======================================
| [ 53.942372][ T67] #3: ffffffffb7df1088 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch (net/core/dev.c:12103)
| [ 53.942684][ T67] #4: ffffffffb7ddfc30 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [   53.942996][   T67]
| [   53.942996][   T67] stack backtrace:
[   53.943453][   T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   53.943651][   T67] Workqueue: netns cleanup_net
[   53.943813][   T67] Call Trace:
[   53.943935][   T67]  <TASK>
[ 53.944015][ T67] dump_stack_lvl (lib/dump_stack.c:123)
[ 53.944172][ T67] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 53.944337][ T67] validate_chain (kernel/locking/lockdep.c:3894)
[ 53.944484][ T67] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)


Finger prints: