============================================
WARNING: possible recursive locking detected
5.9.0-rc1-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.0/15046 is trying to acquire lock:
ffff888060a44c78 (team->team_lock_key){+.+.}-{3:3}, at: team_port_change_check drivers/net/team/team.c:2969 [inline]
ffff888060a44c78 (team->team_lock_key){+.+.}-{3:3}, at: team_device_event+0x372/0xab6 drivers/net/team/team.c:2995
but task is already holding lock:
ffff888060a44c78 (team->team_lock_key){+.+.}-{3:3}, at: team_add_slave+0x9f/0x1960 drivers/net/team/team.c:1966
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(team->team_lock_key);
lock(team->team_lock_key);
*** DEADLOCK ***
May be due to missing lock nesting notation
2 locks held by syz-executor.0/15046:
#0: ffffffff8a7e7a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
#0: ffffffff8a7e7a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5560
#1: ffff888060a44c78 (team->team_lock_key){+.+.}-{3:3}, at: team_add_slave+0x9f/0x1960 drivers/net/team/team.c:1966
stack backtrace:
CPU: 0 PID: 15046 Comm: syz-executor.0 Not tainted 5.9.0-rc1-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+0x18f/0x20d lib/dump_stack.c:118
print_deadlock_bug kernel/locking/lockdep.c:2391 [inline]
check_deadlock kernel/locking/lockdep.c:2432 [inline]
validate_chain kernel/locking/lockdep.c:3202 [inline]
__lock_acquire.cold+0x115/0x396 kernel/locking/lockdep.c:4426
lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:5005
__mutex_lock_common kernel/locking/mutex.c:956 [inline]
__mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1103
team_port_change_check drivers/net/team/team.c:2969 [inline]
team_device_event+0x372/0xab6 drivers/net/team/team.c:2995
notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2033
call_netdevice_notifiers_extack net/core/dev.c:2045 [inline]
call_netdevice_notifiers net/core/dev.c:2059 [inline]
dev_close_many+0x30b/0x650 net/core/dev.c:1634
vlan_device_event+0x8ef/0x2010 net/8021q/vlan.c:450
notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2033
call_netdevice_notifiers_extack net/core/dev.c:2045 [inline]
call_netdevice_notifiers net/core/dev.c:2059 [inline]
dev_close_many+0x30b/0x650 net/core/dev.c:1634
dev_close net/core/dev.c:1656 [inline]
dev_close+0x173/0x220 net/core/dev.c:1650
team_port_add drivers/net/team/team.c:1305 [inline]
team_add_slave+0xf45/0x1960 drivers/net/team/team.c:1967
do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2517
do_setlink+0x911/0x3a70 net/core/rtnetlink.c:2713
__rtnl_newlink+0xc1c/0x1740 net/core/rtnetlink.c:3374
rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500
rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5563
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:671
____sys_sendmsg+0x6e8/0x810 net/socket.c:2353
___sys_sendmsg+0xf3/0x170 net/socket.c:2407
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2440
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f146f067c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002ccc0 RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 000000000118d020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007fff5188228f R14: 00007f146f0689c0 R15: 000000000118cfec