======================================
| [   22.191995][   T75] softirqs last disabled at (0): 0x0
| [   22.191999][   T75] Preemption disabled at:
| [   22.192000][   T75] vprintk_emit (kernel/printk/printk.c:2471)
| [   22.192009][   T75] Tainted: [W]=WARN
[   22.192010][   T75] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   22.192012][   T75] Workqueue: events_power_efficient phylink_resolve
[   22.192015][   T75] Call Trace:
[   22.192017][   T75]  <TASK>
[   22.192019][   T75]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   22.192025][   T75]  ? vprintk_emit (kernel/printk/printk.c:2471)
[   22.192027][   T75]  __might_resched.cold (kernel/sched/core.c:9234)
[   22.192032][   T75]  ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3))
[   22.192036][   T75]  ? __kmalloc_noprof (./include/linux/sched/mm.h:317 mm/slub.c:4636 mm/slub.c:4974 mm/slub.c:5413 mm/slub.c:5439)
[   22.192041][   T75]  __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))
[   22.192044][   T75]  ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   22.192049][   T75]  ? 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)
[   22.192052][   T75]  alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   22.192056][   T75]  put_chars (drivers/char/virtio_console.c:1176)
[   22.192059][   T75]  ? __send_to_port (drivers/char/virtio_console.c:654)
[   22.192061][   T75]  ? printk_get_next_message (kernel/printk/printk.c:3072)
[   22.192064][   T75]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[   22.192067][   T75]  ? validate_chain (kernel/locking/lockdep.c:3817 (discriminator 2) kernel/locking/lockdep.c:3837 (discriminator 2) kernel/locking/lockdep.c:3892 (discriminator 2))
[   22.192071][   T75]  hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2))
[   22.192075][   T75]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   22.192076][   T75]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   22.192081][   T75]  ? hvc_write (drivers/tty/hvc/hvc_console.c:501)
[   22.192084][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   22.192087][   T75]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   22.192091][   T75]  console_emit_next_record (kernel/printk/printk.c:3183)
[   22.192095][   T75]  ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20)
[   22.192101][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   22.192103][   T75]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   22.192107][   T75]  console_flush_one_record (kernel/printk/printk.c:3268)
[   22.192111][   T75]  ? console_emit_next_record (kernel/printk/printk.c:3150)
[   22.192113][   T75]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   22.192118][   T75]  console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420)
[   22.192121][   T75]  ? console_flush_one_record (kernel/printk/printk.c:3316)
[   22.192123][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   22.192125][   T75]  ? 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))
[   22.192128][   T75]  ? __down_trylock_console_sem (kernel/printk/printk.c:334)
[   22.192130][   T75]  ? vprintk_emit (kernel/printk/printk.c:2478)
[   22.192133][   T75]  vprintk_emit (kernel/printk/printk.c:2479)
[   22.192137][   T75]  ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126))
[   22.192140][   T75]  ? wakeup_preempt_fair (kernel/sched/fair.c:1142 kernel/sched/fair.c:10033)
[   22.192145][   T75]  dev_vprintk_emit (drivers/base/core.c:5000)
[   22.192150][   T75]  ? device_rename.cold (drivers/base/core.c:4612 (discriminator 13))
[   22.192155][   T75]  ? _raw_spin_unlock_irq_enable (./include/linux/spinlock_api_smp.h:229 (discriminator 1) kernel/locking/spinlock.c:237 (discriminator 1))
[   22.192160][   T75]  ? try_to_wake_up (./include/linux/preempt.h:500 (discriminator 1) kernel/sched/core.c:4263 (discriminator 1))
[   22.192164][   T75]  dev_printk_emit (drivers/base/core.c:5011)
[   22.192166][   T75]  ? dev_vprintk_emit (drivers/base/core.c:5001)
[   22.192169][   T75]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   22.192172][   T75]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[   22.192177][   T75]  __netdev_printk (net/core/dev.c:13140 (discriminator 4))
[   22.192183][   T75]  netdev_printk (net/core/dev.c:13166)
[   22.192185][   T75]  ? __netdev_printk (net/core/dev.c:13151 (discriminator 1))
[   22.192188][   T75]  ? mark_held_locks (kernel/locking/lockdep.c:4341)
[   22.192191][   T75]  ? fbnic_mac_link_down_asic (drivers/net/ethernet/meta/fbnic/fbnic_mac.c:708)
[   22.192195][   T75]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4488)
[   22.192198][   T75]  ? queue_delayed_work_on (kernel/workqueue.c:2673 (discriminator 6))
[   22.192201][   T75]  ? fbnic_phylink_mac_link_down (drivers/net/ethernet/meta/fbnic/fbnic_phylink.c:156)
[   22.192205][   T75]  phylink_resolve (drivers/net/phy/phylink.c:1720)
[   22.192207][   T75]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   22.192210][   T75]  ? phylink_ethtool_ksettings_set (drivers/net/phy/phylink.c:189 (discriminator 1))
[   22.192214][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   22.192216][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   22.192218][   T75]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   22.192220][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   22.192229][   T75]  process_one_work (kernel/workqueue.c:3387)
[   22.192235][   T75]  ? __queue_delayed_work (kernel/workqueue.c:2622)
[   22.192238][   T75]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   22.192245][   T75]  worker_thread (kernel/workqueue.c:3470 kernel/workqueue.c:3551)
[   22.192253][   T75]  ? rescuer_thread (./include/linux/list.h:419 (discriminator 3))
[   22.192255][   T75]  kthread (kernel/kthread.c:436)
[   22.192257][   T75]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   22.192261][   T75]  ? kthread_affine_preferred (kernel/kthread.c:857)
[   22.192263][   T75]  ret_from_fork (arch/x86/kernel/process.c:158)
[   22.192267][   T75]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/vdso/vma.c:80 (discriminator 1))
[   22.192270][   T75]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   22.192274][   T75]  ? kthread_affine_preferred (kernel/kthread.c:857)


Finger prints:
vprintk_emit:dump_stack_lvl:__kmalloc_noprof:put_chars:hvc_console_print