[ 16.496476][ T231] ==================================================================
[ 16.496775][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 16.496985][ T231] Read of size 1 at addr ffff88800c11068c by task packetdrill/231
[ 16.497271][ T231]
[ 16.497353][ T231] CPU: 3 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.497358][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.497361][ T231] Call Trace:
[ 16.497363][ T231]
[ 16.497365][ T231] dump_stack_lvl+0x82/0xc0
[ 16.497371][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 16.497377][ T231] ? kobject_put+0xbb/0xd0
[ 16.497381][ T231] print_report+0xb4/0x270
[ 16.497385][ T231] ? kobject_put+0xbb/0xd0
[ 16.497388][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 16.497391][ T231] ? kobject_put+0xbb/0xd0
[ 16.497394][ T231] kasan_report+0xca/0x100
[ 16.497399][ T231] ? kobject_put+0xbb/0xd0
[ 16.497404][ T231] kobject_put+0xbb/0xd0
[ 16.497407][ T231] netdev_run_todo+0x5f0/0xc60
[ 16.497412][ T231] ? rtnl_is_locked+0x15/0x20
[ 16.497415][ T231] ? netif_state_change+0x228/0x2c0
[ 16.497418][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.497421][ T231] ? generic_xdp_install+0x410/0x410
[ 16.497425][ T231] ? tun_chr_close+0xae/0x1c0
[ 16.497431][ T231] tun_chr_close+0xc0/0x1c0
[ 16.497435][ T231] __fput+0x35c/0xa70
[ 16.497443][ T231] fput_close_sync+0xdd/0x1b0
[ 16.497446][ T231] ? alloc_file_clone+0xf0/0xf0
[ 16.497450][ T231] __x64_sys_close+0x7d/0xd0
[ 16.497456][ T231] do_syscall_64+0xc1/0xfd0
[ 16.497461][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.497465][ T231] RIP: 0033:0x4901eb
[ 16.497470][ T231] 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
[ 16.497473][ T231] RSP: 002b:00007ffead46f3d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.497477][ T231] RAX: ffffffffffffffda RBX: 00007ffead46f930 RCX: 00000000004901eb
[ 16.497481][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.497484][ T231] RBP: 00007ffead46f410 R08: 0000000000000000 R09: 0000000000000000
[ 16.497486][ T231] R10: 0000000000000020 R11: 0000000000000293 R12: 00007ffead46f8a8
[ 16.497488][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.497498][ T231]
[ 16.497500][ T231]
[ 16.504142][ T231] The buggy address belongs to the physical page:
[ 16.504334][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc110
[ 16.504624][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 16.504794][ T231] raw: 0080000000000000 ffffea0000139f08 ffff8880363bbc40 0000000000000000
[ 16.505092][ T231] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 16.505383][ T231] page dumped because: kasan: bad access detected
[ 16.505590][ T231]
[ 16.505672][ T231] Memory state around the buggy address:
[ 16.505825][ T231] ffff88800c110580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.506062][ T231] ffff88800c110600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.506293][ T231] >ffff88800c110680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.506534][ T231] ^
[ 16.506648][ T231] ffff88800c110700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.506872][ T231] ffff88800c110780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.507125][ T231] ==================================================================
[ 16.507385][ T231] Disabling lock debugging due to kernel taint
[ 16.507596][ T231] ------------[ cut here ]------------
[ 16.507742][ T231] refcount_t: underflow; use-after-free.
[ 16.507917][ T231] WARNING: CPU: 3 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.508220][ T231] Modules linked in:
[ 16.508345][ T231] CPU: 3 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.508711][ T231] Tainted: [B]=BAD_PAGE
[ 16.508836][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.509039][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.509253][ T231] Code: 3f 92 02 80 fb 01 0f 87 bb b9 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 5e 3f 92 02 01 90 48 c7 c7 20 8d 65 ac e8 32 bf 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 16.509820][ T231] RSP: 0018:ffffc90000b07ce8 EFLAGS: 00010282
[ 16.510026][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.510267][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.510511][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff59fe134
[ 16.510741][ T231] R10: 0000000000000003 R11: ffffc90000b07880 R12: 0000000000000001
[ 16.510982][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.511225][ T231] FS: 00000000295133c0(0000) GS:ffff888087f9a000(0000) knlGS:0000000000000000
[ 16.511513][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.511708][ T231] CR2: 00007f45ba763000 CR3: 00000000027bb003 CR4: 0000000000772ef0
[ 16.511949][ T231] PKRU: 55555554
[ 16.512068][ T231] Call Trace:
[ 16.512198][ T231]
[ 16.512277][ T231] netdev_run_todo+0x5f0/0xc60
[ 16.512541][ T231] ? rtnl_is_locked+0x15/0x20
[ 16.512697][ T231] ? netif_state_change+0x228/0x2c0
[ 16.512850][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.513053][ T231] ? generic_xdp_install+0x410/0x410
[ 16.513305][ T231] ? tun_chr_close+0xae/0x1c0
[ 16.513469][ T231] tun_chr_close+0xc0/0x1c0
[ 16.513635][ T231] __fput+0x35c/0xa70
[ 16.513764][ T231] fput_close_sync+0xdd/0x1b0
[ 16.514013][ T231] ? alloc_file_clone+0xf0/0xf0
[ 16.514171][ T231] __x64_sys_close+0x7d/0xd0
[ 16.514321][ T231] do_syscall_64+0xc1/0xfd0
[ 16.514494][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.514769][ T231] RIP: 0033:0x4901eb
[ 16.514890][ T231] 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
[ 16.515805][ T231] RSP: 002b:00007ffead46f3d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.516051][ T231] RAX: ffffffffffffffda RBX: 00007ffead46f930 RCX: 00000000004901eb
[ 16.516285][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.516538][ T231] RBP: 00007ffead46f410 R08: 0000000000000000 R09: 0000000000000000
[ 16.516763][ T231] R10: 0000000000000020 R11: 0000000000000293 R12: 00007ffead46f8a8
[ 16.516999][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.517249][ T231]
[ 16.517365][ T231] irq event stamp: 1946687
[ 16.517544][ T231] hardirqs last enabled at (1946687): [] irqentry_exit+0x3b/0x80
[ 16.517805][ T231] hardirqs last disabled at (1946686): [] handle_softirqs+0x47f/0x610
[ 16.518176][ T231] softirqs last enabled at (1946486): [] __tun_set_ebpf+0xc6/0x180
[ 16.518441][ T231] softirqs last disabled at (1946484): [] __tun_set_ebpf+0x91/0x180
[ 16.518806][ T231] ---[ end trace 0000000000000000 ]---