======================================
| [ 16.721667][ T45] #2: ffffffffbd9e7a48 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event (net/core/link_watch.c:282)
| [ 16.721926][ T45] #3: ffffffffbd9d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   16.722213][   T45]
| [   16.722213][   T45] stack backtrace:
[   16.722646][   T45] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.722816][   T45] Workqueue: events_unbound linkwatch_event
[   16.723014][   T45] Call Trace:
[   16.723126][   T45]  <TASK>
[ 16.723211][ T45] dump_stack_lvl (lib/dump_stack.c:123)
[ 16.723362][ T45] print_circular_bug (kernel/locking/lockdep.c:2077)
[ 16.723512][ T45] check_noncircular (kernel/locking/lockdep.c:2206)
[ 16.723650][ T45] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[ 16.723803][ T45] ? __bfs (kernel/locking/lockdep.c:1811 (discriminator 1))
[ 16.723922][ T45] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2182)
[ 16.724065][ T45] ? check_irq_usage (kernel/locking/lockdep.c:2828)
[ 16.724216][ T45] ? alloc_chain_hlocks (kernel/locking/lockdep.c:3528)
[ 16.724352][ T45] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2813)
[ 16.724490][ T45] check_prev_add (kernel/locking/lockdep.c:3162)
[ 16.724722][ T45] validate_chain (kernel/locking/lockdep.c:3281 kernel/locking/lockdep.c:3904)
[ 16.724875][ T45] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 16.725020][ T45] ? 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)
[ 16.725161][ T45] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 16.725363][ T45] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 16.725509][ T45] ? check_prev_add (kernel/locking/lockdep.c:3180)
[ 16.725657][ T45] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 16.725793][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 16.726028][ T45] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 16.726179][ T45] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 16.726319][ T45] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 16.726460][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 16.726684][ T45] __mutex_lock (kernel/locking/mutex.c:587 kernel/locking/mutex.c:735)
[ 16.726828][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 16.726980][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 16.727119][ T45] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 16.727342][ T45] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 16.727485][ T45] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 16.727656][ T45] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 16.727804][ T45] ? __pfx_fib_sync_up (net/ipv4/fib_semantics.c:2111)
[ 16.728046][ T45] ? __pfx_rwsem_read_trylock (kernel/locking/rwsem.c:249)
[ 16.728198][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 16.728355][ T45] team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 16.728510][ T45] team_device_event (drivers/net/team/team_core.c:3017)
[ 16.728722][ T45] ? trace_notifier_run (./include/trace/events/notifier.h:59 (discriminator 37))
[ 16.728860][ T45] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 16.729001][ T45] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 16.729136][ T45] netdev_state_change (net/core/dev.c:1381 net/core/dev.c:1372)
[ 16.729352][ T45] ? __pfx_netdev_state_change (net/core/dev.c:1373)
[ 16.729492][ T45] linkwatch_do_dev (net/core/link_watch.c:182)
[ 16.729631][ T45] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:241)
[ 16.729768][ T45] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:191)
[ 16.730017][ T45] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 16.730162][ T45] linkwatch_event (net/core/link_watch.c:283)
[ 16.730297][ T45] process_one_work (kernel/workqueue.c:3229)
[ 16.730513][ T45] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 16.730693][ T45] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 16.730853][ T45] ? assign_work (kernel/workqueue.c:1200)
[ 16.731010][ T45] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 16.731245][ T45] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 16.731401][ T45] kthread (kernel/kthread.c:389)
[ 16.731507][ T45] ? __pfx_kthread (kernel/kthread.c:342)
[ 16.731644][ T45] ret_from_fork (arch/x86/kernel/process.c:147)
[ 16.731786][ T45] ? __pfx_kthread (kernel/kthread.c:342)


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