team_slave_0: entered allmulticast mode team_slave_1: entered allmulticast mode vlan2: entered allmulticast mode ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc1-syzkaller-00005-g488ef3560196 #0 Not tainted ------------------------------------------------------ syz.1.880/9004 is trying to acquire lock: ffff888058130d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2756 [inline] ffff888058130d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline] ffff888058130d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:39 [inline] ffff888058130d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: dev_set_allmulti+0xa2/0x260 net/core/dev_api.c:312 but task is already holding lock: ffff88805a2b4e00 (team->team_lock_key#5){+.+.}-{4:4}, at: team_change_rx_flags+0x39/0x220 drivers/net/team/team_core.c:1781 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (team->team_lock_key#5){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 team_port_change_check drivers/net/team/team_core.c:2966 [inline] team_device_event+0x11d/0x770 drivers/net/team/team_core.c:2992 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] dev_close_many+0x319/0x630 net/core/dev.c:1785 vlan_device_event+0x1555/0x2290 net/8021q/vlan.c:449 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] __dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499 netif_change_flags+0x108/0x160 net/core/dev.c:9526 do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141 rtnl_group_changelink net/core/rtnetlink.c:3773 [inline] __rtnl_newlink net/core/rtnetlink.c:3927 [inline] rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&dev_instance_lock_key#20){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 netdev_lock include/linux/netdevice.h:2756 [inline] netdev_lock_ops include/net/netdev_lock.h:42 [inline] netdev_lock_ops include/net/netdev_lock.h:39 [inline] dev_set_allmulti+0xa2/0x260 net/core/dev_api.c:312 vlan_dev_change_rx_flags+0xb6/0x150 net/8021q/vlan_dev.c:472 dev_change_rx_flags net/core/dev.c:9241 [inline] netif_set_allmulti+0x206/0x3d0 net/core/dev.c:9339 dev_set_allmulti+0xb7/0x260 net/core/dev_api.c:313 team_change_rx_flags+0x188/0x220 drivers/net/team/team_core.c:1789 dev_change_rx_flags net/core/dev.c:9241 [inline] netif_set_allmulti+0x206/0x3d0 net/core/dev.c:9339 __dev_change_flags+0x3d0/0x720 net/core/dev.c:9480 netif_change_flags+0x8d/0x160 net/core/dev.c:9521 do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141 rtnl_group_changelink net/core/rtnetlink.c:3773 [inline] __rtnl_newlink net/core/rtnetlink.c:3927 [inline] rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(team->team_lock_key#5); lock(&dev_instance_lock_key#20); lock(team->team_lock_key#5); lock(&dev_instance_lock_key#20); *** DEADLOCK *** 2 locks held by syz.1.880/9004: #0: ffffffff9034cbe8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff9034cbe8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff9034cbe8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054 #1: ffff88805a2b4e00 (team->team_lock_key#5){+.+.}-{4:4}, at: team_change_rx_flags+0x39/0x220 drivers/net/team/team_core.c:1781 stack backtrace: CPU: 0 UID: 0 PID: 9004 Comm: syz.1.880 Not tainted 6.16.0-rc1-syzkaller-00005-g488ef3560196 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2046 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 netdev_lock include/linux/netdevice.h:2756 [inline] netdev_lock_ops include/net/netdev_lock.h:42 [inline] netdev_lock_ops include/net/netdev_lock.h:39 [inline] dev_set_allmulti+0xa2/0x260 net/core/dev_api.c:312 vlan_dev_change_rx_flags+0xb6/0x150 net/8021q/vlan_dev.c:472 dev_change_rx_flags net/core/dev.c:9241 [inline] netif_set_allmulti+0x206/0x3d0 net/core/dev.c:9339 dev_set_allmulti+0xb7/0x260 net/core/dev_api.c:313 team_change_rx_flags+0x188/0x220 drivers/net/team/team_core.c:1789 dev_change_rx_flags net/core/dev.c:9241 [inline] netif_set_allmulti+0x206/0x3d0 net/core/dev.c:9339 __dev_change_flags+0x3d0/0x720 net/core/dev.c:9480 netif_change_flags+0x8d/0x160 net/core/dev.c:9521 do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141 rtnl_group_changelink net/core/rtnetlink.c:3773 [inline] __rtnl_newlink net/core/rtnetlink.c:3927 [inline] rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f32b0f8e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f32b1d85038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f32b11b5fa0 RCX: 00007f32b0f8e929 RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000000005 RBP: 00007f32b1010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f32b11b5fa0 R15: 00007ffcfc6d21c8 netdevsim netdevsim1 netdevsim0: entered allmulticast mode dummy0: entered allmulticast mode nlmon0: entered allmulticast mode caif0: entered allmulticast mode vxcan0: entered allmulticast mode vxcan1: entered allmulticast mode veth0: entered allmulticast mode veth1: entered allmulticast mode wg0: entered allmulticast mode wg1: entered allmulticast mode wg2: entered allmulticast mode veth0_to_bridge: entered allmulticast mode veth1_to_bridge: entered allmulticast mode veth0_to_bond: entered allmulticast mode veth1_to_bond: entered allmulticast mode veth0_to_team: entered allmulticast mode veth1_to_team: entered allmulticast mode veth0_to_batadv: entered allmulticast mode batadv_slave_0: entered allmulticast mode veth1_to_batadv: entered allmulticast mode batadv_slave_1: entered allmulticast mode xfrm0: entered allmulticast mode veth0_to_hsr: entered allmulticast mode hsr_slave_0: entered allmulticast mode veth1_to_hsr: entered allmulticast mode hsr_slave_1: entered allmulticast mode hsr0: entered allmulticast mode veth1_virt_wifi: entered allmulticast mode veth0_virt_wifi: entered allmulticast mode net veth1_virt_wifi virt_wifi0: entered allmulticast mode veth1_vlan: entered allmulticast mode veth0_vlan: entered allmulticast mode vlan0: entered allmulticast mode vlan1: entered allmulticast mode macvlan0: entered allmulticast mode macvlan1: entered allmulticast mode ipvlan0: entered allmulticast mode ipvlan1: entered allmulticast mode veth1_macvtap: entered allmulticast mode veth0_macvtap: entered allmulticast mode macvtap0: entered allmulticast mode macsec0: entered allmulticast mode geneve0: entered allmulticast mode geneve1: entered allmulticast mode netdevsim netdevsim1 netdevsim1: entered allmulticast mode netdevsim netdevsim1 netdevsim2: entered allmulticast mode netdevsim netdevsim1 netdevsim3: entered allmulticast mode mac80211_hwsim hwsim6 wlan0: entered allmulticast mode mac80211_hwsim hwsim7 wlan1: entered allmulticast mode syztnl1: entered allmulticast mode vxlan0: entered allmulticast mode bond3: entered allmulticast mode bridge1: entered allmulticast mode macsec1: entered allmulticast mode