[    2.074228] ------------[ cut here ]------------
[    2.074319] refcount_t: underflow; use-after-free.
[    2.074375] WARNING: CPU: 0 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.074439] Modules linked in:
[    2.074474] CPU: 0 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.074534] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.074597] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.074636] Code: b3 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 b3 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
[    2.074752] RSP: 0018:ffffc1a24053fe50 EFLAGS: 00010286
[    2.074790] RAX: 0000000000000000 RBX: ffffc1a24053fe60 RCX: 00000000ffffdfff
[    2.074845] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.074907] RBP: ffffc1a24053f988 R08: ffffffffb4156a28 R09: 00000000ffffdfff
[    2.074954] R10: ffffffffb4076a40 R11: ffffffffb4126a40 R12: dead000000000122
[    2.075006] R13: 00000000fffb73ac R14: 0000000000000001 R15: ffff9dbb454dc000
[    2.075055] FS:  00000000244c73c0(0000) GS:ffff9dbbca3e6000(0000) knlGS:0000000000000000
[    2.075117] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.075162] CR2: 00007fc0445e3000 CR3: 0000000002fd1004 CR4: 0000000000772ef0
[    2.075235] PKRU: 55555554
[    2.075260] Call Trace:
[    2.075277]  <TASK>
[    2.075298]  netdev_run_todo+0x21a/0x550
[    2.075345]  ? __tun_detach+0x2ed/0x490
[    2.075373]  tun_chr_close+0x47/0xa0
[    2.075411]  __fput+0xda/0x290
[    2.075449]  __x64_sys_close+0x3d/0x80
[    2.075477]  do_syscall_64+0xa4/0xfd0
[    2.075513]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.075552] RIP: 0033:0x4901eb
[    2.075583] 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
[    2.075699] RSP: 002b:00007ffefc435ea0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.075755] RAX: ffffffffffffffda RBX: 00007ffefc4363f8 RCX: 00000000004901eb
[    2.075803] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.075850] RBP: 00007ffefc435ee0 R08: 0000000000000000 R09: 0000000000000000
[    2.075912] R10: 0000000000000004 R11: 0000000000000293 R12: 00007ffefc436378
[    2.075960] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.076016]  </TASK>
[    2.076037] ---[ end trace 0000000000000000 ]---