[   16.852680][ T3892] 8021q: adding VLAN 0 to HW filter on device bond0
[   16.858076][ T3892] eql: remember to turn off Van-Jacobson compression on your slave devices
[   16.902166][  T263] gvnic 0000:00:00.0 enp0s0: Device link is up.
[   16.905568][ T1954] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s0: link becomes ready
Starting sshd: OK

syzkaller
Warning: Permanently added '10.128.1.2' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   33.908637][ T4306] 
[   33.909238][ T4306] ============================================
[   33.910757][ T4306] WARNING: possible recursive locking detected
[   33.912305][ T4306] 6.1.15-syzkaller #0 Not tainted
[   33.913558][ T4306] --------------------------------------------
[   33.915138][ T4306] syz-executor140/4306 is trying to acquire lock:
[   33.916715][ T4306] ffff0000d4d5e130 (sk_lock-AF_PPPOX){+.+.}-{0:0}, at: l2tp_tunnel_register+0x888/0x19f8
[   33.919276][ T4306] 
[   33.919276][ T4306] but task is already holding lock:
[   33.921118][ T4306] ffff0000cf697130 (sk_lock-AF_PPPOX){+.+.}-{0:0}, at: pppol2tp_connect+0x53c/0x1348
[   33.923538][ T4306] 
[   33.923538][ T4306] other info that might help us debug this:
[   33.925547][ T4306]  Possible unsafe locking scenario:
[   33.925547][ T4306] 
[   33.927427][ T4306]        CPU0
[   33.928260][ T4306]        ----
[   33.929088][ T4306]   lock(sk_lock-AF_PPPOX);
[   33.930194][ T4306]   lock(sk_lock-AF_PPPOX);
[   33.931312][ T4306] 
[   33.931312][ T4306]  *** DEADLOCK ***
[   33.931312][ T4306] 
[   33.933324][ T4306]  May be due to missing lock nesting notation
[   33.933324][ T4306] 
[   33.935403][ T4306] 1 lock held by syz-executor140/4306:
[   33.936761][ T4306]  #0: ffff0000cf697130 (sk_lock-AF_PPPOX){+.+.}-{0:0}, at: pppol2tp_connect+0x53c/0x1348
[   33.939259][ T4306] 
[   33.939259][ T4306] stack backtrace:
[   33.940713][ T4306] CPU: 0 PID: 4306 Comm: syz-executor140 Not tainted 6.1.15-syzkaller #0
[   33.942893][ T4306] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
[   33.945441][ T4306] Call trace:
[   33.946287][ T4306]  dump_backtrace+0x1c8/0x1f4
[   33.947417][ T4306]  show_stack+0x2c/0x3c
[   33.948432][ T4306]  dump_stack_lvl+0x108/0x170
[   33.949588][ T4306]  dump_stack+0x1c/0x58
[   33.950597][ T4306]  __lock_acquire+0x6310/0x764c
[   33.951818][ T4306]  lock_acquire+0x2f8/0x8dc
[   33.952961][ T4306]  lock_sock_nested+0x78/0x138
[   33.954195][ T4306]  l2tp_tunnel_register+0x888/0x19f8
[   33.955497][ T4306]  pppol2tp_connect+0x944/0x1348
[   33.956724][ T4306]  __sys_connect+0x268/0x290
[   33.957907][ T4306]  __arm64_sys_connect+0x7c/0x94
[   33.959139][ T4306]  invoke_syscall+0x98/0x2c0
[   33.960292][ T4306]  el0_svc_common+0x138/0x258
[   33.961465][ T4306]  do_el0_svc+0x64/0x218
[   33.962526][ T4306]  el0_svc+0x58/0x168
[   33.963533][ T4306]  el0t_64_sync_handler+0x84/0xf0
[   33.964812][ T4306]  el0t_64_sync+0x18c/0x190