======================================
| [   20.945496][   T68] softirqs last disabled at (319): __irq_exit_rcu (kernel/softirq.c:679 kernel/softirq.c:519 kernel/softirq.c:767)
| [   20.945498][   T68] Preemption disabled at:
| [   20.945499][   T68] vprintk_emit (kernel/printk/printk.c:2471)
| [   20.945507][   T68] Tainted: [W]=WARN
[   20.945508][   T68] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   20.945510][   T68] Workqueue: events_power_efficient phylink_resolve
[   20.945513][   T68] Call Trace:
[   20.945515][   T68]  <TASK>
[   20.945518][   T68]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   20.945523][   T68]  ? vprintk_emit (kernel/printk/printk.c:2471)
[   20.945525][   T68]  __might_resched.cold (kernel/sched/core.c:9234)
[   20.945530][   T68]  ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3))
[   20.945534][   T68]  ? __kmalloc_noprof (./include/linux/sched/mm.h:317 mm/slub.c:4636 mm/slub.c:4974 mm/slub.c:5413 mm/slub.c:5439)
[   20.945539][   T68]  __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))
[   20.945541][   T68]  ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   20.945548][   T68]  ? 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)
[   20.945550][   T68]  alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429)
[   20.945554][   T68]  put_chars (drivers/char/virtio_console.c:1176)
[   20.945558][   T68]  ? __send_to_port (drivers/char/virtio_console.c:654)
[   20.945560][   T68]  ? printk_get_next_message (kernel/printk/printk.c:3072)
[   20.945563][   T68]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[   20.945566][   T68]  ? validate_chain (kernel/locking/lockdep.c:3817 (discriminator 2) kernel/locking/lockdep.c:3837 (discriminator 2) kernel/locking/lockdep.c:3892 (discriminator 2))
[   20.945570][   T68]  hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2))
[   20.945573][   T68]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.945575][   T68]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.945579][   T68]  ? hvc_write (drivers/tty/hvc/hvc_console.c:501)
[   20.945583][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.945586][   T68]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   20.945589][   T68]  console_emit_next_record (kernel/printk/printk.c:3183)
[   20.945593][   T68]  ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20)
[   20.945598][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.945600][   T68]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   20.945604][   T68]  console_flush_one_record (kernel/printk/printk.c:3268)
[   20.945608][   T68]  ? console_emit_next_record (kernel/printk/printk.c:3150)
[   20.945610][   T68]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.945615][   T68]  console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420)
[   20.945618][   T68]  ? console_flush_one_record (kernel/printk/printk.c:3316)
[   20.945619][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.945621][   T68]  ? 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))
[   20.945625][   T68]  ? __down_trylock_console_sem (kernel/printk/printk.c:334)
[   20.945627][   T68]  ? vprintk_emit (kernel/printk/printk.c:2478)
[   20.945630][   T68]  vprintk_emit (kernel/printk/printk.c:2479)
[   20.945634][   T68]  ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126))
[   20.945637][   T68]  ? find_held_lock (kernel/locking/lockdep.c:5367)
[   20.945641][   T68]  dev_vprintk_emit (drivers/base/core.c:5000)
[   20.945647][   T68]  ? device_rename.cold (drivers/base/core.c:4612 (discriminator 13))
[   20.945652][   T68]  ? clockevents_program_event (kernel/time/clockevents.c:372)
[   20.945658][   T68]  dev_printk_emit (drivers/base/core.c:5011)
[   20.945660][   T68]  ? dev_vprintk_emit (drivers/base/core.c:5001)
[   20.945665][   T68]  ? mark_held_locks (kernel/locking/lockdep.c:4341)
[   20.945669][   T68]  __netdev_printk (net/core/dev.c:13140 (discriminator 4))
[   20.945675][   T68]  netdev_printk (net/core/dev.c:13166)
[   20.945678][   T68]  ? __netdev_printk (net/core/dev.c:13151 (discriminator 1))
[   20.945682][   T68]  ? fbnic_mac_link_down_asic (drivers/net/ethernet/meta/fbnic/fbnic_mac.c:708)
[   20.945686][   T68]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4488)
[   20.945690][   T68]  ? queue_delayed_work_on (kernel/workqueue.c:2673 (discriminator 6))
[   20.945692][   T68]  ? fbnic_phylink_mac_link_down (drivers/net/ethernet/meta/fbnic/fbnic_phylink.c:156)
[   20.945696][   T68]  phylink_resolve (drivers/net/phy/phylink.c:1720)
[   20.945698][   T68]  ? __lock_acquire (kernel/locking/lockdep.c:5254)
[   20.945702][   T68]  ? phylink_ethtool_ksettings_set (drivers/net/phy/phylink.c:189 (discriminator 1))
[   20.945705][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.945707][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.945709][   T68]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22))
[   20.945711][   T68]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3))
[   20.945715][   T68]  process_one_work (kernel/workqueue.c:3387)
[   20.945721][   T68]  ? __queue_delayed_work (kernel/workqueue.c:2622)
[   20.945724][   T68]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5908 (discriminator 2))
[   20.945731][   T68]  worker_thread (kernel/workqueue.c:3470 kernel/workqueue.c:3551)
[   20.945738][   T68]  ? rescuer_thread (./include/linux/list.h:419 (discriminator 3))
[   20.945740][   T68]  kthread (kernel/kthread.c:436)
[   20.945742][   T68]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   20.945745][   T68]  ? kthread_affine_preferred (kernel/kthread.c:857)
[   20.945748][   T68]  ret_from_fork (arch/x86/kernel/process.c:158)
[   20.945752][   T68]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/vdso/vma.c:80 (discriminator 1))
[   20.945755][   T68]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   20.945758][   T68]  ? kthread_affine_preferred (kernel/kthread.c:857)


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