====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.7.2016/11364 is trying to acquire lock: ffff88807bec4d00 (team->team_lock_key#8){+.+.}-{3:3}, at: team_del_slave+0x2e/0x1c0 drivers/net/team/team.c:2016 but task is already holding lock: ffff8880652b07c8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0x112/0x130 net/wireless/nl80211.c:4399 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/0xaf0 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+0xa7/0x180 net/core/dev.c:1537 team_port_add drivers/net/team/team.c:1227 [inline] team_add_slave+0x6e5/0x2870 drivers/net/team/team.c:2002 do_set_master net/core/rtnetlink.c:2630 [inline] do_setlink+0xd3a/0x3e60 net/core/rtnetlink.c:2840 __rtnl_newlink net/core/rtnetlink.c:3608 [inline] rtnl_newlink+0x177c/0x2080 net/core/rtnetlink.c:3655 rtnetlink_rcv_msg+0x87c/0xfc0 net/core/rtnetlink.c:6150 netlink_rcv_skb+0x1fb/0x450 net/netlink/af_netlink.c:2511 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5be/0x970 net/socket.c:2518 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572 __sys_sendmsg net/socket.c:2601 [inline] __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg+0x1bb/0x2a0 net/socket.c:2608 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#8){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 team_del_slave+0x2e/0x1c0 drivers/net/team/team.c:2016 team_device_event+0x391/0x9c0 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+0x1086/0x1930 net/core/dev.c:11003 unregister_netdevice_queue+0x324/0x370 net/core/dev.c:10934 unregister_netdevice include/linux/netdevice.h:3075 [inline] _cfg80211_unregister_wdev+0x177/0x590 net/wireless/core.c:1212 ieee80211_if_remove+0x1bd/0x2c0 net/mac80211/iface.c:2338 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+0x243/0x450 net/wireless/util.c:2634 genl_family_rcv_msg_doit+0x22a/0x330 net/netlink/genetlink.c:756 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0x604/0x790 net/netlink/genetlink.c:850 netlink_rcv_skb+0x1fb/0x450 net/netlink/af_netlink.c:2511 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5be/0x970 net/socket.c:2518 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572 __sys_sendmsg net/socket.c:2601 [inline] __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg+0x1bb/0x2a0 net/socket.c:2608 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#8); lock(&rdev->wiphy.mtx); lock(team->team_lock_key#8); *** DEADLOCK *** 3 locks held by syz.7.2016/11364: #0: ffffffff8dda6490 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860 #1: ffffffff8dd46268 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5b/0x930 net/wireless/nl80211.c:16369 #2: ffff8880652b07c8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0x112/0x130 net/wireless/nl80211.c:4399 stack backtrace: CPU: 1 PID: 11364 Comm: syz.7.2016 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 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:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 team_del_slave+0x2e/0x1c0 drivers/net/team/team.c:2016 team_device_event+0x391/0x9c0 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+0x1086/0x1930 net/core/dev.c:11003 unregister_netdevice_queue+0x324/0x370 net/core/dev.c:10934 unregister_netdevice include/linux/netdevice.h:3075 [inline] _cfg80211_unregister_wdev+0x177/0x590 net/wireless/core.c:1212 ieee80211_if_remove+0x1bd/0x2c0 net/mac80211/iface.c:2338 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+0x243/0x450 net/wireless/util.c:2634 genl_family_rcv_msg_doit+0x22a/0x330 net/netlink/genetlink.c:756 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0x604/0x790 net/netlink/genetlink.c:850 netlink_rcv_skb+0x1fb/0x450 net/netlink/af_netlink.c:2511 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5be/0x970 net/socket.c:2518 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572 __sys_sendmsg net/socket.c:2601 [inline] __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg+0x1bb/0x2a0 net/socket.c:2608 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: 0033:0x7f1167d9bf79 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:00007f1168c48028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1168015fa0 RCX: 00007f1167d9bf79 RDX: 0000000020004080 RSI: 0000200000000240 RDI: 000000000000000a RBP: 00007f1167e327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1168016038 R14: 00007f1168015fa0 R15: 00007ffdec745728 team0: Port device wlan1 removed