====================================== | [ 88.026284][ T67] #3: ffffffff90c07e88 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch (net/core/dev.c:12103) | [ 88.026564][ T67] #4: ffffffff90bf6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 88.026852][ T67] | [ 88.026852][ T67] stack backtrace: [ 88.027272][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 88.027447][ T67] Workqueue: netns cleanup_net [ 88.027590][ T67] Call Trace: [ 88.027697][ T67] [ 88.027771][ T67] dump_stack_lvl (lib/dump_stack.c:123) [ 88.027919][ T67] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 88.028063][ T67] validate_chain (kernel/locking/lockdep.c:3894) [ 88.028205][ T67] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 88.028347][ T67] ? 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) [ 88.028489][ T67] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 88.028601][ T67] __lock_acquire (kernel/locking/lockdep.c:5226) [ 88.028746][ T67] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 88.028882][ T67] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 88.029062][ T67] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 88.029204][ T67] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 88.029345][ T67] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 88.029483][ T67] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 88.029657][ T67] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 88.029768][ T67] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 88.029942][ T67] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 88.030085][ T67] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 88.030236][ T67] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 88.030378][ T67] __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)) [ 88.030520][ T67] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151) [ 88.030693][ T67] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 88.030834][ T67] ? del_nbp (net/bridge/br_if.c:215 net/bridge/br_if.c:359) [ 88.030942][ T67] ? 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) [ 88.031081][ T67] netdev_upper_dev_unlink (net/core/dev.c:8190) [ 88.031221][ T67] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190) [ 88.031395][ T67] ? 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) [ 88.031533][ T67] ? rtnl_is_locked (net/core/rtnetlink.c:164) [ 88.031674][ T67] del_nbp (net/bridge/br_if.c:365) [ 88.031779][ T67] br_del_if (net/bridge/br_if.c:741) [ 88.031893][ T67] br_device_event (net/bridge/br.c:141) [ 88.032035][ T67] ? __pfx_br_device_event (net/bridge/br.c:29) [ 88.032180][ T67] ? packet_notifier (net/packet/af_packet.c:4282) [ 88.032319][ T67] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 88.032459][ T67] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 88.032601][ T67] unregister_netdevice_many_notify (net/core/dev.c:11571) [ 88.032773][ T67] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512) [ 88.032943][ T67] ? default_device_exit_batch (net/core/dev.c:12103) [ 88.033088][ T67] ? rtnl_is_locked (net/core/rtnetlink.c:164) [ 88.033226][ T67] ? unregister_netdevice_queue (net/core/dev.c:11497) [ 88.033394][ T67] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496) [ 88.033565][ T67] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496) [ 88.033739][ T67] default_device_exit_batch (net/core/dev.c:12117) [ 88.033877][ T67] ? __pfx_default_device_exit_batch (net/core/dev.c:12092) [ 88.034049][ T67] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3)) [ 88.034194][ T67] cleanup_net (net/core/net_namespace.c:647 (discriminator 3)) [ 88.034332][ T67] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 88.034470][ T67] ? __pfx_cleanup_net (net/core/net_namespace.c:592) [ 88.034610][ T67] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 88.034748][ T67] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 88.034886][ T67] ? process_one_work (kernel/workqueue.c:3205) [ 88.035026][ T67] process_one_work (kernel/workqueue.c:3229) [ 88.035166][ T67] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 88.035306][ T67] ? __pfx_process_one_work (kernel/workqueue.c:3131) [ 88.035450][ T67] ? assign_work (kernel/workqueue.c:1200) [ 88.035589][ T67] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391) [ 88.035725][ T67] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 88.035899][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337) [ 88.036037][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337) [ 88.036173][ T67] kthread (kernel/kthread.c:389) [ 88.036279][ T67] ? __pfx_kthread (kernel/kthread.c:342) [ 88.036425][ T67] ret_from_fork (arch/x86/kernel/process.c:147) [ 88.036567][ T67] ? __pfx_kthread (kernel/kthread.c:342) Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain