=====================================
WARNING: bad unlock balance detected!
6.15.0-rc1-syzkaller-g2fe2b96c3818 #0 Not tainted
-------------------------------------
syz.0.92/7041 is trying to release lock (&dev_instance_lock_key) at:
[<ffff800089b15adc>] netdev_unlock include/linux/netdevice.h:2756 [inline]
[<ffff800089b15adc>] netdev_unlock_ops include/net/netdev_lock.h:48 [inline]
[<ffff800089b15adc>] do_setlink+0x2ec0/0x36f0 net/core/rtnetlink.c:3406
but there are no more locks to release!

other info that might help us debug this:
1 lock held by syz.0.92/7041:
 #0: ffff8000930815a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #0: ffff8000930815a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
 #0: ffff8000930815a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xacc/0x185c net/core/rtnetlink.c:4064

stack backtrace:
CPU: 0 UID: 0 PID: 7041 Comm: syz.0.92 Not tainted 6.15.0-rc1-syzkaller-g2fe2b96c3818 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_unlock_imbalance_bug+0x19c/0x1a8 kernel/locking/lockdep.c:5296
 __lock_release kernel/locking/lockdep.c:-1 [inline]
 lock_release+0x244/0x3a0 kernel/locking/lockdep.c:5887
 __mutex_unlock_slowpath+0xec/0x734 kernel/locking/mutex.c:907
 mutex_unlock+0x18/0x24 kernel/locking/mutex.c:539
 netdev_unlock include/linux/netdevice.h:2756 [inline]
 netdev_unlock_ops include/net/netdev_lock.h:48 [inline]
 do_setlink+0x2ec0/0x36f0 net/core/rtnetlink.c:3406
 rtnl_changelink net/core/rtnetlink.c:3769 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
 rtnl_newlink+0x123c/0x185c net/core/rtnetlink.c:4065
 rtnetlink_rcv_msg+0x670/0xa9c net/core/rtnetlink.c:6955
 netlink_rcv_skb+0x234/0x408 net/netlink/af_netlink.c:2534
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6982
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x668/0x8a4 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x708/0xaa4 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 ____sys_sendmsg+0x578/0x890 net/socket.c:2566
 ___sys_sendmsg net/socket.c:2620 [inline]
 __sys_sendmsg+0x238/0x304 net/socket.c:2652
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2655
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600