====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.5114/19287 is trying to acquire lock: ffff888059014d00 (team->team_lock_key#4){+.+.}-{3:3}, at: team_del_slave+0x2d/0x1b0 drivers/net/team/team.c:2016 but task is already holding lock: ffff88807cfa87a8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0x109/0x120 net/wireless/nl80211.c:4401 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&rdev->wiphy.mtx){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747 wiphy_lock include/net/cfg80211.h:5693 [inline] ieee80211_open+0x140/0x200 net/mac80211/iface.c:466 __dev_open+0x2c7/0x430 net/core/dev.c:1501 dev_open+0xa7/0x190 net/core/dev.c:1537 team_port_add drivers/net/team/team.c:1227 [inline] team_add_slave+0x6bd/0x2820 drivers/net/team/team.c:2002 do_set_master net/core/rtnetlink.c:2642 [inline] do_setlink+0xd66/0x29c0 net/core/rtnetlink.c:2852 __rtnl_newlink net/core/rtnetlink.c:3622 [inline] rtnl_newlink+0x16e4/0x1f90 net/core/rtnetlink.c:3669 rtnetlink_rcv_msg+0x863/0xfb0 net/core/rtnetlink.c:6166 netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2573 __sys_sendmsg net/socket.c:2602 [inline] __do_sys_sendmsg net/socket.c:2611 [inline] __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (team->team_lock_key#4){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5678 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747 team_del_slave+0x2d/0x1b0 drivers/net/team/team.c:2016 team_device_event+0x393/0x9c0 drivers/net/team/team.c:3061 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] unregister_netdevice_many_notify+0x10b1/0x1990 net/core/dev.c:11023 unregister_netdevice_many net/core/dev.c:11077 [inline] unregister_netdevice_queue+0x2e5/0x330 net/core/dev.c:10960 unregister_netdevice include/linux/netdevice.h:3077 [inline] _cfg80211_unregister_wdev+0x179/0x590 net/wireless/core.c:1213 ieee80211_if_remove+0x1ad/0x2b0 net/mac80211/iface.c:2344 ieee80211_del_iface+0x15/0x20 net/mac80211/cfg.c:202 rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline] cfg80211_remove_virtual_intf+0x23a/0x440 net/wireless/util.c:2636 genl_family_rcv_msg_doit+0x22f/0x350 net/netlink/genetlink.c:756 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0x601/0x790 net/netlink/genetlink.c:850 netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2573 __sys_sendmsg net/socket.c:2602 [inline] __do_sys_sendmsg net/socket.c:2611 [inline] __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rdev->wiphy.mtx); lock(team->team_lock_key#4); lock(&rdev->wiphy.mtx); lock(team->team_lock_key#4); *** DEADLOCK *** 3 locks held by syz.1.5114/19287: #0: ffffffff8ddb5b90 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860 #1: ffffffff8dd550a8 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5a/0x890 net/wireless/nl80211.c:16384 #2: ffff88807cfa87a8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0x109/0x120 net/wireless/nl80211.c:4401 stack backtrace: CPU: 0 PID: 19287 Comm: syz.1.5114 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5678 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747 team_del_slave+0x2d/0x1b0 drivers/net/team/team.c:2016 team_device_event+0x393/0x9c0 drivers/net/team/team.c:3061 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] unregister_netdevice_many_notify+0x10b1/0x1990 net/core/dev.c:11023 unregister_netdevice_many net/core/dev.c:11077 [inline] unregister_netdevice_queue+0x2e5/0x330 net/core/dev.c:10960 unregister_netdevice include/linux/netdevice.h:3077 [inline] _cfg80211_unregister_wdev+0x179/0x590 net/wireless/core.c:1213 ieee80211_if_remove+0x1ad/0x2b0 net/mac80211/iface.c:2344 ieee80211_del_iface+0x15/0x20 net/mac80211/cfg.c:202 rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline] cfg80211_remove_virtual_intf+0x23a/0x440 net/wireless/util.c:2636 genl_family_rcv_msg_doit+0x22f/0x350 net/netlink/genetlink.c:756 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0x601/0x790 net/netlink/genetlink.c:850 netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2573 __sys_sendmsg net/socket.c:2602 [inline] __do_sys_sendmsg net/socket.c:2611 [inline] __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fd1b139e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd1b226c028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd1b1625fa0 RCX: 00007fd1b139e159 RDX: 0000000000000000 RSI: 0000200000000200 RDI: 0000000000000004 RBP: 00007fd1b143506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd1b1626038 R14: 00007fd1b1625fa0 R15: 00007ffff6262b38 team0: Port device wlan1 removed