device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state 8021q: adding VLAN 0 to HW filter on device team0 ============================================ WARNING: possible recursive locking detected 4.19.211-syzkaller #0 Not tainted -------------------------------------------- syz-executor.4/18196 is trying to acquire lock: 00000000e5e58ee4 (&team->lock){+.+.}, at: team_vlan_rx_add_vid+0x38/0x1e0 drivers/net/team/team.c:1896 but task is already holding lock: 00000000177c869e (&team->lock){+.+.}, at: team_add_slave+0x98/0x1fa0 drivers/net/team/team.c:1975 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-executor.4/18196: #0: 00000000dffe6b76 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 00000000dffe6b76 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779 #1: 00000000177c869e (&team->lock){+.+.}, at: team_add_slave+0x98/0x1fa0 drivers/net/team/team.c:1975 stack backtrace: CPU: 1 PID: 18196 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:1764 [inline] check_deadlock kernel/locking/lockdep.c:1808 [inline] validate_chain kernel/locking/lockdep.c:2404 [inline] __lock_acquire.cold+0x121/0x57e kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 team_vlan_rx_add_vid+0x38/0x1e0 drivers/net/team/team.c:1896 vlan_add_rx_filter_info+0x13c/0x1c0 net/8021q/vlan_core.c:210 __vlan_vid_add net/8021q/vlan_core.c:278 [inline] vlan_vid_add+0x3ee/0x7e0 net/8021q/vlan_core.c:308 vlan_device_event.cold+0x28/0x2d net/8021q/vlan.c:382 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93 call_netdevice_notifiers net/core/dev.c:1762 [inline] dev_open net/core/dev.c:1442 [inline] dev_open+0x128/0x140 net/core/dev.c:1430 team_port_add drivers/net/team/team.c:1220 [inline] team_add_slave+0xb02/0x1fa0 drivers/net/team/team.c:1976 do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2321 do_setlink+0x7ec/0x3540 net/core/rtnetlink.c:2455 rtnl_newlink+0xda9/0x15c0 net/core/rtnetlink.c:3077 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4782 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f781fbeb5a9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f781e55e168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f781fd0bf80 RCX: 00007f781fbeb5a9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000006 RBP: 00007f781fc46580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe4f9aca1f R14: 00007f781e55e300 R15: 0000000000022000 device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode team1: Port device team0 added IPv6: ADDRCONF(NETDEV_CHANGE): team1: link becomes ready ieee80211 phy2940: Selected rate control algorithm 'minstrel_ht' ieee80211 phy2941: Selected rate control algorithm 'minstrel_ht' ieee80211 phy2942: Selected rate control algorithm 'minstrel_ht' IPVS: ftp: loaded support on port[0] = 21 ieee80211 phy2943: Selected rate control algorithm 'minstrel_ht' ieee80211 phy2944: Selected rate control algorithm 'minstrel_ht' ieee80211 phy2945: Selected rate control algorithm 'minstrel_ht' ieee80211 phy2946: Selected rate control algorithm 'minstrel_ht' ieee80211 phy2947: Selected rate control algorithm 'minstrel_ht' EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue ieee80211 phy2948: Selected rate control algorithm 'minstrel_ht' audit: type=1326 audit(1665538419.754:301): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=18622 comm="syz-executor.2" exe="/root/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fd07c61f5a9 code=0x0