[    5.617728] ------------[ cut here ]------------
[    5.617901] refcount_t: underflow; use-after-free.
[    5.617998] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    5.618119] Modules linked in:
[    5.618183] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    5.618290] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    5.618376] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    5.618464] Code: aa 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 31 aa 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
[    5.618624] RSP: 0018:ffffbb88c05a7e50 EFLAGS: 00010286
[    5.618752] RAX: 0000000000000000 RBX: ffffbb88c05a7e60 RCX: 00000000ffffdfff
[    5.618843] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    5.618952] RBP: ffffbb88c05a7988 R08: ffffffffaa756a28 R09: 00000000ffffdfff
[    5.619044] R10: ffffffffaa676a40 R11: ffffffffaa726a40 R12: dead000000000122
[    5.619147] R13: 00000000fffb818f R14: 0000000000000001 R15: ffff9bc6c48cc000
[    5.619256] FS:  00000000171e53c0(0000) GS:ffff9bc753ee6000(0000) knlGS:0000000000000000
[    5.619369] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.619481] CR2: 000055def73cb028 CR3: 0000000004a6d002 CR4: 0000000000772ef0
[    5.619578] PKRU: 55555554
[    5.619651] Call Trace:
[    5.619725]  <TASK>
[    5.619801]  netdev_run_todo+0x21a/0x550
[    5.619899]  ? __tun_detach+0x2ed/0x490
[    5.619974]  tun_chr_close+0x47/0xa0
[    5.620043]  __fput+0xda/0x290
[    5.620114]  __x64_sys_close+0x3d/0x80
[    5.620177]  do_syscall_64+0xa4/0xfd0
[    5.620251]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    5.620328] RIP: 0033:0x4901eb
[    5.620391] 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
[    5.620562] RSP: 002b:00007ffdd288ab00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    5.620662] RAX: ffffffffffffffda RBX: 00007ffdd288b058 RCX: 00000000004901eb
[    5.620765] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    5.620858] RBP: 00007ffdd288ab40 R08: 0000000000000000 R09: 0000000000000000
[    5.620955] R10: 00000000171ed000 R11: 0000000000000293 R12: 00007ffdd288afd8
[    5.621081] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    5.621181]  </TASK>
[    5.621238] ---[ end trace 0000000000000000 ]---