[    2.433947] ------------[ cut here ]------------
[    2.434039] refcount_t: underflow; use-after-free.
[    2.434103] WARNING: CPU: 0 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.434189] Modules linked in:
[    2.434225] CPU: 0 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.434314] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.434377] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.434426] Code: a1 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 a1 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
[    2.434593] RSP: 0018:ffffaebd005b7e50 EFLAGS: 00010286
[    2.434643] RAX: 0000000000000000 RBX: ffffaebd005b7e60 RCX: 00000000ffffdfff
[    2.434717] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.434791] RBP: ffffaebd005b7988 R08: ffffffffa1756a28 R09: 00000000ffffdfff
[    2.434858] R10: ffffffffa1676a40 R11: ffffffffa1726a40 R12: dead000000000122
[    2.434933] R13: 00000000fffb7523 R14: 0000000000000001 R15: ffff92b2c5da0000
[    2.435011] FS:  000000000f10d3c0(0000) GS:ffff92b35cde6000(0000) knlGS:0000000000000000
[    2.435090] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.435150] CR2: 00007f521bb9e000 CR3: 0000000005c7a006 CR4: 0000000000772ef0
[    2.435221] PKRU: 55555554
[    2.435246] Call Trace:
[    2.435271]  <TASK>
[    2.435293]  netdev_run_todo+0x21a/0x550
[    2.435340]  ? __tun_detach+0x2ed/0x490
[    2.435383]  tun_chr_close+0x47/0xa0
[    2.435419]  __fput+0xda/0x290
[    2.435464]  __x64_sys_close+0x3d/0x80
[    2.435501]  do_syscall_64+0xa4/0xfd0
[    2.435545]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.435602] RIP: 0033:0x4901eb
[    2.435647] 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
[    2.435815] RSP: 002b:00007ffda77f9e70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.435890] RAX: ffffffffffffffda RBX: 00007ffda77fa3c8 RCX: 00000000004901eb
[    2.435966] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.436040] RBP: 00007ffda77f9eb0 R08: 0000000000000000 R09: 0000000000000000
[    2.436111] R10: 0000000000000080 R11: 0000000000000293 R12: 00007ffda77fa348
[    2.436180] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.436252]  </TASK>
[    2.436275] ---[ end trace 0000000000000000 ]---