============================================ WARNING: possible recursive locking detected 4.18.0-rc8+ #186 Not tainted -------------------------------------------- syz-executor3/27173 is trying to acquire lock: 0000000095d99bca (&team->lock){+.+.}, at: team_vlan_rx_add_vid+0x3b/0x1e0 drivers/net/team/team.c:1864 but task is already holding lock: 0000000095d99bca (&team->lock){+.+.}, at: team_add_slave+0xdb/0x1c30 drivers/net/team/team.c:1943 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&team->lock); lock(&team->lock); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor3/27173: #0: 000000007433b0f5 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 000000007433b0f5 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x412/0xc30 net/core/rtnetlink.c:4708 #1: 0000000095d99bca (&team->lock){+.+.}, at: team_add_slave+0xdb/0x1c30 drivers/net/team/team.c:1943 stack backtrace: CPU: 0 PID: 27173 Comm: syz-executor3 Not tainted 4.18.0-rc8+ #186 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_deadlock_bug kernel/locking/lockdep.c:1765 [inline] check_deadlock kernel/locking/lockdep.c:1809 [inline] validate_chain kernel/locking/lockdep.c:2405 [inline] __lock_acquire.cold.65+0x1fb/0x486 kernel/locking/lockdep.c:3435 lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 __mutex_lock_common kernel/locking/mutex.c:757 [inline] __mutex_lock+0x176/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 team_vlan_rx_add_vid+0x3b/0x1e0 drivers/net/team/team.c:1864 vlan_add_rx_filter_info+0x14a/0x1d0 net/8021q/vlan_core.c:210 __vlan_vid_add net/8021q/vlan_core.c:278 [inline] vlan_vid_add+0x63e/0x9d0 net/8021q/vlan_core.c:308 vlan_device_event.cold.12+0x2a/0x2f net/8021q/vlan.c:381 notifier_call_chain+0x180/0x390 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1734 call_netdevice_notifiers net/core/dev.c:1752 [inline] dev_open+0x173/0x1b0 net/core/dev.c:1432 team_port_add drivers/net/team/team.c:1214 [inline] team_add_slave+0xa8b/0x1c30 drivers/net/team/team.c:1944 do_set_master+0x1c9/0x220 net/core/rtnetlink.c:2294 do_setlink+0xba4/0x3de0 net/core/rtnetlink.c:2428 rtnl_setlink+0x2a2/0x3f0 net/core/rtnetlink.c:2682 rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4711 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4729 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1343 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:640 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:650 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2133 __sys_sendmsg+0x11d/0x290 net/socket.c:2171 __do_sys_sendmsg net/socket.c:2180 [inline] __se_sys_sendmsg net/socket.c:2178 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2178 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fea3c77bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fea3c77c6d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d3ce0 R14: 00000000004c8929 R15: 0000000000000000