netlink: 48 bytes leftover after parsing attributes in process `syz-executor.1'. ====================================================== WARNING: possible circular locking dependency detected 6.3.0-syzkaller-07921-g042334a8d424 #0 Not tainted ------------------------------------------------------ syz-executor.1/29724 is trying to acquire lock: ffff888047638cf8 (team->team_lock_key#5){+.+.}-{3:3}, at: team_del_slave+0x31/0x1c0 drivers/net/team/team.c:1998 but task is already holding lock: ffff88807a218728 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0xfb/0x190 net/wireless/nl80211.c:4376 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+0x12f/0x1350 kernel/locking/mutex.c:747 wiphy_lock include/net/cfg80211.h:5737 [inline] ieee80211_open net/mac80211/iface.c:437 [inline] ieee80211_open+0x193/0x250 net/mac80211/iface.c:424 __dev_open+0x297/0x4d0 net/core/dev.c:1415 dev_open net/core/dev.c:1451 [inline] dev_open+0xec/0x150 net/core/dev.c:1444 team_port_add drivers/net/team/team.c:1215 [inline] team_add_slave+0xa92/0x2130 drivers/net/team/team.c:1984 do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2626 do_setlink+0x89e/0x3d30 net/core/rtnetlink.c:2829 __rtnl_newlink+0xd69/0x1840 net/core/rtnetlink.c:3626 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3673 rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6395 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2503 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (team->team_lock_key#5){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3108 [inline] check_prevs_add kernel/locking/lockdep.c:3227 [inline] validate_chain kernel/locking/lockdep.c:3842 [inline] __lock_acquire+0x2f21/0x5df0 kernel/locking/lockdep.c:5074 lock_acquire kernel/locking/lockdep.c:5691 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5656 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 team_del_slave+0x31/0x1c0 drivers/net/team/team.c:1998 team_device_event+0xd7/0xad0 drivers/net/team/team.c:3022 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1935 call_netdevice_notifiers_extack net/core/dev.c:1973 [inline] call_netdevice_notifiers net/core/dev.c:1987 [inline] unregister_netdevice_many_notify+0x75f/0x18c0 net/core/dev.c:10882 unregister_netdevice_many net/core/dev.c:10938 [inline] unregister_netdevice_queue+0x2e5/0x3c0 net/core/dev.c:10818 unregister_netdevice include/linux/netdevice.h:3109 [inline] _cfg80211_unregister_wdev+0x64a/0x830 net/wireless/core.c:1157 ieee80211_if_remove+0x1e3/0x390 net/mac80211/iface.c:2239 ieee80211_del_iface+0x16/0x20 net/mac80211/cfg.c:202 rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline] cfg80211_remove_virtual_intf+0xd3/0x400 net/wireless/util.c:2574 nl80211_del_interface+0x106/0x190 net/wireless/nl80211.c:4378 genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 net/netlink/genetlink.c:968 genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline] genl_rcv_msg+0x4ff/0x7e0 net/netlink/genetlink.c:1065 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2503 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rdev->wiphy.mtx); lock(team->team_lock_key#5); lock(&rdev->wiphy.mtx); lock(team->team_lock_key#5); *** DEADLOCK *** 3 locks held by syz-executor.1/29724: #0: ffffffff8e19b870 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1075 #1: ffffffff8e108368 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0xb4/0xab0 net/wireless/nl80211.c:16380 #2: ffff88807a218728 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0xfb/0x190 net/wireless/nl80211.c:4376 stack backtrace: CPU: 1 PID: 29724 Comm: syz-executor.1 Not tainted 6.3.0-syzkaller-07921-g042334a8d424 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3108 [inline] check_prevs_add kernel/locking/lockdep.c:3227 [inline] validate_chain kernel/locking/lockdep.c:3842 [inline] __lock_acquire+0x2f21/0x5df0 kernel/locking/lockdep.c:5074 lock_acquire kernel/locking/lockdep.c:5691 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5656 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 team_del_slave+0x31/0x1c0 drivers/net/team/team.c:1998 team_device_event+0xd7/0xad0 drivers/net/team/team.c:3022 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1935 call_netdevice_notifiers_extack net/core/dev.c:1973 [inline] call_netdevice_notifiers net/core/dev.c:1987 [inline] unregister_netdevice_many_notify+0x75f/0x18c0 net/core/dev.c:10882 unregister_netdevice_many net/core/dev.c:10938 [inline] unregister_netdevice_queue+0x2e5/0x3c0 net/core/dev.c:10818 unregister_netdevice include/linux/netdevice.h:3109 [inline] _cfg80211_unregister_wdev+0x64a/0x830 net/wireless/core.c:1157 ieee80211_if_remove+0x1e3/0x390 net/mac80211/iface.c:2239 ieee80211_del_iface+0x16/0x20 net/mac80211/cfg.c:202 rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline] cfg80211_remove_virtual_intf+0xd3/0x400 net/wireless/util.c:2574 nl80211_del_interface+0x106/0x190 net/wireless/nl80211.c:4378 genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 net/netlink/genetlink.c:968 genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline] genl_rcv_msg+0x4ff/0x7e0 net/netlink/genetlink.c:1065 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2503 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f9d18a8c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f9d19713168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9d18babf80 RCX: 00007f9d18a8c169 RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000000000004 RBP: 00007f9d18ae7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff0edf815f R14: 00007f9d19713300 R15: 0000000000022000 mac80211_hwsim hwsim4 wlan0 (unregistering): left promiscuous mode team0: Port device wlan0 removed