tipc: Left network mode
============================================
WARNING: possible recursive locking detected
6.15.0-rc1-syzkaller-00374-gac1df712442c #0 Not tainted
--------------------------------------------
kworker/u8:4/63 is trying to acquire lock:
ffff88807c874d30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2750 [inline]
ffff88807c874d30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline]
ffff88807c874d30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: dev_set_allmulti+0x11c/0x270 net/core/dev_api.c:288

but task is already holding lock:
ffff88807c874d30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2750 [inline]
ffff88807c874d30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline]
ffff88807c874d30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x5a1/0x2500 net/core/dev.c:11992
and the lock comparison function returns 0:

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&dev_instance_lock_key#3);
  lock(&dev_instance_lock_key#3);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

5 locks held by kworker/u8:4/63:
 #0: ffff88801bef6148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
 #0: ffff88801bef6148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
 #1: ffffc90001557c60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #1: ffffc90001557c60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
 #2: ffffffff900f1b50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x100/0x940 net/core/net_namespace.c:660
 #3: ffffffff900fe688 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0xde/0x880 net/core/dev.c:12576
 #4: ffff88807c874d30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2750 [inline]
 #4: ffff88807c874d30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline]
 #4: ffff88807c874d30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x5a1/0x2500 net/core/dev.c:11992

stack backtrace:
CPU: 0 UID: 0 PID: 63 Comm: kworker/u8:4 Not tainted 6.15.0-rc1-syzkaller-00374-gac1df712442c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x2be/0x2d0 kernel/locking/lockdep.c:3042
 check_deadlock kernel/locking/lockdep.c:3094 [inline]
 validate_chain+0x928/0x24e0 kernel/locking/lockdep.c:3896
 __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
 netdev_lock include/linux/netdevice.h:2750 [inline]
 netdev_lock_ops include/net/netdev_lock.h:42 [inline]
 dev_set_allmulti+0x11c/0x270 net/core/dev_api.c:288
 macvlan_stop+0x20f/0x420 drivers/net/macvlan.c:704
 __dev_close_many+0x3d7/0x760 net/core/dev.c:1752
 dev_close_many+0x250/0x4c0 net/core/dev.c:1777
 unregister_netdevice_many_notify+0x628/0x2500 net/core/dev.c:11994
 unregister_netdevice_many net/core/dev.c:12088 [inline]
 default_device_exit_batch+0x7ff/0x880 net/core/dev.c:12590
 ops_exit_list net/core/net_namespace.c:206 [inline]
 ops_undo_list+0x47f/0x8b0 net/core/net_namespace.c:250
 cleanup_net+0x530/0x940 net/core/net_namespace.c:684
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>