======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.2.63924/2395 is trying to acquire lock:
ffff88820536e5a8 (kn->active#11){++++}-{0:0}, at: __kernfs_remove+0x3cf/0x660

but task is already holding lock:
ffff88822c9f0788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: ieee80211_remove_interfaces+0x132/0x6d0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&rdev->wiphy.mtx){+.+.}-{4:4}:
       __mutex_lock+0x19f/0x1300
       ieee80211_change_mac+0xb5/0x1410
       netif_set_mac_address+0x317/0x4e0
       dev_set_mac_address_user+0x137/0x270
       dev_ioctl+0x7b4/0x1150
       sock_do_ioctl+0x23e/0x320
       sock_ioctl+0x5c6/0x7f0
       __se_sys_ioctl+0xfc/0x170
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (dev_addr_sem){++++}-{4:4}:
       down_read+0x47/0x2e0
       address_show+0x25/0x250
       dev_attr_show+0x58/0xc0
       sysfs_kf_seq_show+0x310/0x490
       seq_read_iter+0x4ef/0xe10
       vfs_read+0x582/0xa70
       ksys_read+0x150/0x270
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (kn->active#11){++++}-{0:0}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0xf0/0x2e0
       kernfs_drain+0x284/0x600
       __kernfs_remove+0x3cf/0x660
       kernfs_remove_by_name_ns+0xaf/0x130
       sysfs_remove_group+0xfc/0x2e0
       sysfs_remove_groups+0x54/0xb0
       device_remove_attrs+0x229/0x280
       device_del+0x51f/0x8f0
       unregister_netdevice_many_notify+0x1e0e/0x2370
       unregister_netdevice_queue+0x31f/0x360
       _cfg80211_unregister_wdev+0x155/0x570
       ieee80211_remove_interfaces+0x49c/0x6d0
       ieee80211_unregister_hw+0x5d/0x2c0
       mac80211_hwsim_del_radio+0x28a/0x490
       mac80211_hwsim_netlink_notify+0xfae/0x1310
       notifier_call_chain+0x1be/0x400
       blocking_notifier_call_chain+0x6a/0x90
       netlink_release+0x123b/0x1ad0
       sock_close+0xc3/0x240
       __fput+0x44f/0xa70
       fput_close_sync+0x11f/0x240
       __x64_sys_close+0x7e/0x110
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  kn->active#11 --> dev_addr_sem --> &rdev->wiphy.mtx

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&rdev->wiphy.mtx);
                               lock(dev_addr_sem);
                               lock(&rdev->wiphy.mtx);
  lock(kn->active#11);

 *** DEADLOCK ***

4 locks held by syz.2.63924/2395:
 #0: ffff8881c79f2c08 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x9b/0x240
 #1: ffffffff8fc338b0 ((netlink_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x54/0x90
 #2: ffffffff8fbc7488 (rtnl_mutex){+.+.}-{4:4}, at: ieee80211_unregister_hw+0x55/0x2c0
 #3: ffff88822c9f0788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: ieee80211_remove_interfaces+0x132/0x6d0

stack backtrace:
CPU: 1 UID: 0 PID: 2395 Comm: syz.2.63924 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_circular_bug+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a5/0x2cf0
 lock_acquire+0xf0/0x2e0
 kernfs_drain+0x284/0x600
 __kernfs_remove+0x3cf/0x660
 kernfs_remove_by_name_ns+0xaf/0x130
 sysfs_remove_group+0xfc/0x2e0
 sysfs_remove_groups+0x54/0xb0
 device_remove_attrs+0x229/0x280
 device_del+0x51f/0x8f0
 unregister_netdevice_many_notify+0x1e0e/0x2370
 unregister_netdevice_queue+0x31f/0x360
 _cfg80211_unregister_wdev+0x155/0x570
 ieee80211_remove_interfaces+0x49c/0x6d0
 ieee80211_unregister_hw+0x5d/0x2c0
 mac80211_hwsim_del_radio+0x28a/0x490
 mac80211_hwsim_netlink_notify+0xfae/0x1310
 notifier_call_chain+0x1be/0x400
 blocking_notifier_call_chain+0x6a/0x90
 netlink_release+0x123b/0x1ad0
 sock_close+0xc3/0x240
 __fput+0x44f/0xa70
 fput_close_sync+0x11f/0x240
 __x64_sys_close+0x7e/0x110
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5acef9c799
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:00007f5acd1f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007f5acf215fa0 RCX: 00007f5acef9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f5acf032bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5acf216038 R14: 00007f5acf215fa0 R15: 00007ffd21e28b48
 </TASK>
