netlink: 'syz.5.1291': attribute type 10 has an invalid length. @ÿ: left allmulticast mode @ÿ: left promiscuous mode @ÿ: entered promiscuous mode ============================================ WARNING: possible recursive locking detected 6.13.0-rc3-syzkaller-gc5d2bac978c5 #0 Not tainted -------------------------------------------- syz.5.1291/10954 is trying to acquire lock: ffff888071684e00 (team->team_lock_key#7){+.+.}-{4:4}, at: team_port_change_check+0x51/0x1e0 drivers/net/team/team_core.c:2950 but task is already holding lock: ffff888071684e00 (team->team_lock_key#7){+.+.}-{4:4}, at: team_add_slave+0xad/0x2760 drivers/net/team/team_core.c:1976 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(team->team_lock_key#7); lock(team->team_lock_key#7); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz.5.1291/10954: #0: ffffffff8fcb2948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcb2948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline] #0: ffffffff8fcb2948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xbcb/0x2150 net/core/rtnetlink.c:4010 #1: ffff888071684e00 (team->team_lock_key#7){+.+.}-{4:4}, at: team_add_slave+0xad/0x2760 drivers/net/team/team_core.c:1976 stack backtrace: CPU: 1 UID: 0 PID: 10954 Comm: syz.5.1291 Not tainted 6.13.0-rc3-syzkaller-gc5d2bac978c5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037 check_deadlock kernel/locking/lockdep.c:3089 [inline] validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 team_port_change_check+0x51/0x1e0 drivers/net/team/team_core.c:2950 team_device_event+0x4e6/0x5b0 drivers/net/team/team_core.c:2973 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 __dev_notify_flags+0x207/0x400 dev_change_flags+0xf0/0x1a0 net/core/dev.c:9026 vlan_device_event+0x1b81/0x1de0 net/8021q/vlan.c:468 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] dev_open+0x13a/0x1b0 net/core/dev.c:1517 team_port_add drivers/net/team/team_core.c:1218 [inline] team_add_slave+0x9c8/0x2760 drivers/net/team/team_core.c:1977 do_set_master net/core/rtnetlink.c:2917 [inline] do_setlink+0xe40/0x4210 net/core/rtnetlink.c:3116 rtnl_changelink net/core/rtnetlink.c:3723 [inline] __rtnl_newlink net/core/rtnetlink.c:3874 [inline] rtnl_newlink+0x1519/0x2150 net/core/rtnetlink.c:4011 rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6921 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2542 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:726 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2583 ___sys_sendmsg net/socket.c:2637 [inline] __sys_sendmsg+0x269/0x350 net/socket.c:2669 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8422785d29 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:00007f842352b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8422975fa0 RCX: 00007f8422785d29 RDX: 0000000000000000 RSI: 0000000020000600 RDI: 0000000000000000 RBP: 00007f8422801aa8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8422975fa0 R15: 00007ffe4c5049b8