[ 12.167211][ T293] ip (293) used greatest stack depth: 24432 bytes left [ 18.330085][ T66] [ 18.330197][ T66] ============================================ [ 18.330389][ T66] WARNING: possible recursive locking detected [ 18.330572][ T66] 6.13.0-rc5-virtme #1 Not tainted [ 18.330717][ T66] -------------------------------------------- [ 18.330897][ T66] kworker/u16:1/66 is trying to acquire lock: [ 18.331076][ T66] ffffffffbc3f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 18.331377][ T66] [ 18.331377][ T66] but task is already holding lock: [ 18.331593][ T66] ffffffffbc3f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 18.331887][ T66] [ 18.331887][ T66] other info that might help us debug this: [ 18.332109][ T66] Possible unsafe locking scenario: [ 18.332109][ T66] [ 18.332333][ T66] CPU0 [ 18.332442][ T66] ---- [ 18.332551][ T66] lock((netdev_chain).rwsem); [ 18.332701][ T66] lock((netdev_chain).rwsem); [ 18.332848][ T66] [ 18.332848][ T66] *** DEADLOCK *** [ 18.332848][ T66] [ 18.333062][ T66] May be due to missing lock nesting notation [ 18.333062][ T66] [ 18.333279][ T66] 5 locks held by kworker/u16:1/66: [ 18.333429][ T66] #0: ffff8880010b5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7ec/0x16d0 [ 18.333728][ T66] #1: ffffc90000477da0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0xe0b/0x16d0 [ 18.333992][ T66] #2: ffffffffbc3ec4d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xbc/0xba0 [ 18.334258][ T66] #3: ffffffffbc407e88 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0x81/0x2e0 [ 18.334558][ T66] #4: ffffffffbc3f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 18.334855][ T66] [ 18.334855][ T66] stack backtrace: [ 18.335040][ T66] CPU: 1 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.13.0-rc5-virtme #1 [ 18.335298][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 18.335481][ T66] Workqueue: netns cleanup_net [ 18.335634][ T66] Call Trace: [ 18.335746][ T66] [ 18.335825][ T66] dump_stack_lvl+0x82/0xd0 [ 18.335977][ T66] print_deadlock_bug+0x40a/0x650 [ 18.336128][ T66] validate_chain+0x5bf/0xae0 [ 18.336282][ T66] ? __pfx_validate_chain+0x10/0x10 [ 18.336432][ T66] ? hlock_class+0x4e/0x130 [ 18.336577][ T66] ? mark_lock+0x38/0x3e0 [ 18.336691][ T66] __lock_acquire+0xb9a/0x1680 [ 18.336844][ T66] lock_acquire.part.0+0xeb/0x330 [ 18.336992][ T66] ? blocking_notifier_call_chain+0x50/0x90 [ 18.337180][ T66] ? __lock_acquire+0xb9a/0x1680 [ 18.337328][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 18.337478][ T66] ? trace_lock_acquire+0x14c/0x1f0 [ 18.337627][ T66] ? lock_acquire+0x32/0xc0 [ 18.337774][ T66] ? blocking_notifier_call_chain+0x50/0x90 [ 18.337959][ T66] down_read+0x9f/0x340 [ 18.338076][ T66] ? blocking_notifier_call_chain+0x50/0x90 [ 18.338261][ T66] ? __pfx_down_read+0x10/0x10 [ 18.338410][ T66] ? __lock_release+0x103/0x460 [ 18.338561][ T66] blocking_notifier_call_chain+0x50/0x90 [ 18.338710][ T66] __netdev_upper_dev_unlink+0xd9/0x220 [ 18.338860][ T66] ? mark_held_locks+0x9e/0xe0 [ 18.339009][ T66] ? __pfx___netdev_upper_dev_unlink+0x10/0x10 [ 18.339193][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 18.339377][ T66] ? __try_to_del_timer_sync+0xe7/0x140 [ 18.339527][ T66] ? __pfx___try_to_del_timer_sync+0x10/0x10 [ 18.339714][ T66] ? mark_held_locks+0x9e/0xe0 [ 18.339867][ T66] netdev_upper_dev_unlink+0x71/0xa0 [ 18.340015][ T66] ? __pfx_netdev_upper_dev_unlink+0x10/0x10 [ 18.340200][ T66] ? mutex_is_locked+0x1c/0x60 [ 18.340350][ T66] ? rtnl_is_locked+0x15/0x20 [ 18.340500][ T66] ? netdev_master_upper_dev_get+0x13/0x120 [ 18.340685][ T66] vrf_device_event+0x78/0xe0 [ 18.340835][ T66] notifier_call_chain+0xcd/0x150 [ 18.340985][ T66] blocking_notifier_call_chain+0x66/0x90 [ 18.341133][ T66] unregister_netdevice_many_notify+0xa83/0x1580 [ 18.341320][ T66] ? __pfx_unregister_netdevice_many_notify+0x10/0x10 [ 18.341507][ T66] ? default_device_exit_batch+0x81/0x2e0 [ 18.341660][ T66] ? rtnl_is_locked+0x15/0x20 [ 18.341808][ T66] ? unregister_netdevice_queue+0x70/0x410 [ 18.341993][ T66] ? __pfx_unregister_netdevice_queue+0x10/0x10 [ 18.342186][ T66] ? __pfx_unregister_netdevice_queue+0x10/0x10 [ 18.342381][ T66] default_device_exit_batch+0x241/0x2e0 [ 18.342531][ T66] ? __pfx_default_device_exit_batch+0x10/0x10 [ 18.342715][ T66] ? ops_exit_list+0xb4/0x170 [ 18.342869][ T66] cleanup_net+0x4ef/0xba0 [ 18.343019][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 18.343168][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 18.343316][ T66] ? trace_lock_acquire+0x14c/0x1f0 [ 18.343467][ T66] ? lock_acquire+0x32/0xc0 [ 18.343617][ T66] ? process_one_work+0xe0b/0x16d0 [ 18.343767][ T66] process_one_work+0xe55/0x16d0 [ 18.343917][ T66] ? __pfx___lock_release+0x10/0x10 [ 18.344067][ T66] ? __pfx_process_one_work+0x10/0x10 [ 18.344217][ T66] ? assign_work+0x16c/0x240 [ 18.344366][ T66] worker_thread+0x58c/0xce0 [ 18.344515][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 18.344707][ T66] ? __pfx_worker_thread+0x10/0x10 [ 18.344857][ T66] ? __pfx_worker_thread+0x10/0x10 [ 18.345013][ T66] kthread+0x28a/0x350 [ 18.345130][ T66] ? __pfx_kthread+0x10/0x10 [ 18.345280][ T66] ret_from_fork+0x31/0x70 [ 18.345430][ T66] ? __pfx_kthread+0x10/0x10 [ 18.345578][ T66] ret_from_fork_asm+0x1a/0x30 [ 18.345733][ T66]