[   16.942231][ T3893] 8021q: adding VLAN 0 to HW filter on device bond0
[   16.951895][ T3893] eql: remember to turn off Van-Jacobson compression on your slave devices
[   16.998944][   T11] gvnic 0000:00:00.0 enp0s0: Device link is up.
[   17.003399][  T111] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s0: link becomes ready
Starting sshd: OK

syzkaller
Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   34.564949][ T4314] 
[   34.565641][ T4314] ============================================
[   34.567167][ T4314] WARNING: possible recursive locking detected
[   34.568679][ T4314] 6.1.15-syzkaller #0 Not tainted
[   34.569943][ T4314] --------------------------------------------
[   34.571569][ T4314] syz-executor322/4314 is trying to acquire lock:
[   34.573183][ T4314] ffff0000c232e130 (sk_lock-AF_PPPOX){+.+.}-{0:0}, at: l2tp_tunnel_register+0x888/0x19f8
[   34.575710][ T4314] 
[   34.575710][ T4314] but task is already holding lock:
[   34.577597][ T4314] ffff0000c7cbd130 (sk_lock-AF_PPPOX){+.+.}-{0:0}, at: pppol2tp_connect+0x53c/0x1348
[   34.580038][ T4314] 
[   34.580038][ T4314] other info that might help us debug this:
[   34.582094][ T4314]  Possible unsafe locking scenario:
[   34.582094][ T4314] 
[   34.583974][ T4314]        CPU0
[   34.584808][ T4314]        ----
[   34.585670][ T4314]   lock(sk_lock-AF_PPPOX);
[   34.586832][ T4314]   lock(sk_lock-AF_PPPOX);
[   34.587984][ T4314] 
[   34.587984][ T4314]  *** DEADLOCK ***
[   34.587984][ T4314] 
[   34.590035][ T4314]  May be due to missing lock nesting notation
[   34.590035][ T4314] 
[   34.592138][ T4314] 1 lock held by syz-executor322/4314:
[   34.593497][ T4314]  #0: ffff0000c7cbd130 (sk_lock-AF_PPPOX){+.+.}-{0:0}, at: pppol2tp_connect+0x53c/0x1348
[   34.596081][ T4314] 
[   34.596081][ T4314] stack backtrace:
[   34.597589][ T4314] CPU: 0 PID: 4314 Comm: syz-executor322 Not tainted 6.1.15-syzkaller #0
[   34.599660][ T4314] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
[   34.602247][ T4314] Call trace:
[   34.603070][ T4314]  dump_backtrace+0x1c8/0x1f4
[   34.604236][ T4314]  show_stack+0x2c/0x3c
[   34.605335][ T4314]  dump_stack_lvl+0x108/0x170
[   34.606477][ T4314]  dump_stack+0x1c/0x58
[   34.607537][ T4314]  __lock_acquire+0x6310/0x764c
[   34.608767][ T4314]  lock_acquire+0x2f8/0x8dc
[   34.609884][ T4314]  lock_sock_nested+0x78/0x138
[   34.611103][ T4314]  l2tp_tunnel_register+0x888/0x19f8
[   34.612414][ T4314]  pppol2tp_connect+0x944/0x1348
[   34.613580][ T4314]  __sys_connect+0x268/0x290
[   34.614667][ T4314]  __arm64_sys_connect+0x7c/0x94
[   34.615885][ T4314]  invoke_syscall+0x98/0x2c0
[   34.617035][ T4314]  el0_svc_common+0x138/0x258
[   34.618244][ T4314]  do_el0_svc+0x64/0x218
[   34.619300][ T4314]  el0_svc+0x58/0x168
[   34.620357][ T4314]  el0t_64_sync_handler+0x84/0xf0
[   34.621630][ T4314]  el0t_64_sync+0x18c/0x190