======================================
| [ 18.529294][ T45] #2: ffffffff8e5e7a48 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event (net/core/link_watch.c:282)
| [ 18.529628][ T45] #3: ffffffff8e5d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   18.530008][   T45]
| [   18.530008][   T45] stack backtrace:
[   18.530543][   T45] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.530788][   T45] Workqueue: events_unbound linkwatch_event
[   18.531023][   T45] Call Trace:
[   18.531169][   T45]  <TASK>
[ 18.531286][ T45] dump_stack_lvl (lib/dump_stack.c:123)
[ 18.531473][ T45] print_circular_bug (kernel/locking/lockdep.c:2077)
[ 18.531665][ T45] check_noncircular (kernel/locking/lockdep.c:2206)
[ 18.531843][ T45] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:406 arch/x86/kernel/unwind_orc.c:648)
[ 18.532042][ T45] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2182)
[ 18.532310][ T45] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:495)
[ 18.532493][ T45] ? alloc_chain_hlocks (kernel/locking/lockdep.c:3528)
[ 18.532755][ T45] check_prev_add (kernel/locking/lockdep.c:3162)
[ 18.532946][ T45] validate_chain (kernel/locking/lockdep.c:3281 kernel/locking/lockdep.c:3904)
[ 18.533133][ T45] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 18.533317][ 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)
[ 18.533491][ T45] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 18.533629][ T45] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 18.533827][ T45] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 18.534017][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.534199][ T45] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872)
[ 18.534379][ T45] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 18.534564][ T45] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 18.534758][ T45] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 18.534979][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.535163][ T45] __mutex_lock (kernel/locking/mutex.c:587 kernel/locking/mutex.c:735)
[ 18.535337][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.535515][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.535691][ T45] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 18.535866][ T45] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 18.536050][ T45] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 18.536279][ T45] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 18.536459][ T45] ? __pfx_fib_sync_up (net/ipv4/fib_semantics.c:2111)
[ 18.536647][ T45] ? __pfx_rwsem_read_trylock (kernel/locking/rwsem.c:249)
[ 18.536833][ T45] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.537012][ T45] team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 18.537198][ T45] team_device_event (drivers/net/team/team_core.c:3017)
[ 18.537382][ T45] ? trace_notifier_run (./include/trace/events/notifier.h:59 (discriminator 37))
[ 18.537562][ T45] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 18.537761][ T45] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 18.537939][ T45] netdev_state_change (net/core/dev.c:1381 net/core/dev.c:1372)
[ 18.538130][ T45] ? __pfx_netdev_state_change (net/core/dev.c:1373)
[ 18.538311][ T45] linkwatch_do_dev (net/core/link_watch.c:182)
[ 18.538494][ T45] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:241)
[ 18.538681][ T45] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:191)
[ 18.538998][ T45] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 18.539199][ T45] linkwatch_event (net/core/link_watch.c:283)
[ 18.539376][ T45] process_one_work (kernel/workqueue.c:3229)
[ 18.539554][ T45] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 18.539746][ T45] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 18.539928][ T45] ? assign_work (kernel/workqueue.c:1200)
[ 18.540114][ T45] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 18.540296][ T45] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 18.540769][ T45] kthread (kernel/kthread.c:389)
[ 18.540958][ T45] ? __pfx_kthread (kernel/kthread.c:342)
[ 18.541479][ T45] ret_from_fork (arch/x86/kernel/process.c:147)
[ 18.541733][ T45] ? __pfx_kthread (kernel/kthread.c:342)


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