netlink: 'syz-executor298': attribute type 10 has an invalid length. netlink: 40 bytes leftover after parsing attributes in process `syz-executor298'. mac80211_hwsim hwsim2 wlan0: entered allmulticast mode team0: Port device wlan0 added ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-00471-g119009db2674 #0 Not tainted ------------------------------------------------------ syz-executor298/5844 is trying to acquire lock: ffff888034b68e00 (team->team_lock_key){+.+.}-{4:4}, at: team_del_slave+0x32/0x1d0 drivers/net/team/team_core.c:2003 but task is already holding lock: ffff888023730768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: nl80211_del_interface+0x11a/0x140 net/wireless/nl80211.c:4574 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&rdev->wiphy.mtx){+.+.}-{4:4}: lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746 class_wiphy_constructor include/net/cfg80211.h:6092 [inline] ieee80211_open+0xe9/0x1e0 net/mac80211/iface.c:445 __dev_open+0x484/0x900 net/core/dev.c:1629 netif_open+0xaf/0x1b0 net/core/dev.c:1652 dev_open+0x13e/0x260 net/core/dev_api.c:200 team_port_add drivers/net/team/team_core.c:1230 [inline] team_add_slave+0xac0/0x28b0 drivers/net/team/team_core.c:1989 do_set_master+0x579/0x730 net/core/rtnetlink.c:2946 do_setlink+0xf76/0x4390 net/core/rtnetlink.c:3159 rtnl_setlink+0x855/0xc00 net/core/rtnetlink.c:3466 rtnetlink_rcv_msg+0x80f/0xd70 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (team->team_lock_key){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746 team_del_slave+0x32/0x1d0 drivers/net/team/team_core.c:2003 team_device_event+0x200/0x5b0 drivers/net/team/team_core.c:3000 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] unregister_netdevice_many_notify+0x16b7/0x2640 net/core/dev.c:11982 unregister_netdevice_many net/core/dev.c:12046 [inline] unregister_netdevice_queue+0x383/0x400 net/core/dev.c:11889 unregister_netdevice include/linux/netdevice.h:3374 [inline] _cfg80211_unregister_wdev+0x163/0x590 net/wireless/core.c:1256 ieee80211_if_remove+0x25d/0x320 net/mac80211/iface.c:2259 ieee80211_del_iface+0x19/0x30 net/mac80211/cfg.c:224 rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline] cfg80211_remove_virtual_intf+0x23f/0x410 net/wireless/util.c:2871 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0xb38/0xf00 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rdev->wiphy.mtx); lock(team->team_lock_key); lock(&rdev->wiphy.mtx); lock(team->team_lock_key); *** DEADLOCK *** 3 locks held by syz-executor298/5844: #0: ffffffff9014f710 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff900eb288 (rtnl_mutex){+.+.}-{4:4}, at: nl80211_pre_doit+0x5f/0x8b0 net/wireless/nl80211.c:16693 #2: ffff888023730768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: nl80211_del_interface+0x11a/0x140 net/wireless/nl80211.c:4574 stack backtrace: CPU: 1 UID: 0 PID: 5844 Comm: syz-executor298 Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2079 check_noncircular+0x142/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746 team_del_slave+0x32/0x1d0 drivers/net/team/team_core.c:2003 team_device_event+0x200/0x5b0 drivers/net/team/team_core.c:3000 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] unregister_netdevice_many_notify+0x16b7/0x2640 net/core/dev.c:11982 unregister_netdevice_many net/core/dev.c:12046 [inline] unregister_netdevice_queue+0x383/0x400 net/core/dev.c:11889 unregister_netdevice include/linux/netdevice.h:3374 [inline] _cfg80211_unregister_wdev+0x163/0x590 net/wireless/core.c:1256 ieee80211_if_remove+0x25d/0x320 net/mac80211/iface.c:2259 ieee80211_del_iface+0x19/0x30 net/mac80211/cfg.c:224 rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline] cfg80211_remove_virtual_intf+0x23f/0x410 net/wireless/util.c:2871 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0xb38/0xf00 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f44c0f38c19 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe4c4560e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f44c0f38c19 RDX: 0000000000000000 RSI: 0000200000000400 RDI: 0000000000000004 RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f44c0f86464 R13: 00007ffe4c45612c R14: 00007ffe4c456160 R15: 0000000000000048 team0: Port device wlan0 removed