====================================== | [ 23.284801][ T66] #3: ffffffff8d007e88 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch (net/core/dev.c:12109) | [ 23.285121][ T66] #4: ffffffff8cff6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 23.285446][ T66] | [ 23.285446][ T66] stack backtrace: [ 23.285923][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 23.286133][ T66] Workqueue: netns cleanup_net [ 23.286301][ T66] Call Trace: [ 23.286423][ T66] [ 23.286509][ T66] dump_stack_lvl (lib/dump_stack.c:123) [ 23.286674][ T66] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 23.286837][ T66] validate_chain (kernel/locking/lockdep.c:3894) [ 23.287001][ T66] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 23.287164][ 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) [ 23.287322][ T66] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 23.287441][ T66] __lock_acquire (kernel/locking/lockdep.c:5226) [ 23.287601][ T66] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 23.287759][ T66] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 23.287956][ T66] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 23.288115][ T66] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 23.288272][ T66] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 23.288432][ T66] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 23.288633][ 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) [ 23.288755][ T66] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 23.288948][ T66] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 23.289109][ T66] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 23.289276][ T66] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 23.289439][ 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)) [ 23.289598][ T66] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 23.289797][ T66] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 23.289954][ T66] ? del_nbp (net/bridge/br_if.c:215 net/bridge/br_if.c:359) [ 23.290077][ 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) [ 23.290236][ T66] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 23.290401][ T66] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 23.290603][ 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) [ 23.290764][ T66] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 23.290924][ T66] del_nbp (net/bridge/br_if.c:365) [ 23.291046][ T66] br_del_if (net/bridge/br_if.c:741) [ 23.291168][ T66] br_device_event (net/bridge/br.c:141) [ 23.291326][ T66] ? __pfx_br_device_event (net/bridge/br.c:29) [ 23.291484][ T66] ? packet_notifier (net/packet/af_packet.c:4282) [ 23.291649][ T66] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 23.291811][ T66] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 23.291973][ T66] unregister_netdevice_many_notify (net/core/dev.c:11575) [ 23.292175][ T66] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11516) [ 23.292374][ T66] ? default_device_exit_batch (net/core/dev.c:12109) [ 23.292532][ T66] ? rtnl_is_locked (net/core/rtnetlink.c:163) [ 23.292690][ T66] ? unregister_netdevice_queue (net/core/dev.c:11501) [ 23.292892][ T66] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 23.293087][ T66] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11500) [ 23.293288][ T66] default_device_exit_batch (net/core/dev.c:12123) [ 23.293445][ T66] ? __pfx_default_device_exit_batch (net/core/dev.c:12098) [ 23.293646][ T66] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3)) [ 23.293805][ T66] cleanup_net (net/core/net_namespace.c:647 (discriminator 3)) [ 23.293970][ T66] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 23.294128][ T66] ? __pfx_cleanup_net (net/core/net_namespace.c:592) [ 23.294285][ T66] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 23.294444][ T66] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 23.294602][ T66] ? process_one_work (kernel/workqueue.c:3205) [ 23.294762][ T66] process_one_work (kernel/workqueue.c:3229) [ 23.294924][ T66] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 23.295088][ T66] ? __pfx_process_one_work (kernel/workqueue.c:3131) [ 23.295249][ T66] ? assign_work (kernel/workqueue.c:1200) [ 23.295413][ T66] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391) [ 23.295572][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 23.295772][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3337) [ 23.295930][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3337) [ 23.296097][ T66] kthread (kernel/kthread.c:389) [ 23.296224][ T66] ? __pfx_kthread (kernel/kthread.c:342) [ 23.296380][ T66] ret_from_fork (arch/x86/kernel/process.c:147) [ 23.296541][ T66] ? __pfx_kthread (kernel/kthread.c:342) Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain