[    2.454474] tun: Universal TUN/TAP device driver, 1.6
[    3.575968] ------------[ cut here ]------------
[    3.576123] refcount_t: underflow; use-after-free.
[    3.576185] WARNING: CPU: 3 PID: 253 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    3.576261] Modules linked in: xt_tcpudp xt_conntrack nft_compat nf_tables x_tables nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 tun
[    3.576389] CPU: 3 UID: 0 PID: 253 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    3.576483] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.576536] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    3.576588] Code: 8d e8 18 ed b9 ff 90 0f 0b 90 90 c3 80 3d d9 ea ea 00 00 75 89 c6 05 d0 ea ea 00 01 90 48 c7 c7 78 de b1 8d e8 f5 ec b9 ff 90 <0f> 0b 90 90 c3 80 3d b4 ea ea 00 00 0f 85 62 ff ff ff c6 05 a7 ea
[    3.576724] RSP: 0018:ffffbff1c0597e50 EFLAGS: 00010286
[    3.576767] RAX: 0000000000000000 RBX: ffffbff1c0597e60 RCX: 00000000ffffdfff
[    3.576837] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    3.576907] RBP: ffffbff1c0597968 R08: ffffffff8df56d28 R09: 00000000ffffdfff
[    3.576988] R10: ffffffff8de76d40 R11: ffffffff8df26d40 R12: dead000000000122
[    3.577050] R13: 00000000fffb797c R14: 0000000000000001 R15: ffff9c8ac1f50000
[    3.577128] FS:  000000003edd83c0(0000) GS:ffff9c8b70758000(0000) knlGS:0000000000000000
[    3.577195] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.577253] CR2: 00007f4dce970000 CR3: 000000000302a005 CR4: 0000000000772ef0
[    3.577317] PKRU: 55555554
[    3.577348] Call Trace:
[    3.577371]  <TASK>
[    3.577393]  netdev_run_todo+0x21a/0x550
[    3.577441]  ? __tun_detach+0x2ed/0x490 [tun]
[    3.577510]  tun_chr_close+0x47/0xa0 [tun]
[    3.577560]  __fput+0xda/0x290
[    3.577616]  __x64_sys_close+0x3d/0x80
[    3.577652]  do_syscall_64+0xa4/0xfd0
[    3.577697]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    3.577747] RIP: 0033:0x4901eb
[    3.577793] 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
[    3.577940] RSP: 002b:00007ffda545a340 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    3.578006] RAX: ffffffffffffffda RBX: 00007ffda545a858 RCX: 00000000004901eb
[    3.578070] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000006
[    3.578145] RBP: 00007ffda545a380 R08: 0000000000000000 R09: 0000000000000000
[    3.578229] R10: 000000003ede0100 R11: 0000000000000293 R12: 00007ffda545a818
[    3.578289] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    3.578365]  </TASK>
[    3.578396] ---[ end trace 0000000000000000 ]---