[    2.229180] ------------[ cut here ]------------
[    2.229353] refcount_t: underflow; use-after-free.
[    2.229443] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.229626] Modules linked in:
[    2.229704] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.229832] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.229951] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.230039] Code: 89 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 11 89 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
[    2.230258] RSP: 0018:ffff9d760054fe50 EFLAGS: 00010286
[    2.230347] RAX: 0000000000000000 RBX: ffff9d760054fe60 RCX: 00000000ffffdfff
[    2.230463] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.230578] RBP: ffff9d760054f988 R08: ffffffff89556a28 R09: 00000000ffffdfff
[    2.230691] R10: ffffffff89476a40 R11: ffffffff89526a40 R12: dead000000000122
[    2.230804] R13: 00000000fffb7452 R14: 0000000000000001 R15: ffff899043370000
[    2.230915] FS:  0000000029e563c0(0000) GS:ffff8990f50e6000(0000) knlGS:0000000000000000
[    2.231031] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.231138] CR2: 00007f0d1cf1d000 CR3: 0000000004b01003 CR4: 0000000000772ef0
[    2.231255] PKRU: 55555554
[    2.231291] Call Trace:
[    2.231374]  <TASK>
[    2.231436]  netdev_run_todo+0x21a/0x550
[    2.231539]  ? __tun_detach+0x2ed/0x490
[    2.231615]  tun_chr_close+0x47/0xa0
[    2.231689]  __fput+0xda/0x290
[    2.231765]  __x64_sys_close+0x3d/0x80
[    2.231839]  do_syscall_64+0xa4/0xfd0
[    2.231954]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.232044] RIP: 0033:0x4901eb
[    2.232126] 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
[    2.232340] RSP: 002b:00007fff31c9b930 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.232453] RAX: ffffffffffffffda RBX: 00007fff31c9be88 RCX: 00000000004901eb
[    2.232564] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.232674] RBP: 00007fff31c9b970 R08: 0000000000000000 R09: 0000000000000000
[    2.232785] R10: 0000000000100000 R11: 0000000000000293 R12: 00007fff31c9be08
[    2.232904] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.233015]  </TASK>
[    2.233076] ---[ end trace 0000000000000000 ]---