[    1.492053] ip (254) used greatest stack depth: 12152 bytes left
[    2.690808] ------------[ cut here ]------------
[    2.690900] refcount_t: underflow; use-after-free.
[    2.690970] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.691047] Modules linked in:
[    2.691095] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.691195] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.691261] Workqueue: netns cleanup_net
[    2.691334] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.691391] Code: 88 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 12 88 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
[    2.691541] RSP: 0018:ffffa79ac0067d50 EFLAGS: 00010286
[    2.691596] RAX: 0000000000000000 RBX: ffffa79ac0067d60 RCX: 00000000ffffdfff
[    2.691685] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.691759] RBP: ffffa79ac0067878 R08: ffffffff8855ca28 R09: 00000000ffffdfff
[    2.691848] R10: ffffffff8847ca40 R11: ffffffff8852ca40 R12: dead000000000122
[    2.691937] R13: 00000000fffb762b R14: 0000000000000001 R15: ffff98df8112e000
[    2.692010] FS:  0000000000000000(0000) GS:ffff98e0360c0000(0000) knlGS:0000000000000000
[    2.692086] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.692152] CR2: 00007ff44f400000 CR3: 000000001e047002 CR4: 0000000000772ef0
[    2.692226] PKRU: 55555554
[    2.692283] Call Trace:
[    2.692338]  <TASK>
[    2.692400]  netdev_run_todo+0x21a/0x550
[    2.692453]  ops_undo_list+0x1e3/0x1f0
[    2.692502]  cleanup_net+0x1b7/0x2b0
[    2.692550]  process_one_work+0x162/0x380
[    2.692604]  worker_thread+0x299/0x3c0
[    2.692654]  ? rescuer_thread+0x4c0/0x4c0
[    2.692702]  kthread+0x101/0x1f0
[    2.692771]  ? kthreads_online_cpu+0x110/0x110
[    2.692851]  ? kthreads_online_cpu+0x110/0x110
[    2.692908]  ret_from_fork+0x11c/0x140
[    2.692977]  ? kthreads_online_cpu+0x110/0x110
[    2.693033]  ret_from_fork_asm+0x11/0x20
[    2.693103]  </TASK>
[    2.693142] ---[ end trace 0000000000000000 ]---
[   71.480264] ip (4681) used greatest stack depth: 12088 bytes left
[   77.043548] netem: version 1.3
[  665.325867] tc (26298) used greatest stack depth: 11864 bytes left