[ 10.753805][ T269] ip (269) used greatest stack depth: 24312 bytes left [ 13.194235][ T305] ip (305) used greatest stack depth: 23960 bytes left [ 13.329861][ T306] br0: port 1(gw_l) entered blocking state [ 13.330321][ T306] br0: port 1(gw_l) entered disabled state [ 13.330585][ T306] gw_l: entered allmulticast mode [ 13.331894][ T306] gw_l: entered promiscuous mode [ 13.333796][ T306] br0: port 1(gw_l) entered blocking state [ 13.334167][ T306] br0: port 1(gw_l) entered forwarding state [ 13.705834][ T308] br0: port 2(amtg) entered blocking state [ 13.706233][ T308] br0: port 2(amtg) entered disabled state [ 13.706608][ T308] amtg: entered allmulticast mode [ 13.708079][ T308] amtg: entered promiscuous mode [ 15.092742][ T319] br0: port 2(amtg) entered blocking state [ 15.093387][ T319] br0: port 2(amtg) entered forwarding state [ 15.910792][ T326] amtr: entered allmulticast mode [ 15.911142][ T326] relay_gw: entered allmulticast mode [ 15.911547][ T326] relay_src: entered allmulticast mode [ 1180.767556][ T67] br0: port 1(gw_l) entered disabled state [ 1180.869439][ T67] gw_l (unregistering): left allmulticast mode [ 1180.869824][ T67] gw_l (unregistering): left promiscuous mode [ 1180.870034][ T67] br0: port 1(gw_l) entered disabled state [ 1180.871176][ T67] [ 1180.871264][ T67] ============================================ [ 1180.871435][ T67] WARNING: possible recursive locking detected [ 1180.871605][ T67] 6.13.0-rc5-virtme #1 Not tainted [ 1180.871742][ T67] -------------------------------------------- [ 1180.871913][ T67] kworker/u16:1/67 is trying to acquire lock: [ 1180.872082][ T67] ffffffffb5ff6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 1180.872366][ T67] [ 1180.872366][ T67] but task is already holding lock: [ 1180.872570][ T67] ffffffffb5ff6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 1180.872848][ T67] [ 1180.872848][ T67] other info that might help us debug this: [ 1180.873051][ T67] Possible unsafe locking scenario: [ 1180.873051][ T67] [ 1180.873250][ T67] CPU0 [ 1180.873355][ T67] ---- [ 1180.873458][ T67] lock((netdev_chain).rwsem); [ 1180.873600][ T67] lock((netdev_chain).rwsem); [ 1180.873738][ T67] [ 1180.873738][ T67] *** DEADLOCK *** [ 1180.873738][ T67] [ 1180.873941][ T67] May be due to missing lock nesting notation [ 1180.873941][ T67] [ 1180.874147][ T67] 5 locks held by kworker/u16:1/67: [ 1180.874286][ T67] #0: ffff8880010b5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7ec/0x16d0 [ 1180.874570][ T67] #1: ffffc90000487da0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0xe0b/0x16d0 [ 1180.874814][ T67] #2: ffffffffb5fec4d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xbc/0xba0 [ 1180.875060][ T67] #3: ffffffffb6007e88 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0x81/0x2e0 [ 1180.875341][ T67] #4: ffffffffb5ff6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 1180.875619][ T67] [ 1180.875619][ T67] stack backtrace: [ 1180.875790][ T67] CPU: 2 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.13.0-rc5-virtme #1 [ 1180.876035][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 1180.876210][ T67] Workqueue: netns cleanup_net [ 1180.876353][ T67] Call Trace: [ 1180.876459][ T67] [ 1180.876532][ T67] dump_stack_lvl+0x82/0xd0 [ 1180.876676][ T67] print_deadlock_bug+0x40a/0x650 [ 1180.876818][ T67] validate_chain+0x5bf/0xae0 [ 1180.876959][ T67] ? __pfx_validate_chain+0x10/0x10 [ 1180.877101][ T67] ? hlock_class+0x4e/0x130 [ 1180.877239][ T67] ? mark_lock+0x38/0x3e0 [ 1180.877346][ T67] __lock_acquire+0xb9a/0x1680 [ 1180.877487][ T67] lock_acquire.part.0+0xeb/0x330 [ 1180.877624][ T67] ? blocking_notifier_call_chain+0x50/0x90 [ 1180.877796][ T67] ? find_held_lock+0x2c/0x110 [ 1180.877937][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 1180.878077][ T67] ? trace_lock_acquire+0x14c/0x1f0 [ 1180.878215][ T67] ? lock_acquire+0x32/0xc0 [ 1180.878351][ T67] ? blocking_notifier_call_chain+0x50/0x90 [ 1180.878523][ T67] down_read+0x9f/0x340 [ 1180.878630][ T67] ? blocking_notifier_call_chain+0x50/0x90 [ 1180.878802][ T67] ? __pfx_down_read+0x10/0x10 [ 1180.878938][ T67] ? lockdep_hardirqs_on_prepare+0x12b/0x410 [ 1180.879111][ T67] blocking_notifier_call_chain+0x50/0x90 [ 1180.879252][ T67] __netdev_upper_dev_unlink+0xd9/0x220 [ 1180.879391][ T67] ? __pfx___netdev_upper_dev_unlink+0x10/0x10 [ 1180.879561][ T67] ? find_held_lock+0x2c/0x110 [ 1180.879706][ T67] ? del_nbp+0x377/0xbe0 [ 1180.879814][ T67] ? hlock_class+0x4e/0x130 [ 1180.879952][ T67] netdev_upper_dev_unlink+0x71/0xa0 [ 1180.880090][ T67] ? __pfx_netdev_upper_dev_unlink+0x10/0x10 [ 1180.880261][ T67] ? mutex_is_locked+0x12/0x60 [ 1180.880401][ T67] ? rtnl_is_locked+0x15/0x20 [ 1180.880540][ T67] del_nbp+0x602/0xbe0 [ 1180.880647][ T67] br_del_if+0xa3/0x1f0 [ 1180.880753][ T67] br_device_event+0x53d/0x800 [ 1180.880895][ T67] ? __pfx_br_device_event+0x10/0x10 [ 1180.881033][ T67] ? packet_notifier+0x3b0/0x810 [ 1180.881170][ T67] notifier_call_chain+0xcd/0x150 [ 1180.881313][ T67] blocking_notifier_call_chain+0x66/0x90 [ 1180.881454][ T67] unregister_netdevice_many_notify+0xa83/0x1580 [ 1180.881632][ T67] ? __pfx_unregister_netdevice_many_notify+0x10/0x10 [ 1180.881804][ T67] ? default_device_exit_batch+0x81/0x2e0 [ 1180.881941][ T67] ? rtnl_is_locked+0x15/0x20 [ 1180.882078][ T67] ? unregister_netdevice_queue+0x70/0x410 [ 1180.882250][ T67] ? __pfx_unregister_netdevice_queue+0x10/0x10 [ 1180.882422][ T67] ? __pfx_unregister_netdevice_queue+0x10/0x10 [ 1180.882597][ T67] default_device_exit_batch+0x241/0x2e0 [ 1180.882736][ T67] ? __pfx_default_device_exit_batch+0x10/0x10 [ 1180.882909][ T67] ? ops_exit_list+0xb4/0x170 [ 1180.883050][ T67] cleanup_net+0x4ef/0xba0 [ 1180.883188][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 1180.883330][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 1180.883468][ T67] ? trace_lock_acquire+0x14c/0x1f0 [ 1180.883606][ T67] ? lock_acquire+0x32/0xc0 [ 1180.883742][ T67] ? process_one_work+0xe0b/0x16d0 [ 1180.883882][ T67] process_one_work+0xe55/0x16d0 [ 1180.884023][ T67] ? __pfx___lock_release+0x10/0x10 [ 1180.884166][ T67] ? __pfx_process_one_work+0x10/0x10 [ 1180.884305][ T67] ? assign_work+0x16c/0x240 [ 1180.884446][ T67] worker_thread+0x58c/0xce0 [ 1180.884585][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 1180.884761][ T67] ? __pfx_worker_thread+0x10/0x10 [ 1180.884897][ T67] ? __pfx_worker_thread+0x10/0x10 [ 1180.885034][ T67] kthread+0x28a/0x350 [ 1180.885140][ T67] ? __pfx_kthread+0x10/0x10 [ 1180.885277][ T67] ret_from_fork+0x31/0x70 [ 1180.885415][ T67] ? __pfx_kthread+0x10/0x10 [ 1180.885552][ T67] ret_from_fork_asm+0x1a/0x30 [ 1180.885699][ T67] [ 1180.926935][ T67] amtg: left allmulticast mode [ 1180.927136][ T67] amtg: left promiscuous mode [ 1180.927410][ T67] br0: port 2(amtg) entered disabled state [ 1180.959035][ T326] amtr: left allmulticast mode [ 1180.959253][ T326] relay_gw: left allmulticast mode [ 1180.959432][ T326] relay_src: left allmulticast mode