057952][   T34]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.057954][   T34]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   20.057958][   T34]  console_flush_one_record (kernel/printk/printk.c:3268)
[   20.057962][   T34]  ? console_emit_next_record (kernel/printk/printk.c:3150)
[   20.057963][   T34]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.057968][   T34]  console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420)
[   20.057971][   T34]  ? console_flush_one_record (kernel/printk/printk.c:3316)
[   20.057973][   T34]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.057975][   T34]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 18) ./include/trace/events/lock.h:23 (discriminator 18) kernel/locking/lockdep.c:5871 (discriminator 18))
[   20.057978][   T34]  ? __down_trylock_console_sem (kernel/printk/printk.c:334)
[   20.057980][   T34]  ? vprintk_emit (kernel/printk/printk.c:2478)
[   20.057983][   T34]  vprintk_emit (kernel/printk/printk.c:2479)
[   20.057987][   T34]  ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126))
[   20.057990][   T34]  ? wakeup_preempt_fair (kernel/sched/fair.c:1142 kernel/sched/fair.c:10033)
[   20.057995][   T34]  dev_vprintk_emit (drivers/base/core.c:5000)
[   20.058000][   T34]  ? device_rename.cold (drivers/base/core.c:4612 (discriminator 13))
[   20.058005][   T34]  ? _raw_spin_unlock_irq_enable (./include/linux/spinlock_api_smp.h:229 (discriminator 1) kernel/locking/spinlock.c:237 (discriminator 1))
[   20.058009][   T34]  ? try_to_wake_up (./include/linux/preempt.h:500 (discriminator 1) kernel/sched/core.c:4263 (discriminator 1))
[   20.058013][   T34]  dev_printk_emit (drivers/base/core.c:5011)
[   20.058015][   T34]  ? dev_vprintk_emit (drivers/base/core.c:5001)
[   20.058018][   T34]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   20.058021][   T34]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[   20.058026][   T34]  __netdev_printk (net/core/dev.c:13140 (discriminator 4))
[   20.058032][   T34]  netdev_printk (net/core/dev.c:13166)
[   20.058034][   T34]  ? __netdev_printk (net/core/dev.c:13151 (discriminator 1))
[   20.058036][   T34]  ? mark_held_locks (kernel/locking/lockdep.c:4341)
[   20.058040][   T34]  ? fbnic_mac_link_down_asic (drivers/net/ethernet/meta/fbnic/fbnic_mac.c:708)
[   20.058043][   T34]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4488)
[   20.058046][   T34]  ? queue_delayed_work_on (kernel/workqueue.c:2673 (discriminator 6))
[   20.058048][   T34]  ? fbnic_phylink_mac_link_down (drivers/net/ethernet/meta/fbnic/fbnic_phylink.c:156)
[   20.058052][   T34]  phylink_resolve (drivers/net/phy/phylink.c:1720)
[   20.058054][   T34]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.058058][   T34]  ? phylink_ethtool_ksettings_set (drivers/net/phy/phylink.c:189 (discriminator 1))
[   20.058062][   T34]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.058063][   T34]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.058065][   T34]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   20.058067][   T34]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.058071][   T34]  process_one_work (kernel/workqueue.c:3387)
[   20.058077][   T34]  ? __queue_delayed_work (kernel/workqueue.c:2622)
[   20.058080][   T34]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   20.058087][   T34]  worker_thread (kernel/workqueue.c:3470 kernel/workqueue.c:3551)
[   20.058094][   T34]  ? rescuer_thread (./include/linux/list.h:419 (discriminator 3))
[   20.058096][   T34]  kthread (kernel/kthread.c:436)
[   20.058098][   T34]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   20.058101][   T34]  ? kthread_affine_preferred (kernel/kthread.c:857)
[   20.058104][   T34]  ret_from_fork (arch/x86/kernel/process.c:158)
[   20.058108][   T34]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/vdso/vma.c:80 (discriminator 1))
[   20.058111][   T34]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   20.058114][   T34]  ? kthread_affine_preferred (kernel/kthread.c:857)


Finger prints:
__irq_exit_rcu:vprintk_emit:dump_stack_lvl:__kmalloc_noprof:put_chars