[    2.449928] ------------[ cut here ]------------
[    2.450089] refcount_t: underflow; use-after-free.
[    2.450171] WARNING: CPU: 0 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.450288] Modules linked in:
[    2.450330] CPU: 0 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.450421] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.450487] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.450544] Code: b6 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 51 b6 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
[    2.450713] RSP: 0018:ffffacc40059fe50 EFLAGS: 00010286
[    2.450760] RAX: 0000000000000000 RBX: ffffacc40059fe60 RCX: 00000000ffffdfff
[    2.450828] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.450910] RBP: ffffacc40059f988 R08: ffffffffb6956a28 R09: 00000000ffffdfff
[    2.450990] R10: ffffffffb6876a40 R11: ffffffffb6926a40 R12: dead000000000122
[    2.451057] R13: 00000000fffb7530 R14: 0000000000000001 R15: ffff9c6e83354000
[    2.451126] FS:  0000000029c843c0(0000) GS:ffff9c6f07be6000(0000) knlGS:0000000000000000
[    2.451199] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.451258] CR2: 00007fa666ea1000 CR3: 00000000059a8001 CR4: 0000000000772ef0
[    2.451317] PKRU: 55555554
[    2.451343] Call Trace:
[    2.451371]  <TASK>
[    2.451404]  netdev_run_todo+0x21a/0x550
[    2.451451]  ? __tun_detach+0x2ed/0x490
[    2.451493]  tun_chr_close+0x47/0xa0
[    2.451532]  __fput+0xda/0x290
[    2.451577]  __x64_sys_close+0x3d/0x80
[    2.451619]  do_syscall_64+0xa4/0xfd0
[    2.451665]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.451722] RIP: 0033:0x4901eb
[    2.451761] 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
[    2.451918] RSP: 002b:00007ffc76a3b6e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.451987] RAX: ffffffffffffffda RBX: 00007ffc76a3bc38 RCX: 00000000004901eb
[    2.452070] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.452131] RBP: 00007ffc76a3b720 R08: 0000000000000000 R09: 0000000000000000
[    2.452203] R10: 0000000029c8be40 R11: 0000000000000293 R12: 00007ffc76a3bbb8
[    2.452271] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.452341]  </TASK>
[    2.452366] ---[ end trace 0000000000000000 ]---