syzbot

======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:7/1098 is trying to acquire lock:
ffff8880717f0d80 (team->team_lock_key#2){+.+.}-{3:3}, at: team_del_slave+0x31/0x1b0 drivers/net/team/team.c:2004

but task is already holding lock:
ffff88802c328768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5777 [inline]
ffff88802c328768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: ieee80211_remove_interfaces+0x2bd/0x690 net/mac80211/iface.c:2344

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+0x135/0xc80 kernel/locking/mutex.c:747
       wiphy_lock include/net/cfg80211.h:5777 [inline]
       ieee80211_open+0x144/0x200 net/mac80211/iface.c:470
       __dev_open+0x2cb/0x430 net/core/dev.c:1519
       dev_open+0xab/0x190 net/core/dev.c:1555
       team_port_add drivers/net/team/team.c:1225 [inline]
       team_add_slave+0x709/0x2880 drivers/net/team/team.c:1990
       do_set_master net/core/rtnetlink.c:2710 [inline]
       do_setlink+0xcde/0x3f40 net/core/rtnetlink.c:2916
       __rtnl_newlink net/core/rtnetlink.c:3707 [inline]
       rtnl_newlink+0x1848/0x2170 net/core/rtnetlink.c:3754
       rtnetlink_rcv_msg+0x843/0xf90 net/core/rtnetlink.c:6476
       netlink_rcv_skb+0x235/0x4c0 net/netlink/af_netlink.c:2550
       netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
       netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346
       netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899
       sock_sendmsg_nosec net/socket.c:730 [inline]
       __sock_sendmsg net/socket.c:745 [inline]
       ____sys_sendmsg+0x61b/0x980 net/socket.c:2595
       ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649
       __sys_sendmsg net/socket.c:2678 [inline]
       __do_sys_sendmsg net/socket.c:2687 [inline]
       __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (team->team_lock_key#2){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
       lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747
       team_del_slave+0x31/0x1b0 drivers/net/team/team.c:2004
       team_device_event+0x297/0xa30 drivers/net/team/team.c:3048
       notifier_call_chain+0x18f/0x380 kernel/notifier.c:93
       call_netdevice_notifiers_extack net/core/dev.c:2077 [inline]
       call_netdevice_notifiers net/core/dev.c:2091 [inline]
       unregister_netdevice_many_notify+0x1037/0x1910 net/core/dev.c:11124
       unregister_netdevice_many net/core/dev.c:11180 [inline]
       unregister_netdevice_queue+0x2e9/0x330 net/core/dev.c:11060
       unregister_netdevice include/linux/netdevice.h:3137 [inline]
       _cfg80211_unregister_wdev+0x16d/0x580 net/wireless/core.c:1216
       ieee80211_remove_interfaces+0x4b3/0x690 net/mac80211/iface.c:2363
       ieee80211_unregister_hw+0x5d/0x2a0 net/mac80211/main.c:1517
       mac80211_hwsim_del_radio+0x289/0x480 drivers/net/wireless/virtual/mac80211_hwsim.c:5412
       hwsim_exit_net+0x58d/0x650 drivers/net/wireless/virtual/mac80211_hwsim.c:6290
       ops_exit_list net/core/net_namespace.c:173 [inline]
       cleanup_net+0x707/0xbb0 net/core/net_namespace.c:652
       process_one_work kernel/workqueue.c:2653 [inline]
       process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
       worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
       kthread+0x2fa/0x390 kernel/kthread.c:388
       ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&rdev->wiphy.mtx);
                               lock(team->team_lock_key#2);
                               lock(&rdev->wiphy.mtx);
  lock(team->team_lock_key#2);

 *** DEADLOCK ***

5 locks held by kworker/u4:7/1098:
 #0: ffff88801a25c938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
 #0: ffff88801a25c938 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2730
 #1: ffffc900046ffd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
 #1: ffffc900046ffd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2730
 #2: ffffffff8e3c8b10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x14c/0xbb0 net/core/net_namespace.c:606
 #3: ffffffff8e3d5b08 (rtnl_mutex){+.+.}-{3:3}, at: ieee80211_unregister_hw+0x55/0x2a0 net/mac80211/main.c:1510
 #4: ffff88802c328768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5777 [inline]
 #4: ffff88802c328768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: ieee80211_remove_interfaces+0x2bd/0x690 net/mac80211/iface.c:2344

stack backtrace:
CPU: 1 PID: 1098 Comm: kworker/u4:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747
 team_del_slave+0x31/0x1b0 drivers/net/team/team.c:2004
 team_device_event+0x297/0xa30 drivers/net/team/team.c:3048
 notifier_call_chain+0x18f/0x380 kernel/notifier.c:93
 call_netdevice_notifiers_extack net/core/dev.c:2077 [inline]
 call_netdevice_notifiers net/core/dev.c:2091 [inline]
 unregister_netdevice_many_notify+0x1037/0x1910 net/core/dev.c:11124
 unregister_netdevice_many net/core/dev.c:11180 [inline]
 unregister_netdevice_queue+0x2e9/0x330 net/core/dev.c:11060
 unregister_netdevice include/linux/netdevice.h:3137 [inline]
 _cfg80211_unregister_wdev+0x16d/0x580 net/wireless/core.c:1216
 ieee80211_remove_interfaces+0x4b3/0x690 net/mac80211/iface.c:2363
 ieee80211_unregister_hw+0x5d/0x2a0 net/mac80211/main.c:1517
 mac80211_hwsim_del_radio+0x289/0x480 drivers/net/wireless/virtual/mac80211_hwsim.c:5412
 hwsim_exit_net+0x58d/0x650 drivers/net/wireless/virtual/mac80211_hwsim.c:6290
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x707/0xbb0 net/core/net_namespace.c:652
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
team0: Port device wlan1 removed
hsr_slave_0: left promiscuous mode
hsr_slave_1: left promiscuous mode
batman_adv: batadv0: Interface deactivated: batadv_slave_0
batman_adv: batadv0: Removing interface: batadv_slave_0
batman_adv: batadv0: Interface deactivated: batadv_slave_1
batman_adv: batadv0: Removing interface: batadv_slave_1
bridge_slave_1: left allmulticast mode
bridge_slave_1: left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
bridge_slave_0: left allmulticast mode
bridge_slave_0: left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
veth1_macvtap: left promiscuous mode
veth0_macvtap: left promiscuous mode
veth1_vlan: left promiscuous mode
veth0_vlan: left promiscuous mode
team0 (unregistering): Port device team_slave_1 removed
team0 (unregistering): Port device team_slave_0 removed
bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): Released all slaves
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50