[    2.237104] ip (259) used greatest stack depth: 12136 bytes left
[    2.826887] eth1: renamed from tmp
[    2.941886] eth2: renamed from tmp
[    3.073943] l2tp_core: L2TP core driver, V2.0
[    3.075465] l2tp_netlink: L2TP netlink interface
[    3.088461] l2tp_ip: L2TP IP encapsulation support (L2TPv3)
[    3.112406] l2tp_eth: L2TP ethernet pseudowire support (L2TPv3)
[    3.227065] l2tp_ip6: L2TP IP encapsulation support for IPv6 (L2TPv3)
[    3.443565] Initializing XFRM netlink socket
[    4.177745] ------------[ cut here ]------------
[    4.177833] refcount_t: underflow; use-after-free.
[    4.177912] WARNING: CPU: 3 PID: 322 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    4.178012] Modules linked in: xfrm_user l2tp_ip6 l2tp_eth l2tp_ip l2tp_netlink l2tp_core
[    4.178111] CPU: 3 UID: 0 PID: 322 Comm: kworker/u20:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    4.178213] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.178280] Workqueue: l2tp l2tp_session_del_work [l2tp_core]
[    4.178361] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    4.178423] Code: 95 e8 e8 54 ba ff 90 0f 0b 90 90 c3 80 3d 00 e6 2b 01 00 75 89 c6 05 f7 e5 2b 01 01 90 48 c7 c7 f8 48 f5 95 e8 c5 54 ba ff 90 <0f> 0b 90 90 c3 80 3d db e5 2b 01 00 0f 85 62 ff ff ff c6 05 ce e5
[    4.178606] RSP: 0018:ffffbac9c078fda8 EFLAGS: 00010286
[    4.178659] RAX: 0000000000000000 RBX: ffffbac9c078fdb8 RCX: 00000000ffffdfff
[    4.178742] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    4.178822] RBP: ffffbac9c078f8b0 R08: ffffffff9675ba28 R09: 00000000ffffdfff
[    4.178904] R10: ffffffff9667ba40 R11: ffffffff9672ba40 R12: dead000000000122
[    4.178986] R13: 00000000fffb7bee R14: 0000000000000001 R15: ffff983a0871e000
[    4.179073] FS:  0000000000000000(0000) GS:ffff983aa7f11000(0000) knlGS:0000000000000000
[    4.179162] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.179239] CR2: 00007fff52184938 CR3: 0000000008598001 CR4: 0000000000772ef0
[    4.179326] PKRU: 55555554
[    4.179352] Call Trace:
[    4.179384]  <TASK>
[    4.179420]  netdev_run_todo+0x21a/0x550
[    4.179475]  l2tp_eth_delete+0x2f/0x50 [l2tp_eth]
[    4.179541]  l2tp_session_del_work+0x1c3/0x270 [l2tp_core]
[    4.179606]  process_one_work+0x162/0x380
[    4.179669]  worker_thread+0x299/0x3c0
[    4.179725]  ? rescuer_thread+0x4c0/0x4c0
[    4.179771]  kthread+0x101/0x1f0
[    4.179823]  ? kthreads_online_cpu+0x110/0x110
[    4.179882]  ? kthreads_online_cpu+0x110/0x110
[    4.179934]  ret_from_fork+0x11c/0x140
[    4.179998]  ? kthreads_online_cpu+0x110/0x110
[    4.180059]  ret_from_fork_asm+0x11/0x20
[    4.180118]  </TASK>
[    4.180147] ---[ end trace 0000000000000000 ]---