======================================
| [  482.427441][    C0] 1 lock held by ksoftirqd/0/14:
| [  482.427509][    C0]  #0: ffffffff9df77c00 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:300 (discriminator 2) kernel/rcu/tree.c:2611 (discriminator 2))
| [  482.427634][    C0]
| [  482.427634][    C0] stack backtrace:
[  482.427726][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  482.427728][    C0] Call Trace:
[  482.427729][    C0]  <TASK>
[  482.427731][    C0]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  482.427736][    C0]  print_usage_bug.part.0.cold (kernel/locking/lockdep.c:4042)
[  482.427739][    C0]  mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4056 kernel/locking/lockdep.c:4267)
[  482.427741][    C0]  ? kthread (kernel/kthread.c:436)
[  482.427744][    C0]  ? save_trace (kernel/locking/lockdep.c:589)
[  482.427745][    C0]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  482.427747][    C0]  mark_lock (kernel/locking/lockdep.c:4753)
[  482.427749][    C0]  mark_usage (kernel/locking/lockdep.c:4642)
[  482.427750][    C0]  __lock_acquire (kernel/locking/lockdep.c:5191)
[  482.427752][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  482.427755][    C0]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  482.427756][    C0]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[  482.427758][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  482.427760][    C0]  ? lock_acquire (./include/trace/events/lock.h:24 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[  482.427762][    C0]  _raw_spin_lock (./include/linux/spinlock_api_smp.h:158 (discriminator 1) kernel/locking/spinlock.c:158 (discriminator 1))
[  482.427764][    C0]  ? tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[  482.427765][    C0] tcf_mirred_release (./include/linux/spinlock.h:342 net/sched/act_mirred.c:78) act_mirred
[  482.427767][    C0]  tcf_action_rcu_free (net/sched/act_api.c:367 net/sched/act_api.c:378)
[  482.427769][    C0]  ? rcu_do_batch (./include/linux/rcupdate.h:310 (discriminator 2) kernel/rcu/tree.c:2619 (discriminator 2))
[  482.427770][    C0]  rcu_do_batch (kernel/rcu/tree.c:2617)
[  482.427773][    C0]  ? rcu_start_this_gp (kernel/rcu/tree.c:1040 (discriminator 1))
[  482.427775][    C0]  ? trace_rcu_batch_end (./include/trace/events/rcu.h:714 (discriminator 19))
[  482.427777][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  482.427779][    C0]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  482.427782][    C0]  ? trace_irq_disable.constprop.0 (./include/trace/events/preemptirq.h:36 (discriminator 22))
[  482.427783][    C0]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  482.427785][    C0]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  482.427788][    C0]  rcu_core (kernel/rcu/tree.c:2869)
[  482.427789][    C0]  handle_softirqs (kernel/softirq.c:622)
[  482.427791][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  482.427794][    C0]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[  482.427796][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  482.427798][    C0]  run_ksoftirqd (kernel/softirq.c:1076 kernel/softirq.c:1068)
[  482.427799][    C0]  smpboot_thread_fn (kernel/smpboot.c:160)
[  482.427802][    C0]  ? sort_range (kernel/range.c:164)
[  482.427803][    C0]  kthread (kernel/kthread.c:436)
[  482.427805][    C0]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  482.427807][    C0]  ? kthread_affine_node (kernel/kthread.c:378)
[  482.427808][    C0]  ret_from_fork (arch/x86/kernel/process.c:158)
[  482.427811][    C0]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[  482.427813][    C0]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[  482.427816][    C0]  ? kthread_affine_node (kernel/kthread.c:378)


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock