======================================
| [ 18.782871][ T255] #2: ffffffff911e7a48 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event (net/core/link_watch.c:282)
| [ 18.783150][ T255] #3: ffffffff911d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   18.783479][  T255]
| [   18.783479][  T255] stack backtrace:
[   18.783943][  T255] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.784145][  T255] Workqueue: events_unbound linkwatch_event
[   18.784422][  T255] Call Trace:
[   18.784547][  T255]  <TASK>
[ 18.784629][ T255] dump_stack_lvl (lib/dump_stack.c:123)
[ 18.784789][ T255] print_circular_bug (kernel/locking/lockdep.c:2077)
[ 18.784948][ T255] check_noncircular (kernel/locking/lockdep.c:2206)
[ 18.785134][ T255] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 18.785376][ T255] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2182)
[ 18.785609][ T255] ? trace_ipi_send_cpu.constprop.0 (./include/trace/events/ipi.h:38)
[ 18.785813][ T255] ? alloc_chain_hlocks (kernel/locking/lockdep.c:3528)
[ 18.785969][ T255] check_prev_add (kernel/locking/lockdep.c:3162)
[ 18.786129][ T255] validate_chain (kernel/locking/lockdep.c:3281 kernel/locking/lockdep.c:3904)
[ 18.786336][ T255] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[ 18.786510][ T255] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 18.786668][ T255] ? 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)
[ 18.786820][ T255] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 18.786946][ T255] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[ 18.787103][ T255] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 18.787276][ T255] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 18.787432][ T255] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.787587][ T255] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872)
[ 18.787748][ T255] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 18.787906][ T255] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 18.788068][ T255] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 18.788239][ T255] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.788398][ T255] __mutex_lock (kernel/locking/mutex.c:587 kernel/locking/mutex.c:735)
[ 18.788556][ T255] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.788713][ T255] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.788869][ T255] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 18.789026][ T255] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 18.789190][ T255] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 18.789412][ T255] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 18.789578][ T255] ? __pfx_fib_sync_up (net/ipv4/fib_semantics.c:2111)
[ 18.789741][ T255] ? __pfx_rwsem_read_trylock (kernel/locking/rwsem.c:249)
[ 18.789904][ T255] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.790059][ T255] team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.790223][ T255] team_device_event (drivers/net/team/team_core.c:3017)
[ 18.790384][ T255] ? trace_notifier_run (./include/trace/events/notifier.h:59 (discriminator 37))
[ 18.790542][ T255] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 18.790703][ T255] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 18.790853][ T255] netdev_state_change (net/core/dev.c:1381 net/core/dev.c:1372)
[ 18.791011][ T255] ? __pfx_netdev_state_change (net/core/dev.c:1373)
[ 18.791176][ T255] linkwatch_do_dev (net/core/link_watch.c:182)
[ 18.791341][ T255] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:241)
[ 18.791505][ T255] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:191)
[ 18.791696][ T255] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 18.791854][ T255] linkwatch_event (net/core/link_watch.c:283)
[ 18.792015][ T255] process_one_work (kernel/workqueue.c:3229)
[ 18.792181][ T255] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 18.792394][ T255] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 18.792584][ T255] ? assign_work (kernel/workqueue.c:1200)
[ 18.792773][ T255] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 18.792968][ T255] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 18.793242][ T255] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 18.793478][ T255] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 18.793714][ T255] kthread (kernel/kthread.c:389)
[ 18.793834][ T255] ? __pfx_kthread (kernel/kthread.c:342)
[ 18.793993][ T255] ret_from_fork (arch/x86/kernel/process.c:147)
[ 18.794163][ T255] ? __pfx_kthread (kernel/kthread.c:342)


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