[    3.117341] ------------[ cut here ]------------
[    3.117484] refcount_t: underflow; use-after-free.
[    3.117551] WARNING: CPU: 3 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    3.117644] Modules linked in:
[    3.117685] CPU: 3 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    3.117784] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.117857] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    3.117914] Code: 98 e8 18 df ba ff 90 0f 0b 90 90 c3 80 3d 79 c9 eb 00 00 75 89 c6 05 70 c9 eb 00 01 90 48 c7 c7 f0 8d d1 98 e8 f5 de ba ff 90 <0f> 0b 90 90 c3 80 3d 54 c9 eb 00 00 0f 85 62 ff ff ff c6 05 47 c9
[    3.118087] RSP: 0018:ffffa967c05a7e50 EFLAGS: 00010286
[    3.118139] RAX: 0000000000000000 RBX: ffffa967c05a7e60 RCX: 00000000ffffdfff
[    3.118217] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    3.118302] RBP: ffffa967c05a7988 R08: ffffffff99156a28 R09: 00000000ffffdfff
[    3.118387] R10: ffffffff99076a40 R11: ffffffff99126a40 R12: dead000000000122
[    3.118466] R13: 00000000fffb77ce R14: 0000000000000001 R15: ffff8e2a41f18000
[    3.118555] FS:  000000000db0e3c0(0000) GS:ffff8e2ae5566000(0000) knlGS:0000000000000000
[    3.118640] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.118705] CR2: 00007fc2fe26e000 CR3: 0000000001b12001 CR4: 0000000000772ef0
[    3.118786] PKRU: 55555554
[    3.118812] Call Trace:
[    3.118839]  <TASK>
[    3.118863]  netdev_run_todo+0x21a/0x550
[    3.118912]  ? __tun_detach+0x2ed/0x490
[    3.118956]  tun_chr_close+0x47/0xa0
[    3.118997]  __fput+0xda/0x290
[    3.119044]  __x64_sys_close+0x3d/0x80
[    3.119082]  do_syscall_64+0xa4/0xfd0
[    3.119128]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    3.119186] RIP: 0033:0x4901eb
[    3.119225] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
[    3.119400] RSP: 002b:00007fff0606dce0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    3.119488] RAX: ffffffffffffffda RBX: 00007fff0606e238 RCX: 00000000004901eb
[    3.119568] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    3.119648] RBP: 00007fff0606dd20 R08: 0000000000000000 R09: 0000000000000000
[    3.119724] R10: 0000000002000000 R11: 0000000000000293 R12: 00007fff0606e1b8
[    3.119793] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    3.119872]  </TASK>
[    3.119898] ---[ end trace 0000000000000000 ]---