batman_adv: batadv0: Removing interface: batadv_slave_1 batman_adv: batadv0: Removing interface: veth19 device  left promiscuous mode bridge0: port 2() entered disabled state device bond1 left promiscuous mode device veth33 left promiscuous mode ====================================================== WARNING: possible circular locking dependency detected 5.9.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:9/29997 is trying to acquire lock: ffff88808e338280 (&vlan_netdev_addr_lock_key/1){+...}-{2:2}, at: netif_addr_lock_nested include/linux/netdevice.h:4286 [inline] ffff88808e338280 (&vlan_netdev_addr_lock_key/1){+...}-{2:2}, at: dev_uc_sync_multiple+0xdc/0x190 net/core/dev_addr_lists.c:670 but task is already holding lock: ffff88805c198280 (&dev_addr_list_lock_key/2){+...}-{2:2}, at: netif_addr_lock_nested include/linux/netdevice.h:4286 [inline] ffff88805c198280 (&dev_addr_list_lock_key/2){+...}-{2:2}, at: dev_mc_unsync net/core/dev_addr_lists.c:925 [inline] ffff88805c198280 (&dev_addr_list_lock_key/2){+...}-{2:2}, at: dev_mc_unsync+0xf4/0x190 net/core/dev_addr_lists.c:918 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&dev_addr_list_lock_key/2){+...}-{2:2}: _raw_spin_lock_nested+0x30/0x40 kernel/locking/spinlock.c:361 netif_addr_lock_nested include/linux/netdevice.h:4286 [inline] dev_mc_sync+0xdc/0x190 net/core/dev_addr_lists.c:870 vlan_dev_set_rx_mode+0x38/0x80 net/8021q/vlan_dev.c:487 __dev_set_rx_mode+0x1ea/0x300 net/core/dev.c:8205 dev_uc_sync_multiple+0x155/0x190 net/core/dev_addr_lists.c:673 bond_set_rx_mode+0x1ae/0x480 drivers/net/bonding/bond_main.c:3874 __dev_set_rx_mode+0x1ea/0x300 net/core/dev.c:8205 __dev_mc_del net/core/dev_addr_lists.c:818 [inline] dev_mc_del+0x9e/0xb0 net/core/dev_addr_lists.c:833 mrp_uninit_applicant+0x210/0x360 net/802/mrp.c:903 unregister_vlan_dev+0x400/0x570 net/8021q/vlan.c:114 default_device_exit_batch+0x22f/0x3d0 net/core/dev.c:10906 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:189 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 -> #0 (&vlan_netdev_addr_lock_key/1){+...}-{2:2}: check_prev_add kernel/locking/lockdep.c:2496 [inline] check_prevs_add kernel/locking/lockdep.c:2601 [inline] validate_chain kernel/locking/lockdep.c:3218 [inline] __lock_acquire+0x2a6b/0x5640 kernel/locking/lockdep.c:4426 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:5005 _raw_spin_lock_nested+0x30/0x40 kernel/locking/spinlock.c:361 netif_addr_lock_nested include/linux/netdevice.h:4286 [inline] dev_uc_sync_multiple+0xdc/0x190 net/core/dev_addr_lists.c:670 bond_set_rx_mode+0x1ae/0x480 drivers/net/bonding/bond_main.c:3874 __dev_set_rx_mode+0x1ea/0x300 net/core/dev.c:8205 dev_mc_unsync net/core/dev_addr_lists.c:927 [inline] dev_mc_unsync+0x139/0x190 net/core/dev_addr_lists.c:918 vlan_dev_stop+0x51/0x350 net/8021q/vlan_dev.c:315 __dev_close_many+0x1b3/0x2e0 net/core/dev.c:1605 dev_close_many+0x238/0x650 net/core/dev.c:1630 rollback_registered_many+0x3a8/0x1210 net/core/dev.c:9260 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10428 unregister_netdevice_many net/core/dev.c:10427 [inline] default_device_exit_batch+0x30c/0x3d0 net/core/dev.c:10911 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:189 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&dev_addr_list_lock_key/2); lock(&vlan_netdev_addr_lock_key/1); lock(&dev_addr_list_lock_key/2); lock(&vlan_netdev_addr_lock_key/1); *** DEADLOCK *** 7 locks held by kworker/u4:9/29997: #0: ffff8880a97b0138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880a97b0138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8880a97b0138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8880a97b0138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8880a97b0138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8880a97b0138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc9000664fda8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffffffff8a7dd0b0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa00 net/core/net_namespace.c:565 #3: ffffffff8a7ea188 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock_unregistering net/core/dev.c:10864 [inline] #3: ffffffff8a7ea188 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xea/0x3d0 net/core/dev.c:10902 #4: ffff888051100280 (&vlan_netdev_addr_lock_key){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:359 [inline] #4: ffff888051100280 (&vlan_netdev_addr_lock_key){+...}-{2:2}, at: netif_addr_lock_bh include/linux/netdevice.h:4291 [inline] #4: ffff888051100280 (&vlan_netdev_addr_lock_key){+...}-{2:2}, at: dev_mc_unsync net/core/dev_addr_lists.c:924 [inline] #4: ffff888051100280 (&vlan_netdev_addr_lock_key){+...}-{2:2}, at: dev_mc_unsync+0xb0/0x190 net/core/dev_addr_lists.c:918 #5: ffff88805c198280 (&dev_addr_list_lock_key/2){+...}-{2:2}, at: netif_addr_lock_nested include/linux/netdevice.h:4286 [inline] #5: ffff88805c198280 (&dev_addr_list_lock_key/2){+...}-{2:2}, at: dev_mc_unsync net/core/dev_addr_lists.c:925 [inline] #5: ffff88805c198280 (&dev_addr_list_lock_key/2){+...}-{2:2}, at: dev_mc_unsync+0xf4/0x190 net/core/dev_addr_lists.c:918 #6: ffffffff89bd6b40 (rcu_read_lock){....}-{1:2}, at: bond_set_rx_mode+0x0/0x480 drivers/net/bonding/bond_main.c:943 stack backtrace: CPU: 1 PID: 29997 Comm: kworker/u4:9 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 check_noncircular+0x324/0x3e0 kernel/locking/lockdep.c:1827 check_prev_add kernel/locking/lockdep.c:2496 [inline] check_prevs_add kernel/locking/lockdep.c:2601 [inline] validate_chain kernel/locking/lockdep.c:3218 [inline] __lock_acquire+0x2a6b/0x5640 kernel/locking/lockdep.c:4426 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:5005 _raw_spin_lock_nested+0x30/0x40 kernel/locking/spinlock.c:361 netif_addr_lock_nested include/linux/netdevice.h:4286 [inline] dev_uc_sync_multiple+0xdc/0x190 net/core/dev_addr_lists.c:670 bond_set_rx_mode+0x1ae/0x480 drivers/net/bonding/bond_main.c:3874 __dev_set_rx_mode+0x1ea/0x300 net/core/dev.c:8205 dev_mc_unsync net/core/dev_addr_lists.c:927 [inline] dev_mc_unsync+0x139/0x190 net/core/dev_addr_lists.c:918 vlan_dev_stop+0x51/0x350 net/8021q/vlan_dev.c:315 __dev_close_many+0x1b3/0x2e0 net/core/dev.c:1605 dev_close_many+0x238/0x650 net/core/dev.c:1630 rollback_registered_many+0x3a8/0x1210 net/core/dev.c:9260 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10428 unregister_netdevice_many net/core/dev.c:10427 [inline] default_device_exit_batch+0x30c/0x3d0 net/core/dev.c:10911 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:189 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 device bond0 left promiscuous mode device bond_slave_0 left promiscuous mode device bond_slave_1 left promiscuous mode device vlan8 left promiscuous mode device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode bond0 (unregistering): (slave vlan8): Releasing backup interface bond20 (unregistering): Released all slaves bond19 (unregistering): Released all slaves bond18 (unregistering): Released all slaves bond17 (unregistering): Released all slaves bond16 (unregistering): Released all slaves bond15 (unregistering): Released all slaves bond14 (unregistering): Released all slaves bond13 (unregistering): (slave veth158): Releasing backup interface bond13 (unregistering): (slave veth156): Releasing backup interface bond13 (unregistering): Released all slaves @þ (unregistering): Port device veth154 removed bond12 (unregistering): Released all slaves @þ (unregistering): Port device bond11 removed bond11 (unregistering): Released all slaves bond10 (unregistering): Released all slaves bond9 (unregistering): Released all slaves bond8 (unregistering): Released all slaves bond7 (unregistering): Released all slaves bond6 (unregistering): Released all slaves bond5 (unregistering): Released all slaves bond4 (unregistering): Released all slaves bond3 (unregistering): Released all slaves bond2 (unregistering): Released all slaves bond1 (unregistering): (slave veth33): Releasing backup interface bond1 (unregistering): Released all slaves @þ (unregistering): Port device team_slave_1 removed @þ (unregistering): Port device team_slave_0 removed bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): Released all slaves