======================================
| [ 17.538155][ T37] #2: ffffffffa43e7a48 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event (net/core/link_watch.c:282)
| [ 17.538518][ T37] #3: ffffffffa43d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   17.538914][   T37]
| [   17.538914][   T37] stack backtrace:
[   17.539444][   T37] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.539621][   T37] Workqueue: events_unbound linkwatch_event
[   17.539803][   T37] Call Trace:
[   17.539913][   T37]  <TASK>
[ 17.539993][ T37] dump_stack_lvl (lib/dump_stack.c:123)
[ 17.540139][ T37] print_circular_bug (kernel/locking/lockdep.c:2077)
[ 17.540290][ T37] check_noncircular (kernel/locking/lockdep.c:2206)
[ 17.540436][ T37] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2182)
[ 17.540587][ T37] ? __bfs (kernel/locking/lockdep.c:1811 (discriminator 1))
[ 17.540693][ T37] ? __pfx_usage_accumulate (kernel/locking/lockdep.c:2256)
[ 17.540835][ T37] ? alloc_chain_hlocks (kernel/locking/lockdep.c:3528)
[ 17.540976][ T37] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:406 arch/x86/kernel/unwind_orc.c:648)
[ 17.541124][ T37] check_prev_add (kernel/locking/lockdep.c:3162)
[ 17.541276][ T37] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:257)
[ 17.541423][ T37] validate_chain (kernel/locking/lockdep.c:3281 kernel/locking/lockdep.c:3904)
[ 17.541574][ T37] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:257)
[ 17.541725][ T37] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 17.541865][ T37] ? 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)
[ 17.542007][ T37] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 17.542116][ T37] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 17.542259][ T37] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 17.542407][ T37] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 17.542545][ T37] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872)
[ 17.542690][ T37] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 17.542847][ T37] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 17.542989][ T37] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 17.543138][ T37] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 17.543289][ T37] __mutex_lock (kernel/locking/mutex.c:587 kernel/locking/mutex.c:735)
[ 17.543436][ T37] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 17.543585][ T37] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 17.543736][ T37] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 17.543883][ T37] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 17.544039][ T37] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 17.544232][ T37] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 17.544377][ T37] ? __pfx_fib_sync_up (net/ipv4/fib_semantics.c:2111)
[ 17.544529][ T37] ? __pfx_rwsem_read_trylock (kernel/locking/rwsem.c:249)
[ 17.544676][ T37] ? team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 17.544828][ T37] team_port_change_check (drivers/net/team/team_core.c:2939 drivers/net/team/team_core.c:2962)
[ 17.544977][ T37] team_device_event (drivers/net/team/team_core.c:3017)
[ 17.545131][ T37] ? trace_notifier_run (./include/trace/events/notifier.h:59 (discriminator 37))
[ 17.545288][ T37] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 17.545448][ T37] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 17.545603][ T37] netdev_state_change (net/core/dev.c:1381 net/core/dev.c:1372)
[ 17.545748][ T37] ? __pfx_netdev_state_change (net/core/dev.c:1373)
[ 17.545893][ T37] linkwatch_do_dev (net/core/link_watch.c:182)
[ 17.546035][ T37] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:241)
[ 17.546176][ T37] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:191)
[ 17.546351][ T37] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 17.546491][ T37] linkwatch_event (net/core/link_watch.c:283)
[ 17.546630][ T37] process_one_work (kernel/workqueue.c:3229)
[ 17.546792][ T37] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 17.546942][ T37] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 17.547086][ T37] ? assign_work (kernel/workqueue.c:1200)
[ 17.547229][ T37] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 17.547386][ T37] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 17.547527][ T37] kthread (kernel/kthread.c:389)
[ 17.547632][ T37] ? __pfx_kthread (kernel/kthread.c:342)
[ 17.547772][ T37] ret_from_fork (arch/x86/kernel/process.c:147)
[ 17.547911][ T37] ? __pfx_kthread (kernel/kthread.c:342)


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