====================================== | [ 23.744707][ T66] #3: ffffffff89a07e88 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch (net/core/dev.c:12103) | [ 23.745029][ T66] #4: ffffffff899f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 23.745357][ T66] | [ 23.745357][ T66] stack backtrace: [ 23.745811][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 23.746002][ T66] Workqueue: netns cleanup_net [ 23.746172][ T66] Call Trace: [ 23.746285][ T66] [ 23.746363][ T66] dump_stack_lvl (lib/dump_stack.c:123) [ 23.746522][ T66] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 23.746693][ T66] validate_chain (kernel/locking/lockdep.c:3894) [ 23.746841][ T66] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 23.746998][ T66] ? 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) [ 23.747149][ T66] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 23.747267][ T66] __lock_acquire (kernel/locking/lockdep.c:5226) [ 23.747419][ T66] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 23.747575][ T66] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 23.747768][ T66] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 23.747924][ T66] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 23.748078][ T66] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 23.748227][ T66] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 23.748419][ T66] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 23.748539][ T66] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 23.748727][ T66] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 23.748878][ T66] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 23.749026][ T66] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 23.749180][ T66] __netdev_upper_dev_unlink (net/core/dev.c:8000 (discriminator 11) net/core/dev.c:8017 (discriminator 11) net/core/dev.c:8167 (discriminator 11)) [ 23.749332][ T66] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 23.749519][ T66] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 23.749668][ T66] ? del_nbp (net/bridge/br_if.c:215 net/bridge/br_if.c:359) [ 23.749788][ T66] ? 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) [ 23.749941][ T66] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 23.750092][ T66] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 23.750285][ T66] ? mutex_is_locked (./include/linux/instrumented.h:68 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.h:47 kernel/locking/mutex.c:66) [ 23.750436][ T66] ? rtnl_is_locked (net/core/rtnetlink.c:164) [ 23.750590][ T66] del_nbp (net/bridge/br_if.c:365) [ 23.750707][ T66] br_del_if (net/bridge/br_if.c:741) [ 23.750828][ T66] br_device_event (net/bridge/br.c:141) [ 23.750985][ T66] ? __pfx_br_device_event (net/bridge/br.c:29) [ 23.751137][ T66] ? packet_notifier (net/packet/af_packet.c:4282) [ 23.751285][ T66] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 23.751438][ T66] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 23.751596][ T66] unregister_netdevice_many_notify (net/core/dev.c:11571) [ 23.751779][ T66] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512) [ 23.751967][ T66] ? default_device_exit_batch (net/core/dev.c:12103) [ 23.752121][ T66] ? rtnl_is_locked (net/core/rtnetlink.c:164) [ 23.752272][ T66] ? unregister_netdevice_queue (net/core/dev.c:11497) [ 23.752454][ T66] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496) [ 23.752639][ T66] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496) [ 23.752826][ T66] default_device_exit_batch (net/core/dev.c:12117) [ 23.752974][ T66] ? __pfx_default_device_exit_batch (net/core/dev.c:12092) [ 23.753160][ T66] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3)) [ 23.753311][ T66] cleanup_net (net/core/net_namespace.c:647 (discriminator 3)) [ 23.753462][ T66] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 23.753613][ T66] ? __pfx_cleanup_net (net/core/net_namespace.c:592) [ 23.753761][ T66] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 23.753906][ T66] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 23.754052][ T66] ? process_one_work (kernel/workqueue.c:3205) [ 23.754209][ T66] process_one_work (kernel/workqueue.c:3229) [ 23.754357][ T66] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 23.754509][ T66] ? __pfx_process_one_work (kernel/workqueue.c:3131) [ 23.754657][ T66] ? assign_work (kernel/workqueue.c:1200) [ 23.754810][ T66] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391) [ 23.754956][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 23.755141][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3337) [ 23.755294][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3337) [ 23.755435][ T66] kthread (kernel/kthread.c:389) [ 23.755552][ T66] ? __pfx_kthread (kernel/kthread.c:342) [ 23.755697][ T66] ret_from_fork (arch/x86/kernel/process.c:147) [ 23.755851][ T66] ? __pfx_kthread (kernel/kthread.c:342) Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain