======================================
| [   49.390470][   T39] softirqs last disabled at (115): __irq_exit_rcu (kernel/softirq.c:679 kernel/softirq.c:519 kernel/softirq.c:767)
| [   49.390472][   T39] Preemption disabled at:
| [   49.390473][   T39] vprintk_emit (kernel/printk/printk.c:2471)
| [   49.390483][   T39] Tainted: [W]=WARN
[   49.390483][   T39] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   49.390485][   T39] Workqueue: events_power_efficient phylink_resolve
[   49.390488][   T39] Call Trace:
[   49.390491][   T39]  <TASK>
[   49.390493][   T39]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   49.390498][   T39]  ? vprintk_emit (kernel/printk/printk.c:2471)
[   49.390500][   T39]  __might_resched.cold (kernel/sched/core.c:9234)
[   49.390505][   T39]  ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3))
[   49.390509][   T39]  ? __kmalloc_noprof (./include/linux/sched/mm.h:317 mm/slub.c:4636 mm/slub.c:4974 mm/slub.c:5413 mm/slub.c:5439)
[   49.390514][   T39]  __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))
[   49.390516][   T39]  ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   49.390522][   T39]  ? 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)
[   49.390525][   T39]  alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   49.390528][   T39]  put_chars (drivers/char/virtio_console.c:1176)
[   49.390532][   T39]  ? __send_to_port (drivers/char/virtio_console.c:654)
[   49.390533][   T39]  ? printk_get_next_message (kernel/printk/printk.c:3072)
[   49.390537][   T39]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[   49.390539][   T39]  ? validate_chain (kernel/locking/lockdep.c:3817 (discriminator 2) kernel/locking/lockdep.c:3837 (discriminator 2) kernel/locking/lockdep.c:3892 (discriminator 2))
[   49.390544][   T39]  hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2))
[   49.390547][   T39]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   49.390549][   T39]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   49.390553][   T39]  ? hvc_write (drivers/tty/hvc/hvc_console.c:501)
[   49.390557][   T39]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   49.390559][   T39]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   49.390563][   T39]  console_emit_next_record (kernel/printk/printk.c:3183)
[   49.390567][   T39]  ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20)
[   49.390572][   T39]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   49.390574][   T39]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   49.390578][   T39]  console_flush_one_record (kernel/printk/printk.c:3268)
[   49.390582][   T39]  ? console_emit_next_record (kernel/printk/printk.c:3150)
[   49.390584][   T39]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   49.390589][   T39]  console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420)
[   49.390591][   T39]  ? console_flush_one_record (kernel/printk/printk.c:3316)
[   49.390593][   T39]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   49.390595][   T39]  ? 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))
[   49.390599][   T39]  ? __down_trylock_console_sem (kernel/printk/printk.c:334)
[   49.390600][   T39]  ? vprintk_emit (kernel/printk/printk.c:2478)
[   49.390604][   T39]  vprintk_emit (kernel/printk/printk.c:2479)
[   49.390608][   T39]  ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126))
[   49.390610][   T39]  ? wakeup_preempt_fair (kernel/sched/fair.c:6515 kernel/sched/fair.c:10016)
[   49.390616][   T39]  dev_vprintk_emit (drivers/base/core.c:5000)
[   49.390621][   T39]  ? device_rename.cold (drivers/base/core.c:4612 (discriminator 13))
[   49.390626][   T39]  ? try_to_wake_up (./include/linux/preempt.h:500 (discriminator 5) kernel/sched/core.c:4263 (discriminator 5))
[   49.390630][   T39]  dev_printk_emit (drivers/base/core.c:5011)
[   49.390633][   T39]  ? dev_vprintk_emit (drivers/base/core.c:5001)
[   49.390636][   T39]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   49.390639][   T39]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5554)
[   49.390643][   T39]  __netdev_printk (net/core/dev.c:13140 (discriminator 4))
[   49.390649][   T39]  netdev_printk (net/core/dev.c:13166)
[   49.390652][   T39]  ? __netdev_printk (net/core/dev.c:13151 (discriminator 1))
[   49.390653][   T39]  ? trace_irq_enable.constprop.0 (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 ./include/linux/cpumask.h:650 ./include/linux/cpumask.h:1232 ./include/trace/events/preemptirq.h:40)
[   49.390659][   T39]  ? fbnic_mac_link_down_asic (drivers/net/ethernet/meta/fbnic/fbnic_mac.c:708)
[   49.390663][   T39]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4488)
[   49.390667][   T39]  ? queue_delayed_work_on (kernel/workqueue.c:2673 (discriminator 6))
[   49.390669][   T39]  ? fbnic_phylink_mac_link_down (drivers/net/ethernet/meta/fbnic/fbnic_phylink.c:156)
[   49.390673][   T39]  phylink_resolve (drivers/net/phy/phylink.c:1720)
[   49.390674][   T39]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   49.390678][   T39]  ? phylink_ethtool_ksettings_set (drivers/net/phy/phylink.c:189 (discriminator 1))
[   49.390682][   T39]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   49.390684][   T39]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   49.390686][   T39]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   49.390688][   T39]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   49.390691][   T39]  process_one_work (kernel/workqueue.c:3387)
[   49.390698][   T39]  ? __queue_delayed_work (kernel/workqueue.c:2622)
[   49.390701][   T39]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   49.390707][   T39]  worker_thread (kernel/workqueue.c:3470 kernel/workqueue.c:3551)
[   49.390714][   T39]  ? rescuer_thread (./include/linux/list.h:419 (discriminator 3))
[   49.390716][   T39]  kthread (kernel/kthread.c:436)
[   49.390719][   T39]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   49.390720][   T39]  ? kthread_affine_preferred (kernel/kthread.c:857)
[   49.390728][   T39]  ret_from_fork (arch/x86/kernel/process.c:158)
[   49.390732][   T39]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/vdso/vma.c:80 (discriminator 1))
[   49.390735][   T39]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   49.390738][   T39]  ? kthread_affine_preferred (kernel/kthread.c:857)


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