[    5.225670] ------------[ cut here ]------------
[    5.225799] refcount_t: underflow; use-after-free.
[    5.225868] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    5.225944] Modules linked in:
[    5.225993] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    5.226071] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    5.226137] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    5.226192] Code: b0 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 b1 b0 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
[    5.226322] RSP: 0018:ffffb2e38059fe50 EFLAGS: 00010286
[    5.226377] RAX: 0000000000000000 RBX: ffffb2e38059fe60 RCX: 00000000ffffdfff
[    5.226453] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    5.226522] RBP: ffffb2e38059f988 R08: ffffffffb0f56a28 R09: 00000000ffffdfff
[    5.226591] R10: ffffffffb0e76a40 R11: ffffffffb0f26a40 R12: dead000000000122
[    5.226667] R13: 00000000fffb800d R14: 0000000000000001 R15: ffff9889c4d88000
[    5.226739] FS:  0000000018c113c0(0000) GS:ffff988a4d6e6000(0000) knlGS:0000000000000000
[    5.226810] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.226872] CR2: 0000559e4efc9f40 CR3: 0000000001adf002 CR4: 0000000000772ef0
[    5.226943] PKRU: 55555554
[    5.226982] Call Trace:
[    5.227024]  <TASK>
[    5.227064]  netdev_run_todo+0x21a/0x550
[    5.227117]  ? __tun_detach+0x2ed/0x490
[    5.227166]  tun_chr_close+0x47/0xa0
[    5.227215]  __fput+0xda/0x290
[    5.227267]  __x64_sys_close+0x3d/0x80
[    5.227324]  do_syscall_64+0xa4/0xfd0
[    5.227375]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    5.227435] RIP: 0033:0x4901eb
[    5.227483] 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
[    5.227619] RSP: 002b:00007fff55cb0f50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    5.227689] RAX: ffffffffffffffda RBX: 00007fff55cb14a8 RCX: 00000000004901eb
[    5.227759] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    5.227828] RBP: 00007fff55cb0f90 R08: 0000000000000000 R09: 0000000000000000
[    5.227897] R10: 0000000018c19000 R11: 0000000000000293 R12: 00007fff55cb1428
[    5.227966] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    5.228036]  </TASK>
[    5.228075] ---[ end trace 0000000000000000 ]---