[    2.086270] ip (246) used greatest stack depth: 12152 bytes left
[    3.147715] ------------[ cut here ]------------
[    3.147788] refcount_t: underflow; use-after-free.
[    3.147838] WARNING: CPU: 0 PID: 66 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    3.147916] Modules linked in:
[    3.147955] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    3.148041] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.148094] Workqueue: netns cleanup_net
[    3.148128] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    3.148165] Code: 82 e8 48 df ba ff 90 0f 0b 90 90 c3 80 3d c9 50 ec 00 00 75 89 c6 05 c0 50 ec 00 01 90 48 c7 c7 c8 4a b2 82 e8 25 df ba ff 90 <0f> 0b 90 90 c3 80 3d a4 50 ec 00 00 0f 85 62 ff ff ff c6 05 97 50
[    3.148326] RSP: 0018:ffffa8f3c024fd50 EFLAGS: 00010286
[    3.148365] RAX: 0000000000000000 RBX: ffffa8f3c024fd60 RCX: 00000000ffffdfff
[    3.148428] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    3.148483] RBP: ffffa8f3c024f878 R08: ffffffff82f5ca28 R09: 00000000ffffdfff
[    3.148534] R10: ffffffff82e7ca40 R11: ffffffff82f2ca40 R12: dead000000000122
[    3.148583] R13: 00000000fffb77d1 R14: 0000000000000001 R15: ffff9d5184be1000
[    3.148633] FS:  0000000000000000(0000) GS:ffff9d523b5c0000(0000) knlGS:0000000000000000
[    3.148702] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.148748] CR2: 00007ffcf85224a8 CR3: 0000000001aec005 CR4: 0000000000772ef0
[    3.148801] PKRU: 55555554
[    3.148823] Call Trace:
[    3.148842]  <TASK>
[    3.148868]  netdev_run_todo+0x21a/0x550
[    3.148907]  ops_undo_list+0x1e3/0x1f0
[    3.148941]  cleanup_net+0x1b7/0x2b0
[    3.148986]  process_one_work+0x162/0x380
[    3.149022]  worker_thread+0x299/0x3c0
[    3.149053]  ? rescuer_thread+0x4c0/0x4c0
[    3.149089]  kthread+0x101/0x1f0
[    3.149124]  ? kthreads_online_cpu+0x110/0x110
[    3.149163]  ? kthreads_online_cpu+0x110/0x110
[    3.149208]  ret_from_fork+0x11c/0x140
[    3.149243]  ? kthreads_online_cpu+0x110/0x110
[    3.149288]  ret_from_fork_asm+0x11/0x20
[    3.149322]  </TASK>
[    3.149343] ---[ end trace 0000000000000000 ]---
[    6.296745] netem: version 1.3
[   16.222222] mptcp_connect (1153) used greatest stack depth: 12072 bytes left
[   20.371717] mptcp_connect (1528) used greatest stack depth: 11720 bytes left
[   33.233018] mptcp_connect (2285) used greatest stack depth: 11560 bytes left