======================================
| [ 18.778135][ T39] #2: ffffffff9dde7a48 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event (net/core/link_watch.c:282)
| [ 18.778424][ T39] #3: ffffffff9ddd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   18.778738][   T39]
| [   18.778738][   T39] stack backtrace:
[   18.779199][   T39] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.779396][   T39] Workqueue: events_unbound linkwatch_event
[   18.779589][   T39] Call Trace:
[   18.779723][   T39]  <TASK>
[ 18.779806][ T39] dump_stack_lvl (lib/dump_stack.c:123)
[ 18.779998][ T39] print_circular_bug (kernel/locking/lockdep.c:2077)
[ 18.780165][ T39] check_noncircular (kernel/locking/lockdep.c:2206)
[ 18.780316][ T39] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[ 18.780489][ T39] ? __bfs (kernel/locking/lockdep.c:1811 (discriminator 1))
[ 18.780624][ T39] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2182)
[ 18.780786][ T39] ? check_irq_usage (kernel/locking/lockdep.c:2828)
[ 18.780939][ T39] ? alloc_chain_hlocks (kernel/locking/lockdep.c:3528)
[ 18.781093][ T39] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2813)
[ 18.781246][ T39] check_prev_add (kernel/locking/lockdep.c:3162)
[ 18.781408][ T39] validate_chain (kernel/locking/lockdep.c:3281 kernel/locking/lockdep.c:3904)
[ 18.781571][ T39] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 18.781723][ T39] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228)
[ 18.781891][ T39] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 18.782015][ T39] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 18.782178][ T39] ? check_prev_add (kernel/locking/lockdep.c:3180)
[ 18.782335][ T39] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 18.782493][ T39] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.782655][ T39] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 18.782805][ T39] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 18.782966][ T39] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 18.783152][ T39] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.783322][ T39] __mutex_lock (kernel/locking/mutex.c:587 kernel/locking/mutex.c:735)
[ 18.783483][ T39] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.783644][ T39] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.783830][ T39] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 18.784004][ T39] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 18.784179][ T39] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 18.784374][ T39] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 18.784529][ T39] ? __pfx_fib_sync_up (net/ipv4/fib_semantics.c:2111)
[ 18.784707][ T39] ? __pfx_rwsem_read_trylock (kernel/locking/rwsem.c:249)
[ 18.784864][ T39] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.785020][ T39] team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.785174][ T39] team_device_event (drivers/net/team/team_core.c:3017)
[ 18.785333][ T39] ? trace_notifier_run (./include/trace/events/notifier.h:59 (discriminator 37))
[ 18.785526][ T39] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 18.785711][ T39] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 18.785875][ T39] netdev_state_change (net/core/dev.c:1381 net/core/dev.c:1372)
[ 18.786023][ T39] ? __pfx_netdev_state_change (net/core/dev.c:1373)
[ 18.786182][ T39] linkwatch_do_dev (net/core/link_watch.c:182)
[ 18.786366][ T39] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:241)
[ 18.786576][ T39] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:191)
[ 18.786768][ T39] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 18.786922][ T39] linkwatch_event (net/core/link_watch.c:283)
[ 18.787068][ T39] process_one_work (kernel/workqueue.c:3229)
[ 18.787226][ T39] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 18.787405][ T39] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 18.787558][ T39] ? assign_work (kernel/workqueue.c:1200)
[ 18.787861][ T39] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 18.788020][ T39] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 18.788193][ T39] kthread (kernel/kthread.c:389)
[ 18.788325][ T39] ? __pfx_kthread (kernel/kthread.c:342)
[ 18.788566][ T39] ret_from_fork (arch/x86/kernel/process.c:147)
[ 18.788775][ T39] ? __pfx_kthread (kernel/kthread.c:342)


Finger prints:
print_circular_bug:check_noncircular:check_prev_add:validate_chain:__lock_acquire