============================================ WARNING: possible recursive locking detected 5.7.0-rc2-syzkaller #0 Not tainted -------------------------------------------- syz-executor.2/31788 is trying to acquire lock: ffff88806606ac78 (team->team_lock_key#3){+.+.}-{3:3}, at: team_port_change_check+0x43/0x130 drivers/net/team/team.c:2968 but task is already holding lock: ffff88806606ac78 (team->team_lock_key#3){+.+.}-{3:3}, at: team_add_slave+0x9d/0x1790 drivers/net/team/team.c:1965 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(team->team_lock_key#3); lock(team->team_lock_key#3); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.2/31788: #0: ffffffff8a582d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8a582d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458 #1: ffff88806606ac78 (team->team_lock_key#3){+.+.}-{3:3}, at: team_add_slave+0x9d/0x1790 drivers/net/team/team.c:1965 stack backtrace: CPU: 0 PID: 31788 Comm: syz-executor.2 Not tainted 5.7.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:2410 [inline] check_deadlock kernel/locking/lockdep.c:2451 [inline] validate_chain kernel/locking/lockdep.c:3221 [inline] __lock_acquire.cold+0x178/0x3f8 kernel/locking/lockdep.c:4355 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103 team_port_change_check+0x43/0x130 drivers/net/team/team.c:2968 team_device_event+0x163/0x410 drivers/net/team/team.c:2994 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:1948 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline] call_netdevice_notifiers net/core/dev.c:1974 [inline] dev_close_many+0x2f5/0x620 net/core/dev.c:1549 vlan_device_event+0x8fe/0x1fe0 net/8021q/vlan.c:450 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:1948 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline] call_netdevice_notifiers net/core/dev.c:1974 [inline] dev_close_many+0x2f5/0x620 net/core/dev.c:1549 dev_close.part.0+0xfd/0x1c0 net/core/dev.c:1571 dev_close+0x58/0x70 net/core/dev.c:1574 team_port_add drivers/net/team/team.c:1305 [inline] team_add_slave+0xf2a/0x1790 drivers/net/team/team.c:1966 do_set_master net/core/rtnetlink.c:2477 [inline] do_set_master+0x1d7/0x230 net/core/rtnetlink.c:2450 do_setlink+0xaa2/0x3680 net/core/rtnetlink.c:2612 __rtnl_newlink+0xad5/0x1590 net/core/rtnetlink.c:3273 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3643431c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000500b20 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009fd R14: 00000000004ccb59 R15: 00007f36434326d4