======================================
| [   19.544102][   T75] softirqs last disabled at (50): srcu_invoke_callbacks (./include/linux/bottom_half.h:20 (discriminator 2) kernel/rcu/srcutree.c:1897 (discriminator 2))
| [   19.544104][   T75] Preemption disabled at:
| [   19.544105][   T75] vprintk_emit (kernel/printk/printk.c:2471)
| [   19.544114][   T75] Tainted: [W]=WARN
[   19.544115][   T75] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   19.544117][   T75] Workqueue: events_power_efficient phylink_resolve
[   19.544120][   T75] Call Trace:
[   19.544122][   T75]  <TASK>
[   19.544124][   T75]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   19.544130][   T75]  ? vprintk_emit (kernel/printk/printk.c:2471)
[   19.544132][   T75]  __might_resched.cold (kernel/sched/core.c:9234)
[   19.544136][   T75]  ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3))
[   19.544140][   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)
[   19.544145][   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))
[   19.544148][   T75]  ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   19.544154][   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)
[   19.544156][   T75]  alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   19.544160][   T75]  put_chars (drivers/char/virtio_console.c:1176)
[   19.544163][   T75]  ? __send_to_port (drivers/char/virtio_console.c:654)
[   19.544165][   T75]  ? printk_get_next_message (kernel/printk/printk.c:3072)
[   19.544169][   T75]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[   19.544171][   T75]  ? validate_chain (kernel/locking/lockdep.c:3817 (discriminator 2) kernel/locking/lockdep.c:3837 (discriminator 2) kernel/locking/lockdep.c:3892 (discriminator 2))
[   19.544175][   T75]  hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2))
[   19.544178][   T75]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   19.544180][   T75]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   19.544184][   T75]  ? hvc_write (drivers/tty/hvc/hvc_console.c:501)
[   19.544188][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   19.544190][   T75]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   19.544194][   T75]  console_emit_next_record (kernel/printk/printk.c:3183)
[   19.544198][   T75]  ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20)
[   19.544203][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   19.544205][   T75]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   19.544209][   T75]  console_flush_one_record (kernel/printk/printk.c:3268)
[   19.544213][   T75]  ? console_emit_next_record (kernel/printk/printk.c:3150)
[   19.544215][   T75]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   19.544220][   T75]  console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420)
[   19.544223][   T75]  ? console_flush_one_record (kernel/printk/printk.c:3316)
[   19.544224][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   19.544227][   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))
[   19.544230][   T75]  ? __down_trylock_console_sem (kernel/printk/printk.c:334)
[   19.544232][   T75]  ? vprintk_emit (kernel/printk/printk.c:2478)
[   19.544235][   T75]  vprintk_emit (kernel/printk/printk.c:2479)
[   19.544239][   T75]  ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126))
[   19.544241][   T75]  ? wakeup_preempt_fair (kernel/sched/fair.c:1142 kernel/sched/fair.c:10033)
[   19.544247][   T75]  dev_vprintk_emit (drivers/base/core.c:5000)
[   19.544252][   T75]  ? device_rename.cold (drivers/base/core.c:4612 (discriminator 13))
[   19.544257][   T75]  ? _raw_spin_unlock_irq_enable (./include/linux/spinlock_api_smp.h:229 (discriminator 1) kernel/locking/spinlock.c:237 (discriminator 1))
[   19.544261][   T75]  ? try_to_wake_up (./include/linux/preempt.h:500 (discriminator 1) kernel/sched/core.c:4263 (discriminator 1))
[   19.544265][   T75]  dev_printk_emit (drivers/base/core.c:5011)
[   19.544268][   T75]  ? dev_vprintk_emit (drivers/base/core.c:5001)
[   19.544271][   T75]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   19.544273][   T75]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[   19.544278][   T75]  __netdev_printk (net/core/dev.c:13140 (discriminator 4))
[   19.544284][   T75]  netdev_printk (net/core/dev.c:13166)
[   19.544287][   T75]  ? __netdev_printk (net/core/dev.c:13151 (discriminator 1))
[   19.544289][   T75]  ? mark_held_locks (kernel/locking/lockdep.c:4341)
[   19.544293][   T75]  ? fbnic_mac_link_down_asic (drivers/net/ethernet/meta/fbnic/fbnic_mac.c:708)
[   19.544296][   T75]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4488)
[   19.544299][   T75]  ? queue_delayed_work_on (kernel/workqueue.c:2673 (discriminator 6))
[   19.544301][   T75]  ? fbnic_phylink_mac_link_down (drivers/net/ethernet/meta/fbnic/fbnic_phylink.c:156)
[   19.544305][   T75]  phylink_resolve (drivers/net/phy/phylink.c:1720)
[   19.544307][   T75]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   19.544311][   T75]  ? phylink_ethtool_ksettings_set (drivers/net/phy/phylink.c:189 (discriminator 1))
[   19.544315][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   19.544316][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   19.544318][   T75]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   19.544320][   T75]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   19.544324][   T75]  process_one_work (kernel/workqueue.c:3387)
[   19.544337][   T75]  ? __queue_delayed_work (kernel/workqueue.c:2622)
[   19.544340][   T75]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5908 (discriminator 2))
[   19.544347][   T75]  worker_thread (kernel/workqueue.c:3470 kernel/workqueue.c:3551)
[   19.544351][   T75]  ? rescuer_thread (./include/linux/list.h:419 (discriminator 3))
[   19.544353][   T75]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   19.544356][   T75]  ? rescuer_thread (./include/linux/list.h:419 (discriminator 3))
[   19.544359][   T75]  ? rescuer_thread (./include/linux/list.h:419 (discriminator 3))
[   19.544361][   T75]  kthread (kernel/kthread.c:436)
[   19.544362][   T75]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   19.544366][   T75]  ? kthread_affine_preferred (kernel/kthread.c:857)
[   19.544368][   T75]  ret_from_fork (arch/x86/kernel/process.c:158)
[   19.544372][   T75]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/vdso/vma.c:80 (discriminator 1))
[   19.544375][   T75]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   19.544378][   T75]  ? kthread_affine_preferred (kernel/kthread.c:857)


Finger prints:
srcu_invoke_callbacks:vprintk_emit:dump_stack_lvl:__kmalloc_noprof:put_chars