[ 20.408847][ T230] ==================================================================
[ 20.409236][ T230] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 20.409460][ T230] Read of size 1 at addr ffff888008ad068c by task packetdrill/230
[ 20.409701][ T230]
[ 20.409787][ T230] CPU: 2 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.409794][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.409800][ T230] Call Trace:
[ 20.409805][ T230]
[ 20.409808][ T230] dump_stack_lvl+0x82/0xc0
[ 20.409818][ T230] print_address_description.constprop.0+0x2c/0x3a0
[ 20.409829][ T230] ? kobject_put+0xbb/0xd0
[ 20.409834][ T230] print_report+0xb4/0x270
[ 20.409837][ T230] ? kobject_put+0xbb/0xd0
[ 20.409840][ T230] ? kasan_addr_to_slab+0x21/0x70
[ 20.409844][ T230] ? kobject_put+0xbb/0xd0
[ 20.409847][ T230] kasan_report+0xca/0x100
[ 20.409851][ T230] ? kobject_put+0xbb/0xd0
[ 20.409856][ T230] kobject_put+0xbb/0xd0
[ 20.409860][ T230] netdev_run_todo+0x5f0/0xc60
[ 20.409866][ T230] ? rtnl_is_locked+0x15/0x20
[ 20.409871][ T230] ? netif_state_change+0x228/0x2c0
[ 20.409874][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.409877][ T230] ? generic_xdp_install+0x410/0x410
[ 20.409881][ T230] ? tun_chr_close+0xae/0x1c0
[ 20.409888][ T230] tun_chr_close+0xc0/0x1c0
[ 20.409892][ T230] __fput+0x35c/0xa70
[ 20.409899][ T230] fput_close_sync+0xdd/0x1b0
[ 20.409902][ T230] ? alloc_file_clone+0xf0/0xf0
[ 20.409907][ T230] __x64_sys_close+0x7d/0xd0
[ 20.409910][ T230] do_syscall_64+0xc1/0xfd0
[ 20.409916][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.409927][ T230] RIP: 0033:0x4901eb
[ 20.409934][ T230] 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
[ 20.409937][ T230] RSP: 002b:00007ffe2cc5c880 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.409944][ T230] RAX: ffffffffffffffda RBX: 00007ffe2cc5cde0 RCX: 00000000004901eb
[ 20.409946][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.409948][ T230] RBP: 00007ffe2cc5c8c0 R08: 0000000000000000 R09: 0000000000000000
[ 20.409950][ T230] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffe2cc5cd58
[ 20.409952][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.409958][ T230]
[ 20.409959][ T230]
[ 20.416668][ T230] The buggy address belongs to the physical page:
[ 20.416883][ T230] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888008ad0700 pfn:0x8ad0
[ 20.417233][ T230] flags: 0x80000000000000(node=0|zone=1)
[ 20.417414][ T230] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 20.417729][ T230] raw: ffff888008ad0700 0000000000000000 00000001ffffffff 0000000000000000
[ 20.418031][ T230] page dumped because: kasan: bad access detected
[ 20.418258][ T230]
[ 20.418358][ T230] Memory state around the buggy address:
[ 20.418552][ T230] ffff888008ad0580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.418818][ T230] ffff888008ad0600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.419066][ T230] >ffff888008ad0680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.419319][ T230] ^
[ 20.419450][ T230] ffff888008ad0700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.419695][ T230] ffff888008ad0780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.419943][ T230] ==================================================================
[ 20.420410][ T230] Disabling lock debugging due to kernel taint
[ 20.420650][ T230] ------------[ cut here ]------------
[ 20.420820][ T230] refcount_t: underflow; use-after-free.
[ 20.421033][ T230] WARNING: CPU: 2 PID: 230 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.421347][ T230] Modules linked in:
[ 20.421523][ T230] CPU: 2 UID: 0 PID: 230 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.421910][ T230] Tainted: [B]=BAD_PAGE
[ 20.422069][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.422304][ T230] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.422541][ T230] 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 e5 b1 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
[ 20.423123][ T230] RSP: 0018:ffffc90000aa7ce8 EFLAGS: 00010282
[ 20.423373][ T230] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.423659][ T230] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.423920][ T230] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff64fe134
[ 20.424184][ T230] R10: 0000000000000003 R11: ffffc90000aa7880 R12: 0000000000000001
[ 20.424444][ T230] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.424697][ T230] FS: 000000000b4af3c0(0000) GS:ffff88808271a000(0000) knlGS:0000000000000000
[ 20.424990][ T230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.425216][ T230] CR2: 00007fbd8ca0a000 CR3: 000000000bb5e001 CR4: 0000000000772ef0
[ 20.425497][ T230] PKRU: 55555554
[ 20.425641][ T230] Call Trace:
[ 20.425785][ T230]
[ 20.425888][ T230] netdev_run_todo+0x5f0/0xc60
[ 20.426071][ T230] ? rtnl_is_locked+0x15/0x20
[ 20.426260][ T230] ? netif_state_change+0x228/0x2c0
[ 20.426440][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.426649][ T230] ? generic_xdp_install+0x410/0x410
[ 20.426842][ T230] ? tun_chr_close+0xae/0x1c0
[ 20.427207][ T230] tun_chr_close+0xc0/0x1c0
[ 20.427416][ T230] __fput+0x35c/0xa70
[ 20.427568][ T230] fput_close_sync+0xdd/0x1b0
[ 20.427792][ T230] ? alloc_file_clone+0xf0/0xf0
[ 20.427988][ T230] __x64_sys_close+0x7d/0xd0
[ 20.428175][ T230] do_syscall_64+0xc1/0xfd0
[ 20.428362][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.428600][ T230] RIP: 0033:0x4901eb
[ 20.428773][ T230] 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
[ 20.429394][ T230] RSP: 002b:00007ffe2cc5c880 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.429672][ T230] RAX: ffffffffffffffda RBX: 00007ffe2cc5cde0 RCX: 00000000004901eb
[ 20.429951][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.430209][ T230] RBP: 00007ffe2cc5c8c0 R08: 0000000000000000 R09: 0000000000000000
[ 20.430496][ T230] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffe2cc5cd58
[ 20.430767][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.431038][ T230]
[ 20.431193][ T230] irq event stamp: 1857103
[ 20.431378][ T230] hardirqs last enabled at (1857103): [] irqentry_exit+0x3b/0x80
[ 20.431701][ T230] hardirqs last disabled at (1857102): [] handle_softirqs+0x47f/0x610
[ 20.432048][ T230] softirqs last enabled at (1856914): [] __tun_set_ebpf+0xc6/0x180
[ 20.432353][ T230] softirqs last disabled at (1856912): [] __tun_set_ebpf+0x91/0x180
[ 20.432669][ T230] ---[ end trace 0000000000000000 ]---